Open AccessTransient narrowing of a wide QRS tachycardia. What is the mechanism?
Author(s) -
Ribes Francisco,
MartínezBrótons Ángel,
FerreroDeLomaOsorio Ángel,
Bondanza Lourdes,
Albiach Cristina,
MarcosGarcés Víctor,
RuizGranell Ricardo
Publication year - 2020
Publication title -
journal of arrhythmia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.463
H-Index - 21
eISSN - 1883-2148
pISSN - 1880-4276
DOI - 10.1002/joa3.12334
Subject(s) - medicine , cardiology , tachycardia , left bundle branch block , qrs complex , electrophysiology study , palpitations , flecainide , supraventricular tachycardia , sinus rhythm , electrocardiography , anesthesia , catheter ablation , atrial fibrillation , heart failure
Electrocardiogram showing a regular wide QRS tachycardia with left branch block (LBBB) like in morphology at 200 beats per minute (bpm). During electrophysiology study, it suddenly gets narrow and faster. What is the mechanism of the switch from a broad complex to a narrow complex tachycardia?