1
|
Ouyang H, Zhou Z, Dai X, Zhang J. Circadian rhythm of daytime sleepiness in pediatric narcolepsy: A pilot study. Brain Behav 2023; 13:e3109. [PMID: 37287413 PMCID: PMC10454348 DOI: 10.1002/brb3.3109] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/31/2022] [Revised: 05/03/2023] [Accepted: 05/15/2023] [Indexed: 06/09/2023] Open
Abstract
BACKGROUND AND OBJECTIVE Excessive daytime sleepiness (EDS) has been far back reported as the most disabling symptom in the pediatric narcoleptic patients. However, there is a lack of studies to examine the circadian rhythms of EDS in pediatric narcoleptic population. Therefore, we aim to investigate the circadian rhythm of EDS in pediatric narcolepsy patients. METHODS We identified 50 pediatric narcoleptic patients (36 males and 14 females, mean age 13.68 ± 2.75 years). Data were collected through interviews and the relevant questionnaires (children depression inventory [CDI] and the pediatric quality of life inventory [PedsQL]). RESULT The frequencies of sleep attacks during different intervals of the day differed significantly, with higher frequency in the morning (p < .001). The times of sleep attacks in the morning and in the afternoon were significantly associated with the degree of impairment on class and the severity of worry about sleepiness, with spearman correlation coefficient ranging from .289 to .496 (p < .05). The total scores of PedsQL and CDI differed significantly among morning sleepiness dominant, afternoon sleepiness dominant, and evening sleepiness dominant groups (p = .042, p = .040). The severity scores of the narcoleptic patients' sleepiness had two peaks, one of which occurred at 16:00, and the other peaks occurred at about 11:00. CONCLUSION These results suggest that changes based on the circadian rhythm of sleepiness of the pediatric narcoleptic patients should be made in the treatment strategy. In addition, regulating the secretion of melatonin could serve as a promising treatment to relieve sleepiness in the future.
Collapse
Affiliation(s)
- Hui Ouyang
- Department of Clinical NeurologyPeople's Hospital of Peking UniversityBeijingChina
| | - Zechen Zhou
- Department of Peking UniversityHealth Science CenterBeijingChina
| | - Xiaotong Dai
- Department of Peking UniversityHealth Science CenterBeijingChina
| | - Jun Zhang
- Department of Clinical NeurologyPeople's Hospital of Peking UniversityBeijingChina
| |
Collapse
|
2
|
Abad VC. Calcium, magnesium, potassium, and sodium oxybates oral solution for cataplexy or excessive daytime sleepiness associated with narcolepsy. Expert Opin Pharmacother 2023; 24:875-885. [PMID: 37060579 DOI: 10.1080/14656566.2023.2204187] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/17/2023]
Abstract
INTRODUCTION Lower-sodium oxybate (LXB) is a novel formulation that is approved by the US Food and Drug Administration (FDA) to treat cataplexy and excessive daytime sleepiness (EDS) in adult patients and children ≥ 7 years with narcolepsy. LXB contains 92 percent less sodium than sodium oxybate (SXB), which adds 550-1640 mg of sodium/day at usual doses of 3-9 grams per day. The FDA has declared LXB to be clinically superior to SXB due to greater safety by reducing the chronic sodium load. Narcolepsy patients have high comorbidities for hypertension and cardiovascular disease, conditions which can be adversely affected by high sodium intake. AREAS COVERED This drug review discusses narcolepsy, current and upcoming pharmacotherapy, and LXB chemistry, pharmacodynamics, pharmacokinetics, and metabolism. Published results from LXB's phase 1 studies, a phase 3 study, and 2 post-marketing studies are reviewed. Databases searched included Pubmed, Google Scholar, Lexi-Comp, Scopus, Science, and Ovid. EXPERT OPINION LXB is efficacious in treating daytime sleepiness and cataplexy in adults and children ≥ 7 years with narcolepsy. Using LXB instead of SXB formulations may benefit narcolepsy patients with cardiovascular comorbidities and hypertension, but long-term studies are needed to prove it.
