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Effect of alpha‐methyldopa on cardiac output in hypertension
Author(s) -
Safar M. E.,
London G. M.,
Levenson J. A.,
Kheder M. A.,
Aboras N. E.,
Simon A. Ch.
Publication year - 1979
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 - 10.1002/cpt1979253266
Subject(s) - methyldopa , alpha (finance) , medicine , cardiac output , cardiology , blood pressure , surgery , construct validity , patient satisfaction
Hemodynamic and blood volume changes, systolic time intervals, and baroreflex mechanisms were studied in 20 patients with hypertension after methyldopa (12 ± 0.9 mg/kg/day). The drug was administered orally during 7 days' hospitalization on a normal sodium diet (110 mEq/day). There was a fall in blood pressure and in total peripheral resistance, without significant change in cardiac index, heart rate, and stroke index. There were increases in plasma and blood volume (p < 0.05) but no change in cardiopulmonary blood volume or systolic time intervals. The unchanged heart rate was associated with an increased sensitivity (p <0.05) of the baroreflex mechanisms. The study supports the view that the unchanged cardiac output after methyldopa is related to important changes in control of cardiac output, including redistribution of blood volume and modifications in baroreflex mechanisms.