9. The physician ordered heparin 15 units/kg/hr for a patient who suffered an MI. On hand is 25,000 units of Heparin in 500 mL D5W. The patient weighs 157 lbs. What is the IV flow rate in mL/hr?
ANSWER.
* Calculation of ml/hr.
ml/hr = Volume(ml) / Time(hr).
Calculation of volume(ml)
Volume(ml) = Desired dose/Dose in hand * Quantity.
Here
Ordered dose = 15 unit/kg/hr.
Weight of the patient = 157 lbs.
Convert lbs to kg for calculation
1 lbs = 0.45 kg
Weight of the patient = 157 * 0.454
= 71.3 kg
Desired dose(D) for this patient = 15 * 71.3
= 1069.5 units/hr.
Dose in hand (H) = 25000 units
Quantity (Q) = 500 ml
As per above formula
Volume(ml) of drug required = D/H * Q
= 1069.5/25000 * 500
= 0.043 * 500
= 21.5 ml
Time(hr) = 1 hr.
So
Flow rate (ml/hr) = 21.5 ml/hr.
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