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Blood pressure variability in patients on beta-blockers
Australian and New Zealand Journal of Medicine
|August 1, 1976
Summary
Beta-adrenergic blocking agents like tolamolol reduce blood pressure and heart rate. However, this study found that tolamolol does not affect blood pressure variability in patients.
Area of Science:
- Cardiovascular Physiology
- Pharmacology
Background:
- Direct arterial blood pressure monitoring provides insights into hemodynamic variability.
- Understanding blood pressure variability is crucial for assessing cardiovascular health.
Purpose of the Study:
- To evaluate the effect of tolamolol, a beta-adrenergic blocking agent, on blood pressure and its variability.
- To assess changes in mean blood pressure and heart rate following treatment.
Main Methods:
- 24-hour direct arterial blood pressure monitoring in unrestricted patients.
- Measurement of average pressure and standard deviation as an index of variability.
- Repeated measurements in eight subjects after three months of tolamolol treatment (300 mg/day).
Main Results:
- Tolamolol significantly reduced mean blood pressure from 107 to 92 mmHg (P < 0.05).
- Heart rate decreased from 82 to 70 beats per minute (P < 0.01) with tolamolol treatment.
- Blood pressure variability, measured by standard deviation, remained unaffected by tolamolol.
Conclusions:
- Tolamolol effectively lowers both mean blood pressure and heart rate.
- The therapeutic effect of tolamolol does not extend to altering blood pressure variability.