Przedwczesne zagnieżdżenie łożyska – Rokowania, prognozy i postęp choroby

Przedwczesne zagnieżdżenie łożyska
Rokowania, prognozy i postęp choroby

Przedwczesne zagnieżdżenie łożyska (placenta previa) to poważne powikłanie ciąży, występujące u około 0,5% ciężarnych, charakteryzujące się całkowitym lub częściowym zakryciem ujścia wewnętrznego szyjki macicy przez łożysko. Stan ten jest istotnym czynnikiem ryzyka krwotoku poporodowego, z aRR 2,6 (95% CI 1,9-3,5) dla powikłań krwotocznych u matki, a około 19% pacjentek doświadcza krwawienia, z 20% wymagającymi nagłego porodu. Dodatkowo, ryzyko transfuzji krwi (aRR 3,8), atonii macicy (aRR 3,1), histerektomii (aRR 5,1) oraz innych powikłań, takich jak odklejenie łożyska czy przedwczesny poród, jest znacząco podwyższone. Lokalizacja łożyska na przedniej ścianie macicy oraz wcześniejsze cesarskie cięcia zwiększają ryzyko łożyska wrośniętego (PAS), z ryzykiem accrety rosnącym do 67% przy piątym lub kolejnych cięciach. Przedwczesne zagnieżdżenie łożyska wiąże się także z 3-4-krotnie wyższą śmiertelnością i zachorowalnością noworodków, głównie z powodu przedwczesnego porodu, który występuje u 16,9% przed 34. tygodniem i 27,5% między 34. a 37. tygodniem ciąży.

Wprowadzenie do problematyki przedwczesnego zagnieżdżenia łożyska (placenta previa)
Rokowanie dla matki w przypadku przedwczesnego zagnieżdżenia łożyska

Powikłania krwotoczne
Czynniki ryzyka krwotoku u pacjentek z przedwczesnym zagnieżdżeniem łożyska
Zwiększone ryzyko łożyska patologicznie przyrośniętego (PAS)

Rokowanie dla płodu i noworodka

Powikłania neonatologiczne

Prognozowanie ryzyka ciężkich krwotoków

Modele predykcyjne

Znaczenie regularnej opieki prenatalnej
Całościowe rokowanie w przedwczesnym zagnieżdżeniu łożyska

Kolejne rozdziały

Wprowadzenie do problematyki przedwczesnego zagnieżdżenia łożyska (placenta previa)

Przedwczesne zagnieżdżenie łożyska (placenta previa) to stan, w którym łożysko rozwija się w dolnej części macicy i całkowicie lub częściowo zakrywa ujście wewnętrzne szyjki macicy. Jest to poważne powikłanie ciąży występujące u około 0,5% wszystkich ciężarnych, stanowiące główny czynnik ryzyka krwotok-poporodowy/” title=”krwotok poporodowy” class=”to-tag” data-termid=”19259″>krwotoku poporodowego, który może prowadzić do zwiększonej zachorowalności i śmiertelności zarówno matki, jak i noworodka.¹²³

Znaczące postępy w technologii ultrasonograficznej umożliwiły wczesne diagnozowanie przedwczesnego zagnieżdżenia łożyska. Warto zauważyć, że około 90% przypadków łożysk określanych jako nisko położone we wczesnych badaniach ultrasonograficznych nie utrzymuje tej pozycji do momentu porodu i przemieszcza się wraz ze wzrostem macicy, co powoduje, że w trzecim trymestrze problem ten nie występuje.⁴

Rokowanie dla matki w przypadku przedwczesnego zagnieżdżenia łożyska

Przedwczesne zagnieżdżenie łożyska wiąże się z istotnymi zagrożeniami dla zdrowia i życia matki. Badania wykazały, że placenta previa jest niezależnym czynnikiem ryzyka powikłań krwotocznych u matki, ze skorygowanym współczynnikiem ryzyka (aRR) wynoszącym 2,6 (95% CI 1,9-3,5). Około 19% kobiet z przedwczesnym zagnieżdżeniem łożyska doświadcza powikłań krwotocznych, a 20% wymaga nagłego porodu z powodu krwawienia przedporodowego.⁵

Powikłania krwotoczne

Najpoważniejszym zagrożeniem związanym z przedwczesnym zagnieżdżeniem łożyska jest krwotok, który może zagrażać życiu zarówno matki, jak i dziecka. Kluczowe jest wczesne rozpoznanie i odpowiednie postępowanie, aby zminimalizować to ryzyko.⁶ Krwawienie pochwowe wtórne do przedwczesnego zagnieżdżenia łożyska może prowadzić do krwotoku poporodowego wymagającego transfuzji krwi, histerektomii, przyjęcia matki na oddział intensywnej terapii, posocznicy, a nawet śmierci matki.⁷

U kobiet z placenta previa istnieje zwiększone ryzyko:⁸⁹

Krwotoku, w tym ponownego krwawienia
Wyższych wskaźników transfuzji krwi (aRR 3,8, 95% CI 2,5-5,7)
Atonii macicy wymagającej leków naskurczowych (aRR 3,1, 95% CI 2,0-4,9)
Odklejenia łożyska
Przedwczesnego porodu
Zwiększonej częstości poporodowego zapalenia endometrium
Histerektomii (aRR 5,1, 95% CI 1,5-17,3), nawet przy braku łożyska wrośniętego
Śmiertelności (2-3% na świecie; w USA 0,03%)

Czynniki ryzyka krwotoku u pacjentek z przedwczesnym zagnieżdżeniem łożyska

Badania zidentyfikowały szereg czynników związanych z większym ryzykiem krwawienia u kobiet z placenta previa:¹⁰

