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Disparities in blood pressure control under various antihypertensive regimens
R E Schmieder1, M Bähr, W Langewitz
1Department of Medicine, University of Bonn, Federal Republic of Germany.
Insights
Different hypertension medications show varied effectiveness. While all lowered blood pressure, oxprenolol and nitrendipine better controlled ambulatory blood pressure and stress responses compared to clonidine and enalapril.
Area of Science:
- Pharmacology
- Cardiovascular Medicine
- Hypertension Management
Background:
- Hypertension is a global health concern requiring effective pharmacological interventions.
- Several drug classes, including beta-blockers, calcium channel blockers, ACE inhibitors, and centrally acting agents, are used to manage high blood pressure.
Purpose of the Study:
- To compare the antihypertensive efficacy of four distinct drug classes: oxprenolol, nitrendipine, enalapril, and clonidine.
- To evaluate both resting and dynamic (exercise-induced) blood pressure control in hypertensive patients.
Main Methods:
- A comparative study involving hypertensive patients undergoing treatment with oxprenolol, nitrendipine, enalapril, or low-dose clonidine.
- Ambulatory blood pressure monitoring (ABPM) and exercise stress testing were conducted after six months of therapy.
- Resting blood pressure and casual blood pressure measurements were also analyzed.
Main Results:
- All four treatments effectively reduced blood pressure to normotensive ranges.
- Oxprenolol and nitrendipine demonstrated superior control of average ambulatory blood pressure compared to clonidine and enalapril.
- Clonidine and enalapril groups showed lower casual systolic pressures, while oxprenolol exhibited the lowest stress blood pressures during exercise.
Conclusions:
- Despite achieving normotensive ranges, antihypertensive efficacy varies significantly among different drug classes.
- Oxprenolol and nitrendipine appear more effective in controlling 24-hour blood pressure and mitigating exercise-induced hypertensive responses.
- The choice of antihypertensive medication should consider not only resting blood pressure but also ambulatory and stress blood pressure profiles.
Abstract:
Ambulatory blood pressure recordings and stress blood pressures during exercise were compared among hypertensive patients effectively treated with oxprenolol, nitrendipine, enalapril or low-dose clonidine. After 6 months of therapy, the means of blood pressure at rest and casual diastolic pressure were nearly identical among the four therapeutic groups. Although all pressures fell to within the normotensive range, casual systolic pressures were lower in patients treated with sympatholytic agents than in those taking enalapril. In contrast, average ambulatory blood pressure was less controlled in patients given clonidine or enalapril than in those given oxprenolol or nitrendipine. During physical stress patients taking clonidine showed the highest stress blood pressures and those taking oxprenolol the lowest pressures. The study demonstrated that although blood pressure was reduced to within the normotensive range in all four therapeutic groups, analysis of values of ambulatory blood pressure and stress blood pressure during physical activity showed a disparate pattern of antihypertensive efficacy.