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Related Experiment Videos

Subclinical cardiac dysfunction in sarcoidosis.

W J Gibbons1, R D Levy, S Nava

  • 1Desmend N. Stoker Laboratory of the Respiratory Division, Royal Victoria Hospital, McGill University, Montreal, Quebec, Canada.

Chest
|July 1, 1991
PubMed
Summary
This summary is machine-generated.

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Patients with sarcoidosis often experience unexplained exertional symptoms due to abnormal heart rate responses. These chronotropic abnormalities, even without overt cardiac disease, can limit exercise performance.

Area of Science:

  • Cardiology
  • Pulmonology
  • Immunology

Background:

  • Myocardial involvement in sarcoidosis is common at autopsy (up to 30%) but clinically infrequent.
  • Unexplained exertional symptoms are a frequent complaint in sarcoidosis patients.
  • The impact of subclinical cardiac dysfunction on exercise capacity in sarcoidosis is not well understood.

Purpose of the Study:

  • To investigate if abnormal cardiac function limits exercise performance in sarcoidosis patients without overt cardiac disease.
  • To identify the prevalence of abnormal heart rate responses during exercise in this population.

Main Methods:

  • Compared exercise responses in 35 sarcoidosis patients to 28 untrained controls.
  • Utilized pulmonary function tests, exercise testing, and ambulatory electrocardiographic (ECG) monitoring.

Related Experiment Videos

  • Assessed left ventricular ejection fraction (LVEF) to evaluate systolic function.

    • Main Results:

    • 46% of sarcoidosis patients exhibited abnormally increased heart rates (HRs) at rest or during exercise.
    • Abnormal HRs were confirmed by ambulatory ECG monitoring.
    • Chronotropic abnormalities were present in patients with both reduced and normal LVEFs, with many showing resting tachycardia.

    Conclusions:

    • Abnormal heart rate responses are common in sarcoidosis patients, even without evident cardiac involvement.
    • Exertional symptoms in these patients are frequently linked to chronotropic abnormalities.
    • Potential mechanisms include ventricular systolic dysfunction or sinus node dysfunction due to granulomatous infiltration.