Effect of oral sotalol on systemic hemodynamics and programmed electrical stimulation in patients with ventricular...

We explored the central hemodynamic responses to oral sotalol during dose titration in patients with ventricular arrhythmias who underwent programmed ventricular stimulation. Twelve patients were included in the study, 9 with a history of sustained ventricular tachyarrhythmias (6 postmyocardial infarction and 3 with cardiomyopathy) and 3 with a history of nonsustained ventricular tachycardia postmyocardial infarction. Left ventricular ejection fractions were < 45% in 10 patients, and < 35% in 5; the mean ejection fraction was 37% (range 20-51%). Sotalol prevented the induction of ventricular tachycardia in each of 3 patients with nonsustained ventricular tachycardia and in 6 of 9 with sustained ventricular tachycardia at baseline study. At peak action (2 hours) after sotalol loading (mean dose, 167 mg orally twice daily), the hemodynamic effects included bradycardia, decreased cardiac index, increased left ventricular filling pressure and systemic vascular resistance, and no change in stroke volume or stroke work index. One patient was not continued on sotalol, owing to an excessive increase in the pulmonary capillary wedge pressure, despite the lack of symptomatic heart failure. Congestive heart failure in association with marked bradycardia developed in another patient, who had suppression of inducible ventricular tachycardia after sotalol loading; this patient was managed with a reduction in the dose of sotalol and a regimen of digoxin and furosemide, and has been well compensated and without a recurrence of sustained ventricular tachycardia for more than 4 years. Ventricular tachycardia has been controlled with sotalol, without hemodynamic deterioration, in 6 of these patients.(ABSTRACT TRUNCATED AT 250 WORDS)