Collapse
Affiliation(s)
- Vivien C Abad
- Division of Sleep Medicine, Department of Psychiatry and Behavioral Sciences Stanford University, California, United States of America
| |
Collapse
|
3
|
Park HR, Song P, Lee SY. National Estimates of Narcolepsy in Korea. J Clin Neurol 2023; 19:83-89. [PMID: 36606650 PMCID: PMC9833885 DOI: 10.3988/jcn.2023.19.1.83] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2022] [Revised: 07/29/2022] [Accepted: 07/29/2022] [Indexed: 01/04/2023] Open
Abstract
BACKGROUND AND PURPOSE Epidemiological data on narcolepsy are rare in South Korea. We aimed to provide an overview of the burden of narcolepsy and its temporal trend in South Korea. METHODS Patients with narcolepsy were identified by their registration in the Rare and Intractable Disease (RID) register and the Health Insurance Review and Assessment database. Individuals registered in the RID program with the code V234 were considered as having 'definite narcolepsy', while those who claimed health insurance with G47.4 as the primary diagnostic code were considered as having 'probable narcolepsy'. We estimated the annual prevalence, incidence, and medical costs of narcolepsy between 2010 and 2019. RESULTS The prevalence of definite narcolepsy was 8.4/100,000 in 2019, peaking at 32.0/100,000 in those aged 15-19 years. The prevalence was higher in males, with a relative risk of 1.72. The prevalence has increased over the past 6 years, with an average annual growth rate (AAGR) of 12.2%. The prevalence of probable narcolepsy was 10.7/100,000 in 2019. The incidence of definite narcolepsy increased up to 1.3/100,000 in 2019 with an AAGR of 7.1%. Annual medical expenditure for definite narcolepsy gradually increased up to 4.1 billion KRW in 2019, with a compound annual growth rate of 11.9%. CONCLUSIONS This study has provided the first nationwide estimates for narcolepsy in South Korea. The prevalence of diagnosed narcolepsy in South Korea was at the low end of the range of narcolepsy prevalence rates reported for other countries. However, the prevalence and incidence have been steadily increasing over the past decade.
Collapse
Affiliation(s)
- Hea Ree Park
- Department of Neurology, Inje University College of Medicine, Ilsan Paik Hospital, Goyang, Korea
| | - Pamela Song
- Department of Neurology, Inje University College of Medicine, Ilsan Paik Hospital, Goyang, Korea
| | - Seo-Young Lee
- Department of Neurology, College of Medicine, Kangwon National University, Chuncheon, Korea.,Interdisciplinary Graduate Program in Medical Bigdata Convergence, Kangwon National University, Chunchen, Korea
| | | |
Collapse
|
4
|
Klaus S, Carolan A, O'Rourke D, Kennedy B. What respiratory physicians should know about narcolepsy and other hypersomnias. Breathe (Sheff) 2022; 18:220157. [PMID: 36865656 PMCID: PMC9973529 DOI: 10.1183/20734735.0157-2022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2022] [Accepted: 09/22/2022] [Indexed: 11/16/2022] Open
Abstract
Narcolepsy and related central disorders of hypersomnolence may present to the sleep clinic with excessive daytime sleepiness. A strong clinical suspicion and awareness of the diagnostic clues, such as cataplexy, are essential to avoid unnecessary diagnostic delay. This review provides an overview of the epidemiology, pathophysiology, clinical features, diagnostic criteria and management of narcolepsy and related disorders, including idiopathic hypersomnia, Kleine-Levin syndrome (recurrent episodic hypersomnia) and secondary central disorders of hypersomnolence.
Collapse
Affiliation(s)
- Stephen Klaus
- Department of Sleep Medicine, St James's Hospital, Dublin, Ireland
| | - Aoife Carolan
- Department of Sleep Medicine, St James's Hospital, Dublin, Ireland
| | - Deirdre O'Rourke
- Department of Sleep Medicine, St James's Hospital, Dublin, Ireland
| | - Barry Kennedy
- Department of Sleep Medicine, St James's Hospital, Dublin, Ireland,Corresponding author: Barry Kennedy ()
| |
Collapse
|
5
|
Chung IH, Chin WC, Huang YS, Wang CH. Pediatric Narcolepsy-A Practical Review. CHILDREN (BASEL, SWITZERLAND) 2022; 9:974. [PMID: 35883958 PMCID: PMC9320719 DOI: 10.3390/children9070974] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/27/2022] [Revised: 06/21/2022] [Accepted: 06/24/2022] [Indexed: 11/16/2022]
Abstract
Pediatric narcolepsy is a chronic sleep-wakefulness disorder. Its symptoms frequently begin in childhood. This review article examined the literature for research reporting on the effects of treatment of pediatric narcolepsy, as well as proposed etiology and diagnostic tools. Symptoms of pediatric narcolepsy include excessive sleepiness and cataplexy. In addition, rapid-eye-movement-related phenomena such as sleep paralysis, sleep terror, and hypnagogic or hypnapompic hallucinations can also occur. These symptoms impaired children's function and negatively influenced their social interaction, studying, quality of life, and may further lead to emotional and behavioral problems. Therefore, early diagnosis and intervention are essential for children's development. Moreover, there are differences in clinical experiences between Asian and Western population. The treatment of pediatric narcolepsy should be comprehensive. In this article, we review pediatric narcolepsy and its treatment approach: medication, behavioral modification, and education/mental support. Pharmacological treatment including some promising newly-developed medication can decrease cataplexy and daytime sleepiness in children with narcolepsy. Other forms of management such as psychosocial interventions involve close cooperation between children, school, family, medical personnel, and can further assist their adjustment.
