Effects and its mechanisms of hypertonic saline hydroxyethyl starch 200/0.5 solution in rats with ischemic cerebral edema / 中华急诊医学杂志

ABSTRACT

Objective To investigate effects and its mechanisms of hypertonic saline hydroxyethyl starch 200/0.5 solution on intracranial pressure and brain water content in rats with ischemic cerebral edema.Methods All experiments were conducted in the animal experimental center of Sun Yat-sen University.The 28 male Sprague-Dawle (SD) rats were randomly (random number) divided into hypertonic saline hydroxyethyl starch group,hydroxyethyl starch group,control group and sham operation group,each n =7.Ischemic cerebral edema model was reproduced by middle cerebral artery occlusion (MCAO),followed by reperfusion after ischemia for 2 hours (If the moldel was not successful,other rats were operated to fill the missing models).Then reperfusion after ischemia 2 hours and received hypertonic saline hydroxyethyl starch and hydroxyethyl starch via tail vein at the beginning of reperfusion.The colloidal osmotic pressure (COP) and intracranial pressure (ICP) were evaluated on 0,2,6,12,18,24 hours after the surgery.The water content of the right hemisphere was measured on 24 h after the surgery.Results The ICP of hypertonic saline hydroxyethyl starch group,hydroxyethyl starch group and control group were significantly higher than that of sham operation group on 2,6,12,18,24 h after the surgery.The ICP of hypertonic saline hydroxyethyl starch group was significantly lower than those of hydroxyethyl starch group and control group on 2,6,12,18 and 24 h.But there was no significant difference in ICP of the hydroxyethyl starch group compared with that of control group at all time points.The COP of hypertonic saline hydroxyethyl starch group and hydroxyethyl starch group were significantly higher than the control group and sham operation group at each time point; There was no significant difference in COP (mmHg) of the hydroxyethyl starch group compared with that of hypertonic saline hydroxyethyl starch group at all time points.The brain water content (BWC) of hypertonic saline hydroxyethyl starch group,hydroxyethyl starch group and control group were significantly higher than that of sham operation group on 24 hours after the surgery [(81.24±0.36)％,(83.04±0.10)％,(83.14±0.41)％ vs.(78.37±0.37)％,all P=0.000],BWC of hypertonic saline hydroxyethyl starch group lower than these of hydroxyethyl starch group [(81.24±0.36)％ vs.(83.04 ±0.10) ％,P =0.000] and control group [(81.24 ±0.36)％ vs.(83.14 ±0.41) ％,P =0.000].There was no significant difference in BWC of the hydroxyethyl starch group compared with that of control group [(83.04 ± 0.10) ％ vs.(83.14 ± 0.41) ％,P =0.578].Conclusion Hypertonic saline hydroxyethyl starch solution could significantly ameliorate ischemic cerebral edema and reduce ICP,but the relationship between its elevated COP and reduced ICP has not been confirmed.