Administration of tetrastarch at 40ml/kg bwt resulted in a prolonged K-time ( P = 0.049 ) at 6h post infusion , and decreased maximum amplitude at 0 ( P < 0.001 ) , 1 ( P = 0.022 ) , 6 ( P = 0.006 ) , 24 ( P < 0.001 ) and 48h ( P = 0.013 ) post infusion compared with baseline .