What measurement is the normal range for cardiac output in adults?

0.5-1 L/min

10-12 L/min

4-6 L/min

15-20 L/min

Answer and Explanation

The Correct Answer is C

Choice A Reason:
The range of 0.5-1 L/min is significantly lower than the normal cardiac output for adults. Such low values could indicate severe heart failure or other critical conditions where the heart is unable to pump sufficient blood to meet the body's needs.

Choice B Reason:
A cardiac output of 10-12 L/min is higher than the normal range for adults at rest. This level of cardiac output might be seen during intense physical activity or in conditions like hyperthyroidism, where the heart pumps more blood to meet increased metabolic demands.

Choice C Reason:
The normal range for cardiac output in adults is typically between 4-6 L/min. This range represents the volume of blood the heart pumps per minute at rest, ensuring adequate perfusion of tissues and organs. Cardiac output can vary based on factors such as age, body size, and physical activity.

Choice D Reason:
A cardiac output of 15-20 L/min is extremely high and would generally be seen only during extreme physical exertion or in pathological conditions. Such high values are not typical for resting adults and indicate a state of increased cardiac demand.

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Correct Answer is ["0.2"]

Explanation

Step-by-Step Calculation:

Step 1: Convert the client's weight from pounds to kilograms.

220 lbs ÷ 2.2 = 100 kg

Result = 100 kg

Step 2: Calculate the concentration of Lidocaine in mcg/mL.

750 mg × 1000 = 750,000 mcg

Result = 750,000 mcg

750,000 mcg ÷ 500 mL = 1500 mcg/mL

Result = 1500 mcg/mL

Step 3: Calculate the infusion rate in mcg/min.

5 mcg/min (prescribed dose)

Result = 5 mcg/min

Step 4: Calculate the infusion rate in mcg/hr.

5 mcg/min × 60 min/hr = 300 mcg/hr

Result = 300 mcg/hr

Step 5: Calculate the infusion rate in mL/hr.

300 mcg/hr ÷ 1500 mcg/mL = 0.2 mL/hr

Result = 0.2 mL/hr

Final Results:

- Infusion rate: 5 mcg/min

- Infusion rate: 300 mcg/hr

- Infusion rate: 0.2 mL/hr

Correct Answer is ["20.46"]

Explanation

Step 1: Convert the client's weight from pounds to kilograms.

150 pounds ÷ 2.2 = 68.18 kg

Result at each step = 68.18 kg

Step 2: Calculate the dose in mcg/min.

3 mcg/kg/min × 68.18 kg = 204.54 mcg/min

Result at each step = 204.54 mcg/min

Step 3: Convert the dose from mcg to mg.

204.54 mcg ÷ 1000 = 0.20454 mg/min

Result at each step = 0.20454 mg/min

Step 4: Calculate the infusion rate in mL/min.

0.20454 mg/min ÷ 600 mg × 1000 mL = 0.341 mL/min

Result at each step = 0.341 mL/min

Step 5: Convert the infusion rate to mL/hour.

0.341 mL/min × 60 min/hour = 20.46 mL/hour

Result at each step = 20.46 mL/hour

So, the infusion rate is 20.46 mL/hour.

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What measurement is the normal range for cardiac output in adults?

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Naxlex Comprehensive Predictor Exams

The physician orders a Lidocaine drip to infuse at 5 mcg/min. The drug is available as 750 mg in 500 mL of fluid. The client weighs 220 pounds. Calculate mcg/min, mcg/hr, and mL/hr.

Correct Answer is ["0.2"]

Explanation

An infusion at 3 mcg/kg/min. The drug is available as 600 mg in 1000 mL of fluid. The client weighs 150 pounds. Calculate. Do not round, if applicable.

Correct Answer is ["20.46"]

Explanation

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