There are many articles treating on the thermal injuries caused by hypo-hyperthermia units, but are few which discuss on the electrical safety and the performance of this system.Recently we have had a chance to compare with the quality of each two units of four types which are in use in Knki University Hospital and Kyoto University Hospital : Gaymer HSO-3000C, Therm-O-Rite, Blanketrol Model 200,Atom HC-250.All units were measured the elelctric leakage current in circulating fluid in grounding state and were found more than 100μA leakage current under opengrounding condition (measured by Safety Analyser Model 431F, Dempsey Co.).From these findings we would like to propose the additional safe guard gounding and the periodic electrical check and the cleaning of air inlet of radiator not only for the maintenance of the performance and also for the electrical safety.Gaymer's product exhibited relatively good cooling and heating power among eight units of four types. As all four types have their separate characteristics, so it is preferable to select the units or to construct it according to the purpose.
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