Distant effects of nitric oxide inhalation in lavage induced lung injury in anaesthetised pigs
2013 (English)In: Acta Anaesthesiologica Scandinavica, ISSN 0001-5172, E-ISSN 1399-6576, Vol. 57, no 3, 326-333 p.Article in journal (Refereed) Published
Background Inhalation of nitric oxide (INO) exerts both local and distanteffects. INO in healthy pigs causes down-regulation of endogenous nitric oxide(NO) production and vasoconstriction in lung regions not reached by INO, especially in hypoxic regions, which augments hypoxic pulmonary vasoconstriction. In contrast, in pigs with endotoxemia-induced lung injury, INO causes increased NO production in lung regions not reached by INO. The aim ofthis study was to investigate whether INO exerts distant effects in surfactant-depleted lungs. Methods Twelve pigs were anaesthetised, and the left lower lobe (LLL) was separately ventilated. Lavage injury was induced in all lung regions, except the LLL. In six pigs, 40 ppm INO was given to the LLL (INO group), and theeffects on endogenous NO production and blood flow in the lavage-injured lungregions were studied. Six pigs served as a control group. NO concentration inexhaled air (ENO), NO synthase (NOS) activity and cyclic guanosine monophosphate (cGMP) in lung tissue, and regional pulmonary blood flow were measured. Results The calcium (Ca2+)-dependent NOS activity was lower (P<0.05) in the lavage-injured lung regions in the INO group than in the control group. There were no measurable differences between the groups for Ca2+-independent NOS activity, cGMP, ENO, or regional pulmonary blood flow. Conclusions Regional INO did not increase endogenous NO production in lavage-injured lung regions not directly reached by INO, but instead down-regulated the constitutive calcium-dependent nitric oxide synthase activity, indicating that NO may inhibit its own synthesis.
Place, publisher, year, edition, pages
2013. Vol. 57, no 3, 326-333 p.
Nitric oxide, Nitric oxide synthase, Lavage induced lung injury, pulmonary blood flow, exhaled nitric oxide, cyclic guanosine monophosphate
Anesthesiology and Intensive Care
Research subject Anaesthesiology and Intensive Care
IdentifiersURN: urn:nbn:se:uu:diva-157085DOI: 10.1111/aas.12030ISI: 000314652400009OAI: oai:DiVA.org:uu-157085DiVA: diva2:434612