EFFETTO DEL DIAZOSSIDO SU PRESSIONE ARTERIOSA, ATTIVITA' RENINICA E ALDOSTERONE PLASMATICO IN PAZIENTI IPERTESI

Translated title of the contribution: Effect of diazoxide on blood pressure, PRA and plasma aldosterone in hypertensive patients

F. Mantero, A. Perini, D. Armanini, M. Gion, G. Opocher, M. Boscaro

Research output: Contribution to journalArticle

Abstract

Intravenous diazoxide (300 mg) was administered to 29 hypertensive patients previously classified in subgroups according to their plasma renin and urinary aldosterone levels. The blood pressure was measured before and periodically after injection and plasma renin activity (PRA) and plasma aldosterone before and after 2 hr. The mean systolic and diastolic blood pressure fell notably from 193/118 to 155/93 mmHg; whereas PRA increased from 7.51 to 13.21 ng/ml/3 hrs and plasma aldosterone did not change significantly (71.3 and 102.8 ng%). Examining the individual subgroups, a significant decrease in blood pressure was observed in 15 patients with low, posture unresponsive PRA, both in subjects with normal urinary aldosterone and those with surgically proven primary aldosteronism. In the former only the mean PRA showed a slight but significant increase, while in the latter the changes for both PRA and aldosterone were not significant. In the subgroups of patients with normal renin and urinary aldosterone the arterial pressure also significantly and promptly decreased. However, in this group the mean PRA substantially increased whereas the plasma aldosterone levels remained constant. The same blood pressure decline was observed in those patients with high PRA and aldosterone, including 1 case of pheochromocytoma. The mean PRA showed a further modest increase while the plasma aldosterone did not change significantly. These results indicate that the antihypertensive action of diazoxide is similar in the different types of hypertension (volume, vasoconstrictor or mixed form according to Laragh's classification), being independent of the basal plasma renin and aldosterone levels. Furthermore, the response of the blood pressure to diazoxide is not related in any way to the induced changes in PRA and plasma aldosterone values.

Translated title of the contributionEffect of diazoxide on blood pressure, PRA and plasma aldosterone in hypertensive patients
Original languageItalian
Pages (from-to)1246-1253
Number of pages8
JournalGiornale Italiano di Cardiologia
Volume6
Issue number7
Publication statusPublished - 1976

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine

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