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Hemodynamic effects of isometric exercise in hypertrophic cardiomyopathy: comparison with normal subjects

Quirino Ciampi1, Sandro Betocchi, Anna Violante

  • 1Departments of Department of Clinical Medicine, Cardiovascular and Immunological Sciences and "Federico II" University School of Medicine, Naples, Italy.

Journal of Nuclear Cardiology : Official Publication of the American Society of Nuclear Cardiology
|April 4, 2003
PubMed

Insights

Isometric exercise impacts hypertrophic cardiomyopathy (HCM) patients differently than healthy individuals. HCM patients, regardless of obstruction, show abnormal responses to handgrip exercise, unlike controls.

Area of Science:

  • Cardiology
  • Exercise Physiology

Background:

  • Hypertrophic cardiomyopathy (HCM) affects heart muscle structure and function.
  • Left ventricular outflow-tract obstruction is a common complication in HCM.
  • Understanding hemodynamic responses to exercise is crucial for managing HCM.

Purpose of the Study:

  • To assess the hemodynamic effects of isometric exercise in patients with obstructive and nonobstructive HCM.
  • To compare these responses with those of healthy control subjects.

Main Methods:

  • Utilized ambulatory radionuclide monitoring (VEST) to measure left ventricular function.
  • Patients performed isometric handgrip exercise at 75% maximal strength.
  • Compared hemodynamic parameters (volumes, cardiac output, vascular resistance) between groups.

Main Results:

  • Heart rate, blood pressure, and cardiac output increased similarly in all groups during exercise.
  • HCM patients showed abnormal lung activity and no change in ventricular volumes or ejection fraction.
  • Systemic vascular resistance increased in HCM patients but not in controls.

Conclusions:

  • Isometric exercise elicits abnormal and similar hemodynamic adaptations in both obstructive and nonobstructive HCM patients.
  • These responses differ significantly from those observed in healthy individuals.
Abstract

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