Collapse
Affiliation(s)
- I-Hang Chung
- Department of Child Psychiatry and Sleep Center, Chang Gung Memorial Hospital and College of Medicine, Taoyuan 333, Taiwan; (I.-H.C.); (W.-C.C.)
| | - Wei-Chih Chin
- Department of Child Psychiatry and Sleep Center, Chang Gung Memorial Hospital and College of Medicine, Taoyuan 333, Taiwan; (I.-H.C.); (W.-C.C.)
| | - Yu-Shu Huang
- Department of Child Psychiatry and Sleep Center, Chang Gung Memorial Hospital and College of Medicine, Taoyuan 333, Taiwan; (I.-H.C.); (W.-C.C.)
| | - Chih-Huan Wang
- Department of Psychology, Zhejiang Normal University, Jinhua 321004, China;
| |
Collapse
|
6
|
Sun L, Li K, Zhang L, Zhang Y. Associations Between Self-Reported Sleep Disturbances and Cognitive Impairment: A Population-Based Cross-Sectional Study. Nat Sci Sleep 2022; 14:207-216. [PMID: 35210888 PMCID: PMC8857964 DOI: 10.2147/nss.s347658] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/03/2021] [Accepted: 02/03/2022] [Indexed: 11/23/2022] Open
Abstract
OBJECTIVE Cognitive impairment is a rapidly growing global public health problem in China and worldwide. In the recent decades, emerging studies have explored the associations between sleep disturbances and cognitive impairment. However, the variety of the results imply us that further studies should be conducted for the associations. METHODS This is a cross-sectional study conducted between August and October 2018 in five cities in Hebei province, China. Subjects were 21,376 community residents. Cognitive impairment was screened by the Chinese version of the Mini-Mental State Examination (MMSE). Scales of Athens Insomnia Scale (AIS), Berlin Questionnaire (BQ), REM (rapid eye movement) Sleep Behavior Disorder Questionnaire (RBDQ-HK), Ullanlinna Narcolepsy Scale (CUNS), and Cambridge-Hopkins Restless Legs Syndrome Questionnaire (CH-RLSq) were used to access insomnia, sleep apnea, REM sleep behavior disorder, narcolepsy, and restless leg syndrome. RESULTS The mean ± SD (standard error) of MMSE, AIS, RBDQ-HK, and CUNS were 27.95 ± 4.79, 2.16 ± 3.39, 5.55 ± 7.75, and 3.76 ± 2.31, respectively. Among the participants, 10.6% and 1.5% of the participants were identified as having a high risk of sleep apnea and restless leg syndrome, respectively. The results of multiple linear regression showed that cognitive impairment was associated with insomnia (β = -0.037, p < 0.001) and narcolepsy (β = -0.023, p < 0.001). The association between sleep apnea (β = -0.002, p > 0.05), REM sleep behavior disorder (β = 0.006, p > 0.05), restless leg syndrome (β = -0.007, p > 0.05), and cognitive impairment were not supported. Other factors associated with cognitive impairment were gender, age, education level, married status, and region. CONCLUSION This study provides some epidemiological evidence for the association between sleep disturbances and cognitive impairment among community residents in central China. In this study, the associations between insomnia, narcolepsy, and cognitive impairment were identified, but the associations between sleep apnea, REM sleep behavior disorder, narcolepsy, restless leg syndrome, and cognitive impairment were not supported among community residents.
Collapse
Affiliation(s)
- Long Sun
- Centre for Health Management and Policy Research, School of Public Health, Cheeloo College of Medicine, Shandong University, Jinan, Shandong, People's Republic of China.,National Health Commission of China Key Laboratory for Health Economics and Policy Research (Shandong University), Jinan, Shandong, People's Republic of China
| | - Keqing Li
- Department of Sleep Medicine, Hebei Provincial Mental Health Center, Baoding, Hebei, People's Republic of China
| | - Lili Zhang
- Department of Sleep Medicine, Hebei Provincial Mental Health Center, Baoding, Hebei, People's Republic of China
| | - Yunshu Zhang
- Department of Sleep Medicine, Hebei Provincial Mental Health Center, Baoding, Hebei, People's Republic of China
| |
Collapse
|
7
|
Structures of active-state orexin receptor 2 rationalize peptide and small-molecule agonist recognition and receptor activation. Nat Commun 2021; 12:815. [PMID: 33547286 PMCID: PMC7864924 DOI: 10.1038/s41467-021-21087-6] [Citation(s) in RCA: 35] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2020] [Accepted: 01/05/2021] [Indexed: 02/07/2023] Open
Abstract
Narcolepsy type 1 (NT1) is a chronic neurological disorder that impairs the brain’s ability to control sleep-wake cycles. Current therapies are limited to the management of symptoms with modest effectiveness and substantial adverse effects. Agonists of the orexin receptor 2 (OX2R) have shown promise as novel therapeutics that directly target the pathophysiology of the disease. However, identification of drug-like OX2R agonists has proven difficult. Here we report cryo-electron microscopy structures of active-state OX2R bound to an endogenous peptide agonist and a small-molecule agonist. The extended carboxy-terminal segment of the peptide reaches into the core of OX2R to stabilize an active conformation, while the small-molecule agonist binds deep inside the orthosteric pocket, making similar key interactions. Comparison with antagonist-bound OX2R suggests a molecular mechanism that rationalizes both receptor activation and inhibition. Our results enable structure-based discovery of therapeutic orexin agonists for the treatment of NT1 and other hypersomnia disorders. Agonists of the orexin receptor 2 (OX2R) show promise in the treatment of narcolepsy. Cryo-EM structures of active-state OX2R bound to an endogenous peptide agonist and a small-molecule agonist suggest a molecular mechanism that rationalizes both receptor activation and inhibition.
