All are feature of hypernatremia, except -
Clinical features Patients with hypernatraemia generally have reduced cerebral function, either as a primary problem or as a consequence of the hypernatraemia itself, which results in dehydration of neurons and brain shrinkage. In the presence of an intact thirst mechanism and preserved capacity to obtain and ingest water, hypernatraemia may not progress very far. If adequate water is not obtained, dizziness, delirium, weakness and, ultimately, elevated intracranial tension,muscle twitching coma and death can result. Ref Davidson 23rd edition pg 360
Convulsion
Elevated intracranial tension
Periodic paralysis
Muscle twitching
Fluid and electrolytes