[Clinical features of idiopathic ventricular tachycardia of various types and their radiofrequency ablation therapy].

Objective: To analyze the clinical features idiopathic ventricular tachycardia (IVT) and evaluate the effect of radiofrequency ablation therapy for their management.

Methods: An retrospective analysis was conducted in 165 IVT patients who received radiofrequency ablation therapy. IVT was classified into 3 types according to the site of origin, namely the right ventricular outflow tract (RVOT-IVT, 86 cases), left ventricular septum (LV-IVT, 75 cases), and left Valsalva sinus (4 cases).

[Protective effects of losartan against myocardial ischemic reperfusion in intact canine].

Objective: To evaluate the protective effect of losartan, an angiotensin II type 1 (AT1) receptor antagonist, against myocardial ischemic reperfusion in intact canine.

Methods: Sixteen dogs were divided into model group(n=8) with left anterior descending coronary artery occlusion for 30 min followed by reperfusion for 30 min and losartan group (n=8) with 5 mg/(kg x d) intragastric losartan administration for 2 weeks before the ischemic-reperfusion model establishment. Monophasic action potential recording technique was employed to observe the incidence of early after depolarization (EAD) and reperfusion arrhythmias.