Anemia przedporodowa
Małopłytkowość
Cukrzyca
Stosowanie magnezu
Znieczulenie ogólne

Ponadto, badania wykazały, że kobiety z łożyskiem położonym na przedniej ścianie macicy mają gorsze czynniki prognostyczne i są bardziej narażone na masywną utratę krwi oraz wyższe wskaźniki histerektomii w porównaniu do innych lokalizacji łożyska. Wynika to z przyczepiania się łożyska do wcześniejszego nacięcia macicy, co powoduje zwiększone ryzyko łożyska wrośniętego (PAS) oraz wykonywania nacięcia przez łożysko podczas cesarskiego cięcia.¹¹

Zwiększone ryzyko łożyska patologicznie przyrośniętego (PAS)

Kobiety z przedwczesnym zagnieżdżeniem łożyska i wcześniejszymi cesarskimi cięciami są narażone na zwiększone ryzyko patologicznego przyrostu łożyska (PAS). Ryzyko łożyska wrośniętego (placenta accreta) wynosi: 3% przy pierwszym cesarskim cięciu, 11% przy drugim, 40% przy trzecim, 61% przy czwartym oraz 67% przy piątym lub kolejnych cięciach cesarskich.¹² Plany dotyczące porodu i kontroli krwawienia są kluczowe w przypadkach przedwczesnego zagnieżdżenia łożyska, a także łożyska wrośniętego, przerośniętego i przerastającego.¹³

Rokowanie dla płodu i noworodka

Przedwczesne zagnieżdżenie łożyska wiąże się z trzy- do czterokrotnie zwiększoną śmiertelnością i zachorowalnością noworodków, głównie z powodu przedwczesnego porodu.¹⁴ Badania populacyjne pokazują, że znaczny odsetek kobiet z placenta previa rodzi przedwcześnie: 16,9% przed 34. tygodniem ciąży i 27,5% między 34. a 37. tygodniem.¹⁵

Metaanaliza przeprowadzona przez Jansena i wsp. wykazała, że zbiorcze odsetki ryzyka przedwczesnego porodu przed 37., 34., 32. i 28. tygodniem ciąży u kobiet w ciąży z przedwczesnym zagnieżdżeniem łożyska wynosiły odpowiednio 46%, 17%, 10% i 2%.¹⁶

Powikłania neonatologiczne

Noworodki matek z przedwczesnym zagnieżdżeniem łożyska są narażone na zwiększone ryzyko:¹⁷¹⁸¹⁹

Przedwczesnego porodu
Niższej masy urodzeniowej (poniżej 2500 g)
Niższych wyników w skali APGAR
Zwiększonego ryzyka zespołu niewydolności oddechowej
Wad wrodzonych
Wewnątrzmacicznego opóźnienia wzrostu płodu (IUGR)
Niedokrwistości płodu i izoimunizacji Rh
Nieprawidłowej prezentacji płodu
Żółtaczki
Przyjęcia na oddział intensywnej terapii noworodkowej (NICU)
Dłuższego pobytu w szpitalu
Zwiększonego ryzyka opóźnień neurorozwojowych i zespołu nagłej śmierci niemowląt (SIDS)

Wskaźnik śmiertelności noworodków wynosi nawet 1,2% w Stanach Zjednoczonych.²⁰

Prognozowanie ryzyka ciężkich krwotoków

Dokładne przewidywanie ciężkiego krwotoku w przypadku przedwczesnego zagnieżdżenia łożyska ma kluczowe znaczenie dla stratyfikacji ryzyka i optymalnej alokacji interwencji medycznych.²¹ Możliwość klasyfikacji ryzyka krwawienia przed operacją pozwala na odpowiednie przydzielenie zasobów, takich jak personel medyczny, przygotowanie do transfuzji krwi oraz radiologii interwencyjnej.²²

Modele predykcyjne

Badania nad wielomodalnymi modelami głębokiego uczenia do przewidywania masywnego krwotoku podczas cesarskiego cięcia w przypadkach przedwczesnego zagnieżdżenia łożyska wykorzystują dane demograficzne pacjentek i przedoperacyjne obrazy MRI. Wyniki badań wskazują, że wielomodalne modele głębokiego uczenia mogą przewidywać ciężkie krwotoki lepiej niż eksperci ludzcy i modele uczenia maszynowego wykorzystujące pojedyncze typy danych.²³

Mimo że wielkość zestawu danych w cytowanych badaniach była stosunkowo niewielka, wyniki pokazały, że wielomodalne głębokie uczenie integrujące informacje kliniczne może prowadzić do lepszej wydajności predykcyjnej (dokładność 0,68). W przyszłych badaniach, przy większym zestawie danych i bardziej efektywnej segmentacji obrazów MRI, wydajność predykcyjna może być dodatkowo poprawiona.²⁴²⁵

Znaczenie regularnej opieki prenatalnej

W przypadku większości kobiet, które otrzymują regularną opiekę prenatalną, przedwczesne zagnieżdżenie łożyska jest diagnozowane przed pojawieniem się objawów. Pozwala to lekarzowi i matce podjąć kroki mające na celu zminimalizowanie ryzyka związanego z tym stanem.²⁶ Wczesna diagnoza i właściwe postępowanie są kluczowe w zapobieganiu powikłaniom, które mogą prowadzić do zwiększonej zachorowalności i śmiertelności zarówno matki, jak i płodu.²⁷

Około 90% przypadków przedwczesnego zagnieżdżenia łożyska rozwiązuje się do momentu porodu, co oznacza, że łożysko przemieszcza się do wyższej części macicy wraz z jej rozrostem.²⁸ Regularne badania ultrasonograficzne pozwalają monitorować położenie łożyska i odpowiednio dostosować plan opieki.

