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  • Title: [Comparative effects of low and medium molecular hydroxyethyl starch (HES) solutions on hemorrhagic shock in rats].
    Author: Yoneko M, Suzuki Y, Kojima J.
    Journal: Masui; 2012 Jan; 61(1):57-63. PubMed ID: 22338861.
    Abstract:
    BACKGROUND: Hydroxyethyl starch (HES) solutions are frequently used plasma expanders. We examined the effects of medium-HES (mean molecular weight of 130,000 dalton) and low-HES (mean molecular weight of 70,000 dalton) on the survival rates (Exp. I), colloid osmotic pressure (COP) (Exp. II) and coagulation (Exp. III) with rats in hemorrhagic shock. METHODS: Hemorrhagic shock was induced by removing 55% (Exp. I) and 20% (Exp. II and III) of the circulating blood volume. Saline, low-HES or medium-HES of the same volume with the removed blood was intravenously infused immediately after bleeding. RESULTS: Exp. I: In survival rate, effect of medium-HES was significantly superior to that of saline. Exp. II: The COP of medium-HES group was significantly higher than that of saline group 3 hrs after hemorrhagic shock. Exp. III: There were no changes in von Willerbrand factor and factor VIII 3 hrs after hemorrhagic shock among saline, low-HES and medium-HES. CONCLUSIONS: Medium-HES and low-HES are efficacious plasma volume substitutes; however, the ability of medium-HES to prolong maintenance of COP better than low-HES is a finding that would be significant in a clinical setting involving preoperative blood management and extreme blood loss.
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