Journal of the American College of Cardiology
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J. Am. Coll. Cardiol. · May 1994
Randomized Controlled Trial Comparative Study Clinical TrialEffect of beta-blockade on heart rate variability in patients with coronary artery disease.
This study assessed the effects of beta-blockade on heart rate variability in patients with coronary artery disease and determined whether the effects of metoprolol in a controlled-release formulation and atenolol differ with regard to electrocardiographic measures of cardiac autonomic control. ⋯ Beta-blockade by metoprolol and atenolol enhance the heart rate variability in patients with coronary artery disease. This may contribute to the protective effects of beta-blockade in ischemic heart disease.
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J. Am. Coll. Cardiol. · May 1994
Comparative StudyRadiofrequency catheter ablation as a cure for idiopathic tachycardia of both left and right ventricular origin.
The purpose of this study was 1) to investigate the efficacy and safety of radiofrequency energy catheter ablation as curative treatment for idiopathic tachycardia of both left and right ventricular origin, and 2) to compare the usefulness of different methods used to map the site of origin of idiopathic ventricular tachycardia. ⋯ Radiofrequency catheter ablation is an effective treatment for idiopathic ventricular tachycardia. The site of origin of tachycardia is best identified using pace mapping. Significant complications can occur and should be considered in the risk/benefit analysis for each patient.