A 40-year-old man (weight 60 kg) is admitted to the trauma ICU after a motor vehicle accident. He is noted to have a serum magnesium concentration of 1.2 mg/dL, and his family states he has a history of alcohol abuse. He is given magnesium sulfate 6 g intravenously over 4 hours by the primary service. His repeat serum magnesium concentration on the following day is 1.8 mg/dL. Which would be the most appropriate treatment for this patient?

Questions 97

ATI RN

ATI RN Test Bank

Chapter 14 Nutrition and Fluid Balance Questions

Question 1 of 5

A 40-year-old man (weight 60 kg) is admitted to the trauma ICU after a motor vehicle accident. He is noted to have a serum magnesium concentration of 1.2 mg/dL, and his family states he has a history of alcohol abuse. He is given magnesium sulfate 6 g intravenously over 4 hours by the primary service. His repeat serum magnesium concentration on the following day is 1.8 mg/dL. Which would be the most appropriate treatment for this patient?

Correct Answer: D

Rationale: Alcohol abuse often leads to chronic magnesium depletion. A serum level of 1.8 mg/dL is still low-normal, and repletion typically requires multiple days (4-5) of magnesium therapy to restore intracellular stores.

Question 2 of 5

When a body is dehydrated, water in the urinary bladder

Correct Answer: C

Rationale: Water in the bladder is urine already filtered and cannot be reabsorbed; it is expelled despite dehydration.

Question 3 of 5

The primary osmoreceptors are located in the

Correct Answer: D

Rationale: Osmoreceptors in the hypothalamus detect changes in plasma osmolarity and trigger responses like vasopressin release.

Question 4 of 5

Why is sodium actively reabsorbed in the nephron?

Correct Answer: C

Rationale: Active sodium reabsorption creates an osmotic gradient that drives passive water reabsorption.

Question 5 of 5

Which of the following is NOT true about angiotensin II?

Correct Answer: B

Rationale: Angiotensin II activates sympathetic, not parasympathetic, output to raise blood pressure.

Access More Questions!

ATI RN Basic


$89/ 30 days

ATI RN Premium


$150/ 90 days

Similar Questions