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• W3032081975 abstract "ObjectiveTo investigate the effects of sodium valproate on visceral tissue perfusion and survival rate of abdominal organs in rats with delayed fluid resuscitation after severe burn-blast combined injury.MethodsA total of 360 male SD rats, (1) Experiment one, 300 rats were selected and divided into sham injury + delayed fluid resuscitation group (SD group, n=50), sham injury + sodium valproate + delayed fluid resuscitation group (SPD group, n=50), burn-rush combined injury + delayed fluid resuscitation group (BD group, n=100) and burn-rush combined injury + sodium valproate + delayed fluid resuscitation group (BPD group, n=100) according to the random number table method. The SD group and SPD group were soaked the back of rats in the 37 ℃ water for 12 s and the abdomen for 6 s. The BD group and BPD group were blasted with 5 g high explosive at a distance of 50 cm from the rat to cause moderate impact injury, and then immediately immersed the back of rats in boiling water at 94 ℃ for 12 s, abdominal for 6 s, causing 50% total body surface area of full thickness burns. SPD group and BPD group were injected subcutaneously with sodium valproate (300 mg/kg) immediately after injury. SD group, SPD group, BPD group and BD group were injected intraperitoneally with 0.9% sodium chloride solution according to the Parkland formula at 6, 24 h after injury for rehydration. Immediately after the injury, 6, 24, 48, 72 h after injury, each time point 10, 10, 20, 20 rats were selected from the SD group, SPD group, BD group, BPD group for visceral blood flow and blood gas analysis. (2)Experiment two, the rest of the 60 rats were divided into 4 groups according to the random number table method: SD group(n=10), SPD group(n=10), BD group(n=20) and BPD group(n=20). The modeling and treatment of the rats in each group was the same as experiment one. Carotid arteries were placed in all rats 48 h before modeling. The mean arterial pressure (MAP) of rats in each group was measured at 5 time points immediately after injury and at 6, 24, 48, 72 h after injury, and the survival rate of each group was also calculated. Data were processed with one-way analysis of variance, t text, the log-rank test and χ2 test.ResultsThe results of experiment one showed: (1) Immediately after injury, there were no statistically significant differences in the blood flow of liver, kidney and small intestine mucosa in the 4 groups (with P values above 0.05). At 6 h after injury, the SD group, SPD group, BD group, and BPD group had statistically significant differences in overall comparison of the liver, kidney, and small intestinal mucosal blood flow groups (F=463.45, 267.27, 449.64; with P values below 0.05). There were no statistically significant differences in blood flow of liver, kidney and small intestine mucosa between BPD group and BD group (with P values above 0.05); At 24 h after injury, the SD group, SPD group, BD group, and BPD group had statistically significant differences in overall comparison of the liver, kidney, and small intestinal mucosal blood flow (F=1 347.52, 125.23, 1 210.84; with P values below 0.05). There were significant differences in blood flow of liver, kidney and small intestine mucosa between BPD group and BD group (t=89.72, 6.57, 10.23; with P values below 0.05); At 48 h after injury, the SD group, SPD group, BD group, and BPD group had statistically significant differences in overall comparison of the liver, kidney, and small intestinal mucosal blood flow (F=1 044.13, 20.69, 174.35; with P values below 0.05). There were statistically statistically significant differences in blood flow between the liver and small intestine mucosa of the BPD group and the BD group (t=51.90, 34.72; with P values below 0.05), and there was no statistically significant difference in renal blood flow (t=0.37, P>0.05); At 72 h after injury, there were statistically significant differences between the liver and kidney blood flow in the SD group, SPD group, BD group, and BPD group (F=328.27, 16.01; with P values below 0.05), there was no statistically significant difference in the small intestinal mucosa blood flow of the 4 groups (P>0.05). There was a statistically significant difference in liver blood flow between BPD group and BD group (t=25.32, P 0.05). (2)Immediately after the injury and 48 h after the injury, there were no statistically significant difference in the overall pH between the 4 groups (with P values above 0.05); at 6, 24 h, and 72 h after injury, the differences of pH between the 4 groups were statistically significant (F=54.48, 5.68, 1.98; with P values below 0.05), and at 6 and 24 h after injury, there were statistically significant differences in pH between the BPD group and the BD group (t= 5.32, 3.51; with P values below 0.05), at 72 h after injury, there was no statistically statistically significant difference in pH between the two groups (P>0.05). Immediately after the injury and at 6, 24 h after injury, the overall comparison between the 4 groups of oxygen partial pressure groups were statistically significant (F=26.55, 16.34, 2.37; with P values below 0.05). There was no statistically significant difference in oxygen partial pressure between the BPD group and the BD group immediately after injury (P>0.05), and the differences between the two groups were statistically significant at 6 and 24 h after injury (t=4.58, 0.62; with P values below 0.05). At 48 and 72 h after injury, there were no statistically significant differences in the overall comparison between the 4 groups of blood lactic acid groups (with P values above 0.05). Immediately after injury, and at 6, 24 h after injury, the overall comparison between the 4 groups were statistically significant (F=3.12, 61.67, 50.83; with P values below 0.05). There was no statistically significant difference in oxygen partial pressure between the BPD group and the BD group immediately after injury (P> 0.05), and the difference between the two groups were statistically significant at 6 and 24 h after injury (t=6.98, 3.56; with P values below 0.05). The results of experiment two showed: (1) Immediately after injury and 72 h after injury, there were no significant differences in the overall comparison of MAP among the 4 groups (with P values above 0.05). At 6, 24, and 48 h after injury, the overall comparison of MAP between the 4 groups were statistically significant (F=292.73, 104.29, 5.01; with P values below 0.05), and the differences in MAP between the BPD group and the BP group were statistically significant (t=6.02, 6.70, 1.24; with P values below 0.05). (2) At 72 h after injury, the survival rates of the BPD group and the BD group were 70% and 50%, respectively. The difference between the 2 groups was statistically significant (χ2=11.03, P<0.05).ConclusionSodium valproate combines with delayed fluid replacement can significantly increase the perfusion of liver, kidney and intestinal mucosa blood in severe burn-blast combined injury rats, maintain stable blood pressure early after injury, reduce blood lactate levels, and improve the survival rate 72 h after injury.Key words: Burns; Valproic acid; Rats; Perfusion; Shock; Survival rate; Blast injury; Blood flow" @default.
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• W3032081975 title "Effect of sodium valproate on visceral tissue perfusion and survival rates in rats with delayed fluid resuscitation after severe burn-blast combined injury" @default.
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