Chronic progressive myopathy in a young patient with hyperkalemic periodic paralysis

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Hyperkalemic periodic paralysis (hyperKPP) is a muscle sodium-ion channelopathy characterized by recurrent paralytic attacks. Although most affected individuals have normal muscle strength between attacks, some develop fixed or chronic progressive weakness, independently of the presence of episodic attacks. Fixed weakness in hyperKPP is known to be common in older patients with a long disease duration. Here, we present a young hyperKPP patient who developed progressive weakness. A 21-year-old man was diagnosed with hyperKPP as his father and younger sister.

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