The nurse is caring for a client receiving Magnesium Sulphate. The loading dose has already been given and the maintenance dose order reads 1g/hr. The drug is supplied 20g/500ml
Solve the maintenance dose to be given in ml/hr
25mg/hr
25g/hr
250ml/hr
25ml/hr
The Correct Answer is D
A. 25mg/hr is incorrect. The question asks for the volume in mL/hr, not the dose in milligrams per hour.
B. 25g/hr is incorrect. The ordered dose is 1g/hr, not 25g/hr.
C. 250mL/hr would provide a much higher dose than ordered, based on the concentration.
D. 25mL/hr is correct. This is the calculated volume to deliver the 1g/hr maintenance dose based on the supplied concentration. Volume= Ordered dose/ Concentration
Determine the concentration of the solution: The supplied concentration is 20g/500mL, which simplifies to 0.04g/mL (since 20g = 20,000mg and 500mL = 500mL).
Determine the ordered dose: The order is for a maintenance dose of 1g/hr.
Calculate the volume to be infused: 1/0.04= 25mL/hr
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. 50mg/hr is not the correct unit for volume, it’s the dose in milligrams.
B. 50 mL/hr is the correct volume to administer to achieve the ordered dose of 2g/hr. Determine the concentration of the solution: The supply is 10g in 250mL. This means the concentration is 10g / 250mL, or 0.04g/mL (since 10g = 10,000mg, this is equivalent to 40mg/mL). Convert the ordered dose to match the concentration: The order is for 2g/hr (which is 2,000mg/hr). Calculate the volume to be infused to deliver the desired dose: Dose = Ordered/concentration= 2000/40= 50 mL/hr
C. 5mg/mL refers to the concentration, not the rate of infusion.
D. 5 mL/hr would administer only 200mg/hr, which is much lower than the ordered dose of 2g/hr.
Correct Answer is A
Explanation
A. Have her blood checked every month for the next 360 days is correct. After a molar pregnancy (also known as a hydatidiform mole), the client must have serial monitoring of hCG levels (usually monthly for 6 to 12 months) to ensure that all molar tissue has been removed and that gestational trophoblastic disease (such as choriocarcinoma) does not develop. A rising or persistently elevated hCG level can indicate malignancy.
B. Receive Rhogam with the next pregnancy may be necessary if the client is Rh-negative, but it is not specific or essential to the follow-up care for a molar pregnancy itself.
C. Seek genetic counselling with her partner before the next pregnancy is not routinely required after a molar pregnancy unless there’s a history of recurrent molar pregnancies or other genetic concerns.
D. Becoming pregnant within the year is discouraged. Pregnancy should be avoided for at least 6 to 12 months after molar pregnancy to allow for monitoring of hCG levels without interference from a new pregnancy, which could complicate interpretation of results.
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