Ból ucha – Patofizjologia i mechanizm

Ból ucha
Patofizjologia i mechanizm

Otalgia dzieli się na pierwotną, wynikającą bezpośrednio z patologii ucha, oraz wtórną, będącą bólem odniesionym z innych obszarów unerwionych wspólnymi nerwami czaszkowymi (V, VII, IX, X) i rdzeniowymi (C2, C3). W otalgii pierwotnej najczęstszą przyczyną jest infekcja lub stan zapalny ucha środkowego i zewnętrznego. Dysfunkcja trąbki Eustachiusza prowadzi do zaburzeń wyrównania ciśnienia i gromadzenia płynu w uchu środkowym, co sprzyja rozwojowi ostrego zapalenia ucha środkowego (AOM) z charakterystycznym wzrostem ciśnienia i wybrzuszeniem błony bębenkowej. Zapalenie ucha zewnętrznego (otitis externa) jest najczęściej bakteryjne, z dominacją Pseudomonas aeruginosa (~40%), S. epidermidis, S. aureus i beztlenowców, a czynniki ryzyka obejmują wilgoć, uszkodzenia skóry przewodu słuchowego i ekspozycję na zanieczyszczoną wodę. U pacjentów z obniżoną odpornością, zwłaszcza u diabetyków, może rozwinąć się złośliwe zapalenie ucha zewnętrznego z zajęciem kości czaszki.

Patofizjologia bólu ucha – podstawowe mechanizmy

Mechanizm bólu pierwotnego
Mechanizm bólu wtórnego

Patogeneza zapalenia ucha środkowego

Rola zaburzeń drożności trąbki Eustachiusza
Rola wirusów i bakterii w zapaleniu ucha środkowego
Rola biofilmów bakteryjnych

Patogeneza zapalenia ucha zewnętrznego

Mechanizmy patogenetyczne zapalenia ucha zewnętrznego
Złośliwe zapalenie ucha zewnętrznego

Powikłania zapalenia ucha

Utrata słuchu
Rozprzestrzenianie się infekcji

Czynniki predysponujące do bólu ucha

Czynniki anatomiczne i rozwojowe
Czynniki środowiskowe i zakaźne
Czynniki genetyczne i immunologiczne

Podsumowanie mechanizmów patogenetycznych bólu ucha

Kolejne rozdziały

Patofizjologia bólu ucha – podstawowe mechanizmy

Ból ucha (otalgia) to złożony objaw, który można podzielić na dwa podstawowe typy: otalgię pierwotną i wtórną. Otalgia pierwotna wynika bezpośrednio z patologii ucha, podczas gdy otalgia wtórna jest bólem odnoszonym z innych miejsc, które dzielą unerwienie z uchem. Zrozumienie złożonej sieci nerwowej odpowiedzialnej za unerwienie czuciowe ucha jest kluczowe dla właściwej diagnostyki i leczenia bólu ucha.¹²

Unerwienie czuciowe ucha jest zapewniane przez kilka nerwów czaszkowych i rdzeniowych, co tłumaczy różnorodność potencjalnych przyczyn bólu ucha. Małżowina uszna jest unerwiana przez nerwy czaszkowe V, VII, X oraz nerwy rdzeniowe C2 i C3. Zewnętrzny przewód słuchowy i kanał unerwiony jest przez nerwy czaszkowe V, VII i X. Błona bębenkowa otrzymuje włókna czuciowe z nerwów czaszkowych VII, IX i X, a ucho środkowe z nerwów V, VII i IX. Podrażnienie którejkolwiek części tych nerwów może wywołać ból ucha.³⁴

Mechanizm bólu pierwotnego

Ból pierwotny ucha najczęściej wynika z infekcji lub stanu zapalnego struktur ucha. W przypadku ucha środkowego, ból może być spowodowany gradientem ciśnienia między uchem środkowym a otoczeniem zewnętrznym, miejscowym stanem zapalnym lub kombinacją obu tych czynników. Gradient ciśnienia w uchu środkowym zazwyczaj wiąże się z dysfunkcją trąbki Eustachiusza, która uniemożliwia wyrównanie ciśnienia między uchem środkowym a ciśnieniem atmosferycznym, a także prowadzi do gromadzenia się płynu w uchu środkowym.⁵

Zapalenie ucha środkowego (otitis media) powoduje bolesny stan zapalny błony bębenkowej, a także ból spowodowany zwiększonym ciśnieniem w uchu środkowym, co prowadzi do wybrzuszenia błony bębenkowej. Zwiększone ciśnienie może wynikać z nagromadzenia ropy, co jest szczególnie charakterystyczne dla ostrego zapalenia ucha środkowego. W przypadku ostrego zapalenia ucha zewnętrznego (otitis externa), zakażenie i stan zapalny skóry przewodu słuchowego zewnętrznego są bezpośrednią przyczyną bólu.⁶⁷

Mechanizm bólu wtórnego

Ból wtórny ucha (otalgia odniesiona) jest bólem odczuwanym w uchu, ale pochodzącym z innego miejsca. Wynika to z faktu, że nerwy unerwione ucho również unerwią inne struktury głowy, szyi, a nawet klatki piersiowej i jamy brzusznej. Drażnienie tych nerwów w innej części ciała może wywołać ból odniesiony do ucha.⁸

Najbardziej akceptowaną teorią wyjaśniającą mechanizm bólu odniesionego jest teoria konwergencji-projekcji, która zakłada, że wiele nerwów zbiega się na jednej wspólnej drodze nerwowej, a ośrodkowy układ nerwowy nie jest w stanie rozróżnić miejsca pochodzenia bodźca. W otalgii wtórnej dochodzi do zbieżności wspólnych dróg czuciowych między złożonym unerwieniem czuciowym ucha a nerwami czaszkowych unerwiejącymi głowę i szyję, przy czym ośrodkowy układ nerwowy nie jest w stanie prawidłowo zlokalizować miejsca patologii.⁹

Podrażnienie nerwu trójdzielnego (nerw czaszkowy V) jest najczęstszą przyczyną otalgii odniesionej, wynikającą z zaburzeń stawu skroniowo-żuchwowego, infekcji zębów, neuralgii trójdzielnej, zapalenia zatok i innych stanów w obszarze unerwianym przez ten nerw.¹⁰¹¹

Patogeneza zapalenia ucha środkowego

Zapalenie ucha środkowego (otitis media) jest jedną z najczęstszych przyczyn bólu ucha, zwłaszcza u dzieci. Patogeneza tego schorzenia jest złożona i obejmuje interakcje między czynnikami anatomicznymi, infekcyjnymi i immunologicznymi.¹²

Rola zaburzeń drożności trąbki Eustachiusza

Najważniejszym czynnikiem w patogenezie choroby ucha środkowego jest dysfunkcja trąbki Eustachiusza (ETD). Trąbka Eustachiusza łączy ucho środkowe z nosogardłem i pełni kluczową rolę w drenażu płynu z ucha środkowego oraz wyrównywaniu ciśnienia między uchem środkowym a otoczeniem zewnętrznym. Zakłócenie funkcjonowania trąbki Eustachiusza, spowodowane obrzękiem, guzem lub ujemnym ciśnieniem wewnątrzbębenkowym, ułatwia bezpośrednie rozprzestrzenianie się procesów zakaźnych z nosogardła do ucha środkowego, powodując zapalenie ucha środkowego.¹³

U dzieci czynniki rozwojowe, takie jak krótka, szeroka i bardziej pozioma trąbka Eustachiusza, niedojrzały układ odpornościowy oraz częste infekcje górnych dróg oddechowych, odgrywają główną rolę w rozwoju ostrego zapalenia ucha środkowego. Badania wykazały, że infekcja wirusowa nabłonka górnych dróg oddechowych prowadzi do zwiększonej dysfunkcji trąbki Eustachiusza i zwiększonej kolonizacji i przyczepności bakterii w nosogardła.¹⁴¹⁵

