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.
Shiraishi
Hirokazu
H
Kyoto Prefectural Yosanoumi Hospital.
Ishibashi
Kazuya
K
Urao
Norifumi
N
Hyogo
Masayuki
M
Tsukamoto
Masaki
M
Keira
Natsuya
N
Hirasaki
Satoshi
S
Seo
Yasumasa
Y
Shirayama
Takeshi
T
Nakagawa
Masao
M
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