Materiały źródłowe

• #1 Atrioventricular Nodal Reentry Tachycardia – StatPearls – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK499936/

  Atrioventricular nodal reentrant tachycardia (AVNRT) is a type of paroxysmal supraventricular tachycardia that results due to the presence of a re-entry circuit within or adjacent to the AV node. The diagnosis of AVNRT requires visualization of an electrocardiogram (ECG). In most cases, an ECG will show heart rate between 140 and 280 beats per minute (bpm), and in the absence of aberrant conduction, a QRS complex of fewer than 120 milliseconds. […] Atrioventricular nodal reentrant tachycardia (AVNRT) is a type of paroxysmal supraventricular tachycardia that results due to the presence of a reentry circuit within or adjacent to the AV node. The diagnosis of AVNRT requires visualization on an electrocardiogram (ECG). In most cases, an ECG will show heart rate between 140 and 280 beats per minute (bpm), and in the absence of aberrant conduction, a QRS complex of fewer than 120 milliseconds.

• #1 Atrioventricular nodal reentry tachycardia (AVNRT) – Diagnosis and treatment – Mayo Clinic

  https://www.mayoclinic.org/diseases-conditions/avnrt/diagnosis-treatment/drc-20573853

  To diagnose atrioventricular nodal reentry tachycardia (AVNRT), a healthcare professional examines you and asks questions about your symptoms and medical history. The healthcare professional listens to your heart and lungs using a stethoscope. […] Tests used to diagnose atrioventricular nodal reentry tachycardia (AVNRT) may include: […] Electrocardiogram (ECG or EKG). This simple test checks the electrical activity of the heart. It shows how fast or slow the heart is beating. […] Electrophysiological study. Also called an EP study, this test can show where in the heart the irregular heartbeat starts. During this test, a doctor guides one or more flexible tubes through a blood vessel, usually in the groin, to various areas in the heart. Sensors on the tips of the tubes record the heart’s electrical signals.

• #1 AV Nodal Reentrant Tachycardia: Causes, Symptoms, and TreatmentHealthline

  https://www.healthline.com/health/arrhythmia/av-nodal-reentrant-tachycardia

  Atrioventricular (AV) nodal reentrant tachycardia (AVNRT) is an irregular heart rhythm that can cause excessively fast heart rates. […] Early diagnosis can help prevent severe symptoms and complications. […] AVNRT is a type of irregular heart rhythm (arrhythmia). […] People with AVNRT may experience a sudden rapid heart rate upward of 140 to 280 beats per minute. […] However, getting an early diagnosis usually leads to a favorable outlook for people with AVNRT. […] If you’ve recently received an AVNRT diagnosis or are concerned you might have this condition, read on to learn more about how it develops, some of the common signs and symptoms, and how a doctor will diagnose and treat it. […] An ECG is important in diagnosing AVNRT. […] However, since the signs and symptoms of AVNRT are sporadic like other types of PSVTs, a doctor may require multiple readings or recommend a home heart monitor.

• #1 AVNRT for two • LITFL • ECG Library Diagnosis

  https://litfl.com/avnrt-for-two/

  A 56 year old year old woman presents to the Emergency Department with a referral from her General Practitioner for assessment and management of severe tachycardia and possible myocardial infarction following a sudden onset of palpitations. […] On the history, examination and ECG findings, the patient was diagnosed with Slow-Fast AVNRT (Atrioventricular Nodal Reentrant Tachycardia) and successfully treated with 6mg of adenosine. […] Atrioventricular Nodal Reentrant Tachycardia is a type of supraventricular tachycardia (ie it originates above the level of the Bundle of His) and is the commonest cause of palpitations in patients with hearts exhibiting no structurally abnormality. […] The ECG will typically show a tachycardia of 140-280 bpm with normal and regular QRS complexes. There will be either

• #1

  https://www.pafmj.org/PAFMJ/article/view/4419

  Objective: To evaluate specificity, sensitivity and diagnostic accuracy of r deflection at the end of the QRS complex in leads aVR and V1 of ECG for diagnosis of AVNRT […] The AVNRT was correctly diagnosed in 88.5% of cases. For AVNRT diagnosis, r deflection in AVR (sensitivity 90.1%, specificity 100%), r deflection in V1 (sensitivity 90.1%, specificity 100%) and pseudo S wave (sensitivity 86.6%, specificity 100%) predicted AVNRT in 93%, 91% and 85% of cases, respectively. Therefore the presence of r deflection in V1 and aVR leads; and pseudo S wave in the inferior leads were found to be reliable predictors of AVNRT. […] The standard ECG criterion of pseudo r deflection and pseudo S wave is an accurate method of diagnosing AVNRT.

• #1 Atrioventricular nodal reentry tachycardia (AVNRT) | Altru Health System

  https://www.altru.org/health-library/conditions/atrioventricular-nodal-reentry-tachycardia-avnrt

  Atrioventricular nodal reentry tachycardia (AVNRT) is a type of irregular heartbeat, also called an arrhythmia. It is the most common type of supraventricular tachycardia (SVT). […] To diagnose atrioventricular nodal reentry tachycardia (AVNRT), a healthcare professional examines you and asks questions about your symptoms and medical history. The healthcare professional listens to your heart and lungs using a stethoscope. […] Tests used to diagnose atrioventricular nodal reentry tachycardia (AVNRT) may include: Blood tests can check for thyroid disease and other conditions that can cause an irregular heartbeat. Electrocardiogram (ECG or EKG). This simple test checks the electrical activity of the heart. It shows how fast or slow the heart is beating. Holter monitor. This portable ECG device is worn for a day or more to record the heart’s activity during daily activities. A Holter monitor can find irregular or fast heartbeats that dont show up on a regular electrocardiogram. Echocardiogram. Sound waves create pictures of the beating heart. An echocardiogram shows the heart’s size and how blood flows through the heart. Exercise stress tests. These tests often involve walking on a treadmill or riding a stationary bike while the heart activity is watched. Exercise tests show how the heart reacts to physical activity. If you can’t exercise, you might get medicines that affect the heart like exercise does. Electrophysiological study. Also called an EP study, this test can show where in the heart the irregular heartbeat starts. During this test, a doctor guides one or more flexible tubes through a blood vessel, usually in the groin, to various areas in the heart. Sensors on the tips of the tubes record the heart’s electrical signals.

• #1 AVNRT for two • LITFL • ECG Library Diagnosis

  https://litfl.com/avnrt-for-two/

  No visible P-waves (hidden within the QRS complex) or […] P-waves immediately before the QRS or […] P-waves immediately after the QRS complex. […] For recurrent episodes of palpitations, a Holter monitor and EPS may be useful in identifying rhythms typical of AVNRT. An echocardiogram may be useful in evaluating for structural heart disease and electrophysiological studies may be necessary if considering ablative therapy. Blood tests that may be appropriate in patients experiencing palpitations include cardiac markers (to investigate for myocardial infarction), urea and electrolytes (to identify imbalances in potassium, magnesium or calcium) or thyroid function tests (hyperthyroidism may trigger AVNRT or other arrhythmias).

