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Effects of atenolol, verapamil, and xamoterol on heart rate and exercise tolerance in digitalised patients with chronic atrial fibrillation.

Abstract：

:The aim of the study was to compare the effects of atenolol (50 mg b.i.d.), verapamil (80 mg b.i.d.), xamoterol (200 mg b.i.d.), and matching placebo on heart rate (HR) and exercise tolerance in digitalised patients with chronic atrial fibrillation. Each treatment was taken for 4 weeks, and digoxin was continued throughout the study. During treatment with placebo (digoxin alone), the mean postexercise heart rate was 164 beats/min, and four subjects had rates of greater than or equal to 170 beats/min. Atenolol, verapamil, and xamoterol achieved significantly better control of exercise-induced tachycardia, mean postexercise heart rates being reduced to 120, 131, and 130 beats/min, respectively (p less than 0.01 for each). However, minimum HRs less than or equal to 45 beats/min occurred during treatment with placebo, atenolol, and verapamil, whereas treatment with xamoterol was associated with a minimum heart rate of 56 beats/min. Treatment with atenolol was associated with a marked reduction in maximum treadmill walking distance (mean 356 m) as compared both with placebo (mean 421 m, p less than 0.01) and verapamil (mean 439 m, p less than 0.01). Xamoterol reduced maximum walking distances as compared with verapamil (402 vs. 439 m; p less than 0.05) but not placebo (402 vs. 421 m; NSS). Thus, atenolol, verapamil, and xamoterol achieved better control of exercise-induced tachycardia than digoxin, but atenolol clearly impaired exercise tolerance whereas verapamil did not. Xamoterol achieved more even control of ventricular response rates and prevented the resting bradycardias that occurred with the other treatments. However, walking distances were significantly lower than those noted during treatment with verapamil.

journal_name

J Cardiovasc Pharmacol

journal_title

Journal of cardiovascular pharmacology

authors

Lewis RV,McMurray J,McDevitt DG

doi

10.1097/00005344-198901000-00002

subject

Has Abstract

pub_date

1989-01-01 00:00:00

pages

1-6

issue

eissn

0160-2446

issn

1533-4023

journal_volume

pub_type

临床试验,杂志文章,随机对照试验

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Effects of atenolol, verapamil, and xamoterol on heart rate and exercise tolerance in digitalised patients with chronic atrial fibrillation.