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Cardiac arrhythmias and submaximal exercise test
Insights
Cardiac arrhythmias, particularly ventricular premature beats, occurred in 6% of subjects during exercise tests. These arrhythmias often signal underlying organic heart disease, especially ischemic conditions, indicating reduced cardiac efficiency.
Area of Science:
- Cardiology
- Exercise Physiology
Background:
- Cardiac arrhythmias are common and can be exacerbated by physical activity.
- Identifying the underlying causes of arrhythmias is crucial for patient management.
Purpose of the Study:
- To investigate the incidence and characteristics of cardiac arrhythmias during submaximal exercise.
- To explore the relationship between exercise-induced arrhythmias and cardiac efficiency, particularly in the context of organic heart disease.
Main Methods:
- A submaximal exercise test was administered to 1000 subjects.
- Cardiac arrhythmias were monitored and analyzed.
- Cardiac efficiency was assessed using indices like the tension-time index, maximal oxygen consumption, PEP, and PEP/LEVT ratio.
Main Results:
- A 6% incidence of cardiac arrhythmias was observed.
- Ventricular premature beats were the most frequent arrhythmia, often linked to organic, likely ischemic, heart disease.
- Left bundle branch block and ventricular tachycardia were rare but indicative of organic heart disease.
- Patients with exercise-induced arrhythmias showed an increased tension-time index to maximal oxygen consumption ratio, suggesting inefficient cardiac work.
- Increased PEP and PEP/LEVT ratio during recovery in subjects with ventricular premature beats indicated lowered cardiac efficiency.
Conclusions:
- Cardiac arrhythmias frequently coexist with organic heart disease, particularly ischemic heart disease.
- Exercise-induced arrhythmias may serve as indicators of reduced cardiac efficiency and underlying cardiac pathology.
Abstract:
Cardiac arrhythmias, investigated in 1000 persons subjects to a submaximal exercise test, showed an incidence of 6%. The most frequent were the ventricular premature beats, related in more than half of the cases to an organic, probably ischemic, heart disease. Left bundle branch block and ventricular tachycardia were rare and indicated an organic heart disease. Several other rare arrhythmias are discussed. In patients with exercise-induced cardiac arrhythmias, an increased ratio of the tension-time index to maximal oxygen consumption indicates an uneconomical and less efficient cardiac work. The increase of the PEP and of the PEP/LEVT ratio during recovery, in the subjects exhibiting exercise-induced ventricular premature beats, also suggests a lowered cardiac efficiency. These findings support the view that cardiac arrhythmias frequently coexist with an organic, especially ischemic, heart disease.