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The treadmill test--where to stop and what does it mean?
G Ramamurthy1, J E Kerr, D Harsha
1Department of Medicine, St. Vincent Hospital, Indianapolis, IN, USA.
Chest
|April 20, 1999
Summary
Achieving an adequate workload during an exercise electrocardiogram (ECG) test is crucial for accurate cardiac risk assessment. A minimum of 7 to 10 metabolic equivalents (METS) indicates sufficient stress for a favorable prognosis in negative stress tests.
Area of Science:
- Cardiology
- Exercise Physiology
Background:
- The prognostic value of exercise electrocardiogram (ECG) testing relies on achieving sufficient cardiac stress.
- Current guidelines suggest various workload indices, including heart rate, rate-pressure product, and metabolic equivalents (METS).
Purpose of the Study:
- To evaluate the prognostic utility of different workload indices in exercise ECG testing.
- To determine the minimum workload required for a negative stress test to indicate a favorable patient outcome.
Main Methods:
- Review of existing literature on exercise ECG testing and prognostic variables.
- Analysis of evidence supporting METS, rate-pressure product, and heart rate as indicators of adequate workload.
- Examination of the relationship between workload intensity and patient prognosis.
Main Results:
- METS are a strong independent prognostic variable, while support for rate-pressure product and heart rate is less robust.
- High heart rate at low workload may indicate an adverse prognosis.
- 7 to 10 METS is suggested as a reasonable minimum workload for favorable outcomes in negative stress tests.
Conclusions:
- Adequate workload is essential for the prognostic accuracy of exercise ECG tests.
- METS appear to be a more reliable indicator of adequate stress than heart rate or rate-pressure product.
- Further research is needed to precisely define the optimal METS threshold for adequate workload, but 7-10 METS is a practical interim guideline.