Całościowe rokowanie w przedwczesnym zagnieżdżeniu łożyska

Przedwczesne zagnieżdżenie łożyska stanowi poważne wyzwanie położnicze, niosące za sobą istotne ryzyko powikłań zarówno dla matki, jak i dla dziecka. Pacjentki z potwierdzonym przedwczesnym zagnieżdżeniem łożyska są narażone na ryzyko transfuzji krwi, uszkodzenia okolicznych narządów, histerektomii położniczej (0,2%), przyjęcia na oddział intensywnej terapii i śmierci. Istnieje również zwiększone ryzyko w kolejnych ciążach.²⁹

Najpoważniejszym zagrożeniem jest ciężkie krwawienie, które może zagrażać życiu matki i dziecka. Jeśli występuje silne krwawienie, może być konieczne przedwczesne rozwiązanie ciąży, zanim główne narządy dziecka, takie jak płuca, w pełni się rozwiną.³⁰

Wczesna diagnoza, odpowiednie postępowanie i gotowość do natychmiastowej interwencji w przypadku krwawienia są kluczowe dla poprawy rokowania. Rozwój zaawansowanych modeli predykcyjnych może w przyszłości pomóc w lepszej identyfikacji pacjentek wysokiego ryzyka i optymalizacji alokacji zasobów medycznych, co powinno przyczynić się do poprawy wyników położniczych w tej grupie pacjentek.³¹³²