Collapse
|
8
|
LC-MS/MS method for the quantification of SUVN-G3031, a novel H3 receptor inverse agonist for narcolepsy treatment. Bioanalysis 2020; 12:533-544. [PMID: 32351118 DOI: 10.4155/bio-2020-0020] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Background: A LC-MS/MS method was validated for the quantification of SUVN-G3031, a novel H3 receptor inverse agonist in clinical development for the treatment of patients with narcolepsy, with and without cataplexy. Methodology: SUVN-G3031 was extracted from plasma following acetonitrile protein precipitation, separated by Ultra HPLC and quantified using positive ESI-MS/MS. Results: The method was linear across the range of 0.1-100 ng ml-1 in plasma. Results for intra and inter-day accuracy were from 99.8 to 104% and precision (%CV) was ≤10.6%. Conclusion: The method was applied to a first-in-human study in healthy volunteers. The method is precise, accurate and highly selective for the quantification of SUVN-G3031 in human plasma.
Collapse
|
9
|
Scheer D, Schwartz SW, Parr M, Zgibor J, Sanchez-Anguiano A, Rajaram L. Prevalence and incidence of narcolepsy in a US health care claims database, 2008-2010. Sleep 2020; 42:5475508. [PMID: 31004158 DOI: 10.1093/sleep/zsz091] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2018] [Revised: 03/12/2019] [Indexed: 01/03/2023] Open
Abstract
STUDY OBJECTIVES To determine the prevalence and incidence of narcolepsy using a large US health care claims database. METHODS The Truven Health MarketScan Commercial Dissertation Database (THMCDD) was used to estimate prevalence and incidence of narcolepsy, with and without cataplexy, by age groups, gender, and region among patients under age 66 years with continuous enrollment for years 2008-2010. THMCDD contains health claims information for more than 18 million people. Prevalence was expressed as cases/100 000 persons. Average annual incidence (using varying criteria for latency between the diagnostic tests, polysomnograph coupled with multiple sleep latency test [MSLT], and the diagnosis) was expressed as new cases/100 000 persons/year. RESULTS There were 8 444 517 continuously enrolled patients and 6703 diagnosed with narcolepsy (prevalence overall: 79.4/100 000; without cataplexy: 65.4/100 000; with cataplexy: 14.0/100 000). On the basis of the three definitions of incidence, overall average annual incidence was 7.67, 7.13, and 4.87/100 000 persons/year. Incidence for narcolepsy without cataplexy was generally several times higher than narcolepsy with cataplexy. Prevalence and incidence were approximately 50% greater for females compared to males across most age groups. Prevalence was highest among the 21-30 years age group, with incidence highest among enrollees in their early 20s and late teens. Regionally, the North Central United States had the highest prevalence and incidence, whereas the West was the lowest. CONCLUSION We found greater prevalence and incidence of narcolepsy (including without cataplexy) than most previous studies. The increased proportions in females, enrollees in their early 20s, and US regional differences require further study. Increased awareness and early identification is critical in the management of this burdensome condition.
