The physician writes an order for heparin 900 units/hr. The label on the I.V. bag reads:...
- The physician writes an order for heparin 900 units/hr. The label on the I.V. bag reads: Heparin 10,000 units in 500 mL D5W. How many mL/hr will deliver the correct dose?
- The Order: Amoxicillin 125 mg p.o. every 8 hours for 10 days. The child weighs 40 pounds. Label reads: 125mg/5mL. Safe range is 20-40 mg/Kg/day in divided doses q8h. What is the safe dose range for this child? (round to nearest whole numbers)
Is this dose safe?
- Give Regular insulin by continuous I.V. infusion at 20 units/hr. The solution is 250 mL NS with 250 units of Regular insulin. How many mls/hr. will deliver the correct dose?
Homework Answers
ANSWER.
* Calculation of ml/hr.
ml/hr = Volume(ml) / Time(hr).
Calculation of volume(ml)
Volume(ml) = Desired dose /Dose in hand * Quantity.
Here
Desired dose (D) = 900 units.
Dose in hand (H) = 10000 units.
Quantity (Q) = 500 ml
As per above formula
Volume(ml) of drug required = D/H * Q
= 900/10000 * 500
= 0.09 * 500
= 45 ml.
Time(hr) = 1 hour.
So
ml/hr = 45 ml/hr.
* Calculation of safe dose.
Ordered dose = 125 mg P.O Q8H.
Weight of the patient = 40 pounds.
Convert pound o kg for calculation
1 pound = 0.45 kg
So
Weight of the patient = 40 * 0.45
= 18 kg.
Safe dose required for a child weight 18 kg = 20 * 18 - 40 * 18
= 360 mg - 720 mg/day divided doses (Q8H).
Ordered dose = 125 mg every 8 hrs or three times a day.
= 125 * 3
= 375 mg per day.
* So ordered dose is safe for this patient.
* Calculation of ml/hr.
ml/hr = Volume(ml) /Time(hr)
Calculation of volume(ml)
Volume(ml) = Desired dose /Dose in hand * Quantity.
Here
Desired dose (D) = 20 units.
Dose in hand (H) = 250 units.
Quantity (Q) = 250 ml
As per above formula
Volume(ml) of drug required = D/H * Q
= 20/250 * 250
= 0.08 * 250
= 20 ml
Time(hr) = 1 hour.
So
ml/hr = 20 ml/hr.
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