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In lab studies, hydroxyethyl starch has direct harmful effects on kidney cells
Date:7/11/2014

July 11, 2014 The increased risk of kidney injury related to the use of hydroxyethyl starch (HES) in resuscitation fluids reflects the mass of HES molecules, according to a report in Anesthesia & Analgesia, official journal of the International Anesthesia Research Society (IARS).

The "total mass of HES molecules" explains the harmful effect of HES on cultured human renal proximal tubule cells (PTCs), concludes the laboratory study by Dr Christian Wunder and colleagues of University Hospital Wrzburg, Austria. Other factorssuch as differences in the origin or molecular weight of HES solutionsappear to play little or no role in cellular-level toxicity of HES.

What Factors Affect Toxic Effects of HES on Kidney Cells?

Hydroxyethyl starch is a starch derivative that has been widely used for fluid resuscitation with volume expansion for critically ill or injured patients in shock. A growing body of evidence suggests that HES solutions may have harmful effects, including an increased risk of kidney injury and death.

In previous studies, Dr Wunder and colleagues found that HES caused impaired kidney function in animals with sepsis (severe infection). Those studies showed that HES was localized mainly in the kidney PTCs. The researchers performed a series of in-depth follow-up experiments to look at factors influencing the toxic effects of HES on cultured human PTCs.

Most of the factors assessed had no major influence on reductions in cell viability caused by HES. Cellular toxicity was unrelated to the type of "carrier" solution used in the cell cultures, the use of HES made from different origins (potato versus corn starch), or the time cells spent in culture with HES.

The toxic effects were also similar for HES solutions of different molecular weights. That's an important finding, as newer low-molecular weight HES solutions were thought to be safer than previous products. There was also no evidence
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Contact: Connie Hughes
Connie.Hughes@wolterskluwer.com
646-674-6348
Wolters Kluwer Health
Source:Eurekalert

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