Collapse
Affiliation(s)
- Darren Scheer
- Department of Epidemiology and Biostatistics, College of Public Health, University of South Florida, Tampa, FL.,Department of Epidemiology and Pharmacovigilance, Biotech Research Group Corp., Tampa, FL.,Pharmaceutical Development Group Inc., Tampa, FL.,Pharmacovigilance and Epidemiology, Spotline Inc., San Jose, CA
| | - Skai W Schwartz
- Department of Epidemiology and Biostatistics, College of Public Health, University of South Florida, Tampa, FL
| | - Maria Parr
- EviCore Healthcare, Department of Sleep Medicine, Franklin, TN
| | - Janice Zgibor
- Department of Epidemiology and Biostatistics, College of Public Health, University of South Florida, Tampa, FL
| | - Aurora Sanchez-Anguiano
- Department of Epidemiology and Biostatistics, College of Public Health, University of South Florida, Tampa, FL
| | - Lakshminarayan Rajaram
- Department of Epidemiology and Biostatistics, College of Public Health, University of South Florida, Tampa, FL
| |
Collapse
|
10
|
Abad VC. An evaluation of sodium oxybate as a treatment option for narcolepsy. Expert Opin Pharmacother 2019; 20:1189-1199. [DOI: 10.1080/14656566.2019.1617273] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Vivien C. Abad
- Adjunct Clinical Associate Professor, Division of Sleep Medicine, Department of Psychiatry & Behavioral Sciences, Stanford University, Redwood City, CA, USA
| |
Collapse
|
11
|
Abstract
Narcolepsy is the most common neurological cause of chronic sleepiness. The discovery about 20 years ago that narcolepsy is caused by selective loss of the neurons producing orexins (also known as hypocretins) sparked great advances in the field. Here, we review the current understanding of how orexin neurons regulate sleep-wake behaviour and the consequences of the loss of orexin neurons. We also summarize the developing evidence that narcolepsy is an autoimmune disorder that may be caused by a T cell-mediated attack on the orexin neurons and explain how these new perspectives can inform better therapeutic approaches.
Collapse
Affiliation(s)
- Carrie E Mahoney
- Department of Neurology, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA, USA
| | - Andrew Cogswell
- Department of Neurological Sciences, Rush University Medical Center, Chicago, IL, USA
| | - Igor J Koralnik
- Department of Neurological Sciences, Rush University Medical Center, Chicago, IL, USA
| | - Thomas E Scammell
- Department of Neurology, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA, USA.
| |
Collapse
|
12
|
Vignatelli L, Antelmi E, Ceretelli I, Bellini M, Carta C, Cortelli P, Ferini-Strambi L, Ferri R, Guerrini R, Ingravallo F, Marchiani V, Mari F, Pieroni G, Pizza F, Verga MC, Verrillo E, Taruscio D, Plazzi G. Red Flags for early referral of people with symptoms suggestive of narcolepsy: a report from a national multidisciplinary panel. Neurol Sci 2018; 40:447-456. [PMID: 30539345 PMCID: PMC6433801 DOI: 10.1007/s10072-018-3666-x] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2018] [Accepted: 11/28/2018] [Indexed: 12/22/2022]
Abstract
OBJECTIVE Narcolepsy is a lifelong disease, manifesting with excessive daytime sleepiness and cataplexy, arising between childhood and young adulthood. The diagnosis is typically made after a long delay that burdens the disease severity. The aim of the project, promoted by the "Associazione Italiana Narcolettici e Ipersonni" is to develop Red Flags to detect symptoms for early referral, targeting non-sleep medicine specialists, general practitioners, and pediatricians. MATERIALS AND METHODS A multidisciplinary panel, including patients, public institutions, and representatives of national scientific societies of specialties possibly involved in the diagnostic process of suspected narcolepsy, was convened. The project was accomplished in three phases. Phase 1: Sleep experts shaped clinical pictures of narcolepsy in pediatric and adult patients. On the basis of these pictures, Red Flags were drafted. Phase 2: Representatives of the scientific societies and patients filled in a form to identify barriers to the diagnosis of narcolepsy. Phase 3: The panel produced suggestions for the implementation of Red Flags. RESULTS Red Flags were produced representing three clinical pictures of narcolepsy in pediatric patients ((1) usual sleep symptoms, (2) unusual sleep symptoms, (3) endocrinological signs) and two in adult patients ((1) usual sleep symptoms, (2) unusual sleep symptoms). Inadequate knowledge of symptoms at onset by medical doctors turned out to be the main reported barrier to diagnosis. CONCLUSIONS This report will hopefully enhance knowledge and awareness of narcolepsy among non-specialists in sleep medicine in order to reduce the diagnostic delay that burdens patients in Italy. Similar initiatives could be promoted across Europe.
