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Treatment of hypertension successively with a diuretic, clonidine or a beta-blocking agent and hydralazine
Insights
This study compared hypertension treatments in 49 patients. Clonidine and practolol showed similar effectiveness, but clonidine had mild side effects, and practolol was later withdrawn due to toxicity.
Area of Science:
- Cardiology
- Pharmacology
Background:
- Hypertension management requires effective and safe therapeutic options.
- Understanding the comparative efficacy of different antihypertensive agents is crucial.
Purpose of the Study:
- To evaluate the efficacy of cyclothiazide, clonidine, practolol, and hydralazine in treating untreated hypertensive patients.
- To compare the antihypertensive effects of clonidine and practolol.
Main Methods:
- A placebo-controlled study involving 49 untreated hypertensive patients (aged 45).
- Sequential treatment with cyclothiazide, clonidine, or practolol, with dose adjustments.
- Addition of hydralazine in non-responsive cases.
Main Results:
- Cyclothiazide showed a good response in 6 patients.
- Clonidine and practolol achieved good responses in 31 patients, with comparable antihypertensive effects.
- Hydralazine was required in 12 cases for satisfactory blood pressure control.
- Mild side effects were noted with clonidine but did not lead to discontinuation.
Conclusions:
- Clonidine and practolol are effective antihypertensive agents, with similar efficacy at the doses studied.
- Practolol's long-term toxicity led to its withdrawal.
- Further research on clonidine and beta-blocker combinations, and clonidine with vasodilators, is warranted for hypertension treatment.
Abstract:
The present study was carried out in an homogenous group of 49 untreated hypertensive patients, all aged 45 years. Diastolic blood pressure was equal to or greater than 110 mmHg in successive measurements; eleven patients were classified as WHO group II, and the others as WHO group I. An initial placebo period of 3 weeks was followed by cyclothiazide medication with a good response in 6 patients. The remaining patients were given either clonidine or practolol, and by adjustment of the dose a good response was obtained in 31 patients. In these cases the treatment was exchanged after 6 weeks. The antihypertensive effect of relatively small doses of clonidine was equal to that of practolol. Since completion of the study practolol has been withdrawn because of the emergence of long term toxic effects. In 12 cases, hydralazine had to be added to obtain a satisfactory response. Mild side-effects were common, especially at the beginning of clonidine treatment, but they did not necessitate discontinuation of treatment. Further comparative studies of clonidine and beta-blockers should be carried out and more experience with the combination of clonidine and vasodilators in the treatment of hypertension is necessary.