Hydroxyethyl starch (HES/HAES) is a nonionic starch derivative. It is one of the most frequently used volume expander under the trade names Hespan by B. Braun Medical Inc. and Voluven or Volulyte by Fresenius Kabi. HES is a general term and can be sub-classified according to average molecular weight, molar substitution, concentration, C2/C6 ratio and Maximum Daily Dose. Distinguishing which preparation is used for treatment is key to understanding the potential for adverse effects.
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