Two cases of polymorphic ventricular tachycardia induced by the administration of verapamil against paroxysmal supraventricular tachycardia.
Verapamil is widely used for the termination of paroxysmal supraventricular tachycardia (PSVT) with little proarrhythmic effect. We describe two cases of PSVT that changed to non-sustained polymorphic ventricular tachycardia after administration of verapamil. Electrophysiological study revealed atrioventricular nodal reentrant tachycardia in the first case, and atrioventricular reentrant tachycardia due to a concealed left lateral accessory pathway in the second case. Catecholamine-induced automaticity was one of the possible mechanisms of VT in the first case, but the mechanism is unknown in the second case.
Kyoto Prefectural Yosanoumi Hospital.
Hirokazu
H
Shiraishi
Kazuya
K
Ishibashi
Norifumi
N
Urao
Masayuki
M
Hyogo
Masaki
M
Tsukamoto
Natsuya
N
Keira
Satoshi
S
Hirasaki
Yasumasa
Y
Seo
Takeshi
T
Shirayama
Masao
M
Nakagawa
D000889:Anti-Arrhythmia Agents / Q000009:adverse effects*; D017115:Catheter Ablation; D004562:Electrocardiography; D022062:Electrophysiologic Techniques, Cardiac; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D013617:Tachycardia, Supraventricular / Q000188:drug therapy*; D017180:Tachycardia, Ventricular / Q000139:chemically induced*; D016896:Treatment Outcome; D014700:Verapamil / Q000009:adverse effects*
D000889:Anti-Arrhythmia Agents; D014700:Verapamil