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Materiały źródłowe

#1 Placenta Previa – StatPearls – NCBI Bookshelf
https://www.ncbi.nlm.nih.gov/books/NBK539818/
Placenta previa is the complete or partial covering of the internal os of the cervix with the placenta. It is a major risk factor for postpartum hemorrhage and can lead to morbidity and mortality of the mother and neonate. […] There is a threefold to fourfold increased neonatal mortality and morbidity rate with placenta previa primarily from preterm delivery. The neonate is at increased risk of preterm birth, lower birth weight, lower APGAR scores, and increased risk for respiratory distress syndrome. […] About 90% of placenta previa cases resolve through delivery. Jing et al. found that women with anterior placentas have poorer prognostic factors and are more likely to have massive blood loss and higher hysterectomy rates compared to any other location. This outcome is secondary to the placenta attaching to a prior uterine incision causing PAS and an incision going through the placenta. Patient’s with confirmed placenta previa are at risk for blood transfusion, injury to nearby organs, cesarean hysterectomy (0.2%), intensive care admission, and death. There is also an increased risk in subsequent pregnancies.
#2 Placenta Previa: Practice Essentials, Pathophysiology, Etiology
https://emedicine.medscape.com/article/262063-overview
Placenta previa complicates approximately 0.5% of all pregnancies. Technologic advances in ultrasonography have increased the early diagnosis of placenta previa, and several studies have shown that a significant portion of these early diagnoses do not persist until delivery. In fact, 90% of all placentas designated as low lying on an early sonogram are no longer present on repeat examination in the third trimester. […] However, maternal and fetal complications of placenta previa are well documented. Preterm birth is highly associated with placenta previa, with 16.9% of women delivering at less than 34 weeks and 27.5% delivering between 34 and 37 weeks in a population-based study from 1989 to 1997. A meta-analysis by Jansen et al showed that pooled proportions for the risk of preterm birth before 37, 34, 32 and 28 weeks of gestation in pregnant persons with placenta previa were 46%, 17%, 10%, and 2%, respectively. There is a significant increase in the risk of postpartum hemorrhage and need for emergency hysterectomy in women with placenta previa.
#3 Placenta previa Information | Mount Sinai – New York
https://www.mountsinai.org/health-library/diseases-conditions/placenta-previa
Placenta previa is a problem of pregnancy in which the placenta grows in the lowest part of the womb (uterus) and covers all or part of the opening to the cervix. […] The biggest risk is severe bleeding that can be life threatening to the mother and baby. If you have severe bleeding, your baby may need to be delivered early, before major organs, such as the lungs, have developed. […] For most women who receive regular prenatal care, this condition is diagnosed before symptoms appear. This helps the provider and mother take steps to minimize risks from this condition.
#4 Placenta Previa: Practice Essentials, Pathophysiology, Etiology
https://emedicine.medscape.com/article/262063-overview
Placenta previa complicates approximately 0.5% of all pregnancies. Technologic advances in ultrasonography have increased the early diagnosis of placenta previa, and several studies have shown that a significant portion of these early diagnoses do not persist until delivery. In fact, 90% of all placentas designated as low lying on an early sonogram are no longer present on repeat examination in the third trimester. […] However, maternal and fetal complications of placenta previa are well documented. Preterm birth is highly associated with placenta previa, with 16.9% of women delivering at less than 34 weeks and 27.5% delivering between 34 and 37 weeks in a population-based study from 1989 to 1997. A meta-analysis by Jansen et al showed that pooled proportions for the risk of preterm birth before 37, 34, 32 and 28 weeks of gestation in pregnant persons with placenta previa were 46%, 17%, 10%, and 2%, respectively. There is a significant increase in the risk of postpartum hemorrhage and need for emergency hysterectomy in women with placenta previa.
#5 Placenta Previa and Maternal Hemorrhagic Morbidity
https://pmc.ncbi.nlm.nih.gov/articles/PMC6687304/
Placenta previa is associated with maternal hemorrhage, but most literature focuses on morbidity in the setting of placenta accreta. We aim to characterize maternal morbidity associated with previa and to define risk factors for hemorrhage. Maternal hemorrhagic morbidity was more common in women with previa (19 vs 7%, aRR 2.6, 95% CI 1.9-3.5). Atony requiring uterotonics (aRR 3.1, 95% CI 2.0-4.9), red blood cell transfusion (aRR 3.8, 95% CI 2.5-5.7), and hysterectomy (aRR 5.1, 95% CI 1.5-17.3) were also more common with previa. For women with previa, factors associated with maternal hemorrhage were pre-delivery anemia, thrombocytopenia, diabetes, magnesium use, and general anesthesia. Placenta previa is an independent risk factor for maternal hemorrhagic morbidity. Some risk factors are modifiable, but many are intrinsic to the clinical scenario. The primary outcome of maternal hemorrhagic morbidity was higher in women with previa (19% vs 7%; aRR 2.6, 95% CI 1.9-3.5). In women with previa, hemorrhagic morbidity was more common in women with bleeding as the indication for delivery than in women with other indications for delivery (24.2 vs 11.2%, p0.001). In this cohort 20% (or 1 out of 5) women with previa underwent emergent delivery for antenatal hemorrhage. The burden of this morbidity is substantial. Placenta previa was associated with an overall increased risk of maternal hemorrhagic morbidity (aRR 2.6, 95% CI 1.9-3.5), with 18.6% of women with previa suffering the composite primary outcome. Factors associated with hemorrhage in our cohort included pre-delivery anemia, thrombocytopenia, diabetes, magnesium, and general anesthesia. Regardless, these risk factors warrant clinical vigilance and preparation for hemorrhage. Several investigators have tried to predict which women with placenta previa are at risk for hemorrhage or early delivery. In conclusion, in this large cohort of women, placenta previa is an independent risk factor for maternal hemorrhagic morbidity. Nineteen percent of women with previa experienced hemorrhagic morbidity, 20% were delivered emergently for antenatal bleeding, and 2% required hysterectomy (even in the absence of accreta).
#6 Placenta previa Information | Mount Sinai – New York
https://www.mountsinai.org/health-library/diseases-conditions/placenta-previa
Placenta previa is a problem of pregnancy in which the placenta grows in the lowest part of the womb (uterus) and covers all or part of the opening to the cervix. […] The biggest risk is severe bleeding that can be life threatening to the mother and baby. If you have severe bleeding, your baby may need to be delivered early, before major organs, such as the lungs, have developed. […] For most women who receive regular prenatal care, this condition is diagnosed before symptoms appear. This helps the provider and mother take steps to minimize risks from this condition.
