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The healthcare provider orders dobutamine at 12 mcg/kg/min. The client weighs 75 kg. The pharmacy provides 250 mL of D5W with 1 g of dobutamine. How many mL/hr should the IV pump be programmed for? (Round to a whole number.)

A.

13

B.

140

C.

14

D.

134

Answer and Explanation

The Correct Answer is C

A. This is an underestimation due to a miscalculation of the dose rate.

B. This is an overestimation due to a miscalculation of the dose rate.

C. 1. Calculate the desired dose of dobutamine:

Desired dose (mcg/min) = Dose per kg (mcg/kg/min) x Weight (kg)

Desired dose (mcg/min) = 12 mcg/kg/min x 75 kg = 900 mcg/min

2. Convert mcg/min to mg/hr:

900 mcg/min x 60 min/hr = 54,000 mcg/hr

54,000 mcg/hr ÷ 1000 mcg/mg = 54 mg/hr

3. Calculate the concentration of dobutamine in the solution:

Concentration (mg/mL) = Total amount of dobutamine (mg) / Total volume (mL)

Concentration (mg/mL) = 1000 mg (1 g) / 250 mL = 4 mg/mL

4. Calculate the infusion rate (mL/hr):

Infusion rate (mL/hr) = Desired dose (mg/hr) / Concentration (mg/mL)

Infusion rate (mL/hr) = 54 mg/hr / 4 mg/mL = 13.5 mL/hr

5. Round to the nearest whole number:

Infusion rate (mL/hr) = 14 mL/hr

Therefore, the IV pump should be programmed for 14 mL/hr.

D. This is an overestimation due to a miscalculation of the dose rate.


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Correct Answer is D

Explanation

A. Magnetic resonance imaging (MRI) may be used in some cases, but TRUS is more commonly used to guide biopsies after concerns arise from DRE or PSA findings.

B. Uroflowmetry studies measure urine flow, which is not the primary concern in evaluating an enlarged prostate related to potential cancer.

C. Cystourethroscopy is used to evaluate the bladder or urethra and is not typically needed in the assessment of an enlarged prostate.

D. Transrectal ultrasonography (TRUS) is commonly used in the evaluation of prostate abnormalities, especially when there are concerns about prostate cancer due to an abnormal DRE or elevated PSA. It helps in visualizing the prostate and guiding biopsy.

Correct Answer is A

Explanation

A. The best response is to educate the client about the cause of Prinzmetal angina. It occurs due to spasm in the coronary arteries, which is different from the plaque buildup seen in traditional coronary artery disease. This response addresses the client's concern in an accurate and reassuring manner.

B. While healthy eating is important, Prinzmetal angina is not typically caused by cholesterol or plaque buildup. This response could increase the client's anxiety.

C. While acknowledging the client's emotions is important, this response does not address the underlying concern or provide an accurate explanation of Prinzmetal angina.

D. Offering reassurance without providing accurate information about the condition does not help the client understand the cause of their symptoms and could leave them confused or anxious.

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