Hyperkalemic familial periodic paralysis (adynamia episodica hereditaria)

General: Recurrent paralysis o 545h75f f skeletal muscles; occurs by age 10 years; usually occurs during the day when patient is sitting in a chair without exercise; attacks last 30 minutes to 2 hours.

Ocular: Transient attacks of staring with lid elevation in younger children; sclera above cornea is visible in adults when they look down; lid lag present during attacks but repeated up-and-down movements of eyes help.

Clinical: Muscle weakness; difficulty swallowing and coughing; tremor; episodes of quadriparesis lasting 2 to 3 weeks; salt craving; intense thirst; stomach pain.

Miller NR. Walsh and Hoyts Clinical Neuro-Ophthalmology, 4th ed. Baltimore: Williams & Wilkins, 1987.