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Related Experiment Videos

Exercise testing in patients with valvular diseases

D Zdrenghea1, N Giurgea, D Predescu

  • 1Division of Cardiology, Rehabilitation Hospital, Cluj-Napoca, Romana.

Romanian Journal of Internal Medicine = Revue Roumaine De Medecine Interne
|January 1, 1994
PubMed
Summary

Exercise testing in valvular disease patients is often limited by dyspnea, suggesting myocardial aerobic impairment. Early exercise cessation indicates potential underestimation of myocardial ischemia, favoring alternative stress tests.

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Area of Science:

  • Cardiology
  • Exercise Physiology

Background:

  • Valvular diseases (VD) significantly impact cardiac function and exercise capacity.
  • Exercise testing (ET) is crucial for assessing functional aerobic impairment (FAI) in these patients.

Purpose of the Study:

  • To evaluate exercise limitations and myocardial aerobic impairment (MAI) in patients with valvular diseases.
  • To compare FAI with MAI and assess the effectiveness of traditional exercise testing in detecting myocardial ischemia.

Main Methods:

  • Sixty-eight patients with VD underwent symptom-limited maximal exercise testing on a cycloergometer.
  • Myocardial aerobic impairment (MAI) and functional aerobic impairment (FAI) were assessed.
  • Electrocardiographic changes, including ST segment depression, were monitored.

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Main Results:

  • Dyspnea limited exercise in 82% of patients, often before reaching 85% of maximal heart rate (MxHR).
  • Moderate to severe MAI was observed in 42% of patients.
  • A significant difference between FAI and MAI was noted, increasing with NYHA class, indicating physical deterioration beyond the valvular disease itself.
  • ST segment depression occurred in 30% of patients, potentially underestimating myocardial ischemia due to insufficient heart rate rise.

Conclusions:

  • Traditional exercise testing may underestimate myocardial ischemia in VD patients due to early symptom limitation and insufficient heart rate response.
  • Alternative stress testing methods, such as dipyridamole or adenosine, are preferred for investigating myocardial ischemia in this population.
  • Patients with VD exhibit physical deterioration beyond the valvular disease, necessitating comprehensive assessment.