[An experimental study on the delayed resuscitation of dogs with burn shock].

Objective: To explore the effects of delayed resuscitation on burn shock with ringer's solution.
Methods: Twelve mongrel dogs were randomly divided into control (S, n = 6) and treatment (LR, n = 6) groups. The dogs in LR group were inflicted by 35% TBSA III degree burn and were resuscitated with Lactate Ringer's solution. Urine output in amount of 1 ml.kg-1.h-1, and cardiac output at level of 70% approximately 80% of pre-burn level were referred for the modulation of the speed and amount of fluid infusion. The postburn changes of volumetric load, mean arterial pressure (MAP), LVSP +/- dp/dtmax, CI, DO2 and VO2 during the first 24 hours of resuscitation were observed.
Results: The infusion amount of LR solution was 8.87 +/- 1.02 ml/kg per 1% TBSA during the first 24 hours of resuscitation, which was 1.2 times more than that with Parkland formula. Furthermore, the infusion fluid amount within the first 4 hours of resuscitation was (3.63 +/- 0.99) ml.kg(-1).1% TBSA-1, which was 41% of total amount within the first 24 hours. MAP, LVSP, +/- dp/dtmax, CI, DO2 and VO2 reached or approached the levels in S group within 2 hours of resuscitation.
Conclusion: The infusion amount of Lactate Ringer's solution needed in delayed resuscitation was larger than that in early resuscitation. And the indices of hemodynamics and myocardial mechanics were improved obviously within 2 hours of resuscitation.