Effects of dopamine on total oxygen consumption and oxygen delivery in healthy men.


Autoria(s): Ruttimann Y.; Chioléro R.; Jéquier E.; Breitenstein E.; Schutz Y.
Data(s)

1989

Resumo

The effect of acute intravenous dopamine (DA) administration at three sequential (but randomized) infusion rates was studied in eight young male volunteers. DA was infused at 2.5, 5, and 10 micrograms.kg-1.min-1. O2 consumption (VO2) and CO2 production (VCO2) were measured continuously by means of a computerized indirect calorimeter (blood system). In response to the 5- and 10-micrograms.kg-1.min-1 DA infusion rates, a significant increase (P less than 0.01) in VO2 corresponding to a 6% (range, 3-10) and 15% (range, 12-23) increase, respectively, of preinfusion values was observed. In contrast, at the low dose (2.5 micrograms.kg-1.min-1), DA induced no significant change in VO2. Cardiac output (Qc) increased significantly after the three DA administration rates [19% (range, 0-42), 34% (range, 17-71), and 25% (range, -3 to +47)] for the doses 2.5, 5, and 10 micrograms.-kg-1.min-1, respectively. The increase in O2 delivery (QO2) outweighed VO2 at all administration rates despite the relative drop in QO2 at the maximal DA administration rate. These results indicate that in humans DA improves net O2 supply to tissues proportionally more than it increases VO2 at all doses used in the present study.

Identificador

http://serval.unil.ch/?id=serval:BIB_42D9C422D3CA

isbn:0193-1849 (Print)

pmid:2508483

isiid:A1989CC64500043

Idioma(s)

en

Fonte

American Journal of Physiology. Endocrinology and Metabolism, vol. 257, no. 4 Pt 1, pp. E541-E546

Palavras-Chave #Adult; Blood Pressure/drug effects; Carbon Dioxide/blood; Dopamine/blood; Dopamine/pharmacology; Epinephrine/blood; Heart Rate/drug effects; Hemodynamics/drug effects; Humans; Male; Norepinephrine/blood; Oxygen/blood; Oxygen Consumption/drug effects; Vascular Resistance/drug effects
Tipo

info:eu-repo/semantics/article

article