a patient with diabetes insipidus is admitted to the intensive care unit after a motor vehicle accident that resulted in head trauma and damage to the

ATI RN

Fluid and Electrolytes ATI

1. A patient with diabetes insipidus is admitted to the intensive care unit after a motor vehicle accident that resulted in head trauma and damage to the pituitary gland. Diabetes insipidus can occur when there is a decreased production of which of the following?

A. ADH
B. Estrogen
C. Aldosterone
D. Renin

Correct answer: A

Rationale: The correct answer is A: ADH. Diabetes insipidus is characterized by a deficiency in antidiuretic hormone (ADH), leading to excessive urine output and thirst. In this scenario, the head trauma and damage to the pituitary gland can result in decreased production or release of ADH. Estrogen (Choice B) is not directly related to diabetes insipidus. Aldosterone (Choice C) is a hormone that regulates sodium and potassium levels, not water balance like ADH. Renin (Choice D) is an enzyme involved in the regulation of blood pressure and fluid balance but not directly related to diabetes insipidus.

2. What percentage of body water can be as high as in a newborn?

A. 80%.
B. 70%.
C. 60%.
D. 90%.

Correct answer: A

Rationale: The correct answer is A: 80%. Newborns can have a body water content as high as 80% due to their higher total body water compared to adults. Choice B (70%) is incorrect because newborns typically have a higher body water percentage. Choice C (60%) is also incorrect as it underestimates the body water content in newborns. Choice D (90%) is incorrect as it overestimates the body water percentage in newborns.

3. You are caring for a patient who is being treated on the oncology unit with a diagnosis of lung cancer with bone metastases. During your assessment, you note the patient complains of a new onset of weakness with abdominal pain. Further assessment suggests that the patient likely has a fluid volume deficit. You should recognize that this patient may be experiencing what electrolyte imbalance?

A. Hypernatremia
B. Hypomagnesemia
C. Hypophosphatemia
D. Hypercalcemia

Correct answer: D

Rationale:

4. Which of the following is not considered an extracellular fluid?

A. Cerebrospinal fluid
B. The humors of the eye
C. Lymph
D. Cerebrospinal fluid and the humors of the eye

Correct answer: D

Rationale: The correct answer is D. Cerebrospinal fluid and the humors of the eye are not considered extracellular fluids. Extracellular fluids are fluids found outside the cells, such as interstitial fluid and lymph. Cerebrospinal fluid is found within the central nervous system, while the humors of the eye (aqueous humor and vitreous humor) are located within the eyeball, making them distinct from extracellular fluids.