Abstract

The aim of the present study was to test whether hypoxanthine-xanthine oxidase (XO) induced a pulmonary vasoconstriction in newborn piglets, and whether this vasoconstriction could be attenuated or abolished by pretreatment of nitric oxide (NO) donor sodium nitroprusside (SNP). Twenty-five anesthetized newborn piglets (1–3 days old) were randomly assigned to the following four groups: the control group received saline intravenously only; the XO group received 0.1 mmol/kg of hypoxanthine subsequent with XO (1.5 U/kg); the SNP group received the same dosages of hypoxanthine/ XO together with SNP intravenously, allopurinol (ALP) group received ALP intravenously prior to hypoxanthine and XO injection. After giving XO, the pulmonary arterial pressure (PAP) and vascular resistance (PVR) increased, while the cardiac index decreased significantly in the XO group. By contrast, these variables were not significantly modified by XO injection in the SNP and ALP groups. The data suggest that oxygen free radicals induce a pulmonary vasoconstriction in newborn piglets, and this vasoconstriction can be prevented by infusion of the NO donor SNP.

Full Text
Paper version not known

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call

Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.