#7 Placenta Previa – StatPearls – NCBI Bookshelf
https://www.ncbi.nlm.nih.gov/books/NBK539818/
Vaginal bleeding secondary to placenta previa can lead to postpartum hemorrhage requiring a blood transfusion, hysterectomy, maternal intensive care admission, septicemia, and maternal death. Placenta previa that is not diagnosed early enough or managed improperly can lead to morbidity and mortality for both the mother and fetus. Placenta previa is also associated with preterm birth, low birth weight, lower APGAR scores, longer duration of hospitalization, and higher blood transfusion rates. Women with placenta previa and prior history of cesarean sections are at an increased risk of PAS. Risk of placenta accreta is 3%, 11%, 40%, 61%, and 67%, for the first, second, third, fourth, and fifth or more cesarean, respectively.
#8 Placenta Previa: Practice Essentials, Pathophysiology, Etiology
https://emedicine.medscape.com/article/262063-overview
Maternal complications of placenta previa are summarized as follows: Hemorrhage, including rebleeding (Planning delivery and control of hemorrhage is critical in cases of placenta previa as well as placenta accreta, increta, and percreta.); Higher rates of blood transfusion; Placental abruption; Preterm delivery; Increased incidence of postpartum endometritis; Mortality rate (2-3%); in the US, the maternal mortality rate is 0.03%, the great majority of which is related to uterine bleeding and the complication of disseminated intravascular coagulopathy. […] Complications of placenta previa in the neonate/infant are summarized as follows: Congenital malformations; Fetal intrauterine growth retardation (IUGR); Fetal anemia and Rh isoimmunization; Abnormal fetal presentation; Low birth weight ( 2500 g); Neonatal respiratory distress syndrome; Jaundice; Admission to the neonatal intensive care unit (NICU); Longer hospital stay; Increased risk for infant neurodevelopmental delay and sudden infant death syndrome (SIDS); Neonatal mortality rate: As high as 1.2% in the United States.
#9 Placenta Previa and Maternal Hemorrhagic Morbidity
https://pmc.ncbi.nlm.nih.gov/articles/PMC6687304/
Placenta previa is associated with maternal hemorrhage, but most literature focuses on morbidity in the setting of placenta accreta. We aim to characterize maternal morbidity associated with previa and to define risk factors for hemorrhage. Maternal hemorrhagic morbidity was more common in women with previa (19 vs 7%, aRR 2.6, 95% CI 1.9-3.5). Atony requiring uterotonics (aRR 3.1, 95% CI 2.0-4.9), red blood cell transfusion (aRR 3.8, 95% CI 2.5-5.7), and hysterectomy (aRR 5.1, 95% CI 1.5-17.3) were also more common with previa. For women with previa, factors associated with maternal hemorrhage were pre-delivery anemia, thrombocytopenia, diabetes, magnesium use, and general anesthesia. Placenta previa is an independent risk factor for maternal hemorrhagic morbidity. Some risk factors are modifiable, but many are intrinsic to the clinical scenario. The primary outcome of maternal hemorrhagic morbidity was higher in women with previa (19% vs 7%; aRR 2.6, 95% CI 1.9-3.5). In women with previa, hemorrhagic morbidity was more common in women with bleeding as the indication for delivery than in women with other indications for delivery (24.2 vs 11.2%, p0.001). In this cohort 20% (or 1 out of 5) women with previa underwent emergent delivery for antenatal hemorrhage. The burden of this morbidity is substantial. Placenta previa was associated with an overall increased risk of maternal hemorrhagic morbidity (aRR 2.6, 95% CI 1.9-3.5), with 18.6% of women with previa suffering the composite primary outcome. Factors associated with hemorrhage in our cohort included pre-delivery anemia, thrombocytopenia, diabetes, magnesium, and general anesthesia. Regardless, these risk factors warrant clinical vigilance and preparation for hemorrhage. Several investigators have tried to predict which women with placenta previa are at risk for hemorrhage or early delivery. In conclusion, in this large cohort of women, placenta previa is an independent risk factor for maternal hemorrhagic morbidity. Nineteen percent of women with previa experienced hemorrhagic morbidity, 20% were delivered emergently for antenatal bleeding, and 2% required hysterectomy (even in the absence of accreta).
#10 Placenta Previa and Maternal Hemorrhagic Morbidity
https://pmc.ncbi.nlm.nih.gov/articles/PMC6687304/
Placenta previa is associated with maternal hemorrhage, but most literature focuses on morbidity in the setting of placenta accreta. We aim to characterize maternal morbidity associated with previa and to define risk factors for hemorrhage. Maternal hemorrhagic morbidity was more common in women with previa (19 vs 7%, aRR 2.6, 95% CI 1.9-3.5). Atony requiring uterotonics (aRR 3.1, 95% CI 2.0-4.9), red blood cell transfusion (aRR 3.8, 95% CI 2.5-5.7), and hysterectomy (aRR 5.1, 95% CI 1.5-17.3) were also more common with previa. For women with previa, factors associated with maternal hemorrhage were pre-delivery anemia, thrombocytopenia, diabetes, magnesium use, and general anesthesia. Placenta previa is an independent risk factor for maternal hemorrhagic morbidity. Some risk factors are modifiable, but many are intrinsic to the clinical scenario. The primary outcome of maternal hemorrhagic morbidity was higher in women with previa (19% vs 7%; aRR 2.6, 95% CI 1.9-3.5). In women with previa, hemorrhagic morbidity was more common in women with bleeding as the indication for delivery than in women with other indications for delivery (24.2 vs 11.2%, p0.001). In this cohort 20% (or 1 out of 5) women with previa underwent emergent delivery for antenatal hemorrhage. The burden of this morbidity is substantial. Placenta previa was associated with an overall increased risk of maternal hemorrhagic morbidity (aRR 2.6, 95% CI 1.9-3.5), with 18.6% of women with previa suffering the composite primary outcome. Factors associated with hemorrhage in our cohort included pre-delivery anemia, thrombocytopenia, diabetes, magnesium, and general anesthesia. Regardless, these risk factors warrant clinical vigilance and preparation for hemorrhage. Several investigators have tried to predict which women with placenta previa are at risk for hemorrhage or early delivery. In conclusion, in this large cohort of women, placenta previa is an independent risk factor for maternal hemorrhagic morbidity. Nineteen percent of women with previa experienced hemorrhagic morbidity, 20% were delivered emergently for antenatal bleeding, and 2% required hysterectomy (even in the absence of accreta).
#11 Placenta Previa – StatPearls – NCBI Bookshelf
https://www.ncbi.nlm.nih.gov/books/NBK539818/
