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Am. J. Respir. Crit. Care Med., Volume 158, Number 5, November 1998, 1578-1584

Hypercapnic Acidosis May Attenuate Acute Lung Injury by Inhibition of Endogenous Xanthine Oxidase

KEIZO SHIBATA, NUALA CREGG, DOREEN ENGELBERTS, AKINORI TAKEUCHI, LUDWIK FEDORKO, and BRIAN P. KAVANAGH

Respiratory Research Unit, Department of Anaesthesia, and the MSICU, Toronto Hospital; and Department of Anaesthesia, University of Toronto, Toronto, Ontario, Canada

Relative hypoventilation, involving passively---or "permissively"---generated hypercapnic acidosis (HCA), may improve outcome by reducing ventilator-induced lung injury. However, the effects of HCA per se on pulmonary microvascular permeability (Kf,c) in noninjured or injured lungs are unknown. We investigated the effects of HCA in the isolated buffer-perfused rabbit lung, under conditions of: (1) no injury; (2) injury induced by warm ischemia-reperfusion; and (3) injury induced by addition of purine and xanthine oxidase. HCA (fraction of inspired carbon dioxide [FICO2] 12%, 25% versus 5%) had no adverse microvascular effects in uninjured lungs, and prevented (FICO2 25% versus 5%) the increase in Kf,c following warm ischemia-reperfusion. HCA (FICO2 25% versus 5%) reduced the elevation in Kf,c , capillary (Pcap), and pulmonary artery (Ppa) pressures in lung injury induced by exogenous purine/xanthine oxidase; inhibition of endogenous NO synthase in the presence of 25% FICO2 had no effect on Kf,c , but attenuated the reduction of Pcap and Ppa. HCA inhibited the in vitro generation of uric acid from addition of xanthine oxidase to purine. We conclude that in the current models, HCA is not harmful in uninjured lungs, and attenuates injury in free-radical-mediated lung injury, possibly via inhibition of endogenous xanthine oxidase.




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