Dec 24, 2003

Exercise at ventilatory threshold aggravates left ventricular remodeling in patients with extensive anterior acute myocardial infarction

American Heart Journal
Norifumi KuboMuneyasu Saito

Abstract

The effects of physical training on ventricular remodeling after extensive anterior acute myocardial infarction (AMI) have not yet been defined. This randomized controlled study examines whether exercise aggravates left ventricular (LV) remodeling in patients with extensive anterior AMI. Forty-eight consecutive patients with a first extensive anterior AMI and an LV ejection fraction (EF) of <45% assessed with left ventriculography (LVG) within 3 days of onset were randomly allocated to a training group (n = 24) or a control group (n = 24). Exercise intensity was determined by the heart rate of each patient at ventilatory threshold (VT). Three weeks after onset, a second LVG was performed, followed by a supervised exercise program at VT for 12 weeks. The LVG was reassessed after the exercise program. We then calculated the global LV volume (end-diastolic volume index [EDVI], end-systolic volume index [ESVI]) and systolic expansion volume index (SEVI), a new parameter for measuring the infarction site expansion at the end-systolic phase. Both EDVI and ESVI significantly decreased in the control group from 1 to 4 months after onset (91.2 +/- 26.1 to 83.3 +/- 24.0 mL/m2, P <.05; 52.4 +/- 22.5 to 45.7 +/- 18.8 mL/m2, P <.01, respect...Continue Reading

Mentioned in this Paper

Left Ventricle Remodeling
Ventricular Dysfunction, Left
Aphasia, Broca
Myocardial Infarction
Cardiopulmonary Exercise Test
Ventricular Remodeling
Heart Ventricle
Anterior Myocardial Infarction
Respiration
Respiratory Insufficiency

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