Placenta previa is the complete or partial covering of the internal os of the cervix with the placenta. It is a major risk factor for postpartum hemorrhage and can lead to morbidity and mortality of the mother and neonate. […] There is a threefold to fourfold increased neonatal mortality and morbidity rate with placenta previa primarily from preterm delivery. The neonate is at increased risk of preterm birth, lower birth weight, lower APGAR scores, and increased risk for respiratory distress syndrome. […] About 90% of placenta previa cases resolve through delivery. Jing et al. found that women with anterior placentas have poorer prognostic factors and are more likely to have massive blood loss and higher hysterectomy rates compared to any other location. This outcome is secondary to the placenta attaching to a prior uterine incision causing PAS and an incision going through the placenta. Patient’s with confirmed placenta previa are at risk for blood transfusion, injury to nearby organs, cesarean hysterectomy (0.2%), intensive care admission, and death. There is also an increased risk in subsequent pregnancies.
#12 Placenta Previa – StatPearls – NCBI Bookshelf
https://www.ncbi.nlm.nih.gov/books/NBK539818/
Vaginal bleeding secondary to placenta previa can lead to postpartum hemorrhage requiring a blood transfusion, hysterectomy, maternal intensive care admission, septicemia, and maternal death. Placenta previa that is not diagnosed early enough or managed improperly can lead to morbidity and mortality for both the mother and fetus. Placenta previa is also associated with preterm birth, low birth weight, lower APGAR scores, longer duration of hospitalization, and higher blood transfusion rates. Women with placenta previa and prior history of cesarean sections are at an increased risk of PAS. Risk of placenta accreta is 3%, 11%, 40%, 61%, and 67%, for the first, second, third, fourth, and fifth or more cesarean, respectively.
#13 Placenta Previa: Practice Essentials, Pathophysiology, Etiology
https://emedicine.medscape.com/article/262063-overview
Maternal complications of placenta previa are summarized as follows: Hemorrhage, including rebleeding (Planning delivery and control of hemorrhage is critical in cases of placenta previa as well as placenta accreta, increta, and percreta.); Higher rates of blood transfusion; Placental abruption; Preterm delivery; Increased incidence of postpartum endometritis; Mortality rate (2-3%); in the US, the maternal mortality rate is 0.03%, the great majority of which is related to uterine bleeding and the complication of disseminated intravascular coagulopathy. […] Complications of placenta previa in the neonate/infant are summarized as follows: Congenital malformations; Fetal intrauterine growth retardation (IUGR); Fetal anemia and Rh isoimmunization; Abnormal fetal presentation; Low birth weight ( 2500 g); Neonatal respiratory distress syndrome; Jaundice; Admission to the neonatal intensive care unit (NICU); Longer hospital stay; Increased risk for infant neurodevelopmental delay and sudden infant death syndrome (SIDS); Neonatal mortality rate: As high as 1.2% in the United States.
#14 Placenta Previa – StatPearls – NCBI Bookshelf
https://www.ncbi.nlm.nih.gov/books/NBK539818/
Placenta previa is the complete or partial covering of the internal os of the cervix with the placenta. It is a major risk factor for postpartum hemorrhage and can lead to morbidity and mortality of the mother and neonate. […] There is a threefold to fourfold increased neonatal mortality and morbidity rate with placenta previa primarily from preterm delivery. The neonate is at increased risk of preterm birth, lower birth weight, lower APGAR scores, and increased risk for respiratory distress syndrome. […] About 90% of placenta previa cases resolve through delivery. Jing et al. found that women with anterior placentas have poorer prognostic factors and are more likely to have massive blood loss and higher hysterectomy rates compared to any other location. This outcome is secondary to the placenta attaching to a prior uterine incision causing PAS and an incision going through the placenta. Patient’s with confirmed placenta previa are at risk for blood transfusion, injury to nearby organs, cesarean hysterectomy (0.2%), intensive care admission, and death. There is also an increased risk in subsequent pregnancies.
#15 Placenta Previa: Practice Essentials, Pathophysiology, Etiology
https://emedicine.medscape.com/article/262063-overview
Placenta previa complicates approximately 0.5% of all pregnancies. Technologic advances in ultrasonography have increased the early diagnosis of placenta previa, and several studies have shown that a significant portion of these early diagnoses do not persist until delivery. In fact, 90% of all placentas designated as low lying on an early sonogram are no longer present on repeat examination in the third trimester. […] However, maternal and fetal complications of placenta previa are well documented. Preterm birth is highly associated with placenta previa, with 16.9% of women delivering at less than 34 weeks and 27.5% delivering between 34 and 37 weeks in a population-based study from 1989 to 1997. A meta-analysis by Jansen et al showed that pooled proportions for the risk of preterm birth before 37, 34, 32 and 28 weeks of gestation in pregnant persons with placenta previa were 46%, 17%, 10%, and 2%, respectively. There is a significant increase in the risk of postpartum hemorrhage and need for emergency hysterectomy in women with placenta previa.
#16 Placenta Previa: Practice Essentials, Pathophysiology, Etiology
https://emedicine.medscape.com/article/262063-overview
Placenta previa complicates approximately 0.5% of all pregnancies. Technologic advances in ultrasonography have increased the early diagnosis of placenta previa, and several studies have shown that a significant portion of these early diagnoses do not persist until delivery. In fact, 90% of all placentas designated as low lying on an early sonogram are no longer present on repeat examination in the third trimester. […] However, maternal and fetal complications of placenta previa are well documented. Preterm birth is highly associated with placenta previa, with 16.9% of women delivering at less than 34 weeks and 27.5% delivering between 34 and 37 weeks in a population-based study from 1989 to 1997. A meta-analysis by Jansen et al showed that pooled proportions for the risk of preterm birth before 37, 34, 32 and 28 weeks of gestation in pregnant persons with placenta previa were 46%, 17%, 10%, and 2%, respectively. There is a significant increase in the risk of postpartum hemorrhage and need for emergency hysterectomy in women with placenta previa.
#17 Placenta Previa – StatPearls – NCBI Bookshelf
https://www.ncbi.nlm.nih.gov/books/NBK539818/
Placenta previa is the complete or partial covering of the internal os of the cervix with the placenta. It is a major risk factor for postpartum hemorrhage and can lead to morbidity and mortality of the mother and neonate. […] There is a threefold to fourfold increased neonatal mortality and morbidity rate with placenta previa primarily from preterm delivery. The neonate is at increased risk of preterm birth, lower birth weight, lower APGAR scores, and increased risk for respiratory distress syndrome. […] About 90% of placenta previa cases resolve through delivery. Jing et al. found that women with anterior placentas have poorer prognostic factors and are more likely to have massive blood loss and higher hysterectomy rates compared to any other location. This outcome is secondary to the placenta attaching to a prior uterine incision causing PAS and an incision going through the placenta. Patient’s with confirmed placenta previa are at risk for blood transfusion, injury to nearby organs, cesarean hysterectomy (0.2%), intensive care admission, and death. There is also an increased risk in subsequent pregnancies.
