Cardiomyopathy induced by adenosine-insensitive atrial tachycardia.
Tachycardia-induced cardiomyopathy may be provoked by several arrhythmias; it may reverse following stable restoration of sinus rhythm. We report the case of a 33-year-old man who was diagnosed to have a dilated cardiomyopathy. Over a few months, the cardiomyopathy reversed. Subsequently, atrial tachycardia, associated with a recurrent impairment of left ventricular function, occurred. Adenosine infusion during atrial tachycardia caused transient atrioventricular block without the interruption of arrhythmia, which is consistent with a micro-reentrant mechanism. Electroanatomic mapping during tachycardia showed a focus arising from the left superior pulmonary vein ostium. After successful catheter ablation of the focus, left ventricular function fully recovered.
Division of Cardiology, Morgagni-Pierantoni Hospital, Forli, Italy. paologolia@tiscali.it
Paolo
P
Golia
Luigi
L
Sciarra
Alberto
A
Bandini
Ermenegildo
E
de Ruvo
Ernesto
E
Lioy
Leonardo
L
Calò
Marcello
M
Galvani
D000241:Adenosine; D000328:Adult; D002311:Cardiomyopathy, Dilated / Q000209:etiology* / Q000503:physiopathology / Q000601:surgery; D017115:Catheter Ablation; D004562:Electrocardiography; D022062:Electrophysiologic Techniques, Cardiac; D006801:Humans; D008297:Male; D020127:Recovery of Function; D012815:Signal Processing, Computer-Assisted; D013612:Tachycardia, Ectopic Atrial / Q000150:complications* / Q000503:physiopathology / Q000601:surgery; D016896:Treatment Outcome; D018487:Ventricular Dysfunction, Left / Q000209:etiology* / Q000503:physiopathology / Q000601:surgery
D000241:Adenosine