Abstract：
OBJECTIVES:To determine the familial aggregation of narcolepsy from perspectives of clinical symptomatology, polysomnographic data, and human leukocyte antigen (HLA) typing. METHODS:This was a Family study at the University-affiliated hospital. The participants were narcolepsy probands and their first degree relatives, and, also, age and sex matched unrelated healthy controls. Interventions were not applicable. MEASUREMENTS AND RESULTS:All study subjects underwent structured interviews, overnight polysomnography followed by a multiple sleep latency test (MSLT), and HLA typing. Altogether, 33 probands and 81 first degree relatives (response rate 65%) were recruited. Among the relatives, 12.3% were diagnosed with narcolepsy and 39.5% had narcolepsy spectrum as defined by unexplained abnormal MSLT (shortened MSL and SOREMP) results. The relative risk of narcolepsy in first degree relatives was 361.8. Familial aggregation of narcolepsy symptoms, excessive daytime sleepiness, HLA status, abnormal MSLT, and nocturnal polysomnographic findings were observed. CONCLUSIONS:The familial risk of narcolepsy among first degree relatives is much higher than previously reported. There exists a spectrum of narcolepsy features among relatives, ranging from full clinical tetrads to asymptomatic abnormal MSLT findings.
journal_name
Sleep Medjournal_title
Sleep medicineauthors
Wing YK,Chen L,Lam SP,Li AM,Tang NL,Ng MH,Cheng SH,Ho CK,Mok V,Leung HW,Lau A,Chan MH,Chan HS,Chan PSdoi
10.1016/j.sleep.2011.05.007subject
Has Abstractpub_date
2011-12-01 00:00:00pages
947-51issue
10eissn
1389-9457issn
1878-5506pii
S1389-9457(11)00264-4journal_volume
12pub_type
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