Familial hyperkalemic periodic paralysis

Familial hyperkalemic periodic paralysis is a rare, autosomal dominant neuromuscular channelopathy that primarily affects skeletal muscle function in children and adults Clinically, the condition is defined by recurrent, transient episodes of flaccid muscle weakness or paralysis that are frequently accompanied by elevated serum potassium concentrations and subclinical or clinical myotonia

Familial hyperkalemic periodic paralysis is a rare, autosomal dominant neuromuscular channelopathy that primarily affects skeletal muscle function in children and adults It is classically caused by gain-of-function mutations in the *SCN4A* gene encoding the voltage-gated skeletal muscle sodium channel Nav1.4, which lead to impaired channel inactivation, sustained sarcolemmal depolarization, and temporary loss of muscle fiber excitability

Familial hyperkalemic periodic paralysis is a rare, autosomal dominant neuromuscular channelopathy that primarily affects skeletal muscle function in children and adults It is classically caused by gain-of-function mutations in the *SCN4A* gene encoding the voltage-gated skeletal muscle sodium channel Nav1.4, which lead to impaired channel inactivation, sustained sarcolemmal depolarization, and temporary loss of muscle fiber excitability Clinically, the condition is defined by recurrent, transie...

It is classically caused by gain-of-function mutations in the *SCN4A* gene encoding the voltage-gated skeletal muscle sodium channel Nav1.4, which lead to impaired channel inactivation, sustained sarcolemmal depolarization, and temporary loss of muscle fiber excitability

Clinically, the condition is defined by recurrent, transient episodes of flaccid muscle weakness or paralysis that are frequently accompanied by elevated serum potassium concentrations and subclinical or clinical myotonia Episodes typically involve the proximal limbs and are commonly triggered by rest following strenuous physical exertion, fasting, cold exposure, or potassium-rich dietary intake

Episodes typically involve the proximal limbs and are commonly triggered by rest following strenuous physical exertion, fasting, cold exposure, or potassium-rich dietary intake