Rola wirusów i bakterii w zapaleniu ucha środkowego

Zakażenie wirusowe jest niezbędne dla początkowego rozwoju bakteryjnego ostrego zapalenia ucha środkowego (AOM). Niedawne badania wykazały, że sama obecność wirusów oddechowych w nosogardła nie wystarczy do rozwoju AOM; replikacja wirusa i objawy ze strony układu oddechowego spowodowane infekcją wirusową są również konieczne.¹⁶

Wymaganie obecności procesu zapalnego zostało wykazane w modelu chomika AOM, gdzie chomiki zarażone Streptococcus pneumoniae i trzema różnymi adenowirusami. Zakażenie dzikim typem adenowirusa lub adenowirusem hiperzapalnym zwiększało proporcję uszu zidentyfikowanych jako dodatnich w hodowli S. pneumoniae w porównaniu ze zwierzętami zarażonymi samymi bakteriami. Jednakże zakażenie niereplikującym się adenowirusem nie zwiększało występowania bakteryjnego AOM.¹⁷

Pewne infekcje wirusowe powodują nieprawidłowe reakcje odpornościowe i zapalne gospodarza w błonie śluzowej trąbki Eustachiusza i następczą inwazję drobnoustrojów do ucha środkowego. Odpowiedź immunologiczna i zapalna gospodarza na inwazję bakteryjną ucha środkowego prowadzi do gromadzenia się płynu w uchu środkowym i objawów ostrego zapalenia ucha środkowego.¹⁸

Chociaż interakcje między powszechnymi bakteriami patogennymi w AOM a niektórymi wirusami nie są w pełni zrozumiane, istnieją silne dowody na to, że interakcje te często prowadzą do cięższej choroby, zmniejszonej odpowiedzi na terapię przeciwdrobnoustrojową i rozwoju wysiękowego zapalenia ucha środkowego (OME) po AOM.¹⁹

Rola biofilmów bakteryjnych

Biofilmy są tworzone przez prawie wszystkie gatunki bakterii i zapewniają wiele korzyści ochronnych, które obejmują oporność na leczenie przeciwdrobnoustrojowe i efektory odporności wrodzonej. Wykazano, że patogeny ucha organizują się w biofilmy w nosogardła i uchu środkowym, co jest ważne w przetrwaniu choroby i jej przewlekłości. Znaczenie tworzenia biofilmu dla patogenu jest zilustrowane przez produkcję in vivo cząsteczek, takich jak autoinduktory, które promują tworzenie biofilmu, zapobiegają rozpraszaniu i zwiększają przetrwanie.²⁰

Patogeneza zapalenia ucha zewnętrznego

Zapalenie ucha zewnętrznego (otitis externa), znane również jako ucho pływaka, jest infekcją przewodu słuchowego zewnętrznego, która najczęściej jest spowodowana przez bakterie, choć może być również wywołana przez wirusy lub grzyby.²¹

Mechanizmy patogenetyczne zapalenia ucha zewnętrznego

Wystąpienie zapalenia ucha zewnętrznego oznacza, że naturalne mechanizmy obronne ucha nie zadziałały prawidłowo. Warunki, które często odgrywają rolę w infekcji, obejmują: wilgoć w przewodzie słuchowym, która stwarza idealne miejsce do namnażania się bakterii, kontakt z zanieczyszczoną wodą oraz uszkodzenie skóry przewodu słuchowego, które może być punktem wejścia dla bakterii.²²

Skóra przewodu słuchowego zewnętrznego jest normalnie chroniona przez woskowatą, wodoodporną powłokę. Bakterie żyjące na powierzchni skóry mogą powodować zapalenie ucha zewnętrznego, gdy dochodzi do przerwania bariery skórnej. Uraz skóry przewodu słuchowego spowodowany patyczkami kosmetycznymi lub paznokciami może spowodować przerwanie bariery. Osoby, które często pływają, są również predysponowane do infekcji ucha zewnętrznego. Długotrwała ekspozycja na wilgoć powoduje, że wodoodporna powłoka i skóra stają się miękkie, co umożliwia bakteriom zakażenie skóry.²³

Każde przerwanie w tworzeniu woskowiny (np. powtarzająca się ekspozycja na wodę), uraz kanału (np. patyczki do uszu) lub niedrożność (np. zanieczyszczenia) mogą zakłócić mechanizmy ochronne zewnętrznego przewodu słuchowego i prowadzić do nadmiernego wzrostu patogenów i stanu zapalnego. Skóra staje się zaczerwieniona, opuchnięta, tkliwa i ciepła, prowadząc do gromadzenia się zanieczyszczeń i wydzieliny. Zwężenie kanału, w połączeniu z nagromadzeniem zanieczyszczeń, prowadzi do dalszego uwięzienia patogenów i nasilenia procesu zakaźnego.²⁴

Najczęstszymi patogenami odpowiedzialnymi za zapalenie ucha zewnętrznego są Pseudomonas Aeruginosa (około 40%), S. Epidermidis, S. Aureus i beztlenowce. W rzadszych przypadkach może być spowodowane infekcją grzybiczą (typowo Aspergillus spp. lub Candida).²⁵

Złośliwe zapalenie ucha zewnętrznego

Złośliwe zapalenie ucha zewnętrznego to rozszerzenie zapalenia ucha zewnętrznego na kości wyrostka sutkowatego i skroniowej, powodujące zapalenie kości podstawy czaszki. Typowo występuje u starszych, diabetyków lub pacjentów z obniżoną odpornością. Diabetycy są bardziej narażeni z powodu słabej odporności. Są również bardziej podatni na agresywną formę infekcji zwaną złośliwym zapaleniem ucha zewnętrznego, w której infekcja obejmuje kości czaszki.²⁶²⁷

Powikłania zapalenia ucha

Chociaż większość infekcji ucha nie powoduje długotrwałych powikłań, infekcje ucha, które występują wielokrotnie lub utrzymują się przez dłuższy czas, mogą prowadzić do poważnych komplikacji.²⁸

Utrata słuchu

Łagodna utrata słuchu jest powszechna w przypadku infekcji ucha. Ale słuch zwykle poprawia się po ustąpieniu infekcji. Infekcje ucha, które powtarzają się wielokrotnie, lub stały płyn w uchu środkowym mogą powodować większą utratę słuchu. Jeśli dojdzie do trwałego uszkodzenia błony bębenkowej lub innych części ucha środkowego, słuch może się nie poprawić.²⁹

Zmienna utrata słuchu typu przewodzeniowego występuje prawie zawsze we wszystkich typach zapalenia ucha środkowego. W rzeczywistości jest to najczęstsza przyczyna utraty słuchu u małych dzieci. Trzy małe kości w uchu środkowym przenoszą drgania dźwiękowe z błony bębenkowej do ucha wewnętrznego. Gdy płyn jest obecny, drgania nie są przenoszone efektywnie i energia dźwiękowa jest tracona. Wynikiem może być łagodna lub nawet umiarkowana utrata słuchu. W związku z tym dźwięki mowy są stłumione lub niesłyszalne.³⁰

Ogólnie rzecz biorąc, ten rodzaj utraty słuchu jest przewodzeniowy i jest tymczasowy. Jednak gdy zapalenie ucha środkowego pojawia się wielokrotnie, może dojść do uszkodzenia błony bębenkowej, kości ucha, a nawet nerwu słuchowego, co może prowadzić do trwałej, odbiorczej utraty słuchu.³¹

Rozprzestrzenianie się infekcji

Nieleczone infekcje lub infekcje, które nie reagują dobrze na leczenie, mogą rozprzestrzeniać się na pobliskie tkanki. Rzadko infekcja ucha może powodować infekcję kości wyrostka sutkowatego za uchem, znaną jako zapalenie wyrostka sutkowatego. Ta infekcja może uszkodzić kość i powodować powstawanie torbieli wypełnionych ropą.³²

Również rzadko poważne infekcje ucha środkowego mogą rozprzestrzeniać się na inne tkanki w głowie. Może to prowadzić do infekcji mózgu lub błon otaczających mózg, znanej jako zapalenie opon mózgowych.³³

Najgroźniejszym powikłaniem zapalenia ucha środkowego jest ropień mózgu, gromadzenie się ropy w mózgu z powodu infekcji. Inne powikłania obejmują bakteryjne zapalenie opon mózgowych, którego objawy to silny ból głowy, wysoka gorączka, sztywność karku, drażliwość, zmieniony stan psychiczny i złe samopoczucie.³⁴

Czynniki predysponujące do bólu ucha

Istnieje wiele czynników, które mogą zwiększać ryzyko rozwoju infekcji ucha i związanego z nim bólu.

