A patient with a severe brain stem injury one week ago has demonstrated minimal change since the incident. The patient's cognitive status is most likely to include:

A patient with a severe brain stem injury one week ago has demonstrated minimal change since the incident. The patient's cognitive status is most likely to include:

• A. Decrease level of arousal
• B. Decrease level of intelligence
• C. Increase level of agitation
• D. Increase level of impulsivity

Answer: (A)

A brainstem injury often disrupts the reticular activating system that controls wakefulness, so the first and most prominent change is a reduced level of arousal. When arousal is low, a patient may appear drowsy or comatose and have limited ability to engage with and respond to tasks, which masks higher cognitive abilities. Intelligence and higher-order thinking depend on cortical processing, and without sufficient arousal, these functions can’t be effectively assessed, making decreased arousal the most likely cognitive status one week after a severe brainstem injury. Agitation or impulsivity can occur in other recovery patterns, but they are not the hallmark of a persistent brainstem injury with minimal change in this timeframe.

A brainstem injury often disrupts the reticular activating system that controls wakefulness, so the first and most prominent change is a reduced level of arousal. When arousal is low, a patient may appear drowsy or comatose and have limited ability to engage with and respond to tasks, which masks higher cognitive abilities. Intelligence and higher-order thinking depend on cortical processing, and without sufficient arousal, these functions can’t be effectively assessed, making decreased arousal the most likely cognitive status one week after a severe brainstem injury. Agitation or impulsivity can occur in other recovery patterns, but they are not the hallmark of a persistent brainstem injury with minimal change in this timeframe.