• #1 Atrioventricular nodal reentry tachycardia (AVNRT) | UM Health-Sparrow

  https://www.uofmhealthsparrow.org/departments-conditions/conditions/atrioventricular-nodal-reentry-tachycardia-avnrt

  To diagnose atrioventricular nodal reentry tachycardia (AVNRT), a healthcare professional examines you and asks questions about your symptoms and medical history. The healthcare professional listens to your heart and lungs using a stethoscope. […] Tests are often done to check heart health. […] Tests used to diagnose atrioventricular nodal reentry tachycardia (AVNRT) may include: Blood tests can check for thyroid disease and other conditions that can cause an irregular heartbeat. […] Electrocardiogram (ECG or EKG). This simple test checks the electrical activity of the heart. It shows how fast or slow the heart is beating. […] Holter monitor. This portable ECG device is worn for a day or more to record the heart’s activity during daily activities. A Holter monitor can find irregular or fast heartbeats that dont show up on a regular electrocardiogram.

• #1 Atrioventricular nodal reentry tachycardia (AVNRT)

  https://www.mymlc.com/health-information/diseases-and-conditions/a/atrioventricular-nodal-reentry-tachycardia-avnrt/

  Atrioventricular nodal reentry tachycardia (AVNRT) is the most common type of supraventricular tachycardia. People with AVNRT have episodes of an abnormally fast heartbeat (more than 100 beats per minute) that often start and end suddenly. The episodes are due to an extra pathway — called a reentrant circuit — located in or near the AV node that causes the heart to beat prematurely. […] Tests and procedures used to diagnose AVNRT may include: Blood tests to check thyroid function, heart disease or other conditions that may trigger your abnormal heartbeat, Electrocardiogram (ECG) to measure the electrical activity of your heart and measure the timing and duration of each heartbeat, Holter monitor, which is a portable ECG device designed to record your heart’s activity as you perform your normal everyday activities, Echocardiogram, which uses sound waves to produce images of your heart’s size, structure and motion.

• #1 Atrioventricular Nodal Reentrant Tachycardia (AVNRT): Symptoms, Diagnosis, and Treatment

  https://angolodeldottorino.it/en/Medicine/Cardiology/heart-rhythm-disorders/atrioventricular-nodal-reentrant-tachycardia.php

  The 12-lead electrocardiogram (ECG) represents the primary diagnostic method to distinguish AVNRT from other supraventricular tachycardias. During an episode, the ECG typically shows: Regular rhythm, with a heart rate between 140 and 250 bpm. […] If diagnosis remains uncertain, pharmacological or physiological tests can be conducted to assess AV node involvement. Adenosine is the drug of choice for terminating the arrhythmia and confirming AV node participation in the reentry circuit. […] In patients with recurrent and debilitating episodes or when diagnosis remains unclear despite monitoring, an electrophysiological study (EPS) is the most accurate method to confirm the presence of a reentry circuit within the AV node.

• #1 Atrioventricular Nodal Reentrant Tachycardia

  https://mydoctor.kaiserpermanente.org/mas/structured-content/Condition_AV_Nodal_Reentrant_Tachycardia_-_Cardio_EP.xml?co=/regions/mas

  Atrioventricular nodal reentrant tachycardia (AVNRT) is a disorder of the heart’s electrical system that causes sudden, very rapid heart rate. […] Your doctor may suspect AVNRT if you have symptoms related to abnormally fast heart rhythm (arrhythmia). We use several tests to diagnose AVNRT. […] This is commonly used to measure and record data on the heart’s electrical system and heart rate. We look at electrical signals’ timing and strength and determine whether there’s a steady beat. […] This can be done to assess how well the AV node and electrical system are working. This test involves guiding electrodes through a vein and into the heart. EP testing is necessary to find the location of the electrical problem.

• #1 Atrioventricular nodal reentry tachycardia (AVNRT) // Middlesex Health

  https://middlesexhealth.org/learning-center/diseases-and-conditions/atrioventricular-nodal-reentry-tachycardia-avnrt

  Atrioventricular nodal reentry tachycardia (AVNRT) is a type of irregular heartbeat, also called an arrhythmia. It is the most common type of supraventricular tachycardia (SVT). […] To diagnose atrioventricular nodal reentry tachycardia (AVNRT), a healthcare professional examines you and asks questions about your symptoms and medical history. The healthcare professional listens to your heart and lungs using a stethoscope. […] Tests used to diagnose atrioventricular nodal reentry tachycardia (AVNRT) may include: Blood tests can check for thyroid disease and other conditions that can cause an irregular heartbeat. […] Electrocardiogram (ECG or EKG). This simple test checks the electrical activity of the heart. It shows how fast or slow the heart is beating. […] Holter monitor. This portable ECG device is worn for a day or more to record the heart’s activity during daily activities. A Holter monitor can find irregular or fast heartbeats that dont show up on a regular electrocardiogram.

• #1 Atrioventricular Nodal Reentrant Tachycardia (AVNRT)

  https://my.clevelandclinic.org/health/diseases/22923-avnrt

  Atrioventricular nodal reentrant tachycardia (AVNRT) is a type of arrhythmia. […] AVNRT can affect anyone, is more common in women than men and can even occur in young, otherwise healthy adults. […] To diagnose AVNRT or another arrhythmia, a healthcare provider will perform: […] An electrocardiogram (EKG) measures the electrical activity in the heart, including the timing and duration of each heartbeat. This can be used to help confirm the diagnosis during an acute episode. […] The healthcare provider may also order other tests to assess your heart: […] Electrophysiological (EP) study and cardiac mapping is an invasive procedure that can be used to determine the exact etiology and location of the arrhythmia. […] Many people with AVNRT dont need treatment. But your healthcare team may recommend treatment if you:

• #1 AV nodal reentrant tachycardia: Diagnosis and Treatment – Dermatology Advisor

  https://www.dermatologyadvisor.com/home/decision-support-in-medicine/cardiology/av-nodal-reentrant-tachycardia-diagnosis-and-treatment/

  Once a supraventricular tachycardia has been diagnosed, an EPS can be performed to determine the exact mechanism of the tachycardia and if indicated catheter ablation may be chosen as an option for therapy and cure. […] The differential diagnosis of AVNRT includes other narrow complex tachycardias, such as orthodromic reciprocating tachycardia involving an accessory pathway or ectopic atrial tachycardia, which can be discerned at the time of electrophysiology study. […] In patients who are suspected of having AVNRT, it is important to obtain hard copy documentation of the arrhythmia. This is done ideally with a 12-lead ECG that is taken during the time that the arrhythmia is occurring. […] The immediate management of AVNRT depends on the severity of symptoms and the patients hemodynamics. If there is hypotension and shock, sedation followed by urgent cardioversion according to ACLS guidelines must be performed. […] The management of AVNRT proceeds along two lines of therapy. One is empiric drug therapy and the other is catheter ablation for cure of the arrhythmia once acute management has been addressed.

