RESUMO
To explore the hemodynamic characteristics during burn shock stage in dogs immigrated onto high altitude, dogs scalded with 40% TBSA of Ⅲ degree burn (n=8) were randomly divided into a high altitude treatment group (H group) and a flatlands treatment group (F group) . All subjects were infused with lactated Ringefs solution at 1 postburn hour according to the Parkland formula. The changes in hemodynamic parameters, organ water content, pulmonary microvascular permeability, serum activity of PLA2 and CK-MB were determined. The results showed that under simulated high altitude condition sustained hypoxemia and acidosis as well as hypoxic damage of myocardial function were present before scalding, and sustained increase of PAP, PCWP and RVWI, even pulmonary hypertension and lung edema were found at 24 postburn hour in H group. At 48 postburn hour, the organ water content of heart, lung, etc increased more remarkably but urine output decreased more obviously in H group than those in F group. Serum activity of PLA2 and CK-MB increased gradually after burn. It is suggested that tissue edema may easily supervene with infusion according to Parkland formula under plateau condition. Hypoxic damage of organs should be corrected by increase of colloid volume resuscitation and dehydration treatment. Administration of hypertonic solution is able to correct burn shock.