Beta adrenergic blockade does not improve effort tolerance in patients with mitral stenosis in sinus rhythm.

Abstract:

OBJECTIVES:This study was designed to assess the effects of beta-blockade on cardiopulmonary exercise performance in symptomatic patients with tight mitral stenosis in sinus rhythm. BACKGROUND:The role of beta-blockers in these patients has been controversial and assessment of effort tolerance using treadmill exercise time has produced conflicting results. METHODS:Nineteen patients with isolated symptomatic (New York Heart Association class II or III) mitral stenosis received a beta-blocker (acebutalol or atenolol) or matching placebo for one week each in a randomized double-blind crossover fashion. Exercise on a treadmill with real time gas exchange analysis was performed six times over 4 weeks in each patient. The test was further repeated once within a week of percutaneous mitral valvotomy. RESULTS:Heart rate at rest and during peak exercise was significantly lower with beta-blockade compared to control state or placebo treatment. Mean peak oxygen consumption did not differ significantly between treatment groups. When patients were arbitrarily classified into those with (group I, heart rate < or = 130.min-1) and those without (group II, heart rate > or = 131.min-1) adequate beta-blockade, there was a significant difference in peak VO2. The peak VO2 for group I: 14.0 +/- 3.2 vs 17.5 +/- 4.0 ml.min-1.kg-1; peak VO2 for group II: 17.2 +/- 2.4 vs 18.0 +/- 2.4 ml.min-1.kg-1 (beta-blockade vs control state respectively). Treadmill exercise time did not differ between treatment groups. The slope of minute ventilation (MV) and carbon dioxide (CO2) excretion, and instantaneous carbon dioxide ventilatory equivalent (MV/VCO2) was unchanged with beta-blocker therapy indicating no improvement in ventilatory performance. CONCLUSIONS:Beta-blocker therapy in tight mitral stenosis appears to have no beneficial effect on aerobic capacity, nor does it improve ventilatory performance. Adequate beta-blockade may adversely effect peak oxygen consumption.

journal_name

Eur Heart J

journal_title

European heart journal

authors

Patel JJ,Dyer RB,Mitha AS

doi

10.1093/oxfordjournals.eurheartj.a061084

subject

Has Abstract

pub_date

1995-09-01 00:00:00

pages

1264-8

issue

9

eissn

0195-668X

issn

1522-9645

journal_volume

16

pub_type

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