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Clinical assessment of beta blockade
M W Weston1, S P Glasser, D J Stoner
1Division of Cardiology, University of South Florida College of Medicine, Tampa.
Clinical Cardiology
|May 1, 1988
Summary
The leg squat test can help assess beta-adrenergic blockade (AdBB) adequacy. A post-squat heart rate above 110 beats/min suggests AdBB is likely absent, offering a cost-effective clinical tool.
Area of Science:
- Clinical Physiology
- Pharmacology
Background:
- Assessing beta-adrenergic blockade (AdBB) is crucial for managing cardiovascular conditions.
- Clinical measurements are needed to reliably determine the effectiveness of AdBB.
Purpose of the Study:
- To evaluate the leg squat test as a clinical measurement for assessing AdBB adequacy.
- To determine the diagnostic accuracy of various post-leg squat heart rate thresholds for AdBB.
Main Methods:
- Seventy subjects were divided into two groups: those receiving beta-adrenergic blocking drugs and a control group.
- Leg squat tests were performed, and heart rate responses were analyzed.
- Sensitivity, specificity, and predictive values were calculated for different heart rate cutoffs.
Main Results:
- Resting heart rate and percent increase over baseline did not reliably predict AdBB.
- A post-leg squat heart rate ≤100 beats/min showed moderate diagnostic values (Se=.82, Sp=.67, Pv+=.70, Pv-=.80).
- A post-leg squat heart rate >110 beats/min strongly indicated the absence of AdBB in the study population.
Conclusions:
- The leg squat test, particularly a post-squat heart rate >110 beats/min, can be a useful indicator for the absence of AdBB.
- While a threshold of ≤100 beats/min has limitations, the leg squat test demonstrates potential as a cost-effective clinical tool for AdBB assessment.
- Further validation may be needed for specific clinical scenarios, but the test shows promise for routine use.