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?

Lower levels of arterial carbon dioxide facilitate brain oxygenation.

Carbon dioxide is a waste product that must be eliminated from the body.

Carbon dioxide is a vasodilator that can cause increased intracranial pressure.

Lower levels of arterial carbon dioxide (PaCO2) are essential for gas exchange.

Answer and Explanation

The Correct Answer is C

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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Correct Answer is D

Explanation

Choice A reason:

While preparing the gastrointestinal tract for enteral feedings is important, it is not the primary reason for administering famotidine. Famotidine is typically used to reduce gastric acid production, not to prepare the GI tract for feedings.

Choice B reason:

Increasing the motility of the gastrointestinal tract is not the primary function of famotidine. Famotidine is an H2 receptor antagonist that works by decreasing the production of stomach acid.

Choice C reason:

Keeping the gastrointestinal tract functioning normally is a broad statement and does not specifically address the reason for administering famotidine. The drug's role in preventing stress ulcers is more relevant to the patient's current condition.

Choice D reason:

Famotidine is used to prevent stress ulcers, which can occur in critically ill patients, including those on mechanical ventilation. The stress of illness and mechanical ventilation increases the risk of developing gastric ulcers, and famotidine helps reduce this risk by decreasing gastric acid secretion.

A. Flaccid paralysis and lack of sensation below the level of the injury B. Hypotension, bradycardia, and warm extremities C. Presence of hyperactive reflex activity below the level of the injury D. Severe headache, hypertension, and flushed face

Correct Answer is A

Explanation

Choice A reason:

Flaccid paralysis and lack of sensation below the level of the injury are classic signs of spinal shock. Spinal shock is characterized by a temporary loss of all reflexes, motor, and sensory activity below the level of injury, which typically occurs immediately following the injury. Recognizing these signs is crucial for the timely management of the condition.

Choice B reason:

Hypotension, bradycardia, and warm extremities are more indicative of neurogenic shock rather than spinal shock. Neurogenic shock results from the loss of sympathetic tone following a spinal cord injury, leading to cardiovascular changes. These signs do not specifically indicate spinal shock.

Choice C reason:

The presence of hyperactive reflex activity below the level of the injury is not associated with spinal shock. Spinal shock involves the loss of reflex activity rather than hyperactivity. Hyperactive reflexes might develop later as the spinal cord recovers from the initial shock phase.

Choice D reason:

Severe headache, hypertension, and flushed face are symptoms more commonly associated with autonomic dysreflexia, not spinal shock. Autonomic dysreflexia occurs in patients with spinal cord injuries at or above the T6 level and is a response to a noxious stimulus below the level of injury. These symptoms are not indicative of spinal shock.

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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?

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Naxlex Comprehensive Predictor Exams

A client is on mechanical ventilation and the client's spouse wonders why famotidine is needed since the client "only has lung problems." What response by the nurse is best?

Correct Answer is D

Explanation

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Correct Answer is A

Explanation

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