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Sinus Tachycardia with Atrioventricular Block:
Author(s) -
SRA JASBIR,
SINGH BALBIR,
BLANCK ZALMEN,
DHALA ANWER,
AKHTAR MASOOD
Publication year - 1998
Publication title -
journal of cardiovascular electrophysiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.193
H-Index - 138
eISSN - 1540-8167
pISSN - 1045-3873
DOI - 10.1111/j.1540-8167.1998.tb00901.x
Subject(s) - medicine , syncope (phonology) , disopyramide , asystole , anesthesia , cardiology , sinus bradycardia , vasovagal syncope , tachycardia , sinus tachycardia , sinus (botany) , sick sinus syndrome , sinus rhythm , atrioventricular block , bradycardia , heart rate , atrial fibrillation , blood pressure , botany , biology , genus
Sinus Tachycardia with AV Block During VVS. Introduction : Neurocardiogenic (vasovagal) syncope is characterized by hypotension and bradycardia. The presence of sinus tachycardia along with AV block during syncope in patients with neurocardiogenic syncope has not been described previously. Methods and Results : Two female patients (18 and 16 years old) with recurrent syncope and documented sinus tachycardia at the time of syncope are described. Patient 1 had recurrent episodes of syncope. During one of these episodes, which occurred while she was being monitored, sinus tachycardia along with high‐grade AV block was seen at the time of syncope and hypotension. Patient 2 had a history of recurrent syncope and seizure. During one of these episodes, she was documented to have ventricular asystole lasting for about 39 seconds. The sinus rate was 480 msec at the beginning, before slowing down to 960 msec prior to restoration of sinus rhythm with 1:1 AV conduction. The same scenario was repeated during head‐up tilt testing. Both patients were treated successfully with oral disopyramide and, during a follow‐up of 28 months and 9 months, have remained symptom‐free. Conclusion : Sinus acceleration along with high‐grade AV block during syncope and hypotension can occur in some patients with neurocardiogenic syncope. The exact mechanism of this phenomenon is unclear.