A client who is receiving an IV infusion of heparin sodium 25,000 units in 5% dextrose injection 500 mL at 1,000 units/hour has a partial thromboplastin time (PTT) of 10 seconds. The sliding scale prescription reads, "If the PTT is less than 65 seconds, increase the rate by 200 units/hour; and if the PTT is greater than 95 seconds, decrease the rate by 200 units/hour." The nurse should regulate the infusion pump for how many mL/hour? (Enter numerical value only.)

To calculate the infusion rate, we need to use the formula: Infusion rate (mL/h) = Dose (units/h) x Volume (mL) / Concentration (units) First, we need to adjust the dose according to the sliding scale prescription based on the PTT result. In this case, since the PTT is less than 65 seconds, we need to increase the dose by 200 units/hour. Therefore, the new dose is 1,000 units/hour + 200 units/hour = 1,200 units/hour. Plugging in the given values, we get: Infusion rate (mL/h) = 1,200 units/h x 500 mL / 25,000 units Simplifying, we get: Infusion rate (mL/h) = 24 mL/h