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Long‐term hemodynamic and metabolic effects of trimazosin in essential hypertension
Author(s) -
Chrysant Steven G,
Miller Robert F,
Brown Janet L,
Danisa Kola
Publication year - 1981
Publication title -
clinical pharmacology and therapeutics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.941
H-Index - 188
eISSN - 1532-6535
pISSN - 0009-9236
DOI - 10.1038/clpt.1981.210
Subject(s) - supine position , essential hypertension , dose , plasma renin activity , medicine , hemodynamics , blood pressure , aldosterone , placebo , heart rate , anesthesia , cardiology , pharmacology , renin–angiotensin system , alternative medicine , pathology
The long‐term effects of trimazosin (TMZ) were studied in 26 male patients with mild essential hypertension. After a 2 wk single‐blind placebo (P) period, 13 patients were randomly selected to receive TMZ and 13 P; they were followed for an additional 8 wk. TMZ was given in incremental doses of 25 to 50. 100 to 200, and finally 300 mg three times a day. The patients were seen at the clinic every 2 wk and their arterial pressures (AP) and heart rates (HRs) were measured in the supine (5 min) and upright (2 min) position. Blood chemistries, blood count, plasma volume (PV), plasma renin activity (PRA), plasma aldosterone (PA), and cardiac output (CO) were determined by ultrasound at the end of P and TMZ periods. TMZ decreased the AP and total peripheral resistance (TPR) at the higher dosages, but had no effect on PV, PRA, PA, CO, HR, or blood chemistry determinations. No effects were observed on any of the above parameters after P. We conclude that (1) TMZ is an effective and safe antihypertensive, (2) it lowers AP through reduction of TPR, and (3) its effect is dose related. Clinical Pharmacology and Therapeutics (1981) 30, 600–604; doi: 10.1038/clpt.1981.210