Czynniki anatomiczne i rozwojowe

U dzieci rozwojowe zmiany trąbki Eustachiusza, niedojrzały układ odpornościowy i częste infekcje błony śluzowej górnych dróg oddechowych odgrywają główną rolę w rozwoju AOM. Dzieci są predysponowane do AOM, ponieważ częściej niż dorośli nabywają infekcje wirusowe, a ich trąbki Eustachiusza są również krótsze i bardziej poziome w porównaniu z dorosłymi.³⁵³⁶

Trąbki Eustachiusza małych dzieci są często bardzo miękkie i mają trudności z pozostawaniem otwartymi. Alergie, spływ błony śluzowej, infekcje zatok, powszechne wirusy przeziębienia i problemy z migdałkami mogą utrudniać przepływ wystarczającej ilości powietrza do ucha środkowego.³⁷

Migdałki znajdują się bardzo blisko końca trąbki Eustachiusza i są skupiskami komórek, które zwalczają infekcje, podobnie jak migdałki. Migdałki mogą czasami przechwytywać bakterie, co może prowadzić do infekcji i stanu zapalnego trąbek Eustachiusza i ucha środkowego.³⁸

Czynniki środowiskowe i zakaźne

Najczęstszym czynnikiem wyzwalającym infekcję ucha u dzieci jest infekcja górnych dróg oddechowych, taka jak przeziębienie lub grypa. Te wirusy mogą powodować opuchnięcie trąbki Eustachiusza, uniemożliwiając przepływ powietrza do ucha środkowego. Alergie na pyłki, kurz, sierść zwierząt lub żywność mogą mieć taki sam efekt. Podobnie dym, opary i inne toksyny środowiskowe.³⁹

Bakterie mogą powodować infekcję ucha, ale zwykle te zarazki pojawiają się po wirusie lub reakcji alergicznej. Bakterie mogą zainfekować już zainfekowane ucho i powodować inne objawy, takie jak gorączka.⁴⁰

Dym z tytoniu, bierne palenie i głęboka ekspozycja na dym w powietrzu mogą również zwiększać ryzyko infekcji ucha. Wyściółka nosa i ucha ma szczególny rodzaj mechanizmu oczyszczającego, który jest bardzo podatny na działanie zewnętrznych czynników drażniących.⁴¹

Czynniki genetyczne i immunologiczne

Niewielka część dzieci ma niższe poziomy wydzielniczej immunoglobuliny A lub utrzymujące się biofilmy w uchu środkowym, co może odgrywać rolę w zwiększaniu ryzyka nawracającego AOM. Indywidualna podatność na ekspozycję na hałas różni się znacznie i może być genetyczna.⁴²⁴³

Niektóre badania wykazały, że osoby z chorobą Menièreʼa mogą mieć nagromadzenie płynu w ślimaku i narządach przedsionkowych w uchu. Dokładny powód tego zatrzymywania płynu jest nieznany.⁴⁴

Podsumowanie mechanizmów patogenetycznych bólu ucha

Ból ucha może być spowodowany wieloma różnymi mechanizmami patogenetycznymi, które można sklasyfikować jako pierwotne (pochodzące z samego ucha) lub wtórne (odniesione z innych miejsc). Zrozumienie tych mechanizmów jest kluczowe dla właściwej diagnostyki i skutecznego leczenia bólu ucha.⁴⁵

W otalgii pierwotnej głównym mechanizmem jest infekcja lub stan zapalny struktur ucha, takich jak zapalenie ucha środkowego lub zapalenie ucha zewnętrznego. W zapaleniu ucha środkowego dysfunkcja trąbki Eustachiusza prowadzi do gromadzenia się płynu, zwiększonego ciśnienia i stanu zapalnego w uchu środkowym. Natomiast w zapaleniu ucha zewnętrznego naruszenie bariery skórnej przewodu słuchowego zewnętrznego umożliwia bakteriom inwazję i infekcję.⁴⁶

W otalgii wtórnej ból jest odnoszony do ucha przez wspólne drogi nerwowe. Zgodnie z teorią konwergencji-projekcji, kiedy nerwy zaopatrujące ucho i inne struktury zbiegają się na wspólnych drogach nerwowych, ośrodkowy układ nerwowy może interpretować ból pochodzący z tych innych struktur jako pochodzący z ucha.⁴⁷

Właściwe zrozumienie tych mechanizmów patogenetycznych bólu ucha pozwala na dokładniejszą diagnozę i skuteczniejsze leczenie, co jest szczególnie ważne w przypadku bólu odniesionego, który może wymagać leczenia przyczyny pierwotnej, a nie samego ucha.⁴⁸