• #1 Atrioventricular Nodal Reentrant Tachycardia | ECG Stampede

  https://www.ecgstampede.com/glossary/atrioventricular-nodal-reentrant-tachycardia/

  Atrioventricular nodal reentrant tachycardia (AVNRT) is caused by a reentrant loop within the atrioventricular node. […] The differential for a regular, narrow complex tachycardia includes sinus tachycardia, atrioventricular nodal reentrant tachycardia (AVNRT), atrioventricular reentrant tachycardia (AVRT), atrial flutter, and atrial tachycardia. […] P waves can aid the diagnosis but are often absent. […] While most cases of AVNRT do not have visible P waves, up to one third of AVNRT cases will show retrograde P waves immediately following the QRS complex, giving the appearance of a pseudo-S wave in the inferior limb leads, or a pseudo-R wave in V1. […] Typical atrioventricular nodal reentrant tachycardia conducts down the slow pathway and up the fast pathway all within the node, and retrograde P waves can occasionally be seen immediately following the QRS complex.

• #1 Establishing the Mechanism of Supraventricular Tachycardia in the Electrophysiology Laboratory

  https://www.innovationsincrm.com/cardiac-rhythm-management/2013/april/430-supraventricular-tachycardia-in-the-electrophysiology-laboratory

  Supraventricular tachycardia (SVT) is a common disorder, affecting 570,000 people each year. […] The vast majority of SVTs are one of three types of arrhythmia, atrioventricular nodal re-entrant tachycardia or AVNRT (responsible for approximately 65% of cases), atrioventricular reciprocating tachycardia or AVRT (responsible for approximately 30% of cases), and atrial tachycardia or AT (responsible for approximately 5% of cases). […] Before radiofrequency ablation can be performed, however, an electrophysiologic study should be performed to correctly diagnose the mechanism of the SVT. […] The demonstration of dual AV nodal physiology during electrophysiology study has a positive predictive value of 86% for AVNRT as the mechanism of the tachycardia. […] Termination of the tachycardia with the development of AV block (spontaneous or induced by vagal maneuvers or AV nodal blocking medications) favors the diagnosis of the AV nodal-dependent tachycardias, AVNRT or AVRT.

• #1 Atrioventricular nodal re-entrant tachycardia with a 2:1 atrioventricular block in a young man: What is the mechanism? | International Journal of Arrhythmia | Full Text

  https://arrhythmia.biomedcentral.com/articles/10.1186/s42444-024-00114-9

  Atrioventricular nodal re-entrant tachycardia (AVNRT) has different forms of presentation, where the slow-fast type, with a 1:1 atrioventricular (AV) ratio, is the most common. […] The case described is compatible with a typical slow-fast AVNRT with 2:1 AV block. Current evidence suggests the presence of a functional block; however, two questions arise: at what level and why does the block occur? […] The mechanism of AVNRT with 2:1 AV block may be due to the presence of a lower common pathway or an intrahisian block. The longshort activation sequence phenomenon and the change in AV ratio from 2:1 to 1:1 with continuous programmed ventricular stimulation, suggest a functional phase 3 block at the HB (intrahisian). The absence of HB potential in blocked beats is probably because a small initial HB portion depolarized that produces an unrecognizable low voltage potential in the intracavitary registry.

• #1 AVNRT: AV Nodal Reentrant Tachycardia – The Cardiology Advisor

  https://www.thecardiologyadvisor.com/ddi/avnrt-av-nodal-reentrant-tachycardia/

  AV nodal reentrant tachycardia originates in the AV node. It is due to the presence of an electrical signal pathway called a reentry circuit in the AV node. Patients with AVNRT have 2 functional AV nodal pathways that conduct impulses at different rates and usually are referred to as fast and slow. The 3 primary types of AVNRT can be categorized by the anatomy of the reentry circuit as follows: Slow-fast AVNRT is defined by antegrade (forward-moving) conduction moving through the slow AV nodal pathway and retrograde (backward-moving) conduction moving through the fast pathway. This is the most common type of AVNRT. Fast-slow AVNRT is defined by the reverse pattern (antegrade conduction through the fast pathway and retrograde conduction through the slow pathway). This is a less common type of AVNRT. Slow-slow AVNRT occurs when both anterograde and retrograde conduction move through slow pathways. This is a rare type of AVNRT.

• #1 Classification, Electrophysiological Features and Therapy of Atrioventricular Nodal Reentrant Tachycardia | AER Journal

  https://www.aerjournal.com/articles/classification-electrophysiological-features-and-therapy-atrioventricular-nodal-reentrant?language_content_entity=en

  Atrioventricular nodal reentrant tachycardia (AVNRT) should be classified as typical or atypical. […] Retrograde atrial activation during tachycardia should not be relied upon as a diagnostic criterion. […] When the diagnosis of AVNRT is established, ablation should be only directed towards the anatomic position of the slow pathway. […] In this review we discuss current concepts about the tachycardia circuit, electrophysiologic diagnosis, and ablation of this arrhythmia. […] The distinction between fast-slow and slow-slow atypical AVNRT is often arbitrary in view of the lack of a unanimously accepted definition. […] In order to establish the diagnosis of a truly fast-slow form, it has been proposed that the AH interval should be less than 185 ms or 200 ms. […] Thus, tachycardias with a relatively prolonged AH interval but an AH/ HA ratio 1 cannot be reliably classified as either fast-slow or slow-slow.

• #1 Establishing the Mechanism of Supraventricular Tachycardia in the Electrophysiology Laboratory

  https://www.innovationsincrm.com/cardiac-rhythm-management/2013/april/430-supraventricular-tachycardia-in-the-electrophysiology-laboratory

  A sudden increase in the AH or VH interval with the delivery of a slightly decrementing single extrastimulus implies the presence of dual AV nodal pathways and is strongly suggestive of AVNRT as the mechanism of the SVT with a PPV of 91%. […] If the tachycardia continues during development of VA block, AVRT as the mechanism of the tachycardia is excluded because of the need for ventricular participation. […] Development of left bundle branch block (BBB) favors the diagnosis of AVRT with a positive predictive value of 92%. […] A PVC delivered during the tachycardia (but not in a His-synchronous fashion) can potentially affect the tachycardia either by pre-exciting, post-exciting, or terminating it and can be used to calculate a measurement known as the pre-excitation index (PI). […] A His-refractory APC that pre-excites the next His terminates the tachycardia or post-excites the next His is consistent with the AVNRT. […] A difference greater than 85 ms supports the diagnosis of AVNRT as the mechanism of tachycardia.

