Open AccessA narrow QRS tachycardia and cannon A waves: What is the mechanism?
Author(s) -
Ali Hussam,
Epicoco Gianluca,
De Ambroggi Guido,
Lupo Pierpaolo,
Foresti Sara,
Cappato Riccardo
Publication year - 2017
Publication title -
annals of noninvasive electrocardiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.494
H-Index - 48
eISSN - 1542-474X
pISSN - 1082-720X
DOI - 10.1111/anec.12423
Subject(s) - medicine , tachycardia , cardiology , qrs complex , supraventricular tachycardia , electrocardiography , atrial tachycardia , mechanism (biology) , anesthesia , catheter ablation , atrial fibrillation , philosophy , epistemology
Regular narrow QRS tachycardia, particularly if well‐tolerated, is usually considered a “benign” arrhythmia of a supraventricular origin. This case concerns an 82‐year‐old male with ischemic heart disease who presented with recurrent episodes of a narrow QRS tachycardia that was initially diagnosed and treated as atrial tachyarrhythmia. However, careful physical examination and ECG analysis established the correct diagnosis, and the patient was managed appropriately. Remarkably, the observation of irregular cannon A waves, and Lewis lead recording, confirmed atrioventricular dissociation during tachycardia and indicated its underlying mechanism.