#18 Placenta Previa – StatPearls – NCBI Bookshelf
https://www.ncbi.nlm.nih.gov/books/NBK539818/
Vaginal bleeding secondary to placenta previa can lead to postpartum hemorrhage requiring a blood transfusion, hysterectomy, maternal intensive care admission, septicemia, and maternal death. Placenta previa that is not diagnosed early enough or managed improperly can lead to morbidity and mortality for both the mother and fetus. Placenta previa is also associated with preterm birth, low birth weight, lower APGAR scores, longer duration of hospitalization, and higher blood transfusion rates. Women with placenta previa and prior history of cesarean sections are at an increased risk of PAS. Risk of placenta accreta is 3%, 11%, 40%, 61%, and 67%, for the first, second, third, fourth, and fifth or more cesarean, respectively.
#19 Placenta Previa: Practice Essentials, Pathophysiology, Etiology
https://emedicine.medscape.com/article/262063-overview
Maternal complications of placenta previa are summarized as follows: Hemorrhage, including rebleeding (Planning delivery and control of hemorrhage is critical in cases of placenta previa as well as placenta accreta, increta, and percreta.); Higher rates of blood transfusion; Placental abruption; Preterm delivery; Increased incidence of postpartum endometritis; Mortality rate (2-3%); in the US, the maternal mortality rate is 0.03%, the great majority of which is related to uterine bleeding and the complication of disseminated intravascular coagulopathy. […] Complications of placenta previa in the neonate/infant are summarized as follows: Congenital malformations; Fetal intrauterine growth retardation (IUGR); Fetal anemia and Rh isoimmunization; Abnormal fetal presentation; Low birth weight ( 2500 g); Neonatal respiratory distress syndrome; Jaundice; Admission to the neonatal intensive care unit (NICU); Longer hospital stay; Increased risk for infant neurodevelopmental delay and sudden infant death syndrome (SIDS); Neonatal mortality rate: As high as 1.2% in the United States.
#20 Placenta Previa: Practice Essentials, Pathophysiology, Etiology
https://emedicine.medscape.com/article/262063-overview
Maternal complications of placenta previa are summarized as follows: Hemorrhage, including rebleeding (Planning delivery and control of hemorrhage is critical in cases of placenta previa as well as placenta accreta, increta, and percreta.); Higher rates of blood transfusion; Placental abruption; Preterm delivery; Increased incidence of postpartum endometritis; Mortality rate (2-3%); in the US, the maternal mortality rate is 0.03%, the great majority of which is related to uterine bleeding and the complication of disseminated intravascular coagulopathy. […] Complications of placenta previa in the neonate/infant are summarized as follows: Congenital malformations; Fetal intrauterine growth retardation (IUGR); Fetal anemia and Rh isoimmunization; Abnormal fetal presentation; Low birth weight ( 2500 g); Neonatal respiratory distress syndrome; Jaundice; Admission to the neonatal intensive care unit (NICU); Longer hospital stay; Increased risk for infant neurodevelopmental delay and sudden infant death syndrome (SIDS); Neonatal mortality rate: As high as 1.2% in the United States.
#21 A multimodal deep learning model for predicting severe hemorrhage in placenta previa | Scientific Reports
https://www.nature.com/articles/s41598-023-44634-1
Placenta previa causes life-threatening bleeding and accurate prediction of severe hemorrhage leads to risk stratification and optimum allocation of interventions. […] Accurate prediction leads to the classification of bleeding risk, which in turn leads to the allocation of medical and human resources. […] In this study, we investigated a multimodal deep learning model for predicting massive hemorrhage during cesarean section for placenta previa, using patient demographics and preoperative MRI images. […] This study showed that multimodal deep learning models can predict severe hemorrhages better than human experts and machine learning models using single data types. […] Although the size of the dataset was too small and future studies are required to verify our findings, this study demonstrated that multimodal deep learning integrating clinical information could lead to better predictive performance (accuracy, 0.68).
#22 A multimodal deep learning model for predicting severe hemorrhage in placenta previa | Scientific Reports
https://www.nature.com/articles/s41598-023-44634-1
If the possibility of severe hemorrhage can be output with numerical values using models, risk classification can be performed preoperatively, leading to the optimum allocation of interventions such as medical staff, blood transfusion, and interventional radiology. […] In future studies, with a larger dataset and more efficient segmentation of MRI images, the prediction performance could be improved.
#23 A multimodal deep learning model for predicting severe hemorrhage in placenta previa | Scientific Reports
https://www.nature.com/articles/s41598-023-44634-1
Placenta previa causes life-threatening bleeding and accurate prediction of severe hemorrhage leads to risk stratification and optimum allocation of interventions. […] Accurate prediction leads to the classification of bleeding risk, which in turn leads to the allocation of medical and human resources. […] In this study, we investigated a multimodal deep learning model for predicting massive hemorrhage during cesarean section for placenta previa, using patient demographics and preoperative MRI images. […] This study showed that multimodal deep learning models can predict severe hemorrhages better than human experts and machine learning models using single data types. […] Although the size of the dataset was too small and future studies are required to verify our findings, this study demonstrated that multimodal deep learning integrating clinical information could lead to better predictive performance (accuracy, 0.68).
#24 A multimodal deep learning model for predicting severe hemorrhage in placenta previa | Scientific Reports
https://www.nature.com/articles/s41598-023-44634-1
Placenta previa causes life-threatening bleeding and accurate prediction of severe hemorrhage leads to risk stratification and optimum allocation of interventions. […] Accurate prediction leads to the classification of bleeding risk, which in turn leads to the allocation of medical and human resources. […] In this study, we investigated a multimodal deep learning model for predicting massive hemorrhage during cesarean section for placenta previa, using patient demographics and preoperative MRI images. […] This study showed that multimodal deep learning models can predict severe hemorrhages better than human experts and machine learning models using single data types. […] Although the size of the dataset was too small and future studies are required to verify our findings, this study demonstrated that multimodal deep learning integrating clinical information could lead to better predictive performance (accuracy, 0.68).