Collapse
Affiliation(s)
- L Vignatelli
- IRCCS Istituto delle Scienze Neurologiche di Bologna, Bologna, Italy
| | - E Antelmi
- IRCCS Istituto delle Scienze Neurologiche di Bologna, Bologna, Italy
- Department of Biomedical and Neuromotor Sciences, University of Bologna, via Ugo Foscolo n 7, 40123, Bologna, Italy
| | - I Ceretelli
- Associazione Italiana Narcolettici e Ipersonni (AIN), Florence, Italy
| | - M Bellini
- Azienda USL Toscana centro Sedi di Prato, Prato, Italy
| | - C Carta
- National Centre for Rare Diseases, Istituto Superiore di Sanità, Rome, Italy
| | - P Cortelli
- IRCCS Istituto delle Scienze Neurologiche di Bologna, Bologna, Italy
- Department of Biomedical and Neuromotor Sciences, University of Bologna, via Ugo Foscolo n 7, 40123, Bologna, Italy
| | - L Ferini-Strambi
- Department of Clinical Neurosciences, Neurology - Sleep Disorders Center, IRCCS San Raffaele Scientific Institute, Milan, Italy
| | - R Ferri
- Sleep Research Centre, Department of Neurology I.C., Oasi Research Institute - IRCCS, Troina, Italy
| | - R Guerrini
- Pediatric Neurology, Neurogenetics and Neurobiology Unit and Laboratories, Children's Hospital A. Meyer-University of Florence, Florence, Italy
| | - F Ingravallo
- Department of Medical and Surgical Sciences (DIMEC), University of Bologna, Bologna, Italy
| | - V Marchiani
- Child Neuropsychiatric Unit, Polyclinic S. Orsola-Malpighi, University of Bologna, Bologna, Italy
| | - F Mari
- Pediatric Neurology, Neurogenetics and Neurobiology Unit and Laboratories, Children's Hospital A. Meyer-University of Florence, Florence, Italy
| | - G Pieroni
- IRCCS Istituto delle Scienze Neurologiche di Bologna, Bologna, Italy
| | - F Pizza
- IRCCS Istituto delle Scienze Neurologiche di Bologna, Bologna, Italy
- Department of Biomedical and Neuromotor Sciences, University of Bologna, via Ugo Foscolo n 7, 40123, Bologna, Italy
| | - M C Verga
- Primary Care Pediatrics, ASL Salerno, Vietri sul Mare, SA, Italy
| | - E Verrillo
- Sleep and Long Term Ventilation Unit, Pediatric Pulmonology & Respiratory Intermediate Care Unit, Academic Department of Pediatrics (DPUO) Bambino Gesù Children's Hospital, IRCCS, Rome, Italy
| | - D Taruscio
- National Centre for Rare Diseases, Istituto Superiore di Sanità, Rome, Italy
| | - Giuseppe Plazzi
- IRCCS Istituto delle Scienze Neurologiche di Bologna, Bologna, Italy.
- Department of Biomedical and Neuromotor Sciences, University of Bologna, via Ugo Foscolo n 7, 40123, Bologna, Italy.
| |
Collapse
|
13
|
Dye TJ, Gurbani N, Simakajornboon N. Epidemiology and Pathophysiology of Childhood Narcolepsy. Paediatr Respir Rev 2018; 25:14-18. [PMID: 28108192 DOI: 10.1016/j.prrv.2016.12.005] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/06/2016] [Accepted: 12/14/2016] [Indexed: 12/22/2022]
Abstract
It is now recognized that there are two types of narcolepsy. Narcolepsy type I or Narcolepsy with cataplexy is caused by the loss of hypocretin or orexin neurons. Narcolepsy type II or narcolepsy without cataplexy has normal hypocretin and the etiology is unknown. Hypocretin is a neuropeptide produced by neurons in the lateral hypothalamus. Both genetic and environmental factors play a crucial role in the pathogenesis of narcolepsy. Most patients with narcolepsy type I and half of patients with narcolepsy type II carry HLA-DQB1*0602. HLA-DQB1*0602 forms a heterodimer with HLA-DQA1*0102 and may act as an antigen presenter to the T cell receptors, resulting in narcolepsy susceptibility. In addition, narcolepsy has been shown to be linked to polymorphisms in other non-HLA genes that may affect immune regulatory function, leading to speculation that autoimmune processes may play a crucial role in the loss of hypocretin neurons. Infections have been proposed as a potential trigger for the autoimmune-mediated mechanism. Several recent studies have shown increased cases of narcolepsy, especially in children and adolescents in relation with H1N1 influenza. The increased cases in Europe seems to be related to a specific type of H1N1 influenza vaccination (Pandemrix), while the increased cases in China are related to influenza infection. The data from the Pediatric Working Group of the Sleep Research Network have shown similar increases of early onset narcolepsy in the United States.