• #1 Atrioventricular Nodal Reentry Tachycardia – StatPearls – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK499936/

  The most significant component of the assessment for a patient who presents with signs and symptoms of atrioventricular nodal reentrant tachycardia is a history and physical exam. These should include vital signs (respiratory rate, blood pressure, temperature, and heart rate) and an electrocardiogram. A patient presenting with AVNRT should undergo evaluation for any unknown underlying coronary artery disease or heart failure. […] Management of patients presenting with atrioventricular nodal reentry tachycardia begins with an initial evaluation of their hemodynamic stability. Hemodynamically unstable patients present with tachycardia associated with hypotension, ischemic chest pain, altered mental status, respiratory failure, or shock. These patients need their AVNRT terminated electrically with an urgent electrical cardioversion. Hemodynamically stable patients should be treated first with vagal maneuvers to cease the rhythm acutely.

• #1 AV nodal reentrant tachycardia: Diagnosis and Treatment

  https://www.flheartbeat.com/conditions/av-nodal-reentry/

  AV Nodal Reentrant Tachycardia or AVNRT is the second most common supraventricular tachycardia or SVT, after Atrial Fibrillation (Afib) meaning that it causes a fast heart rhythm above the ventricles. […] AVNRT typically affects people in their 30s or 40s and rarely affects children or adolescents. […] AVNRT is considered a paroxysmal or occasional arrhythmia, meaning that it is sporadic and temporary. […] Many patients will experience symptoms like other SVTs including fast heartbeat or palpitations dizziness or lightheadedness, inability to exercise as before, weakness and fatigue chest pain or discomfort, and more. […] There are several treatments for AVNRT, depending on the severity of symptoms and how often it occurs. […] The first step is to speak to a qualified electrophysiologist to understand your treatment options for AVNRT.

• #1 Atrioventricular Nodal Reentry Tachycardia | Treatment & Management | Point of Care

  https://www.statpearls.com/point-of-care/17974

  Management of patients presenting with atrioventricular nodal reentry tachycardia begins with an initial evaluation of their hemodynamic stability. Hemodynamically unstable patients present with tachycardia associated with hypotension, ischemic chest pain, altered mental status, respiratory failure, or shock. These patients need their AVNRT terminated electrically with an urgent electrical cardioversion. Hemodynamically stable patients should be treated first with vagal maneuvers to cease the rhythm acutely. […] IV adenosine terminates approximately 80% of AVNRT arrhythmias. Patients in whom medical treatment and Valsalva maneuvers fail or those who cannot tolerate medication due to its side effects might opt for catheter ablation as a one-time definitive cure. Catheter ablations in patients with AVNRT have a high success rate, reported to be as high as 95%. […] Prognosis is generally good when a healthcare provider promptly identifies the rhythm. […] If not identified promptly, symptomatic complications such as syncope, fatigue, or dizziness can occur.

• #1 Atrioventricular Nodal Reentrant Tachycardia – Core EM

  https://coreem.net/core/avnrt/

  AVNRT is a common tachydysrhythmia that results from a reentrant loop within the AV node. […] Unstable patients with AVNRT should be considered for immediate synchronized electrical cardioversion. […] Stable patients with AVNRT can have a trial of vagal maneuvers followed by chemical cardioversion with adenosine or verapamil and synchronized electrical cardioversion if that fails.

• #1 Diagnosis and treatment of atrioventricular nodal reentrant tachycardia: a case report illustrating clinical management and ablation strategy

  https://pmc.ncbi.nlm.nih.gov/articles/PMC7501927/

  Atrioventricular nodal reentrant tachycardia (AVNRT) is a common supraventricular arrhythmia that is frequently encountered in an otherwise healthy patient population. […] The ablation strategy in these patients is illustrated based on intracardiac recordings in combination with per-procedural three-dimensional imaging. […] Catheter ablation should be considered early as it can be performed safely and with a very high success rate. […] Atrioventricular nodal reentrant tachycardia (AVNRT) is an arrhythmia frequently encountered in an otherwise healthy patient population. […] Catheter ablation should be considered as an initial treatment choice in symptomatic patients with AVNRT, given the high success rate and low risk for complications. […] Ablation is typically performed in the slow pathway region corresponding to the rightward inferior extension of the atrioventricular (AV) node.

• #1 Atrioventricular Nodal Reentry Tachycardia: Background, Etiology, Epidemiology

  https://emedicine.medscape.com/article/160215-overview

  In patients with AVNRT, two pathways connect into the AV node and help form part of the reentrant circuit. […] In the majority of patients with AVNRT, antegrade conduction occurs over the slow pathway, and retrograde conduction occurs over the fast pathway during AVNRT. […] In most patients with AVNRT, the tachycardia is initiated when an atrial premature complex is blocked in the fast pathway but can conduct via the slow pathway. […] The prognosis for patients with atrioventricular nodal reentry tachycardia (AVNRT) is usually good in the absence of structural heart disease. Most patients respond acutely to vagal maneuvers or adenosine and long term to medications to prevent recurrence or to radiofrequency ablation, which is approximately 95% curative and has a low risk of complications. It is the preferred method of treatment for most patients. […] Complications of AVNRT include hemodynamic compromise, congestive heart failure, syncope, tachycardia-induced angina, cardiomyopathy, myocardial ischemia, and myocardial infarction.

• #1 Atrioventricular Nodal Reentrant Tachycardia (AVNRT) – Causes, Symptoms, Diagnosis, and Treatment

  https://www.myfastheart.com/conditions-treatment/atrioventricular-nodal-reentrant-tachycardia-avnrt/

  Atrioventricular Nodal Reentrant Tachycardia (AVNRT) causes fast beating of the heart, or arrhythmia. […] AVNRT is considered a paroxysmal supraventricular tachycardia (SVT) which means that it is not persistent, involves the upper chambers of the heart and causes an abnormally fast heartbeat. […] Because of the sporadic nature of the condition, it can be hard to diagnose AVNRT at an office consultation. The most definitive way to diagnose the condition is a 12 lead ECG while the patient is in the abnormal rhythm, such as during an ER visit. Should the fast heart rate from AVNRT not be present during the ECG recording, such as may occur during an initial cardiology or electrophysiology office consultation, it would not be possible to diagnose AVNRT at that time. […] A catheter based test of the electrical system, known as an electrophysiology study, may also lead to a definitive diagnosis.

• #1 Pathophysiology, Diagnosis, and Ablation of Atrioventricular Node–dependent Long-R–P Tachycardias

  https://www.innovationsincrm.com/cardiac-rhythm-management/articles-2020/march/1546-atrioventricular-node-dependent-long-r-p-tachycardias

  Atrioventricular (AV) nodedependent long-RP tachycardias are a unique group of supraventricular tachycardias that include atypical AV nodal reentrant tachycardia (AVNRT), atypical AVNRT with a concealed bystander nodofascicular (NF)/nodoventricular (NV) accessory pathway inserting into the slow pathway of the AV node, the permanent form of junctional reciprocating tachycardia, and orthodromic NF/NV reciprocating tachycardia. Here, we discuss the complex pathophysiology, diagnosis, and ablation of these intriguing arrhythmias. […] Classic atypical (fastslow) AVNRT is the most common AV nodedependent long-RP tachycardia. It utilizes the fast pathway (FP) and SP of the AV node as the antegrade and retrograde limbs of the reentrant circuit, respectively, and its nonmacroreentrant circuit is confined to the AV node and its atrionodal inputs.