#25 A multimodal deep learning model for predicting severe hemorrhage in placenta previa | Scientific Reports
https://www.nature.com/articles/s41598-023-44634-1
If the possibility of severe hemorrhage can be output with numerical values using models, risk classification can be performed preoperatively, leading to the optimum allocation of interventions such as medical staff, blood transfusion, and interventional radiology. […] In future studies, with a larger dataset and more efficient segmentation of MRI images, the prediction performance could be improved.
#26 Placenta previa Information | Mount Sinai – New York
https://www.mountsinai.org/health-library/diseases-conditions/placenta-previa
Placenta previa is a problem of pregnancy in which the placenta grows in the lowest part of the womb (uterus) and covers all or part of the opening to the cervix. […] The biggest risk is severe bleeding that can be life threatening to the mother and baby. If you have severe bleeding, your baby may need to be delivered early, before major organs, such as the lungs, have developed. […] For most women who receive regular prenatal care, this condition is diagnosed before symptoms appear. This helps the provider and mother take steps to minimize risks from this condition.
#27 Placenta Previa – StatPearls – NCBI Bookshelf
https://www.ncbi.nlm.nih.gov/books/NBK539818/
Vaginal bleeding secondary to placenta previa can lead to postpartum hemorrhage requiring a blood transfusion, hysterectomy, maternal intensive care admission, septicemia, and maternal death. Placenta previa that is not diagnosed early enough or managed improperly can lead to morbidity and mortality for both the mother and fetus. Placenta previa is also associated with preterm birth, low birth weight, lower APGAR scores, longer duration of hospitalization, and higher blood transfusion rates. Women with placenta previa and prior history of cesarean sections are at an increased risk of PAS. Risk of placenta accreta is 3%, 11%, 40%, 61%, and 67%, for the first, second, third, fourth, and fifth or more cesarean, respectively.
#28 Placenta Previa – StatPearls – NCBI Bookshelf
https://www.ncbi.nlm.nih.gov/books/NBK539818/
Placenta previa is the complete or partial covering of the internal os of the cervix with the placenta. It is a major risk factor for postpartum hemorrhage and can lead to morbidity and mortality of the mother and neonate. […] There is a threefold to fourfold increased neonatal mortality and morbidity rate with placenta previa primarily from preterm delivery. The neonate is at increased risk of preterm birth, lower birth weight, lower APGAR scores, and increased risk for respiratory distress syndrome. […] About 90% of placenta previa cases resolve through delivery. Jing et al. found that women with anterior placentas have poorer prognostic factors and are more likely to have massive blood loss and higher hysterectomy rates compared to any other location. This outcome is secondary to the placenta attaching to a prior uterine incision causing PAS and an incision going through the placenta. Patient’s with confirmed placenta previa are at risk for blood transfusion, injury to nearby organs, cesarean hysterectomy (0.2%), intensive care admission, and death. There is also an increased risk in subsequent pregnancies.
#29 Placenta Previa – StatPearls – NCBI Bookshelf
https://www.ncbi.nlm.nih.gov/books/NBK539818/
Placenta previa is the complete or partial covering of the internal os of the cervix with the placenta. It is a major risk factor for postpartum hemorrhage and can lead to morbidity and mortality of the mother and neonate. […] There is a threefold to fourfold increased neonatal mortality and morbidity rate with placenta previa primarily from preterm delivery. The neonate is at increased risk of preterm birth, lower birth weight, lower APGAR scores, and increased risk for respiratory distress syndrome. […] About 90% of placenta previa cases resolve through delivery. Jing et al. found that women with anterior placentas have poorer prognostic factors and are more likely to have massive blood loss and higher hysterectomy rates compared to any other location. This outcome is secondary to the placenta attaching to a prior uterine incision causing PAS and an incision going through the placenta. Patient’s with confirmed placenta previa are at risk for blood transfusion, injury to nearby organs, cesarean hysterectomy (0.2%), intensive care admission, and death. There is also an increased risk in subsequent pregnancies.
#30 Placenta previa Information | Mount Sinai – New York
https://www.mountsinai.org/health-library/diseases-conditions/placenta-previa
Placenta previa is a problem of pregnancy in which the placenta grows in the lowest part of the womb (uterus) and covers all or part of the opening to the cervix. […] The biggest risk is severe bleeding that can be life threatening to the mother and baby. If you have severe bleeding, your baby may need to be delivered early, before major organs, such as the lungs, have developed. […] For most women who receive regular prenatal care, this condition is diagnosed before symptoms appear. This helps the provider and mother take steps to minimize risks from this condition.
#31 A multimodal deep learning model for predicting severe hemorrhage in placenta previa | Scientific Reports
https://www.nature.com/articles/s41598-023-44634-1
Placenta previa causes life-threatening bleeding and accurate prediction of severe hemorrhage leads to risk stratification and optimum allocation of interventions. […] Accurate prediction leads to the classification of bleeding risk, which in turn leads to the allocation of medical and human resources. […] In this study, we investigated a multimodal deep learning model for predicting massive hemorrhage during cesarean section for placenta previa, using patient demographics and preoperative MRI images. […] This study showed that multimodal deep learning models can predict severe hemorrhages better than human experts and machine learning models using single data types. […] Although the size of the dataset was too small and future studies are required to verify our findings, this study demonstrated that multimodal deep learning integrating clinical information could lead to better predictive performance (accuracy, 0.68).
#32 A multimodal deep learning model for predicting severe hemorrhage in placenta previa | Scientific Reports
https://www.nature.com/articles/s41598-023-44634-1
If the possibility of severe hemorrhage can be output with numerical values using models, risk classification can be performed preoperatively, leading to the optimum allocation of interventions such as medical staff, blood transfusion, and interventional radiology. […] In future studies, with a larger dataset and more efficient segmentation of MRI images, the prediction performance could be improved.