Collapse
Affiliation(s)
- Thomas J Dye
- Sleep Center, Division of Pulmonary and Sleep Medicine, Cincinnati Children's Hospital Medical Center, 3333 Burnet Avenue, Cincinnati, Ohio 45219, USA
| | - Neepa Gurbani
- Sleep Center, Division of Pulmonary and Sleep Medicine, Cincinnati Children's Hospital Medical Center, 3333 Burnet Avenue, Cincinnati, Ohio 45219, USA
| | - Narong Simakajornboon
- Sleep Center, Division of Pulmonary and Sleep Medicine, Cincinnati Children's Hospital Medical Center, 3333 Burnet Avenue, Cincinnati, Ohio 45219, USA.
| |
Collapse
|
14
|
Um YH, Kim TW, Jeong JH, Seo HJ, Han JH, Kim SM, Song JH, Hong SC. A Longitudinal Follow-Up Study on Multiple Sleep Latency Test and Body Mass Index of Patients With Narcolepsy Type 1 in Korea. J Clin Sleep Med 2017; 13:1441-1444. [PMID: 29117886 DOI: 10.5664/jcsm.6844] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2017] [Accepted: 09/18/2017] [Indexed: 11/13/2022]
Abstract
STUDY OBJECTIVES Narcolepsy is a chronic disorder with numerous adverse long-term consequences including increased obesity, high mortality rates, and decreased quality of life. With emerging attention to the long-term course of the disorder and importance of accurate diagnosis, the diagnostic stability of the Multiple Sleep Latency Test (MSLT)-the mostly frequently used test to identify narcolepsy-is often challenged. METHODS In this study, we compared the baseline and follow-up demographic characteristics and body mass index (BMI) of patients with narcolepsy type 1. Moreover, MSLT results from repeated tests conducted on 48 patients with narcolepsy type 1 were compared, with mean follow-up of approximately 10 years. RESULTS BMI from the baseline to the follow-up visit was significantly increased in the participants. There were no significantly different parameter changes in MSLT results. CONCLUSIONS MSLT has good test-retest validity in patients with narcolepsy type 1. Close surveillance for the detection and management of obesity is warranted in clinical settings.
Collapse
Affiliation(s)
- Yoo Hyun Um
- Department of Psychiatry, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea.,Sleep Disorders Clinic, Department of Psychiatry, St. Vincent's Hospital, College of Medicine, The Catholic University of Korea, Suwon, Republic of Korea
| | - Tae-Won Kim
- Department of Psychiatry, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea.,Sleep Disorders Clinic, Department of Psychiatry, St. Vincent's Hospital, College of Medicine, The Catholic University of Korea, Suwon, Republic of Korea
| | - Jong-Hyun Jeong
- Department of Psychiatry, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Ho-Jun Seo
- Department of Psychiatry, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Jin-Hee Han
- Department of Psychiatry, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Sung-Min Kim
- Department of Psychiatry, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea.,Sleep Disorders Clinic, Department of Psychiatry, St. Vincent's Hospital, College of Medicine, The Catholic University of Korea, Suwon, Republic of Korea
| | - Ji Hyun Song
- Sleep Disorders Clinic, Department of Psychiatry, St. Vincent's Hospital, College of Medicine, The Catholic University of Korea, Suwon, Republic of Korea
| | - Seung-Chul Hong
- Department of Psychiatry, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea.,Sleep Disorders Clinic, Department of Psychiatry, St. Vincent's Hospital, College of Medicine, The Catholic University of Korea, Suwon, Republic of Korea
| |
Collapse
|
15
|
Tió E, Gaig C, Giner-Soriano M, Romero O, Jurado MJ, Sansa G, Pujol M, Sans O, Álvarez-Guerrico I, Caballol N, Jimenez M, Becerra JL, Escartin A, Monasterio C, Molins A, Bove A, Viña J, Iranzo A, Cambrodi R, Calvo G, Morros R, Santamaria J. The prevalence of narcolepsy in Catalunya (Spain). J Sleep Res 2017; 27:e12640. [DOI: 10.1111/jsr.12640] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2017] [Revised: 10/02/2017] [Accepted: 10/18/2017] [Indexed: 12/24/2022]
Affiliation(s)
- Ester Tió
- Neurology Department; Althaia; Xarxa Assistencial Universitària; Manresa Spain
| | - Carles Gaig
- Multidisciplinary Sleep Unit; Neurology Department; Hospital Clínic Barcelona; Barcelona Spain
- Centro de Investigación Biomédica en Red de Enfermedades Neurodegenerativas (CIBERNED); Madrid Spain
| | - Maria Giner-Soriano
- Institut Universitari d'Investigació en Atenció Primaria (IDIAP) Jordi Gol; Institut Català de la Salut; Universitat Autònoma de Barcelona; Barcelona Spain