• #1 Classification, Electrophysiological Features and Therapy of Atrioventricular Nodal Reentrant Tachycardia | AER Journal

  https://www.aerjournal.com/articles/classification-electrophysiological-features-and-therapy-atrioventricular-nodal-reentrant?language_content_entity=en

  Thus, catheter ablation is the current treatment of choice. […] Slow pathway ablation or modification is effective in both typical and atypical AVNRT. […] This approach offers a success rate of 95 %, is associated with a risk of 0.51 % AV block and has approximately 4 % recurrence rate. […] Advanced age is not a contraindication for slow pathway ablation. […] The preexistence of first-degree heart block may carry a higher risk for late AV block and slow pathway modification, as opposed to complete elimination, is probably preferable in this setting.

• #1 Diagnosis and treatment of atrioventricular nodal reentrant tachycardia: a case report illustrating clinical management and ablation strategy

  https://pmc.ncbi.nlm.nih.gov/articles/PMC7501927/

  In patients with recurrent symptomatic episodes of AVNRT, there is a good and clear indication for catheter ablation, which can be performed with a high success rate (97%) and a very low risk of complications. […] The current case illustrates the most common subform of AVNRT, where antegrade conduction occurs over the slow pathway and retrograde conduction over the fast pathway (slow/fast AVNRT or typical AVNRT). […] The risk of periprocedural AV block can be minimized by avoiding ablation near the His-bundle and compact AV node. […] Rather than moving the ablation catheter higher up to the mid-septum if slow pathway conduction cannot be eliminated from the right posteroseptal area, a left-sided approach is recommended to eliminate slow pathway conduction by targeting the leftward inferior extension of the AV node.

• #1 Atrioventricular nodal reentry tachycardia (AVNRT) – Diagnosis and treatment – Mayo Clinic

  https://www.mayoclinic.org/diseases-conditions/avnrt/diagnosis-treatment/drc-20573853

  For atrioventricular nodal reentry tachycardia (AVNRT), some questions to ask your healthcare professional include: What tests do I need? […] Most people with atrioventricular nodal reentry tachycardia (AVNRT) don’t need treatment. But if the fast heartbeat happens often or lasts a long time, treatment may be needed.

• #1 Atrioventricular nodal reentry tachycardia, or AVNRT in endurance athletes? – Triathlon Forum – Slowtwitch Forum

  https://forum.slowtwitch.com/t/atrioventricular-nodal-reentry-tachycardia-or-avnrt-in-endurance-athletes/1281181

  AVNRT is one of several re-entrant atrial dysthymias. What this means is that the rhythm originates in atrium, and the heart rate is transmitted to the ventricles. This is in distinction with ventricular tachycardia, which is a potentially lethal rhythm if it degenerates. The rhythm is typically precipitated by a premature beat which falls at just the right time in the cardiac cycle that a self-perpetuating rhythm sets up. As others have noticed, it typically has a very high rate, sometimes north of 200bpm. With this you may feel lightheaded or dizzy because the heart has very little time to fill, so each heart beat ejects only a little blood, resulting in low blood pressure or poor perfusion of your head. It typically has a very abrupt onset, and offset as well. It is susceptible to maneuvers that increase the tone of your vagal nerve (in charge of slowing your heart). These maneuvers are things like bearing down (valsalva), carotid massage (be very careful with this), and others. The more frequent you have this rhythm and the longer it goes, the harder and more resistant to conversion it becomes.

• #1 Atrioventricular Nodal Reentry Tachycardia – StatPearls – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK499936/

  First-line medical therapy is IV adenosine, administered up to 18 mg given in increments of 6 mg in the absence of contraindications such as severe bronchospastic lung disease or severe coronary artery disease. […] IV adenosine terminates approximately 80% of AVNRT arrhythmias. Patients in whom medical treatment and Valsalva maneuvers fail or those who cannot tolerate medication due to its side effects might opt for catheter ablation as a one-time definitive cure. Catheter ablations in patients with AVNRT have a high success rate, reported to be as high as 95%.

• #2 AV nodal reentrant tachycardia: Diagnosis and Treatment – Dermatology Advisor

  https://www.dermatologyadvisor.com/home/decision-support-in-medicine/cardiology/av-nodal-reentrant-tachycardia-diagnosis-and-treatment/

  Atrioventricular nodal reentrant tachycardia (AVNRT) is the most common form of paroxysmal supraventricular tachycardia (PSVT) encountered in clinical practice. It is responsible for approximately 60% to 70% of the paroxysmal forms of PSVT. […] The history and 12-lead ECG are paramount in determining the diagnosis of AVNRT. Almost all of the patients who have this diagnosis will elicit one or more of the symptoms described above. It is important to obtain a 12-lead ECG at the time of presentation. […] The ECG typically reveals a regular narrow complex tachycardia at rates of 120 to 240 beats per minute. […] The most common form of AVNRT, the so-called typical AVNRT or slow-fast AVNRT, comprises over 95 % of cases of AVNRT. […] In the typical form of AVNRT, a PAC is often seen as the initiating event followed by a prolonged PR interval and the onset of the tachycardia. A regular narrow complex tachycardia then ensues at 120 to 240 bpm.

• #2 Atrioventricular Nodal Reentry Tachycardia – StatPearls – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK499936/

  The most significant component of the assessment for a patient who presents with signs and symptoms of atrioventricular nodal reentrant tachycardia is a history and physical exam. These should include vital signs (respiratory rate, blood pressure, temperature, and heart rate) and an electrocardiogram. A patient presenting with AVNRT should undergo evaluation for any unknown underlying coronary artery disease or heart failure. […] Management of patients presenting with atrioventricular nodal reentry tachycardia begins with an initial evaluation of their hemodynamic stability. Hemodynamically unstable patients present with tachycardia associated with hypotension, ischemic chest pain, altered mental status, respiratory failure, or shock. These patients need their AVNRT terminated electrically with an urgent electrical cardioversion. Hemodynamically stable patients should be treated first with vagal maneuvers to cease the rhythm acutely.

• #2 Atrioventricular Nodal Reentry Tachycardia Differential Diagnoses

  https://emedicine.medscape.com/article/160215-differential

  Automatic or triggered atrial tachycardia generally looks distinctly different, but it may have similar features to typical atrioventricular nodal reentry tachycardia (AVNRT) if it originates in the low atrial septal area and if 1:1 conduction occurs. […] New-onset AVNRT has been observed after radiofrequency ablation involving the septum or proximal coronary sinus, which appears to indicate connections between the posteroseptal left atrium and the coronary sinus are essential for certain forms of AVNRT. […] Another potentially distinguishing factor in AVNRT is the sensation of neck pulsations. This is more common in AVNRT, as there is simultaneous atrial and ventricular activation and contraction. […] Typical atrioventricular nodal (AV) reentry tachycardia. In this electrocardiogram, the P wave appears immediately after or just within the QRS complex. Often a pseudo R wave is seen in lead V1 and a pseudo S wave in leads II, III, aVF. The retrograde P wave represents retrograde activation via the fast pathway, which is anterior septal and superior to the AV node. […] Orthodromic AV-reciprocating tachycardia (AVRT) tends to occur at an earlier age and more frequently in males than AVNRT. […] Women tend to have a greater risk for AVNRT than for AVRT, but there is, nevertheless, a large overlap in the incidence of both conditions by age and sex.

