in a retrospective study , the authors reviewed the hospital records of patients treated with continuous intravenous heparin for the management of thromboembolic disorders during two periods : one period in which the laboratory used an aptt reagent with low in vitro sensitivity to heparin ( lsh ) and another period in which the authors used an aptt reagent with high sensitivity to heparin ( hsh ) .
C0040038
thromboembolic disorders
C0019134
heparin