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Materiały źródłowe

#1 Otalgia – StatPearls – NCBI Bookshelf
https://www.ncbi.nlm.nih.gov/books/NBK549830/
Otalgia or ear pain is a multifaceted condition categorized into primary and secondary otalgia. Primary otalgia originates directly from an ear pathology, while secondary otalgia results from referred pain from extraneous sources. […] Understanding the relevant neural connections is pivotal for diagnostic accuracy and management effectiveness. […] The activity underscores the collaborative role of the interprofessional team in diagnosing and managing otalgia, considering the diverse neural pathways involved in this intricate sensory experience. […] Understanding the innervation patterns of these nerves helps in the differential diagnosis of otalgia and determining whether the pain originates from the ear itself or is referred from nearby structures. Accurate diagnosis based on the underlying etiology is essential for appropriate management and ear pain resolution.
#2 Otalgia: Practice Essentials, Pathophysiology, Epidemiology
https://emedicine.medscape.com/article/845173-overview
Otalgia is defined as ear pain. Two separate and distinct types of otalgia exist. Pain that originates within the ear is primary otalgia; pain that originates outside the ear is referred otalgia. […] Typical sources of primary otalgia are external otitis, otitis media, mastoiditis, and auricular infections. […] Referred otalgia is a topic unto itself. Although many entities can cause referred otalgia, their relationship to ear pain must be identified. […] Reports document that not all otalgia originates from the ear. Many remote anatomic sites share dual innervation with the ear, and noxious stimuli to these areas may be perceived as otogenic pain. By definition, referred otalgia is the sensation of ear pain originating from a source outside the ear. […] To better understand referred otalgia, the physician first must understand the anatomic distribution of nerves associated with the ear. Irritation of these nerves, as well as irritation of distant branches of these nerves, can cause the perception of pain within the ear.
#3 Ear Pain: Diagnosing Common and Uncommon Causes | AAFP
https://www.aafp.org/pubs/afp/issues/2018/0101/p20.html
Otalgia (ear pain) is a common presentation in the primary care setting with many diverse causes. Pain that originates from the ear is called primary otalgia, and the most common causes are otitis media and otitis externa. […] The etiology of primary otalgia, which is usually identified on examination of the ear, is typically otitis externa or otitis media. […] The etiology of secondary otalgia is more complex because the nerves innervating the ear have a shared distribution to include the head, neck, chest, and abdomen. […] The ear is innervated by several sensory nerves. The auricle is affected by cranial nerves V, VII, X, C2, and C3; the external auditory meatus and canal by cranial nerves V, VII, and X; the tympanic membrane by cranial nerves VII, IX, and X; and the middle ear by cranial nerves V, VII, and IX. Irritation of any portion of these nerves can result in otalgia.
#4 Otalgia: Practice Essentials, Pathophysiology, Epidemiology
https://emedicine.medscape.com/article/845173-overview
The sensory innervation of the ear is served by the auriculotemporal branch of the fifth cranial nerve (CN V), the first and second cervical nerves, the Jacobson branch of the glossopharyngeal nerve, the Arnold branch of the vagus nerve, and the Ramsey Hunt branch of the facial nerve. Neuroanatomically, the sensation of otalgia is thought to center in the spinal tract nucleus of CN V. Not surprisingly, fibers from CNs V, VII, IX, and X and cervical nerves 1, 2, and 3 have been found to enter this spinal tract nucleus caudally near the medulla. Hence, noxious stimulation of any branch of the aforementioned nerves may be interpreted as otalgia.
#5 Otalgia – Ear, Nose, and Throat Disorders – MSD Manual Professional Edition
https://www.msdmanuals.com/professional/ear,-nose,-and-throat-disorders/approach-to-the-patient-with-ear-problems/earache
Ear pain may come from a process within the ear itself or may be referred to the ear from a nearby nonotologic source. […] Pain from the ear itself may result from a pressure gradient between the middle ear and outside air, from local inflammation, or both. A middle ear pressure gradient usually involves eustachian tube obstruction, which inhibits equilibration between middle ear pressure and atmospheric pressure and also allows fluid to accumulate in the middle ear. Otitis media causes painful inflammation of the tympanic membrane as well as pain from increased middle ear pressure (causing bulging of the tympanic membrane). […] Referred pain can result from disorders in areas innervated by cranial nerves responsible for sensation in the external and middle ear (5th, 9th, and 10th nerves).
#6 Otalgia – Ear, Nose, and Throat Disorders – MSD Manual Professional Edition
https://www.msdmanuals.com/professional/ear,-nose,-and-throat-disorders/approach-to-the-patient-with-ear-problems/earache
Ear pain may come from a process within the ear itself or may be referred to the ear from a nearby nonotologic source. […] Pain from the ear itself may result from a pressure gradient between the middle ear and outside air, from local inflammation, or both. A middle ear pressure gradient usually involves eustachian tube obstruction, which inhibits equilibration between middle ear pressure and atmospheric pressure and also allows fluid to accumulate in the middle ear. Otitis media causes painful inflammation of the tympanic membrane as well as pain from increased middle ear pressure (causing bulging of the tympanic membrane). […] Referred pain can result from disorders in areas innervated by cranial nerves responsible for sensation in the external and middle ear (5th, 9th, and 10th nerves).
#7 Otalgia | Treatment & Management | Point of Care
https://www.statpearls.com/point-of-care/26421
Primary otalgia stems most commonly from infection. AOM is the most frequent primary otalgia cause in children. The disease is typically associated with an upper respiratory tract infection that causes eustachian tube congestion and swelling. Eustachian tube swelling at this location can impede or prevent middle ear drainage. Collected middle ear secretions, known as an effusion, may lead to conductive hearing loss and potential bacterial growth, resulting in acute infection and pain. […] Chronic suppurative otitis media is the most common primary cause of otalgia in adults. The condition is a complication of eustachian tube dysfunction, similar to AOM. However, chronic suppurative otitis media is more likely to be a long-term problem requiring surgical management. […] Secondary or referred otalgia occurs due to the ear’s complex sensory nerve network. This nerve network also provides innervation to structures in the head and neck and distant sites, predisposing to referred pain when neurally connected distant sites are injured or inflamed. One theoretical mechanism of referred otalgia is the convergence-projection theory, which states that these nerves converge onto a shared neural pathway. Given the plethora of organs sharing the ear’s innervation pathways, secondary otalgia can arise from many locations.
#8 Ear pain – Wikipedia
https://en.wikipedia.org/wiki/Ear_pain
Many different nerves provide sensation to the various parts of the ear, including cranial nerves V (trigeminal), VII (facial), IX (glossopharyngeal), and X (vagus), and the great auricular nerve (cervical nerves C2-C3). These nerves also supply other parts of the body, from the mouth to the chest and abdomen. Irritation of these nerves in another part of the body has the potential to produce pain in the ear. This is called referred pain. Irritation of the trigeminal nerve (cranial nerve V) is the most common cause of referred ear pain.
#9 The Radiology of Referred Otalgia | American Journal of Neuroradiology
http://www.ajnr.org/content/30/10/1817
Pain referred to the ear is a well-documented phenomenon, which can be due to a multitude of disease processes. […] Essentially any pathology residing within the sensory net of cranial nerves V, VII, IX, and X and the upper cervical nerves C2 and C3 can potentially cause referred otalgia. […] Although the mechanism of referred otalgia is slightly controversial, the most accepted theory is the convergence-projection theory, which states that multiple nerves converge onto a single shared neural pathway, with the central nervous system (CNS) unable to differentiate the origin of stimulation. […] In referred otalgia, there is a convergence of common sensory pathways between the complex sensory innervation supplying both the ear and cranial nerves innervating the head and neck, with the CNS unable to correctly pinpoint the location of pathology. […] This sensory error is analogous to a patient’s having pain in the medial left arm when experiencing an acute coronary syndrome or patient’s feeling pain in the shoulder when, in actuality, a lesion is irritating the patient’s diaphragm.
#10 Ear Pain: Diagnosing Common and Uncommon Causes | AAFP
https://www.aafp.org/pubs/afp/issues/2018/0101/p20.html
The complex embryologic development of the ear results in neural connections to several cranial and cervical nerves. These nerves provide sensory innervation to regions of the head, neck, chest, and abdomen, which can result in referred pain to the ear. […] Referred pain from the trigeminal nerve (cranial nerve V) is the most common source of secondary otalgia stemming from TMJ syndrome, dental infections, trigeminal neuralgia, sinusitis, and mandibular osteomyelitis or tumor. […] Secondary otalgia can be caused by irritation of C2 and C3 cervical nerve roots, especially in patients with cervical spine degeneration. […] Tumor, infection, or an inflammatory process within the sensory distribution of any of these nerves may cause referred pain to the ear.
#11 Ear pain – Wikipedia
https://en.wikipedia.org/wiki/Ear_pain
