ABSTRACT
Objective To study the therapeutic effects of hypertonic sodium acetate dextran (HAD) in combination with dopamine (DA) on hemorrhagic shock complicated by pulmonary edema in the rats first entering high altitude. Methods Forty-two SD rats, first transported to Lhasa, Tibet (3 760 meters above the sea level), were anesthetized with sodium pentobarbital (30 mg/kg, ip). Hemorrhagic shock model with pulmonary edema was induced by hemorrhage (blood pressure at 50 mm Hg) plus intravenous injection of oleic acid (5 _l/100 g) for 1 hour. All the rats were equally divided into 6 groups, ie, normal control (no hemorrhage or oleic acid), hemorrhagic shock with pulmonary edema (HSPE), HSPE plus lactated Ringer's solution (LR, 4 ml/kg), HAD (4 ml/kg) alone, DA (2 mg/kg) alone and the combined use of HAD and DA groups. After drug administration, the hemodynamic parameters including mean arterial blood pressure (MAP), left intraventricular systolic pressure (LVSP) and the changes of intraventricular pressure (?dp/dt max) were observed at the 15th, 30th, 60th and 120th minutes respectively, blood gases at the 30th and 120th minutes respectively and the water content of the lung and the brain at the 120th minutes. Results As compared with LR control group, HAD (4 ml/kg) or DA (2 mg/kg) used alone significantly increased MAP, LVSP and ?dp/dt max ( P
