A nurse is caring for a patient with a head injury who has developed diabetes insipidus and is receiving desmopressin. The nurse understands the therapeutic outcome is a decrease in:

Specific gravity.

Level of consciousness.

Urine output.

Blood pressure.

Answer and Explanation

The Correct Answer is C

Choice A reason:

A decrease in specific gravity is not the primary therapeutic outcome of desmopressin in the treatment of diabetes insipidus. Desmopressin works by increasing water reabsorption in the kidneys, which leads to a decrease in urine output and an increase in urine concentration, reflected by an increase, not a decrease, in specific gravity.

Choice B reason:

A decrease in the level of consciousness is not an intended therapeutic outcome and would be concerning if observed. Desmopressin aims to control symptoms of diabetes insipidus, not alter the patient’s mental status.

Choice C reason:

A decrease in urine output is the primary therapeutic outcome of desmopressin in a patient with diabetes insipidus. Desmopressin mimics the action of antidiuretic hormone (ADH), leading to increased water reabsorption in the kidneys and reduced urine volume.

Choice D reason:

Desmopressin does not primarily aim to decrease blood pressure. Its main effect is on water reabsorption in the kidneys, thereby reducing urine output. While it can have some impact on blood pressure, this is not its primary therapeutic outcome.

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Correct Answer is A

Explanation

Choice A reason:

Assessing the level of consciousness is the most important nursing assessment for detecting early signs of a declining condition in a patient with a severe concussion. Changes in consciousness can indicate worsening brain injury or increased intracranial pressure, and prompt recognition is crucial for timely intervention.

Choice B reason:

A focal neurological exam is important but is more specific to identifying localized neurological deficits rather than detecting general deterioration. It is essential but secondary to monitoring the overall level of consciousness.

Choice C reason:

Body posturing can indicate severe brain injury or increased intracranial pressure, but it typically occurs later in the course of deterioration. Early changes in the level of consciousness are more sensitive indicators of a declining condition.

Choice D reason:

Vital signs are important to monitor, but changes in vital signs can occur later in the progression of a declining neurological status. Early detection of changes in the level of consciousness allows for more timely intervention.

A. Lower levels of arterial carbon dioxide facilitate brain oxygenation. B. Carbon dioxide is a waste product that must be eliminated from the body. C. Carbon dioxide is a vasodilator that can cause increased intracranial pressure. D. Lower levels of arterial carbon dioxide (PaCO2) are essential for gas exchange.

Correct Answer is C

Explanation

Choice A reason:

Lower levels of arterial carbon dioxide do not directly facilitate brain oxygenation. While maintaining appropriate CO2 levels is important for overall respiratory function, the primary reason for targeting a specific PaCO2 range in traumatic brain injury is related to intracranial pressure control.

Choice B reason:

Although carbon dioxide is indeed a waste product that must be eliminated from the body, this statement does not explain why specific PaCO2 levels are targeted in the context of traumatic brain injury. The primary concern is the impact of CO2 on intracranial pressure.

Choice C reason:

Carbon dioxide is a potent vasodilator, and elevated levels can lead to increased intracranial pressure (ICP). By maintaining PaCO2 within a range of 35-38 mmHg, the healthcare provider aims to prevent hypercapnia and the resulting vasodilation, which can exacerbate intracranial hypertension in patients with traumatic brain injury.

Choice D reason:

Lower levels of arterial carbon dioxide are not specifically essential for gas exchange. The primary concern with PaCO2 management in traumatic brain injury is controlling intracranial pressure, rather than optimizing gas exchange alone.

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A nurse is caring for a patient with a head injury who has developed diabetes insipidus and is receiving desmopressin. The nurse understands the therapeutic outcome is a decrease in:

Nursing Test Bank

Naxlex Comprehensive Predictor Exams

The nurse is assessing a teenager recently admitted with a severe concussion from playing football. Which is the most important nursing assessment to detect early signs of a declining condition?

Correct Answer is A

Explanation

Why does the healthcare provider prescribe a ventilator setting to maintain partial pressure of arterial carbon dioxide (PaCO2) between 35 and 38 mmHg for a patient with traumatic brain injury?

Correct Answer is C

Explanation

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