Long-term effectiveness of acetazolamide on permanent weakness in hyperkalemic periodic paralysis

• DOI: 10.1016/j.nmd.2013.02.007
• Publication Date: 2013-03-07T05:31:03Z
• Authors: Charungthai Dejth...; Chutima Papsing; Bunyong Phakdeeki...; Suphaneewan Jaovi...; Suchart Phudhicha...; Rawiphan Witoonpa...; Teeratorn Pulkes
• Keywords: Acetazolamide; Hypokalemic periodic paralysis; Muscle weakness; Periodic paralysis

Acetazolamide is commonly used as an empirical treatment for inherited periodic paralyses although some patients may develop deleterious effects. We report a 65 year-old man with hyperkalemic periodic paralysis and late-onset permanent weakness in association with the common T704M mutation in α-subunit, skeletal muscle voltage-gated sodium channel gene. He rapidly recovered from weakness after acetazolamide treatment. Magnetic resonance imaging of thighs comparing pre- and post-treatment revealed a significant increase in muscle bulk. The patient has been without any type of weakness for over 6 years. This data show the remarkable benefit of acetazolamide on permanent weakness of hyperkalemic periodic paralysis in association with the T704M mutation.