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Cardiac arrhythmias associated with treadmill claudication testing
Insights
Treadmill claudication testing in patients with lower limb arterial disease significantly increases electrocardiographic abnormalities. This highlights the critical need for electrocardiographic monitoring during this diagnostic procedure.
Area of Science:
- Cardiology
- Vascular Medicine
- Exercise Physiology
Background:
- Lower limb arterial disease (LLAD) poses significant cardiovascular risks.
- Standard treadmill claudication testing is used to diagnose LLAD.
- The cardiac implications of exercise testing in LLAD patients are not fully understood.
Purpose of the Study:
- To assess the incidence of electrocardiographic (ECG) abnormalities during treadmill claudication testing.
- To determine the safety and necessity of ECG monitoring in patients with suspected LLAD.
Main Methods:
- Eighty-one patients with suspected LLAD underwent a 5-minute treadmill claudication test.
- Electrocardiographic monitoring was performed before, during, and after exercise.
- Abnormalities were quantified and categorized.
Main Results:
- ECG abnormalities increased from 40.6% at rest to 60.5% during exercise.
- Common exercise-induced abnormalities included paroxysmal beats and ST-T wave changes.
- Some abnormalities were severe enough to necessitate test termination.
Conclusions:
- Treadmill claudication testing can provoke significant cardiac events in LLAD patients.
- The risk of cardiac mortality/morbidity in these patients may outweigh limb circulation issues.
- Routine ECG monitoring during treadmill testing is strongly recommended for patient safety.
Abstract:
Eighty-one consecutive patients of an average age of 58 years with suspected lower limb arterial disease underwent standard 5-minute treadmill claudication testing. Prior to, during, and after testing the patients were monitored electrocardiographically. The number of electrocardiographic abnormalities seen in 81 patients undergoing study increased from 33 (40.6%) at rest to 49 (60.5%) with exercise. The commonest abnormalities encountered with exercise were the development and increased incidence of paroxysmal beats and ST-T wave changes which, in some instances, became life-threatening, aborting the test. Since the principal hazard for patients with claudication appears to derive from an increase propensity to cardiac mortality and morbidity, rather than from the consequences of impaired circulation to the limb, electrocardiographic monitoring during treadmill claudication testing, though little practiced, is strongly advised.