Primary Hypokalemic Periodic Paralysis: Long-term Management and Complications in a Child

Area of Science:

• Neurology
• Genetics
• Molecular Biology

Background:

• Hypokalemic periodic paralysis (HPP) is a rare, inherited neuromuscular disorder.
• It is characterized by recurrent episodes of muscle weakness, often triggered by factors affecting potassium levels.
• Genetic mutations in ion channels of skeletal muscle are the primary cause.

Observation:

• A 9-year-old girl experienced recurrent episodes of flaccid quadriparesis with full recovery between episodes.
• Acute episodes were associated with significant hypokalemia and electrocardiogram abnormalities.
• Next-generation sequencing identified a pathogenic missense mutation in the *CACNA1S* gene.

Findings:

• The identified *CACNA1S* gene mutation is linked to the pathophysiology of HPP.
• The patient demonstrated a positive response to treatments including oral potassium, acetazolamide, and spironolactone.
• These findings confirm the genetic basis and therapeutic responsiveness of HPP.

Implications:

• Early diagnosis and genetic identification are crucial for managing HPP.
• Effective management strategies can significantly reduce paralysis frequency and prevent permanent muscle weakness.
• Understanding the genetic underpinnings of HPP aids in developing targeted therapeutic approaches.