Abstract
After a short summary of the effects and metabolism of sodium nitroprusside (SNP) and nitroglycerin (NTG), the influence of induced hypotension on hemodynamics and on the microcirculation is investigated. The continuous registration of the local tissue pO2 in skeletal muscle, myocardium, and liver with the multiwire surface electrode provides the opportunity to recognize immediately a change in the microcirculatory bed. This new method shows in animal experiments that the local oxygen supply during SNP-induced hypotension is dramatically reduced, while the arterial pO2 remains in a normal range. These changes are not found during NTG-induced hypotension. Electron microscopic examination of various organs, and especially of the myocardium, shows that the alterations of the oxygen supply found after application of SNP were connected with changes in the ultrastructure.
Résumé
Après un bref résumé sur les effets et le métabolisme du sodium-nitroprusside (SNP) et de la nitroglycérine (NTG), l'influence de l'hypotension provoquée sur les hemodynamiques et sur la microcirculation est examinée en détail. L'enregis-trement continu du PO2 du tissu local dans les muscles squelettiques, le myocarde et le foie au moyen de l'électrode de surface à multiples fils métalliques donne l'occasion de reconnaître immédiatement un changement dans la couche microcirculaire. Cette nouvelle méthode montre que, dans les expériences pratiquées sur les animaux, l'approvisionnement local en oxygène pendant l'hypotension provoquée par le SNP est considérablement réduit tandis que le PO2 artériel demeure dans une zone normale. Ces changements ne sont pas présents dans l'hypotension provoquée par la nitroglycerine. L'examen de divers organes (et particulièrement du myocarde) à l'électron microscopique révèle que la modification de l'approvisionnement en oxygène constaté après l'application du SNP était liée à des changements dans l'ultrastructure.
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Supported by a grant from the Ministerium für Wissenschaft und Forschung des Landes Nordrhein-Westfalen.
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Hauss, J., Schönleben, K., Spiegel, H.U. et al. Nitroprusside- and nitroglycerin-induced hypotension: Effects on hemodynamics and on the microcirculation. World J. Surg. 6, 241–250 (1982). https://doi.org/10.1007/BF01654701
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DOI: https://doi.org/10.1007/BF01654701