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Systolic dysfunction and blood pressure responses to supine exercise in patients with hypertrophic cardiomyopathy

M Shimizu1, H Ino, K Okeie

  • 1Second Department of Internal Medicine, School of Medicine, Kanazawa University, Japan. shimizu@med.kanazawa-u.ac.jp

Japanese Circulation Journal
|April 24, 2001
PubMed

Insights

Patients with hypertrophic cardiomyopathy (HCM) may experience exercise-induced systolic dysfunction. This dysfunction is linked to abnormal systolic blood pressure responses during exercise in HCM patients.

Area of Science:

  • Cardiology
  • Exercise Physiology
  • Medical Imaging

Background:

  • Hypertrophic cardiomyopathy (HCM) is a genetic heart muscle disease.
  • Non-obstructive HCM affects left ventricular function and blood pressure regulation.
  • Exercise capacity is often limited in HCM patients.

Purpose of the Study:

  • To investigate left ventricular function and blood pressure responses during exercise in non-obstructive HCM.
  • To compare these responses between HCM patients with and without exercise-induced ejection fraction decline and healthy controls.

Main Methods:

  • Utilized radionuclide ventricular function monitoring during supine ergometer exercise.
  • Evaluated 56 patients with non-obstructive HCM and 12 healthy controls.
  • Divided HCM patients into two groups based on ejection fraction (EF) changes during exercise.

Main Results:

  • End-systolic volume changes differed significantly between groups during exercise (p<0.0001).
  • Systolic blood pressure (SBP) changes also varied significantly across groups.
  • Group B (decreased EF) showed smaller SBP increases compared to controls and Group A (no EF decrease).
  • A significant correlation was found between changes in EF and SBP from rest to peak exercise (p<0.005).

Conclusions:

  • Exercise-induced systolic dysfunction in non-obstructive HCM may be associated with abnormal blood pressure responses.
  • Radionuclide assessment can reveal exercise-related functional changes in HCM.
  • Understanding these responses is crucial for managing HCM patients.

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