Many different nerves provide sensation to the various parts of the ear, including cranial nerves V (trigeminal), VII (facial), IX (glossopharyngeal), and X (vagus), and the great auricular nerve (cervical nerves C2-C3). These nerves also supply other parts of the body, from the mouth to the chest and abdomen. Irritation of these nerves in another part of the body has the potential to produce pain in the ear. This is called referred pain. Irritation of the trigeminal nerve (cranial nerve V) is the most common cause of referred ear pain.
#12 Ear infection (middle ear) – Symptoms & causes – Mayo Clinic
https://www.mayoclinic.org/diseases-conditions/ear-infections/symptoms-causes/syc-20351616
An ear infection, also known as acute otitis media, is an infection of the air-filled space behind the eardrum, known as the middle ear. […] A bacterium or virus in the middle ear causes an ear infection. This infection often comes from another illness, such as a cold, flu or allergy. These can cause the inside the nose, throat and ears to be swollen and stuffy. […] In an ear infection, narrow tubes that run from the middle ear to high in the back of the throat, also known as eustachian tubes, can become swollen and blocked. This can lead to mucus buildup in the middle ear. This mucus can become infected and cause ear infection symptoms. […] Swollen eustachian tubes can become blocked, causing fluids to build up in the middle ear. This fluid can become infected and cause the symptoms of an ear infection.
#13 Otitis Media: Practice Essentials, Background, Pathophysiology
https://emedicine.medscape.com/article/994656-overview
Otitis media (OM) is any inflammation of the middle ear, without reference to etiology or pathogenesis. It can be classified into many variants on the basis of etiology, duration, symptomatology, and physical findings. […] The most important factor in middle ear disease is eustachian tube (ET) dysfunction (ETD), in which the mucosa at the pharyngeal end of the ET is part of the mucociliary system of the middle ear. Interference with this mucosa by edema, tumor, or negative intratympanic pressure facilitates direct extension of infectious processes from the nasopharynx to the middle ear, causing OM. […] In children, developmental alterations of the ET, an immature immune system, and frequent infections of the upper respiratory mucosa all play major roles in AOM development. Studies have demonstrated how viral infection of the upper respiratory epithelium leads to increased ETD and increased bacterial colonization and adherence in the nasopharynx.
#14 Otitis Media: Practice Essentials, Background, Pathophysiology
https://emedicine.medscape.com/article/994656-overview
Otitis media (OM) is any inflammation of the middle ear, without reference to etiology or pathogenesis. It can be classified into many variants on the basis of etiology, duration, symptomatology, and physical findings. […] The most important factor in middle ear disease is eustachian tube (ET) dysfunction (ETD), in which the mucosa at the pharyngeal end of the ET is part of the mucociliary system of the middle ear. Interference with this mucosa by edema, tumor, or negative intratympanic pressure facilitates direct extension of infectious processes from the nasopharynx to the middle ear, causing OM. […] In children, developmental alterations of the ET, an immature immune system, and frequent infections of the upper respiratory mucosa all play major roles in AOM development. Studies have demonstrated how viral infection of the upper respiratory epithelium leads to increased ETD and increased bacterial colonization and adherence in the nasopharynx.
#15 Management of acute otitis media in children six months of age and older | Canadian Paediatric Society
https://cps.ca/documents/position/acute-otitis-media
AOM is extremely common, and 75% of children experience at least one ear infection before starting school. […] ET dysfunction or obstruction due to a viral infection or other causes of mucosal inflammation can impair this normal mechanism. The lack of middle ear drainage leads to fluid stasis and, if the fluid is colonized with bacterial and/or viral pathogens, can lead to AOM. […] Children are predisposed to AOM because they acquire viral infections more often than adults, and their ETs are also shorter and more horizontal compared with adults. […] A small proportion of children have lower levels of secretory immunoglobulin A or persistent biofilms in the middle ear, which may play a role in increasing the risk for recurrent AOM. […] There is a clinical spectrum of middle ear infections associated with the initiation and progression of infection leading to bacterial AOM.
#16 Panel 7 â Pathogenesis of otitis media â a review of the literature between 2015 and 2019
https://pmc.ncbi.nlm.nih.gov/articles/PMC7062565/
To perform a comprehensive review of the literature from July 2015 to June 2019 on the pathogenesis of otitis media. Bacteria, viruses and the role of the microbiome as well as the host response are discussed. Directions for future research are also suggested. […] The main themes that arose in OM pathogenesis were around the need for symptomatic viral infections to develop disease. Different populations potentially having different mechanisms of pathogenesis. Novel bacterial otopathogens are emerging and need to be monitored. Animal models need to continue to be developed and used to understand disease pathogenesis. […] Viral infection is required for the initial development of bacterial AOM. Recent studies have shown that the presence of respiratory viruses in the nasopharynx is not enough for the development of AOM; viral replication and the respiratory symptoms caused by the viral infection are also necessary.
#17 Panel 7 â Pathogenesis of otitis media â a review of the literature between 2015 and 2019
https://pmc.ncbi.nlm.nih.gov/articles/PMC7062565/
The requirement for inflammation has been demonstrated in the AOM chinchilla model where chinchillas were infected with S. pneumoniae and three different adenoviruses. Infection with a wild-type adenovirus or a hyperinflammatory adenovirus increased the proportion of ears identified as culture positive for S. pneumoniae compared to animals infected with bacteria alone. However, infection with the non-replicating adenovirus did not increase the incidence of bacterial AOM. […] Since the introduction of pneumococcal conjugate vaccines, we have seen the emergence of non-encapsulated pneumococcal variants (also referred to in some studies as nontypeable). Studies have demonstrated that non-encapsulated pneumococci can colonize and persist within the nasopharynx, and also have the capacity to persist within the middle-ear chamber in the chinchilla.
#18 Otitis Media: Practice Essentials, Background, Pathophysiology
https://emedicine.medscape.com/article/994656-overview
Certain viral infections cause abnormal host immune and inflammatory responses in the ET mucosa and subsequent microbial invasion of the middle ear. The host immune and inflammatory response to bacterial invasion of the middle ear produces fluid in the middle ear and the signs and symptoms of AOM. […] Although interactions between the common pathogenic bacteria in AOM and certain viruses are not fully understood, strong evidence indicates that these interactions often lead to more severe disease, lowered response to antimicrobial therapy, and OME development following AOM.
#19 Otitis Media: Practice Essentials, Background, Pathophysiology
https://emedicine.medscape.com/article/994656-overview
Certain viral infections cause abnormal host immune and inflammatory responses in the ET mucosa and subsequent microbial invasion of the middle ear. The host immune and inflammatory response to bacterial invasion of the middle ear produces fluid in the middle ear and the signs and symptoms of AOM. […] Although interactions between the common pathogenic bacteria in AOM and certain viruses are not fully understood, strong evidence indicates that these interactions often lead to more severe disease, lowered response to antimicrobial therapy, and OME development following AOM.
#20 Panel 7 â Pathogenesis of otitis media â a review of the literature between 2015 and 2019
https://pmc.ncbi.nlm.nih.gov/articles/PMC7062565/
Non-encapsulated strains utilize a diverse range of gene products for colonization and infection. Some non-encapsulated pneumococcal lineages express a surface protein, PspK, which is important in bacterial adherence to host epithelia as well as formation of biofilms and persistence in vivo. […] Non-typeable strains of Haemophilus influenzae (NTHi) have continued to grow as important causative agents of OM and other respiratory infections over the past four years. […] Biofilms are formed by nearly all bacterial species and provide many protective benefits, which include recalcitrance to antimicrobial treatments and innate immune effectors. […] Otopathogens have been demonstrated to organize into biofilms within the nasopharynx and the middle ear and this is important in disease persistence and chronicity. The importance of biofilm formation for the pathogen is exemplified by the in vivo production of molecules such as autoinducers that promote biofilm formation, prevent dispersal and increase persistence.
#21 Swimmer’s ear – Symptoms & causes – Mayo Clinic
https://www.mayoclinic.org/diseases-conditions/swimmers-ear/symptoms-causes/syc-20351682
Swimmer’s ear is an infection that’s usually caused by bacteria. It’s less common for a fungus or virus to cause swimmer’s ear. […] Having swimmer’s ear means the ear’s natural defenses have not worked well. The conditions that often play a role in infection include: Moisture in the ear canal that makes an ideal place for bacteria to grow. Contact with contaminated water. Damage to the skin of the ear canal, which can be an entry point for bacteria. […] Swimmer’s ear usually isn’t serious if treated quickly. But complications that can happen include: Long-term infection, called chronic otitis externa. This involves symptoms of outer ear infection that last for more than three months. Chronic infections are more common if treatment is hard. Treatment can be hard when there is a rare strain of bacteria, an allergic skin reaction, an allergic reaction to antibiotic ear drops, a skin condition such as dermatitis or psoriasis, or a combined bacterial and fungal infection.
