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[The exercise test in cardiomyopathy]
Insights
Exercise stress tests reveal significant ST depression and angina in both hypertrophic (HCM) and dilatative cardiomyopathy (DCM) patients. Arrhythmias were notably more frequent in DCM, suggesting its consideration in atypical angina cases.
Area of Science:
- Cardiology
- Exercise Physiology
- Diagnostic Imaging
Context:
- Cardiomyopathies, including hypertrophic (HCM) and dilatative (DCM), are significant causes of heart disease.
- Exercise testing is a common diagnostic tool for evaluating cardiac function and ischemia.
- Atypical angina pectoris can present diagnostic challenges, sometimes mimicking coronary artery disease.
Purpose:
- To investigate the diagnostic utility of exercise testing in patients with hypertrophic cardiomyopathy (HCM) and dilatative cardiomyopathy (DCM).
- To compare the occurrence of ischemic changes, angina, and arrhythmias during exercise in HCM and DCM patients.
- To assess the value of exercise testing in differentiating cardiomyopathies from coronary artery disease in patients with atypical angina.
Summary:
- Exercise testing in 30 HCM and 29 DCM patients revealed significant ST depression in 50% of each group and angina in a notable proportion (12/30 HCM, 7/29 DCM).
- Rhythm disturbances were infrequent in HCM but common in DCM, with supraventricular and ventricular ectopic beats observed.
- Nine patients showed an exacerbation of arrhythmia severity (Lown class II-IVb) during exercise, particularly in the DCM cohort.
Impact:
- Exercise testing can provoke cardiac symptoms and arrhythmias, aiding in the diagnosis of cardiomyopathies.
- Findings suggest that cardiomyopathy, particularly DCM, should be considered in patients with atypical angina and abnormal exercise test results.
- This study highlights the importance of evaluating for cardiomyopathies in the differential diagnosis of ischemic heart disease symptoms.
Abstract:
The exercise test in 30 patients with hypertrophic (HCM) and 29 patients with dilatative cardiomoyopathy (DCM) showed a positive test with significant ST depression in half of each group. In 12 out of 30 patients with HCM and 7 out of 29 patients with DCM, exercise testing caused angina. Rhythm disturbances surprisingly did not occur in HCM but where unexpectedly frequent in DCM: in 4 cases exercise testing provoked frequent supraventricular premature beats, in 3 patients paroxysmal atrial fibrillation, and in 11 patients ventricular ectopic beats (Lown class II-IVb). Nine patients exhibited an exacerbation by at least one Lown class as compared with the electrocardiogram at rest. In patients with atypical angina pectoris and a pathological exercise test the possibility of cardiomyopathy - apart from coronary artery disease - should be increasingly considered. With provocation of arrhythmias the possibility of DCM should especially be borne in mind.