Diagnosis of<unk>  is made upon evaluation of patient symptoms and case history. Myotonia must increase with exercise or movement and usually must worsen in cold temperatures. Patients that present with permanent weakness are normally not characterized as having<unk> . Electromyography may be used to distinguish between<unk>  and myotonia<unk> ., Clinicians may also attempt to provoke episodes or myotonia and weakness/paralysis in patients in order to determine whether the patient has<unk> , hyperkalemic periodic paralysis, or one of the potassium-aggravated myotonias. Genomic sequencing of the SCN4A gene is the definitive diagnostic determinant.
Paramyotonia congenita
Myotonia congenita
Periodic paralysis
Klumpke paralysis
Quadrigia
Paroxysmal kinesigenic choreoathetosis
Ataxic cerebral palsy
Cramp fasciculation syndrome