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Thyrotoxic periodic paralysis 

Thyrotoxic periodic paralysis
Chapter:
Thyrotoxic periodic paralysis
Author(s):

Annie W.C. Kung

DOI:
10.1093/med/9780199235292.003.3171
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date: 11 December 2019

The association of thyrotoxicosis and periodic paralysis was first described in 1902 in a white patient. However, it soon became evident that thyrotoxic periodic paralysis (TPP) affects mainly Asian populations, in particular Chinese and Japanese, although isolated cases have also been reported in other ethnic groups such as white, Hispanic, African-American, and American Indian populations. The incidence of TPP in non-Asian thyrotoxic patients is around 0.1%, whereas in Chinese and Japanese thyrotoxic patients, TPP affects 1.8% and 1.9%, respectively (1–3). Despite a higher incidence of thyrotoxicosis in women, TPP affects mainly men, with a male to female ratio ranging from 17:1 to 70:1, according to different series. In the Chinese population, TPP affects 13% of male and 0.17% of female thyrotoxic patients. In the Japanese population, TPP was reported to occur in 8.2% of male and 0.4% of female thyrotoxic patients in the 1970s, but in 1991 the reported incidence had decreased to 4.3% and 0.04%, respectively (4).

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