• #2 AV nodal reentrant tachycardia – Wikipedia

  https://en.wikipedia.org/wiki/AV_nodal_reentrant_tachycardia

  AV-nodal reentrant tachycardia (AVNRT) is a type of abnormal fast heart rhythm. […] The main symptom is palpitations. […] AVNRT occurs when a reentrant circuit forms within or just next to the atrioventricular node. […] If the symptoms are present while the person is receiving medical care (e.g., in an emergency department), an ECG may show typical changes that confirm the diagnosis i.e., QRS duration 120 ms, unless a heart block is suspected. […] If the palpitations are recurrent, a doctor may request a Holter monitor (portable, wearable ECG recorder). […] All these ECG-based technologies also enable the distinction between AVNRT and other abnormal fast heart rhythms such as atrial fibrillation, atrial flutter, sinus tachycardia, ventricular tachycardia and tachyarrhythmias related to Wolff-Parkinson-White syndrome, all of which may have symptoms that are similar to AVNRT.

• #2 AVNRT: AV Nodal Reentrant Tachycardia – The Cardiology Advisor

  https://www.thecardiologyadvisor.com/ddi/avnrt-av-nodal-reentrant-tachycardia/

  It can be difficult to differentiate AVNRT from other forms of narrow-complex tachycardia, particularly atrial tachycardia and AV reentrant tachycardia due to a concealed accessory pathway. An electrophysiology study may be useful for differentiating these forms of SVT. […] Evaluation of a patient with suspected AVNRT typically begins with a 12-lead electrocardiogram (ECG). The duration of ECG monitoring required depends on the frequency of symptoms. A Holter ambulatory monitor can be used if the patient experiences frequent episodes of arrhythmia that are likely to be detected by 24 to 48 hours of monitoring. A continuous loop event recorder, which can be worn for up to 1 month and activated by the patient when they experience symptoms, may be a better option for those who experience less frequent episodes. Electrocardiogram typically shows regular, narrow-complex tachycardia (QRS complex 120 milliseconds) at 140 to 280 bpm. P waves may not be visible because they are buried in the QRS complex. Pseudo R waves may be seen in leads V1 or V2, or pseudo S waves in leads II, III, or aVF. These pseudo waves indicate that the P waves are buried in the QRS complex.

• #2 AVNRT for two • LITFL • ECG Library Diagnosis

  https://litfl.com/avnrt-for-two/

  No visible P-waves (hidden within the QRS complex) or […] P-waves immediately before the QRS or […] P-waves immediately after the QRS complex. […] For recurrent episodes of palpitations, a Holter monitor and EPS may be useful in identifying rhythms typical of AVNRT. An echocardiogram may be useful in evaluating for structural heart disease and electrophysiological studies may be necessary if considering ablative therapy. Blood tests that may be appropriate in patients experiencing palpitations include cardiac markers (to investigate for myocardial infarction), urea and electrolytes (to identify imbalances in potassium, magnesium or calcium) or thyroid function tests (hyperthyroidism may trigger AVNRT or other arrhythmias).

• #2 Atrioventricular nodal reentry tachycardia (AVNRT) | UM Health-Sparrow

  https://www.uofmhealthsparrow.org/departments-conditions/conditions/atrioventricular-nodal-reentry-tachycardia-avnrt

  Echocardiogram. Sound waves create pictures of the beating heart. An echocardiogram shows the heart’s size and how blood flows through the heart. […] Exercise stress tests. These tests often involve walking on a treadmill or riding a stationary bike while the heart activity is watched. Exercise tests show how the heart reacts to physical activity. If you can’t exercise, you might get medicines that affect the heart like exercise does. […] Electrophysiological study. Also called an EP study, this test can show where in the heart the irregular heartbeat starts. During this test, a doctor guides one or more flexible tubes through a blood vessel, usually in the groin, to various areas in the heart. Sensors on the tips of the tubes record the heart’s electrical signals.

• #2 Atrioventricular nodal reentry tachycardia (AVNRT)

  https://www.mymlc.com/health-information/diseases-and-conditions/a/atrioventricular-nodal-reentry-tachycardia-avnrt/

  Your doctor might also try to trigger an episode with other tests, which may include: Stress test, which is typically done on a treadmill or stationary bicycle while your heart activity is monitored, Electrophysiological study and cardiac mapping, which allow your doctor to see the precise location of the irregular heartbeat (arrhythmia).

• #2 Diagnosis and treatment of atrioventricular nodal reentrant tachycardia: a case report illustrating clinical management and ablation strategy

  https://pmc.ncbi.nlm.nih.gov/articles/PMC7501927/

  Atrioventricular nodal reentrant tachycardia (AVNRT) is a common supraventricular arrhythmia that is frequently encountered in an otherwise healthy patient population. […] The ablation strategy in these patients is illustrated based on intracardiac recordings in combination with per-procedural three-dimensional imaging. […] Catheter ablation should be considered early as it can be performed safely and with a very high success rate. […] Atrioventricular nodal reentrant tachycardia (AVNRT) is an arrhythmia frequently encountered in an otherwise healthy patient population. […] Catheter ablation should be considered as an initial treatment choice in symptomatic patients with AVNRT, given the high success rate and low risk for complications. […] Ablation is typically performed in the slow pathway region corresponding to the rightward inferior extension of the atrioventricular (AV) node.

• #2 Atrioventricular nodal reentry tachycardia (AVNRT) // Middlesex Health

  https://middlesexhealth.org/learning-center/diseases-and-conditions/atrioventricular-nodal-reentry-tachycardia-avnrt

  Electrophysiological study. Also called an EP study, this test can show where in the heart the irregular heartbeat starts. During this test, a doctor guides one or more flexible tubes through a blood vessel, usually in the groin, to various areas in the heart. Sensors on the tips of the tubes record the heart’s electrical signals.

• #2 Atrioventricular Nodal Reentrant Tachycardia | ECG Stampede

  https://www.ecgstampede.com/glossary/atrioventricular-nodal-reentrant-tachycardia/

  This patient converted with adenosine helping to confirm the diagnosis of atrioventricular tachycardia. […] Most textbooks report that the lower rate limit of supraventricular tachycardia is 140 to 150 bpm, but this is not anecdotally true as this case demonstrates. […] Retrograde P waves are seen immediately following the QRS complexes in leads V1 and II, and appear like pseudo-R and pseudo-S waves, respectively.

