Effects of halothane anesthesia on vasoconstrictor response to N(G)- nitro-L-arginine methyl ester, an inhibitor of nitric oxide synthesis, in sheep

J. Meyer, C. W. Lentz, David Herndon, S. Nelson, L. D. Traber, D. L. Traber

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

This study tests the hypothesis that halothane-induced inhibition of the endothelium-derived relaxing factor/nitric oxide (EDRF/NO) pathway significantly contributes to cardiovascular performance and thus reduces the vasoconstrictor response to NO synthesis inhibitors in vivo. We determined the effects of the administration of the NO synthesis inhibitor N(G)-nitro- L-arginine methyl ester (L-NAME) in chronically instrumented, halothane- anesthetized sheep and in awake control animals. Six sheep underwent halothane anesthesia (1.5 vol%) with mechanical ventilation. Five sheep were studied in the awake state with spontaneous breathing. Both groups received a bolus of L-NAME (25 mg/kg), followed 4 h later by L-arginine (300 mg/kg) to reverse the effects of L-NAME. L-NAME administration caused a significant increase in pulmonary and systemic vascular resistance (P < 0.05) in both groups. However, L-NAME produced a sharp increase in mean arterial and pulmonary artery pressures only in the control group, whereas the pressor response in the halothane group was attenuated. Cardiac output, which was significantly lower after L-NAME administration in both groups, increased after L-arginine. The results suggest that halothane does not significantly alter the EDRF/NO-mediated effects on the vasculature but potentiates the cardiac depressant effect of L-NAME.

Original languageEnglish (US)
Pages (from-to)1215-1221
Number of pages7
JournalAnesthesia and Analgesia
Volume77
Issue number6
StatePublished - 1993

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NG-Nitroarginine Methyl Ester
Vasoconstrictor Agents
Halothane
Sheep
Nitric Oxide
Anesthesia
Endothelium-Dependent Relaxing Factors
Vascular Resistance
Arginine
Anti-Arrhythmia Agents
Artificial Respiration
Cardiac Output
Pulmonary Artery
Respiration
Pressure
Control Groups

ASJC Scopus subject areas

  • Anesthesiology and Pain Medicine

Cite this

Effects of halothane anesthesia on vasoconstrictor response to N(G)- nitro-L-arginine methyl ester, an inhibitor of nitric oxide synthesis, in sheep. / Meyer, J.; Lentz, C. W.; Herndon, David; Nelson, S.; Traber, L. D.; Traber, D. L.

In: Anesthesia and Analgesia, Vol. 77, No. 6, 1993, p. 1215-1221.

Research output: Contribution to journalArticle

Meyer, J. ; Lentz, C. W. ; Herndon, David ; Nelson, S. ; Traber, L. D. ; Traber, D. L. / Effects of halothane anesthesia on vasoconstrictor response to N(G)- nitro-L-arginine methyl ester, an inhibitor of nitric oxide synthesis, in sheep. In: Anesthesia and Analgesia. 1993 ; Vol. 77, No. 6. pp. 1215-1221.
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