• De-wei Wang, Chang-hui Wang, Xiang-sheng Ding, Yong-dong Pei, Shi-hui Zhu, Shi-kang Liu, and Sheng-de Ge.
• Department of Burns, The First Municipal People's Hospital, Lianyungang 222002, Jiangsu, China. dwwang0518@yahoo.com.cn
• Zhongguo Wei Zhong Bing Ji Jiu Yi Xue. 2005 Dec 1;17(12):756-8.

ObjectiveTo investigate the changes in myocardial dynamics in early phases of burn shock of dogs and the effects of rapid fluid infusion in delayed resuscitation.MethodsTwelve mongrel dogs were randomly divided into control (n=6) and burn (n=6) groups. The dogs in burn group were subjected to 35% total body surface area (TBSA) III degree burn and were resuscitated with lactate Ringer's solution 6 hours postburn. The volumes and rates of fluid infusion were controlled basically on the urinary output of 1.0 mlxkg(-1)xh(-1) and cardiac output (CO) of 70%-80% of pre-burn values. The mean arterial pressure (MAP), left ventricular systolic pressure (LVSP), maximum rate of intraventricular pressure rise/down (+/-dp/dt max) and cardiac index (CI) were determined at 0.5, 1,2, 6, 7, 8, 10 and 24 hours postburn.ResultsThe MAP, LVSP, +/-dp/dt max and CI were significantly lowered from their baseline and those of control group at 0.5 hour postburn, and they kept declining until 6 hours postburn. They showed a tendency of elevation and reached or approached the levels of that in control group within 2 hours of resuscitation, and the differences were not significant between the two groups 4 hours after burn (all P>0.05). The amount of infusion fluid within the first 4 hours of resuscitation was (3.63+/-0.99) ml/kg per 1% TBSA.ConclusionThe myocardial dynamics is depressed in the early stage of burn, the effective way to improve it is to infuse a large amount of fluid rapidly when resuscitation is delayed.

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