Acetazolamide-responsive myotonia congenita

Area of Science:

• Neurology
• Medical Genetics

Background:

• Autosomal dominant myotonia presents with varied clinical features.
• Myotonia congenita can be autosomal dominant or recessive, with distinct muscle pathology.

Observation:

• Studied 14 patients from a kindred with a unique form of autosomal dominant myotonia.
• Patients experienced painful muscle stiffness triggered by fasting and potassium, relieved by carbohydrates.

Findings:

• Muscle biopsies revealed type 1, 2A, and 2B fibers, unlike some myotonia congenita cases lacking type 2B fibers.
• Acetazolamide demonstrated significant efficacy in relieving myotonia, outperforming other agents.

Implications:

• This research highlights a distinct subtype of autosomal dominant myotonia.
• Acetazolamide shows promise as a primary therapeutic agent for this myotonia variant.