ATI RN Critical Care Dosage
Calculation 3.1 Exam with
Explained Answers
A nurse is preparing to administer esmolol 50 mcg/kg/min by continuous IV infusion to
a client who weighs 110 lb. Available is esmolol 2.5g in dextrose 5% in water 250 mL.
The nurse should set the IV pump to deliver how many mL/hr? (Round the answer to
the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
RATIONALE
To answer this question, we need to calculate the dose of esmolol in mcg/kg/min, then
convert it to mg/hr, and then use the formula:
mL/hr = (dose in mg/hr) x (volume in mL) / (concentration in mg)
First, we convert the client's weight from pounds to kilograms:
110 lb x 1 kg / 2.2 lb = 50 kg
Next, we multiply the client's weight by the prescribed dose to get the dose in mcg/min:
50 kg x 50 mcg/kg/min = 2500 mcg/min
Then, we divide the dose in mcg/min by 1000 to get the dose in mg/min: 2500 mcg/min
/ 1000 = 2.5 mg/min
Finally, we multiply the dose in mg/min by 60 to get the dose in mg/hr: 2.5 mg/min x
60 = 150 mg/hr
Now, we can use the formula to find the infusion rate in mL/hr:
mL/hr = (150 mg/hr) x (250 mL) / (2500 mg)
mL/hr = 15
Therefore, the nurse should set the IV pump to deliver 15 mL/hr.
A nurse is preparing to administer 0.9% sodium chloride 100 mL IV to infuse over 15
min to a client. The drop factor of the manual IV tubing is 10 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.)
, RATIONALE
To solve this problem, the nurse needs to use the formula:
gtt/min = (Volume in mL x Drop factor in gtt/mL) / Time in min
Plugging in the given values, we get:
gtt/min = (100 x 10) / 15
gtt/min = 66.67
Rounding to the nearest whole number, we get:
gtt/min = 67
Therefore, the nurse should set the manual IV infusion to deliver 67gtt/min.
A nurse is preparing to administer fentanyl 50 mcg IM to a client. Available is fentanyl
0.05 mg/mL. How many ml should the nurse administer per dose? (Round the answer
to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
RATIONALE
To answer this question, you need to convert the dosage of fentanyl from micrograms
(mcg) to milligrams (mg). One milligram is equal to 1000 micrograms, so 50 mcg is
equal to 0.05 mg. Then, you need to use the formula D/H x Q, where D is the desired
dose, H is the dose on hand, and Q is the quantity. In this case, D is 0.05 mg, H is 0.05
mg/mL, and Q is the volume in milliliters. Plugging these values into the formula, you
get:
0.05 mg / 0.05 mg/mL x Q
Q = 1 mL
Therefore, the nurse should administer 1 mL of fentanyl per dose.
A nurse is preparing to administer 0.9% sodium chloride 750 mL IV to infuse over 2
hr. The nurse should set the IV pump to deliver how many mL/hr? (Round the answer
to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
RATIONALE
Calculation 3.1 Exam with
Explained Answers
A nurse is preparing to administer esmolol 50 mcg/kg/min by continuous IV infusion to
a client who weighs 110 lb. Available is esmolol 2.5g in dextrose 5% in water 250 mL.
The nurse should set the IV pump to deliver how many mL/hr? (Round the answer to
the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
RATIONALE
To answer this question, we need to calculate the dose of esmolol in mcg/kg/min, then
convert it to mg/hr, and then use the formula:
mL/hr = (dose in mg/hr) x (volume in mL) / (concentration in mg)
First, we convert the client's weight from pounds to kilograms:
110 lb x 1 kg / 2.2 lb = 50 kg
Next, we multiply the client's weight by the prescribed dose to get the dose in mcg/min:
50 kg x 50 mcg/kg/min = 2500 mcg/min
Then, we divide the dose in mcg/min by 1000 to get the dose in mg/min: 2500 mcg/min
/ 1000 = 2.5 mg/min
Finally, we multiply the dose in mg/min by 60 to get the dose in mg/hr: 2.5 mg/min x
60 = 150 mg/hr
Now, we can use the formula to find the infusion rate in mL/hr:
mL/hr = (150 mg/hr) x (250 mL) / (2500 mg)
mL/hr = 15
Therefore, the nurse should set the IV pump to deliver 15 mL/hr.
A nurse is preparing to administer 0.9% sodium chloride 100 mL IV to infuse over 15
min to a client. The drop factor of the manual IV tubing is 10 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.)
, RATIONALE
To solve this problem, the nurse needs to use the formula:
gtt/min = (Volume in mL x Drop factor in gtt/mL) / Time in min
Plugging in the given values, we get:
gtt/min = (100 x 10) / 15
gtt/min = 66.67
Rounding to the nearest whole number, we get:
gtt/min = 67
Therefore, the nurse should set the manual IV infusion to deliver 67gtt/min.
A nurse is preparing to administer fentanyl 50 mcg IM to a client. Available is fentanyl
0.05 mg/mL. How many ml should the nurse administer per dose? (Round the answer
to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
RATIONALE
To answer this question, you need to convert the dosage of fentanyl from micrograms
(mcg) to milligrams (mg). One milligram is equal to 1000 micrograms, so 50 mcg is
equal to 0.05 mg. Then, you need to use the formula D/H x Q, where D is the desired
dose, H is the dose on hand, and Q is the quantity. In this case, D is 0.05 mg, H is 0.05
mg/mL, and Q is the volume in milliliters. Plugging these values into the formula, you
get:
0.05 mg / 0.05 mg/mL x Q
Q = 1 mL
Therefore, the nurse should administer 1 mL of fentanyl per dose.
A nurse is preparing to administer 0.9% sodium chloride 750 mL IV to infuse over 2
hr. The nurse should set the IV pump to deliver how many mL/hr? (Round the answer
to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
RATIONALE
