While assessing a client with suspected increased intracranial pressure (ICP), which of the following signs should alert the nurse to potential neurological deterioration?

Rationale: A. A sudden alteration in level of consciousness (LOC) is the earliest and most sensitive indicator of neurological deterioration in patients with increased ICP. Changes such as confusion, restlessness, decreased responsiveness, or difficulty arousing the patient indicate worsening cerebral function and possible progression toward brain herniation. Immediate intervention is required. B. Elevated blood pressure may occur as part of Cushing’s triad (along with bradycardia and irregular respirations), which indicates late-stage increased ICP. While significant, it is not the earliest or most sensitive sign of deterioration. C. Headache is a common early symptom of increased ICP, but a mild headache is nonspecific and does not necessarily indicate acute neurological decline. It is less reliable compared to changes in LOC. D. Nausea and vomiting, especially projectile vomiting, can be associated with increased ICP. However, these symptoms are not as sensitive or specific for neurological deterioration as a sudden change in LOC.