J Korean Neurol Assoc.  2000 Sep;18(5):665-668.

Electrophysiological Changes by Exercise and Cold Provocation Test in a Patient with Hyperkalemic Periodic Paralysis

• Kim GS
• Choo MK
• Oh YM
• Kim SM
• Sunwoo IN

Abstract

Hyperkalemic periodic paralysis and paramyotona congenita share common clinical manifestations, such as autosomal dominant diseases with missense mutations at a gene encoding alpha-subunit of skeletal muscle voltage sensitive sodium channel (SCN4A). Exercise and cold provocation tests are physiological phenomena of clinical characteristics of these diseases. The authors experienced a case with hyperkalemic periodic paralysis and performed these tests comparing them with a patient with hypokalemic periodic paralysis and a normal person. Significant decremental changes of CMAPs were found by both tests in the case with hyperkalemic periodic paralysis, compared with those in a case of hypokalemic periodic paralysis or normal control. In conclusion, we suggest that exercise and cold provocation tests may be useful for the differential diagnosis between hyperkalemic periodic paralysis and hypokalemic periodic paralysis.

Keyword

Paralysis; Hyperkalemic periodic; Electrodiagnosis

MeSH Terms

Diagnosis, Differential
Electrodiagnosis
Genes, vif
Humans
Hypokalemic Periodic Paralysis
Muscle, Skeletal
Mutation, Missense
Paralysis
Paralysis, Hyperkalemic Periodic*
Physiological Phenomena
Sodium Channels
Sodium Channels