ISSN:
1432-1238
Keywords:
Aminoguanidine Hemodynamics Nitric oxide Sepsis Sheep
Source:
Springer Online Journal Archives 1860-2000
Topics:
Medicine
Notes:
Abstract. Objective: To define the acute hemodynamic, metabolic, and morphological changes induced by aminoguanidine, a selective iNOS inhibitor, in septic sheep. Design: Prospective, nonrandomized animal study. Setting: Animal research facility in a University Hospital. Interventions: Adult sheep, sedated and mechanically ventilated, were monitored with a pulmonary arterial catheter and an ultrasonic blood flow probe in the mesenteric artery, to measure the systemic (QTOTI) and the mesenteric (QMESI) blood flow indices, and an ileal tonometer. Four groups of sheep were studied: nonseptic, septic, nonseptic treated with aminoguanidine, and septic treated with aminoguanidine (100 mg kg–1 h–1) (n=6 for each group). Sepsis was induced by the intravenous administration of E. coli. Hemodynamic and biochemical parameters were measured during 300 min. Histological changes in the liver and small intestinal mucosa were analyzed at the end of the experiment. Measurements and main results: In nonseptic animals, aminoguanidine slightly increased mean systemic arterial pressure (MAP), decreased QTOTI, and increased vascular resistance index (SVRI) and pulmonary vascular resistance index. QMESI did not change and QMESI/QTOTI increased. Aminoguanidine also induced intestinal intramucosal hypercarbia, hyperlactatemia, acidemia, hypoglycemia, and morphological signs indicative of tissue ischemia in the small intestinal mucosa. In septic sheep, aminoguanidine increased SVRI and MAP only at 4 h after the septic challenge and thereafter, and worsened gas exchange. Conclusions: In this model, exogenous administration of aminoguanidine induces beneficial hemodynamic effects 4 h after the septic challenge. In normal animals, however, aminoguanidine was associated with hypoglycemia, acidosis, hyperlactatemia, and intestinal mucosal ischemia.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s001340000673
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