• #2 Establishing the Mechanism of Supraventricular Tachycardia in the Electrophysiology Laboratory

  https://www.innovationsincrm.com/cardiac-rhythm-management/2013/april/430-supraventricular-tachycardia-in-the-electrophysiology-laboratory

  A sudden increase in the AH or VH interval with the delivery of a slightly decrementing single extrastimulus implies the presence of dual AV nodal pathways and is strongly suggestive of AVNRT as the mechanism of the SVT with a PPV of 91%. […] If the tachycardia continues during development of VA block, AVRT as the mechanism of the tachycardia is excluded because of the need for ventricular participation. […] Development of left bundle branch block (BBB) favors the diagnosis of AVRT with a positive predictive value of 92%. […] A PVC delivered during the tachycardia (but not in a His-synchronous fashion) can potentially affect the tachycardia either by pre-exciting, post-exciting, or terminating it and can be used to calculate a measurement known as the pre-excitation index (PI). […] A His-refractory APC that pre-excites the next His terminates the tachycardia or post-excites the next His is consistent with the AVNRT. […] A difference greater than 85 ms supports the diagnosis of AVNRT as the mechanism of tachycardia.

• #2 Classification, Electrophysiological Features and Therapy of Atrioventricular Nodal Reentrant Tachycardia | AER Journal

  https://www.aerjournal.com/articles/classification-electrophysiological-features-and-therapy-atrioventricular-nodal-reentrant?language_content_entity=en

  Furthermore, the term fast-slow implies that the fast component of slow-fast AVNRT is the same as the fast in the fast-slow type. […] There is now evidence that this is not the case in patients who present with both types of tachycardia. […] Typical slow-fast and atypical fast-slow AVNRT appear to utilise different anatomical pathways for fast conduction. […] The ventriculo-atrial (VA) interval is also a practical and easily obtainable criterion, when the His bundle potential cannot be reproducibly and reliably recorded during tachycardia. […] As discussed later, retrograde atrial activation sequence or demonstration of a lower common pathway, should not be necessarily considered as reliable criteria for classification of AVNRT types. […] Chronic administration of antiarrhythmic drugs (such as -blockers, non-dihydropyridine calcium channel blockers, flecainide or propafenone) may be ineffective in up to 50 % of cases.

• #2 Atrioventricular Nodal Reentry Tachycardia – StatPearls – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK499936/

  First-line medical therapy is IV adenosine, administered up to 18 mg given in increments of 6 mg in the absence of contraindications such as severe bronchospastic lung disease or severe coronary artery disease. […] IV adenosine terminates approximately 80% of AVNRT arrhythmias. Patients in whom medical treatment and Valsalva maneuvers fail or those who cannot tolerate medication due to its side effects might opt for catheter ablation as a one-time definitive cure. Catheter ablations in patients with AVNRT have a high success rate, reported to be as high as 95%.

• #2 Atrioventricular Nodal Reentry Tachycardia | Treatment & Management | Point of Care

  https://www.statpearls.com/point-of-care/17974

  Atrioventricular nodal reentrant tachycardia (AVNRT) is a type of paroxysmal supraventricular tachycardia that results due to the presence of a reentry circuit within or adjacent to the AV node. The diagnosis of AVNRT requires visualization on an electrocardiogram (ECG). In most cases, an ECG will show heart rate between 140 and 280 beats per minute (bpm), and in the absence of aberrant conduction, a QRS complex of fewer than 120 milliseconds. […] The most significant component of the assessment for a patient who presents with signs and symptoms of atrioventricular nodal reentrant tachycardia is a history and physical exam. These should include vital signs (respiratory rate, blood pressure, temperature, and heart rate) and an electrocardiogram. A patient presenting with AVNRT should undergo evaluation for any unknown underlying coronary artery disease or heart failure.

• #2 Atrioventricular Nodal Reentry Tachycardia | Treatment & Management | Point of Care

  https://www.statpearls.com/point-of-care/17974

  Management of patients presenting with atrioventricular nodal reentry tachycardia begins with an initial evaluation of their hemodynamic stability. Hemodynamically unstable patients present with tachycardia associated with hypotension, ischemic chest pain, altered mental status, respiratory failure, or shock. These patients need their AVNRT terminated electrically with an urgent electrical cardioversion. Hemodynamically stable patients should be treated first with vagal maneuvers to cease the rhythm acutely. […] IV adenosine terminates approximately 80% of AVNRT arrhythmias. Patients in whom medical treatment and Valsalva maneuvers fail or those who cannot tolerate medication due to its side effects might opt for catheter ablation as a one-time definitive cure. Catheter ablations in patients with AVNRT have a high success rate, reported to be as high as 95%. […] Prognosis is generally good when a healthcare provider promptly identifies the rhythm. […] If not identified promptly, symptomatic complications such as syncope, fatigue, or dizziness can occur.

• #2 AV Nodal Reentrant Tachycardia: Causes, Symptoms, and TreatmentHealthline

  https://www.healthline.com/health/arrhythmia/av-nodal-reentrant-tachycardia

  These diagnostic tests will also help a doctor rule out other possible causes of your symptoms, such as coronary artery disease and heart failure. […] An ECG can help a doctor measure the electrical activity in your heart. […] It may confirm that you have AVNRT if your heart rate is 140 to 280 beats per minute, along with a QRS complex of less than 120 milliseconds. […] The overall outlook for people with AVNRT is positive, particularly with early diagnosis and treatment. […] A delayed diagnosis may increase your risk of complications. […] Ongoing treatment is key to regulating AVNRT and preventing complications. […] Consider speaking with a doctor if you have unexplained episodes of an extremely high heart rate without any known underlying medical conditions.

• #2 Diagnosis and treatment of atrioventricular nodal reentrant tachycardia: a case report illustrating clinical management and ablation strategy

  https://pmc.ncbi.nlm.nih.gov/articles/PMC7501927/

  In patients with recurrent symptomatic episodes of AVNRT, there is a good and clear indication for catheter ablation, which can be performed with a high success rate (97%) and a very low risk of complications. […] The current case illustrates the most common subform of AVNRT, where antegrade conduction occurs over the slow pathway and retrograde conduction over the fast pathway (slow/fast AVNRT or typical AVNRT). […] The risk of periprocedural AV block can be minimized by avoiding ablation near the His-bundle and compact AV node. […] Rather than moving the ablation catheter higher up to the mid-septum if slow pathway conduction cannot be eliminated from the right posteroseptal area, a left-sided approach is recommended to eliminate slow pathway conduction by targeting the leftward inferior extension of the AV node.

