channelopathy
A group of disorders caused by dysfunction of ion channels affecting muscle membrane excitability and contraction.
Full Definition
Channelopathies are a diverse group of neuromuscular disorders resulting from genetic mutations affecting voltage-gated ion channels in muscle fiber membranes. These conditions include periodic paralysis syndromes, myotonia congenita, paramyotonia congenita, and other muscle membrane excitability disorders. Symptoms typically involve episodic weakness, muscle stiffness (myotonia), or both, often triggered by specific factors such as exercise, cold, or potassium intake. Diagnosis relies on clinical presentation, family history, genetic testing, and specialized electromyographic techniques. Treatment focuses on symptom management and trigger avoidance.
Usage
Usage note: Singular form; plural is 'channelopathies'.
In Context
- "The episodic weakness and family history suggested an underlying channelopathy." — Neurology consultation
- "Genetic testing confirmed a sodium channelopathy as the cause of the patient's paramyotonia." — Genetic counseling report