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vtne 40 math practice Review Questions With Answers|40 Pages

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Vtne

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"Pablo", a 66 pound Labrador mix, is in oliguric renal failure. The veterinarian has asked you to start a constant rate infusion of dopamine at 5 micrograms per kilogram per minute (ug/kg/min) and a fluid rate of 120 mL per hour. Dopamine comes in a concentration of 40 mg/mL. How much dopamine will...

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vtne 40 math practice Review
Questions With Answers

"Pablo", a 66 pound Labrador mix, is in oliguric
renal failure. The veterinarian has asked you to start
a constant rate infusion of dopamine at 5
micrograms per kilogram per minute (ug/kg/min)
and a fluid rate of 120 mL per hour. Dopamine
comes in a concentration of 40 mg/mL. How much
dopamine will you add to a liter of 0.9% sodium
chloride solution? - ✔ ✔ Answer: 1.86 mL

Constant rate infusions are not something that an
entry level technician would typically perform.
However, the VTNE may have some questions on
CRI and it will benefit you to know how to do these
calculations. To solve this problem, break down the
basic parts to make it less overwhelming:

,1) Convert pounds to kilograms- 66 pounds/2.2
pounds per kg = 30 kg
2) Calculate the number of hours an infusion will
last by dividing the volume in the bag (1 Liter, or
1,000 mL) by the rate per hour: 1,000 mL/120mL/hr
= 8.3 hours
3) Now take the number of hours (8.3) and multiply
by 60 to calculate how many minutes this is: 8.3 X
60 = 498 minutes
4) Now plug into the equation: 5 ug/30kg/498min=
74,700 ug
5) Now convert the ug into mg by dividing by 1,000:
74,700/1,000 = 74.7 mg

6) Calculate the quantity of dopamine to add by now
dividing the 74.7 mg by the concentration of the
drug (40mg/mL) : 74.7mg/40mg/mL = 1.86 mL

,To be truly accurate when adding drugs to a bag like
this, you should discard 1.86 mL of fluids from the
bag prior to adding the 1.86 mL of dopamine.
"Zoe", a 40 kg Labrador Retriever is recovering after
a liver mass resection. The doctor asks you to start
"Zoe" on a fentanyl constant rate infusion at 4
micrograms per kilogram per hour (ug/kg/hr). The
concentration of fentanyl is 0.05mg/mL. The fluid
rate is currently set at 100 mL/hour. How much
fentanyl will you add to a liter of Normosol-R? - ✔
✔ Answer: 32 mL

Constant rate infusions are not something that an
entry level technician would typically perform.
However, the VTNE may have some questions on
CRI and it will benefit you to know how to do these
calculations. To solve this problem, break down the
basic parts to make it less overwhelming:

, 1) Convert pounds to kilograms- Note that in this
problem the units are already in kg so no conversion
is necessary. Make sure to pay attention to this.
2) Calculate the number of hours an infusion will
last by dividing the volume in the bag (1 Liter, or
1,000 mL) by the rate per hour: 1,000 mL/100mL/hr
= 10 hours
(If the problem asks for a dose per minute, you will
need to multiply the hours by 60 to convert to
minutes, but since this problem asks for
ug/kg/HOUR, you do not need to further convert)
4) Now plug into the equation: 4 ug/40kg/10 hours=
1600 ug
5) Now convert the ug into mg by dividing by 1,000:
1600/1,000 = 1.6 mg

6) Calculate the quantity of fentanyl to add by now
dividing the 1.6 mg by the concentration of the drug
(0.05 mg/mL) : 1.6mg/0.05mg/mL = 32 mL

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