#22 Swimmer’s ear – Symptoms & causes – Mayo Clinic
https://www.mayoclinic.org/diseases-conditions/swimmers-ear/symptoms-causes/syc-20351682
Swimmer’s ear is an infection that’s usually caused by bacteria. It’s less common for a fungus or virus to cause swimmer’s ear. […] Having swimmer’s ear means the ear’s natural defenses have not worked well. The conditions that often play a role in infection include: Moisture in the ear canal that makes an ideal place for bacteria to grow. Contact with contaminated water. Damage to the skin of the ear canal, which can be an entry point for bacteria. […] Swimmer’s ear usually isn’t serious if treated quickly. But complications that can happen include: Long-term infection, called chronic otitis externa. This involves symptoms of outer ear infection that last for more than three months. Chronic infections are more common if treatment is hard. Treatment can be hard when there is a rare strain of bacteria, an allergic skin reaction, an allergic reaction to antibiotic ear drops, a skin condition such as dermatitis or psoriasis, or a combined bacterial and fungal infection.
#23 External Ear Infection (Otitis Externa)
https://www.healthhub.sg/a-z/diseases-and-conditions/external-ear-infections-otitis-externa-sengkang-general-hospital
The skin of the ear canal is normally protected by a waxy, water-resistant coating. Bacteria living on the surface of the skin can cause otitis externa when there is a break in the skins barrier. Trauma to the skin of the ear canal from cotton tips or fingernails can result in a break in the barrier. Someone who swims frequently is also predisposed to external ear infection. Prolonged exposure to moisture results in the water-resistant coating and skin becoming soft, allowing bacteria to infect the skin. […] Diabetics are at higher risk due to poor immunity. They are also more prone to an aggressive form of infection called malignant otitis externa, in which the infection involves the skull bone.
#24 Otitis Externa – Causes – Clinical Features – Management – TeachMeSurgery
https://teachmesurgery.com/ent/ear/otitis-externa/
Otitis externa typically affects the external auditory canal, the part of the ear via which sound waves travel to reach the tympanic membrane. […] Any interruption in wax formation (e.g. repeated water exposure), trauma to the canal (e.g. cotton buds), or blockage (e.g. debris) can disrupt the external auditory canal’s protective mechanisms and lead to pathogen overgrowth and inflammation. […] The skin becomes erythematous, swollen, tender, and warm, leading to debris and discharge accumulation. The narrowing of the canal, in combination with the accumulation of debris, leads to further entrapment of pathogens and propagating the infective process. […] The most common causative pathogens include Pseudomonas Aeruginosa (around 40%), S. Epidermidis, S. Aureus, and anaerobes. In rarer cases, it can be due to a fungal infection (typically Aspergillus spp. or Candida).
#25 Otitis Externa – Causes – Clinical Features – Management – TeachMeSurgery
https://teachmesurgery.com/ent/ear/otitis-externa/
Otitis externa typically affects the external auditory canal, the part of the ear via which sound waves travel to reach the tympanic membrane. […] Any interruption in wax formation (e.g. repeated water exposure), trauma to the canal (e.g. cotton buds), or blockage (e.g. debris) can disrupt the external auditory canal’s protective mechanisms and lead to pathogen overgrowth and inflammation. […] The skin becomes erythematous, swollen, tender, and warm, leading to debris and discharge accumulation. The narrowing of the canal, in combination with the accumulation of debris, leads to further entrapment of pathogens and propagating the infective process. […] The most common causative pathogens include Pseudomonas Aeruginosa (around 40%), S. Epidermidis, S. Aureus, and anaerobes. In rarer cases, it can be due to a fungal infection (typically Aspergillus spp. or Candida).
#26 Otitis Externa – Causes – Clinical Features – Management – TeachMeSurgery
https://teachmesurgery.com/ent/ear/otitis-externa/
Malignant otitis externa is an extension of otitis externa into the mastoid and temporal bones, resulting in skull base osteomyelitis. It typically occurs in older, diabetic, or immunocompromised patients. […] These patients require an urgent HRCT scan of the temporal bones for a formal diagnosis.
#27 External Ear Infection (Otitis Externa)
https://www.healthhub.sg/a-z/diseases-and-conditions/external-ear-infections-otitis-externa-sengkang-general-hospital
The skin of the ear canal is normally protected by a waxy, water-resistant coating. Bacteria living on the surface of the skin can cause otitis externa when there is a break in the skins barrier. Trauma to the skin of the ear canal from cotton tips or fingernails can result in a break in the barrier. Someone who swims frequently is also predisposed to external ear infection. Prolonged exposure to moisture results in the water-resistant coating and skin becoming soft, allowing bacteria to infect the skin. […] Diabetics are at higher risk due to poor immunity. They are also more prone to an aggressive form of infection called malignant otitis externa, in which the infection involves the skull bone.
#28 Ear infection (middle ear) – Symptoms & causes – Mayo Clinic
https://www.mayoclinic.org/diseases-conditions/ear-infections/symptoms-causes/syc-20351616
Adenoids are near the opening of the eustachian tubes. Swelling of the adenoids can block the tubes. This can lead to middle ear infection, especially in children. […] Most ear infections don’t cause long-term complications. Ear infections that happen again and again can lead to serious complications: […] Mild hearing loss is common with an ear infection. But hearing usually gets better after the infection clears. Ear infections that happen again and again or constant fluid in the middle ear can cause worse hearing loss. If there’s lasting damage to the eardrum or other parts of the middle ear, hearing might not get better. […] Spread of infection. Untreated infections or infections that don’t respond well to treatment can spread to nearby tissues. Rarely, an ear infection can cause infection of the bony section behind the ear, known as mastoiditis. This infection can harm the bone and cause pus-filled cysts. […] Also rarely, serious middle ear infections can spread to other tissues in the head. This can infect the brain or the membranes around the brain, an infection known as meningitis.
#29 Ear infection (middle ear) – Symptoms & causes – Mayo Clinic
https://www.mayoclinic.org/diseases-conditions/ear-infections/symptoms-causes/syc-20351616
Adenoids are near the opening of the eustachian tubes. Swelling of the adenoids can block the tubes. This can lead to middle ear infection, especially in children. […] Most ear infections don’t cause long-term complications. Ear infections that happen again and again can lead to serious complications: […] Mild hearing loss is common with an ear infection. But hearing usually gets better after the infection clears. Ear infections that happen again and again or constant fluid in the middle ear can cause worse hearing loss. If there’s lasting damage to the eardrum or other parts of the middle ear, hearing might not get better. […] Spread of infection. Untreated infections or infections that don’t respond well to treatment can spread to nearby tissues. Rarely, an ear infection can cause infection of the bony section behind the ear, known as mastoiditis. This infection can harm the bone and cause pus-filled cysts. […] Also rarely, serious middle ear infections can spread to other tissues in the head. This can infect the brain or the membranes around the brain, an infection known as meningitis.
#30 Causes of Hearing Loss in Children
https://www.asha.org/public/hearing/causes-of-hearing-loss-in-children/?srsltid=AfmBOoqgKb-v6eS4rJDn2hRlalBKjBarKjVrnAOvMDw-rvfGrEQhyN9C
Otitis media is an inflammation in the middle ear (the area behind the eardrum) that is usually associated with the buildup of fluid. The fluid may or may not be infected. […] Fluctuating conductive hearing loss nearly always occurs with all types of otitis media. In fact it is the most common cause of hearing loss in young children. […] How can otitis media cause a hearing loss? Three tiny bones in the middle ear carry sound vibrations from the eardrum to the inner ear. When fluid is present, the vibrations are not transmitted efficiently and sound energy is lost. The result may be mild or even moderate hearing loss. Therefore, speech sounds are muffled or inaudible. […] Generally, this type of hearing loss is conductive and is temporary. However when otitis media occurs over and over again, damage to the eardrum, the bones of the ear, or even the hearing nerve can occur and cause a permanent, sensorineural hearing loss.
#31 Causes of Hearing Loss in Children
https://www.asha.org/public/hearing/causes-of-hearing-loss-in-children/?srsltid=AfmBOoqgKb-v6eS4rJDn2hRlalBKjBarKjVrnAOvMDw-rvfGrEQhyN9C
Otitis media is an inflammation in the middle ear (the area behind the eardrum) that is usually associated with the buildup of fluid. The fluid may or may not be infected. […] Fluctuating conductive hearing loss nearly always occurs with all types of otitis media. In fact it is the most common cause of hearing loss in young children. […] How can otitis media cause a hearing loss? Three tiny bones in the middle ear carry sound vibrations from the eardrum to the inner ear. When fluid is present, the vibrations are not transmitted efficiently and sound energy is lost. The result may be mild or even moderate hearing loss. Therefore, speech sounds are muffled or inaudible. […] Generally, this type of hearing loss is conductive and is temporary. However when otitis media occurs over and over again, damage to the eardrum, the bones of the ear, or even the hearing nerve can occur and cause a permanent, sensorineural hearing loss.
