a patient is receiving heparin per continuous intravenous infusion at 16.5 ml/hr. the patient's aptt is 124. the patient weighs 51.8 kg. per the weight-based heparin therapy protocol, the heparin infusion rate is to be decreased by 2 units/kg/hr. heparin for intravenous infusion is available as 25,000 units in 250 ml of 0.45% sodium chloride (1/2 ns). what would the heparin infusion rate (ml/hr) be after the adjustment of 2 units/kg/hr? (round answer to the nearest tenth.)