• #2 Pathophysiology, Diagnosis, and Ablation of Atrioventricular Node–dependent Long-R–P Tachycardias

  https://www.innovationsincrm.com/cardiac-rhythm-management/articles-2020/march/1546-atrioventricular-node-dependent-long-r-p-tachycardias

  Slow, decremental conduction over the SP/AP brings into focus unique challenges for the diagnosis of long-RP tachycardias that are not encountered in relation with short-RP counterparts. […] Critical to a long-RP tachycardia diagnosis is establishing the retrograde limb of the circuitthat is, SP (AVNRT), AV AP (PJRT), or NF/NV APSP (NFRT/NVRT). His-refractory VPDs are the maneuver of choice to identify the presence of an AP. […] The target ablation site depends upon the mechanism of tachycardia and, therefore, it is critical to establish the exact diagnosis (eg, upper and lower limbs of the circuit). Conventional SP ablation during sinus rhythm targeting the SP or NF/NV APSP can effectively treat atypical AVNRT and NFRT/NVRT. […] The AV node-dependent long-RP tachycardias impose unique diagnostic challenges because of the slow, decremental AP properties and unusual insertion sites in both the SP and RB. Conventional SVT criteria for short-RP tachycardias are not always applicable for long-RP tachycardias. The delivery of His-refractory VPDs is the most useful technique for identifying the presence of an AP, but both atrial and ventricular pacing maneuvers are required to accurately delineate the upper and lower limbs of the circuit.

• #2 Atrioventricular nodal reentry tachycardia, or AVNRT in endurance athletes? – Triathlon Forum – Slowtwitch Forum

  https://forum.slowtwitch.com/t/atrioventricular-nodal-reentry-tachycardia-or-avnrt-in-endurance-athletes/1281181

  This type of condition is impossible to diagnose without an ECG that happens to catch it when it takes off. In most cases a multi-day ECG is necessary. These are pretty benign, you wear ECG leads and a device the size of a phone that records any symptoms. To formally and rigorously diagnose and treat it, an invasive catheter based electrophysiology study is done. […] You need to contact a cardiologist, specifically an electrophysiologist to work this up. There are numerous other rhythm issues besides AVNRT that could be causing your symptoms. […] I had an ablation to fix my SVT (AVNRT). I would have very brief bouts of 220bpm during my runs. The electrophysiologist said I can live with it if I want or I can do the ablation since its affecting my training and racing. I did the ablation 3 years ago and havent had a problem since. I was told that AVNRT is the easiest rhythm to ablate with a 90% success rate on one try. Compare that to atrial fibrillation where it can take numerous tries. […] Your symptoms sound like they could be either SVT or Afib. They will most likely have you wear a temporary heart monitor for an extended period of time. Try to induce your symptoms while you are wearing it.

• #3 Atrioventricular Nodal Reentry Tachycardia (AVNRT)

  https://www.healio.com/cardiology/learn-the-heart/cardiology-review/topic-reviews/atrioventricular-nodal-reentry-tachycardia-avnrt

  Atrioventricular nodal reentry tachycardia, a form of supraventricular tachycardia, is the most common narrow-complex tachycardic arrhythmia in healthy individuals and only second to atrial fibrillation and atrial flutter in the general population. […] Atrioventricular nodal reentry tachycardia (AVNRT) occurs when there is „dual AV nodal physiology” or a „dual AV node.” This means there is one pathway that conducts slowly within the AV node and another that conducts quickly. A premature atrial contraction (PAC) or premature ventricular contraction (PVC) can alter the normal conduction cycle to produce a reentrant circuit within these two pathways, resulting in the tachycardia. […] Diagnosis is made on the 12-lead ECG. Findings include a narrow complex tachycardia, a P wave that occurs after the QRS complex (a short RP interval) and termination with adenosine or carotid massage.

• #3 Atrioventricular Nodal Reentrant Tachycardia (AVNRT) – Supraventricular Tachycardias – Supraventricular Arrhythmias – Cardiac Arrhythmias – Cardiovascular Diseases – Diseases – McMaster Textbook of Internal Medicine

  https://empendium.com/mcmtextbook/chapter/B31.II.2.6.2.

  Atrioventricular nodal reentrant tachycardia (AVNRT) is a paroxysmal tachycardia that occurs in patients with dual atrioventricular (AV) node physiology, as they have both a fast nodal pathway with a longer refractory period and a slow nodal pathway with a shorter refractory period. It is most commonly observed in individuals with no underlying structural heart disease. […] AVNRT usually occurs in young patients, causing paroxysmal palpitations that abruptly start and stop. The palpitations are usually relatively well tolerated, as no concomitant structural heart disease is found and the heart rates are usually 170 to 180 beats/min. Patients may describe a sensation of rapid regular pounding in the neck during tachycardia. The attacks may be frequent (up to several a day) and may require emergency care.

• #3 Atrioventricular Nodal Reentrant Tachycardia | ECG Stampede

  https://www.ecgstampede.com/glossary/atrioventricular-nodal-reentrant-tachycardia/

  Atrioventricular nodal reentrant tachycardia (AVNRT) is caused by a reentrant loop within the atrioventricular node. […] The differential for a regular, narrow complex tachycardia includes sinus tachycardia, atrioventricular nodal reentrant tachycardia (AVNRT), atrioventricular reentrant tachycardia (AVRT), atrial flutter, and atrial tachycardia. […] P waves can aid the diagnosis but are often absent. […] While most cases of AVNRT do not have visible P waves, up to one third of AVNRT cases will show retrograde P waves immediately following the QRS complex, giving the appearance of a pseudo-S wave in the inferior limb leads, or a pseudo-R wave in V1. […] Typical atrioventricular nodal reentrant tachycardia conducts down the slow pathway and up the fast pathway all within the node, and retrograde P waves can occasionally be seen immediately following the QRS complex.

• #3 AV Nodal Reentrant Tachycardia: Causes, Symptoms, and TreatmentHealthline

  https://www.healthline.com/health/arrhythmia/av-nodal-reentrant-tachycardia

  Atrioventricular (AV) nodal reentrant tachycardia (AVNRT) is an irregular heart rhythm that can cause excessively fast heart rates. […] Early diagnosis can help prevent severe symptoms and complications. […] AVNRT is a type of irregular heart rhythm (arrhythmia). […] People with AVNRT may experience a sudden rapid heart rate upward of 140 to 280 beats per minute. […] However, getting an early diagnosis usually leads to a favorable outlook for people with AVNRT. […] If you’ve recently received an AVNRT diagnosis or are concerned you might have this condition, read on to learn more about how it develops, some of the common signs and symptoms, and how a doctor will diagnose and treat it. […] An ECG is important in diagnosing AVNRT. […] However, since the signs and symptoms of AVNRT are sporadic like other types of PSVTs, a doctor may require multiple readings or recommend a home heart monitor.

• #3 AV Nodal Reentrant Tachycardia (AVNRT)

  http://www.washingtonhra.com/arrhythmias/av-nodal-reentrant-tachycardia-avnrt.php

  AV nodal reentrant tachycardia, AVNRT, is the most common cause of supraventricular tachycardia (SVT). […] AVNRT can be diagnosed by your physician via an electrocardiogram or an Ambulatory monitoring device, i.e. Holter or Event monitor, specifically during an arrhythmia episode. […] For patients who require an unequivocal diagnosis, or are candidates for a curative catheter ablation procedure, an intracardiac electrophysiology study is the gold standard test to establish the diagnosis.

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