#32 Ear infection (middle ear) – Symptoms & causes – Mayo Clinic
https://www.mayoclinic.org/diseases-conditions/ear-infections/symptoms-causes/syc-20351616
Adenoids are near the opening of the eustachian tubes. Swelling of the adenoids can block the tubes. This can lead to middle ear infection, especially in children. […] Most ear infections don’t cause long-term complications. Ear infections that happen again and again can lead to serious complications: […] Mild hearing loss is common with an ear infection. But hearing usually gets better after the infection clears. Ear infections that happen again and again or constant fluid in the middle ear can cause worse hearing loss. If there’s lasting damage to the eardrum or other parts of the middle ear, hearing might not get better. […] Spread of infection. Untreated infections or infections that don’t respond well to treatment can spread to nearby tissues. Rarely, an ear infection can cause infection of the bony section behind the ear, known as mastoiditis. This infection can harm the bone and cause pus-filled cysts. […] Also rarely, serious middle ear infections can spread to other tissues in the head. This can infect the brain or the membranes around the brain, an infection known as meningitis.
#33 Ear infection (middle ear) – Symptoms & causes – Mayo Clinic
https://www.mayoclinic.org/diseases-conditions/ear-infections/symptoms-causes/syc-20351616
Adenoids are near the opening of the eustachian tubes. Swelling of the adenoids can block the tubes. This can lead to middle ear infection, especially in children. […] Most ear infections don’t cause long-term complications. Ear infections that happen again and again can lead to serious complications: […] Mild hearing loss is common with an ear infection. But hearing usually gets better after the infection clears. Ear infections that happen again and again or constant fluid in the middle ear can cause worse hearing loss. If there’s lasting damage to the eardrum or other parts of the middle ear, hearing might not get better. […] Spread of infection. Untreated infections or infections that don’t respond well to treatment can spread to nearby tissues. Rarely, an ear infection can cause infection of the bony section behind the ear, known as mastoiditis. This infection can harm the bone and cause pus-filled cysts. […] Also rarely, serious middle ear infections can spread to other tissues in the head. This can infect the brain or the membranes around the brain, an infection known as meningitis.
#34 Loyola Otolaryngologists Find Ear Infections Can Lead to Neurological Complications | News | Loyola Medicine
https://www.loyolamedicine.org/newsroom/press-releases/ear-infections-can-lead-neurological-complications
While antibiotics have greatly reduced the dangers of ear infections, serious neurological complications, including hearing loss, facial paralysis, meningitis and brain abscess still occur, according to an article in the journal Current Neurology and Neuroscience Reports. […] It describes the symptoms, diagnosis and management of the neurologic complications of acute and chronic otitis media (middle ear infection). […] The deadliest complication of otitis media is a brain abscess, an accumulation of pus in the brain due to an infection. […] Other complications include: Bacterial meningitis: Symptoms include severe headache, high fever, neck stiffness, irritability, altered mental status and malaise. […] „Antibiotic therapy has greatly reduced the frequency of complications of otitis media,” Drs. Hutz, Moore and Hotaling wrote. „However, it is of vital importance to remain aware of the possible development of neurologic complication. . . . In order to reduce morbidity, early deployment of a multidisciplinary approach with prompt imaging and laboratory studies is imperative to guide appropriate management.”
#35 Otitis Media: Practice Essentials, Background, Pathophysiology
https://emedicine.medscape.com/article/994656-overview
Otitis media (OM) is any inflammation of the middle ear, without reference to etiology or pathogenesis. It can be classified into many variants on the basis of etiology, duration, symptomatology, and physical findings. […] The most important factor in middle ear disease is eustachian tube (ET) dysfunction (ETD), in which the mucosa at the pharyngeal end of the ET is part of the mucociliary system of the middle ear. Interference with this mucosa by edema, tumor, or negative intratympanic pressure facilitates direct extension of infectious processes from the nasopharynx to the middle ear, causing OM. […] In children, developmental alterations of the ET, an immature immune system, and frequent infections of the upper respiratory mucosa all play major roles in AOM development. Studies have demonstrated how viral infection of the upper respiratory epithelium leads to increased ETD and increased bacterial colonization and adherence in the nasopharynx.
#36 Management of acute otitis media in children six months of age and older | Canadian Paediatric Society
https://cps.ca/documents/position/acute-otitis-media
AOM is extremely common, and 75% of children experience at least one ear infection before starting school. […] ET dysfunction or obstruction due to a viral infection or other causes of mucosal inflammation can impair this normal mechanism. The lack of middle ear drainage leads to fluid stasis and, if the fluid is colonized with bacterial and/or viral pathogens, can lead to AOM. […] Children are predisposed to AOM because they acquire viral infections more often than adults, and their ETs are also shorter and more horizontal compared with adults. […] A small proportion of children have lower levels of secretory immunoglobulin A or persistent biofilms in the middle ear, which may play a role in increasing the risk for recurrent AOM. […] There is a clinical spectrum of middle ear infections associated with the initiation and progression of infection leading to bacterial AOM.
#37 Ear Infections: Causes, Acute vs. Chronic, and Recovery Time
https://www.webmd.com/cold-and-flu/ear-infection/understanding-otitis-media-basics
The middle ear is a small space behind your eardrum. It contains tiny bones that vibrate and help you hear. This part of your ear is supposed to be vented by air that passes into your nose and throat and through a passage called the eustachian tube. If anything blocks air from getting through, the middle ear can become damp and warm a perfect breeding ground for germs. […] In babies and kids, the eustachian tube is often very soft and has a hard time staying open. Allergies, post-nasal drainage, sinus infections, common cold viruses, and problems with the tonsils can all prevent enough air from passing into the middle ear. […] The most common trigger of an ear infection in kids is an upper respiratory infection, like a cold or the flu. These viruses can swell the eustachian tube so that air can’t flow into the middle ear. Allergies to pollen, dust, animal dander, or food can have the same effect. So can smoke, fumes, and other environmental toxins. Bacteria can cause an ear infection, but usually these germs come after a virus or an allergic reaction. Bacteria can infect an already inflamed ear and cause other symptoms, like a fever.
#38 Ear infections: Symptoms, types, and causes
https://www.medicalnewstoday.com/articles/167409
A respiratory infection or allergy can block the eustachian tubes, causing a buildup of fluids in the middle ear. Infection can occur due to bacteria or a virus. […] The eustachian tubes of young children are smaller and more horizontal than in older children and adults. This means that fluid is more likely to collect in the tubes rather than drain away, increasing the risk of an ear infection. […] The adenoids can sometimes trap bacteria, however. This can lead to infection and inflammation of the eustachian tubes and middle ear. […] If the diagnosis is COME, then a healthcare professional may recommend ear tubes as a part of treatment.
#39 Ear Infections: Causes, Acute vs. Chronic, and Recovery Time
https://www.webmd.com/cold-and-flu/ear-infection/understanding-otitis-media-basics
The middle ear is a small space behind your eardrum. It contains tiny bones that vibrate and help you hear. This part of your ear is supposed to be vented by air that passes into your nose and throat and through a passage called the eustachian tube. If anything blocks air from getting through, the middle ear can become damp and warm a perfect breeding ground for germs. […] In babies and kids, the eustachian tube is often very soft and has a hard time staying open. Allergies, post-nasal drainage, sinus infections, common cold viruses, and problems with the tonsils can all prevent enough air from passing into the middle ear. […] The most common trigger of an ear infection in kids is an upper respiratory infection, like a cold or the flu. These viruses can swell the eustachian tube so that air can’t flow into the middle ear. Allergies to pollen, dust, animal dander, or food can have the same effect. So can smoke, fumes, and other environmental toxins. Bacteria can cause an ear infection, but usually these germs come after a virus or an allergic reaction. Bacteria can infect an already inflamed ear and cause other symptoms, like a fever.
#40 Ear Infections: Causes, Acute vs. Chronic, and Recovery Time
https://www.webmd.com/cold-and-flu/ear-infection/understanding-otitis-media-basics
