In a patient with significant alcohol intoxication, how can this affect head-injury assessment?

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Alcohol intoxication depresses the central nervous system, which can hide weaknesses in the brain that would otherwise alert you to injury. This means signs of head injury, especially those that tend to improve or change as the intoxication wears off, can be masked or mimicked by drinking. The neuro exam becomes unreliable because the patient’s baseline mental status is already affected by alcohol, making it hard to tell what deficits are due to injury and what are due to intoxication. As sobriety returns and the effects of alcohol fade, new symptoms or worsening deficits may emerge, so repeated assessments or imaging may be needed to avoid missing injuries. While alcohol can also influence vital signs or affect cooperation, the crucial issue for head-injury assessment is the masking of reversible, injury-related signs by intoxication.