A nurse is preparing to administer 0.9% sodium chloride (0.9% NaCl) 1.5 L IV to infuse over 6 hr. The drop factor of the manual IV tubing is 20 gtt/mL. The nurse should set the manual IV infusion to deliver how many gtt/min? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
A nurse is preparing to administer famotidine 20 mg by intermittent IV bolus over 15 min. Available is famotidine 20 mg in 100 ml dextrose 5% (D,W). The nurse should set the IV pump to deliver how many m/hr (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
ANSWER.
* Calculation of gtt/min.
Formula
gtt/min = Volume(ml) / Time(min) * Drop factor(gtt/ml).
Here
Volume(ml) = 1500 ml
Time(min) = 360 min (6hr)
Drop factor = 20 gtt/ml.
As per above formula
gtt/min = 1500 / 360 * 20
= 4.16 * 20
= 83.2
= 83 gtt/min.
* Calculation of ml/hr.
ml/hr = Volume(ml) /Time(hr).
Calculation of volume
Volume(ml) = Desired dose/Dose in hand * Quantity.
Here
Desired dose (D) = 20 mg.
Dose in hand (H) = 20 mg.
Quantity(Q) = 100 ml.
As per above formula
Volume(ml) = D/H * Q
= 20/20 * 100
= 1 * 100
= 100 ml
Time(hr) = 0.25 hr (15 min)
ml/hr = 100 / 0.25
= 400 ml/hr.
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