Abstract
A scald burn injury was applied to 22–23 per cent of the body surface area of anaesthetized rats. The cardiac output was 38–60 per cent lower in the burn injury group than in the control group, heart rate and mean arterial blood pressure were only slightly affected, but burn injury caused a significant increase in total peripheral resistance. The involvement of oxygen-free radicals in this immediate fall in cardiac output was investigated. Pretreatment with a blocker of free radical production, allopurinol or the infusion of the free radical scavengers superoxide dismutase plus catalase caused no cardiovascular improvement, suggesting that oxygen free radicals are not involved in the fall in cardiac output after burn injury. Allopurinol treatment, however, prevented the rise in total peripheral resistance seen after burn injury.
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