A nurse is assisting with caring for a client who has a new concussion following a motor-vehicle crash. The nurse should monitor the client for which of the following manifestations of increased intracranial pressure?

Choice A rationale This manifestation involves neck stiffness and is primarily associated with meningeal irritation, such as in meningitis or subarachnoid hemorrhage, rather than being a primary early indicator of increasing intracranial pressure following a concussion. It occurs due to spasms of the extensor muscles of the neck. While neurological, it lacks the specificity for rising pressure within the cranial vault compared to changes in the client's level of consciousness or responsiveness. Choice B rationale This finding refers to ecchymosis over the mastoid process and is a classic clinical sign of a basilar skull fracture. While it indicates significant head trauma, it is a physical sign of bone injury rather than a direct physiological manifestation of the progressive rise in intracranial pressure. A nurse monitors for this to identify the type of fracture, but it does not fluctuate directly with changing levels of pressure. Choice C rationale Changes in the level of consciousness, such as becoming drowsy or dull, are the most sensitive and earliest indicators of increasing intracranial pressure. As pressure rises, it compromises cerebral perfusion and compresses the reticular activating system, leading to decreased alertness and lethargy. Identifying this early allows for rapid intervention to prevent further brain herniation or permanent neurological damage. It is a critical assessment for any patient with a concussion. Choice D rationale Excessive urine output is often linked to diabetes insipidus, which can occur if there is trauma to the pituitary gland or hypothalamus. However, it is not a direct manifestation of increased intracranial pressure itself. Instead, pressure typically causes symptoms like bradycardia, widening pulse pressure, and respiratory changes, collectively known as Cushing's triad. Monitoring urine output is important for fluid balance but is not a primary screen for intracranial hypertension.