The middle ear is a small space behind your eardrum. It contains tiny bones that vibrate and help you hear. This part of your ear is supposed to be vented by air that passes into your nose and throat and through a passage called the eustachian tube. If anything blocks air from getting through, the middle ear can become damp and warm a perfect breeding ground for germs. […] In babies and kids, the eustachian tube is often very soft and has a hard time staying open. Allergies, post-nasal drainage, sinus infections, common cold viruses, and problems with the tonsils can all prevent enough air from passing into the middle ear. […] The most common trigger of an ear infection in kids is an upper respiratory infection, like a cold or the flu. These viruses can swell the eustachian tube so that air can’t flow into the middle ear. Allergies to pollen, dust, animal dander, or food can have the same effect. So can smoke, fumes, and other environmental toxins. Bacteria can cause an ear infection, but usually these germs come after a virus or an allergic reaction. Bacteria can infect an already inflamed ear and cause other symptoms, like a fever.
#41
https://newsroom.uw.edu/blog/earache-might-be-because-smoke
Some patients are surprised to learn that the ears, nose, and throat are connected, said Dr. Albert Merati, medical director of otolaryngology at UW Medical Center Montlake. Its all the same system, he said. Things that irritate your nose or throat would also irritate your ears. […] The lining of the nose and ear particularly have a certain type of clearing mechanism that is very vulnerable in terms of its response to outside irritants, such as tobacco smoke, secondhand smoke and profound exposure such as the environmental challenges were facing today with the smoke thats in the air, Merati said. […] Merati expects to see an increase in ear infections in the following weeks, especially among children. […] Even after the smoke comes and goes, I wonder if there will be people who find they have persistent symptoms that it wasnt the lingering effect of the smoke but rather (that) this experience unearthed a problem that was already brewing, he said. Patients who continue to have symptoms after the air clears such as nasal congestion, pain, breathing difficulty, sore throat might consider talking with a primary-care physician or otolaryngologist.
#42 Management of acute otitis media in children six months of age and older | Canadian Paediatric Society
https://cps.ca/documents/position/acute-otitis-media
AOM is extremely common, and 75% of children experience at least one ear infection before starting school. […] ET dysfunction or obstruction due to a viral infection or other causes of mucosal inflammation can impair this normal mechanism. The lack of middle ear drainage leads to fluid stasis and, if the fluid is colonized with bacterial and/or viral pathogens, can lead to AOM. […] Children are predisposed to AOM because they acquire viral infections more often than adults, and their ETs are also shorter and more horizontal compared with adults. […] A small proportion of children have lower levels of secretory immunoglobulin A or persistent biofilms in the middle ear, which may play a role in increasing the risk for recurrent AOM. […] There is a clinical spectrum of middle ear infections associated with the initiation and progression of infection leading to bacterial AOM.
#43 Ear pain explained: Why noise can cause physical agony
https://www.statnews.com/2016/02/18/noise-induced-ear-pain/
The problems start with the pea-sized cochlea, a tiny sensory organ buried within a skull bone. Its tough to reach and impossible to biopsy, thereby hampering experimental work. Within the cochlea, one kind of nerve fiber has long puzzled scientists. These mystery fibers resemble pain fibers elsewhere in the body. […] It took 15 years, but using several strains of deaf mice, Jaime Garca-Aoveros, an associate professor of anesthesiology at Northwestern University Feinberg School of Medicine, found that intense noise causes activity in these fibers. […] At around the same time, a lab at Johns Hopkins University found that when certain sensory cells of the cochlea are damaged, as might occur during very loud noise, they release a chemical that activates the mysterious pain fibers. In some people, these fibers seem to switch on and never switch off. […] Individual susceptibility to noise exposure varies greatly, and may be genetic. […] It is time for pain hyperacusis to be recognized as a real symptom, not as a psychosomatic phenomenon, Garca-Aoveros said. This is, in a way, a new sensory modality a hybrid of pain and hearing.
#44 Clogged and ringing ears: Causes and treatment
https://www.medicalnewstoday.com/articles/ear-feels-clogged-and-ringing
Possible causes of clogged and ringing ears include earwax impaction, an infection, or acoustic neuroma. […] Some conditions that cause clogged and ringing ears result in temporarily clogged ears, but others may cause permanent hearing problems. […] People with too much earwax may experience the following symptoms: ear discomfort, hearing loss, itching, ringing in the ears, earache, dizziness, ear fullness. […] People may develop eustachian tube dysfunction when the eustachian tube is not functioning correctly. […] Symptoms of eustachian tube dysfunction are mild and resolve without intervention after a few days. […] Some researchers propose that certain genetic and environmental factors may contribute to Menieres disease. […] Some studies have demonstrated that people with Menieres disease may have fluid buildup in the cochlea and vestibular organs in the ear. […] Pathogens, such as viruses, bacteria, or a combination of both, can cause ear infections. […] Scientists believe that people may develop acoustic neuromas from an overproduction of Schwann cells. […] Typically, acoustic neuromas occur on one side, but bilateral acoustic neuromas may occur.
#45 Otalgia – StatPearls – NCBI Bookshelf
https://www.ncbi.nlm.nih.gov/books/NBK549830/
Otalgia or ear pain is a multifaceted condition categorized into primary and secondary otalgia. Primary otalgia originates directly from an ear pathology, while secondary otalgia results from referred pain from extraneous sources. […] Understanding the relevant neural connections is pivotal for diagnostic accuracy and management effectiveness. […] The activity underscores the collaborative role of the interprofessional team in diagnosing and managing otalgia, considering the diverse neural pathways involved in this intricate sensory experience. […] Understanding the innervation patterns of these nerves helps in the differential diagnosis of otalgia and determining whether the pain originates from the ear itself or is referred from nearby structures. Accurate diagnosis based on the underlying etiology is essential for appropriate management and ear pain resolution.
#46 Otalgia | Treatment & Management | Point of Care
https://www.statpearls.com/point-of-care/26421
Primary otalgia stems most commonly from infection. AOM is the most frequent primary otalgia cause in children. The disease is typically associated with an upper respiratory tract infection that causes eustachian tube congestion and swelling. Eustachian tube swelling at this location can impede or prevent middle ear drainage. Collected middle ear secretions, known as an effusion, may lead to conductive hearing loss and potential bacterial growth, resulting in acute infection and pain. […] Chronic suppurative otitis media is the most common primary cause of otalgia in adults. The condition is a complication of eustachian tube dysfunction, similar to AOM. However, chronic suppurative otitis media is more likely to be a long-term problem requiring surgical management. […] Secondary or referred otalgia occurs due to the ear’s complex sensory nerve network. This nerve network also provides innervation to structures in the head and neck and distant sites, predisposing to referred pain when neurally connected distant sites are injured or inflamed. One theoretical mechanism of referred otalgia is the convergence-projection theory, which states that these nerves converge onto a shared neural pathway. Given the plethora of organs sharing the ear’s innervation pathways, secondary otalgia can arise from many locations.
#47 The Radiology of Referred Otalgia | American Journal of Neuroradiology
http://www.ajnr.org/content/30/10/1817
Pain referred to the ear is a well-documented phenomenon, which can be due to a multitude of disease processes. […] Essentially any pathology residing within the sensory net of cranial nerves V, VII, IX, and X and the upper cervical nerves C2 and C3 can potentially cause referred otalgia. […] Although the mechanism of referred otalgia is slightly controversial, the most accepted theory is the convergence-projection theory, which states that multiple nerves converge onto a single shared neural pathway, with the central nervous system (CNS) unable to differentiate the origin of stimulation. […] In referred otalgia, there is a convergence of common sensory pathways between the complex sensory innervation supplying both the ear and cranial nerves innervating the head and neck, with the CNS unable to correctly pinpoint the location of pathology. […] This sensory error is analogous to a patient’s having pain in the medial left arm when experiencing an acute coronary syndrome or patient’s feeling pain in the shoulder when, in actuality, a lesion is irritating the patient’s diaphragm.
#48 Otalgia – StatPearls – NCBI Bookshelf
https://www.ncbi.nlm.nih.gov/books/NBK549830/
Otalgia or ear pain is a multifaceted condition categorized into primary and secondary otalgia. Primary otalgia originates directly from an ear pathology, while secondary otalgia results from referred pain from extraneous sources. […] Understanding the relevant neural connections is pivotal for diagnostic accuracy and management effectiveness. […] The activity underscores the collaborative role of the interprofessional team in diagnosing and managing otalgia, considering the diverse neural pathways involved in this intricate sensory experience. […] Understanding the innervation patterns of these nerves helps in the differential diagnosis of otalgia and determining whether the pain originates from the ear itself or is referred from nearby structures. Accurate diagnosis based on the underlying etiology is essential for appropriate management and ear pain resolution.