Which symptom indicates increased intracranial pressure in a client?

The symptom that indicates increased intracranial pressure (ICP) is restlessness. Restlessness can occur as a result of heightened ICP because the brain is under stress due to the increased volume of cerebrospinal fluid or mass effect from a lesion, which can affect mental status and produce behavioral changes. As the brain's normal physiology becomes disrupted, the patient may express feelings of agitation or restlessness.

While severe headache, dizziness, and bradycardia can be associated with various neurological conditions, they are not the most direct indicators of increased ICP compared to restlessness. Headaches can result from many causes, and dizziness is often related to vestibular or other non-ICP related issues. Bradycardia can occur in response to increased ICP, but it is not typically an early symptom that indicates elevated ICP; it is more of a later manifestation in the context of severe pressure. Therefore, restlessness stands out as a key behavioral indicator highlighting the effects of increased intracranial pressure.