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Reduced resuscitation fluid volume for second-degree experimental burns with delayed initiation of vitamin C therapy (beginning 6 h after injury).

We studied the hemodynamic effects of delayed initiation (6 h postburn) of antioxidant therapy with high-dose vitamin C in second-degree thermal injuries. Seventy percent body surface area burns were produced by subxiphoid immersion of 12 guinea pigs into 100 degrees C water for 3 s. The animals were resuscitated with Ringer's lactate solution (R/L) according to the Parkland formula (4 ml/kg/% burn during the first 24 h) from 6 h postburn, after which the resuscitation fluid volume was reduced to 25% of the Parkland formula volume. Animals were divided into two groups. The vitamin C group (n = 6) received R/L to which vitamin C (340 mg/kg/24 h) was added after 6 h postburn. The control group (n = 6) received R/L only. Both groups received identical resuscitation volumes. Heart rates, mean arterial blood pressure, cardiac output, hematocrit level, and water content of burned and unburned tissue were measured before injury and at intervals thereafter. No animals died. There were no significant differences in heart rates or blood pressures between the two groups throughout the 24-h study period. The vitamin C group showed significantly (P < 0.05) lower hematocrits 8 and 24 h postburn, and higher cardiac outputs after 7 h postburn. At 24 h postburn, the burned skin in the vitamin C group had a significantly (P < 0.05) lower water content (73.1 +/- 1.1) than that of the control group (76.0 +/- 0.8). In conclusion, delayed initiation of high-dose vitamin C therapy beginning 6 h postburn with 25% of the Parkland formula volume significantly reduced edema formation in burned tissue, while maintaining stable hemodynamics.

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