Differential effects of general anesthesia on cGMP-mediated pulmonary vasodilation

P. A. Murray, D. M. Fehr, B. B. Chen, P. Rock, J. W. Esther, P. M. Desai, Daniel Nyhan

Research output: Contribution to journalArticle

Abstract

We investigated the effects of an intravenous (pentobarbital sodium) and an inhalational (halothane) general anesthetic on guanosine 3',5'-cyclic monophosphate- (cGMP) mediated pulmonary vasodilation compared with responses measured in the conscious state. Multipoint pulmonary vascular pressure-flow plots were generated in the same nine dogs in the fully conscious state, during pentobarbital sodium anesthesia (30 mg/kg iv), and during halothane anesthesia (~1.2% end tidal). Continuous intravenous infusions of bradykinin (2 μg · kg-1 · min-1) and sodium nitroprusside (5 μg · kg-1 · min-1) were utilized to stimulate endothelium-dependent and -independent cGMP-mediated pulmonary vasodilation, respectively. In the conscious state, both bradykinin and nitroprusside decreased (P <0.01) the pulmonary vascular pressure gradient (pulmonary arterial pressure - pulmonary arterial wedge pressure) over the entire range of flows studied; i.e., bradykinin and nitroprusside caused active flow-independent pulmonary vasodilation. Pulmonary vasodilator responses to bradykinin (P <0.01) and nitroprusside (P <0.05) were also observed during pentobarbital anesthesia. In contrast, during halothane anesthesia, the pulmonary vasodilator responses to both bradykinin and nitroprusside were abolished. These results indicate that, compared with the conscious state, cGMP-mediated pulmonary vasodilation is preserved during pentobarbital anesthesia but is abolished during halothane anesthesia.

Original languageEnglish (US)
Pages (from-to)721-727
Number of pages7
JournalJournal of Applied Physiology
Volume73
Issue number2
StatePublished - 1992

Fingerprint

Vasodilation
General Anesthesia
Lung
Nitroprusside
Bradykinin
Anesthesia
Halothane
Pentobarbital
Vasodilator Agents
Blood Vessels
Arterial Pressure
Pressure
General Anesthetics
Pulmonary Wedge Pressure
Cyclic GMP
Intravenous Infusions
Endothelium
Dogs

Keywords

  • bradykinin
  • chronic instrumentation
  • conscious
  • dog
  • endothelium dependent
  • endothelium independent
  • halothane
  • nitroprusside
  • pentobarbital
  • pressure- flow plots
  • pulmonary circulation

ASJC Scopus subject areas

  • Endocrinology
  • Physiology
  • Orthopedics and Sports Medicine
  • Physical Therapy, Sports Therapy and Rehabilitation

Cite this

Murray, P. A., Fehr, D. M., Chen, B. B., Rock, P., Esther, J. W., Desai, P. M., & Nyhan, D. (1992). Differential effects of general anesthesia on cGMP-mediated pulmonary vasodilation. Journal of Applied Physiology, 73(2), 721-727.

Differential effects of general anesthesia on cGMP-mediated pulmonary vasodilation. / Murray, P. A.; Fehr, D. M.; Chen, B. B.; Rock, P.; Esther, J. W.; Desai, P. M.; Nyhan, Daniel.

In: Journal of Applied Physiology, Vol. 73, No. 2, 1992, p. 721-727.

Research output: Contribution to journalArticle

Murray, PA, Fehr, DM, Chen, BB, Rock, P, Esther, JW, Desai, PM & Nyhan, D 1992, 'Differential effects of general anesthesia on cGMP-mediated pulmonary vasodilation', Journal of Applied Physiology, vol. 73, no. 2, pp. 721-727.
Murray PA, Fehr DM, Chen BB, Rock P, Esther JW, Desai PM et al. Differential effects of general anesthesia on cGMP-mediated pulmonary vasodilation. Journal of Applied Physiology. 1992;73(2):721-727.
Murray, P. A. ; Fehr, D. M. ; Chen, B. B. ; Rock, P. ; Esther, J. W. ; Desai, P. M. ; Nyhan, Daniel. / Differential effects of general anesthesia on cGMP-mediated pulmonary vasodilation. In: Journal of Applied Physiology. 1992 ; Vol. 73, No. 2. pp. 721-727.
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