| | - Odile Romero
- Multidiscilplinary Sleep Unit; Neurophisiology Department; Hospital Vall d'Hebrón; Barcelona Spain
| | - Maria-José Jurado
- Multidiscilplinary Sleep Unit; Neurophisiology Department; Hospital Vall d'Hebrón; Barcelona Spain
| | - Gemma Sansa
- Multidisciplinary Sleep Unit; Neurology Department; Hospital Parc Taulí; Sabadell Spain
| | - Montse Pujol
- Multidisciplinary Sleep Unit; Neurology Department; Hospital Universitari Santa Maria Lleida; Lleida Spain
| | - Oscar Sans
- Multidisciplinary Sleep Unit; Pediatrics Department; Hospital Sant Joan de Déu; Barcelona Spain
| | - Ion Álvarez-Guerrico
- Multidisciplinary Sleep Unit; Neurophisiology Department; Hospital del Mar; Barcelona Spain
| | - Nuria Caballol
- Neurology Department; Hospital Moisès Broggi; Sant Joan Despí Spain
| | - Marta Jimenez
- Neurology Department; Hospital Germans Trías i Pujol; Badalona Spain
| | - Juan-Luis Becerra
- Neurology Department; Hospital Germans Trías i Pujol; Badalona Spain
| | - Antonio Escartin
- Neurology Department; Hospital de la Santa Creu i Sant Pau; Barcelona Spain
| | - Carmen Monasterio
- Multidisciplinary Sleep Unit; Respiratory Department; Hospital Universitari de Bellvitge; Catalunya Spain
| | - Albert Molins
- Neurology Department; Hospital Universitari Josep Trueta; Girona Spain
| | - Antoni Bove
- Sleep Unit; Hospital de Sant Pau i Santa Tecla; Tarragona Spain
| | - Jaume Viña
- Neurology Department; Hospital Joan XXIII; Tarragona Spain
| | - Alex Iranzo
- Multidisciplinary Sleep Unit; Neurology Department; Hospital Clínic Barcelona; Barcelona Spain
- Centro de Investigación Biomédica en Red de Enfermedades Neurodegenerativas (CIBERNED); Madrid Spain
| | - Roser Cambrodi
- Multidiscilplinary Sleep Unit; Neurophisiology Department; Hospital Vall d'Hebrón; Barcelona Spain
| | - Gonzalo Calvo
- Department of Clinical Pharmacology; Hospital Clínic Barcelona; Barcelona Spain
| | - Rosa Morros
- Institut Universitari d'Investigació en Atenció Primaria (IDIAP) Jordi Gol; Institut Català de la Salut; Universitat Autònoma de Barcelona; Barcelona Spain
| | - Joan Santamaria
- Multidisciplinary Sleep Unit; Neurology Department; Hospital Clínic Barcelona; Barcelona Spain
- Centro de Investigación Biomédica en Red de Enfermedades Neurodegenerativas (CIBERNED); Madrid Spain
| |
Collapse
|
16
|
Abstract
PURPOSE OF REVIEW Summarize the recent findings in narcolepsy focusing on the environmental and genetic risk factors in disease development. RECENT FINDINGS Both genetic and epidemiological evidence point towards an autoimmune mechanism in the destruction of orexin/hypocretin neurons. Recent studies suggest both humoral and cellular immune responses in the disease development. SUMMARY Narcolepsy is a severe sleep disorder, in which neurons producing orexin/hypocretin in the hypothalamus are destroyed. The core symptoms of narcolepsy are debilitating, extreme sleepiness, cataplexy, and abnormalities in the structure of sleep. Both genetic and epidemiological evidence point towards an autoimmune mechanism in the destruction of orexin/hypocretin neurons. Importantly, the highest environmental risk is seen with influenza-A infection and immunization. However, how the cells are destroyed is currently unknown. In this review we summarize the disease symptoms, and focus on the immunological findings in narcolepsy. We also discuss the environmental and genetic risk factors as well as propose a model for disease development.
Collapse
Affiliation(s)
- Melodie Bonvalet
- Stanford University School of Medicine, Department of Psychiatry and Behavioral Sciences, Center for Sleep Sciences, Palo Alto, CA 94304, USA
| | - Hanna M. Ollila
- Stanford University School of Medicine, Department of Psychiatry and Behavioral Sciences, Center for Sleep Sciences, Palo Alto, CA 94304, USA
- National Institute for Health and Welfare, Public Genomics Unit, Helsinki, Finland
- Institute for Molecular Medicine FIMM, University of Helsinki, Helsinki, Finland
| | - Aditya Ambati
- Stanford University School of Medicine, Department of Psychiatry and Behavioral Sciences, Center for Sleep Sciences, Palo Alto, CA 94304, USA
| | - Emmanuel Mignot
- Stanford University School of Medicine, Department of Psychiatry and Behavioral Sciences, Center for Sleep Sciences, Palo Alto, CA 94304, USA
| |
Collapse
|
17
|
Lee MJ, Lee SY, Yuan SS, Yang CJ, Yang KC, Lee TL, Sun CC, Shyu YC, Wang LJ. Comorbidity of narcolepsy and depressive disorders: a nationwide population-based study in Taiwan. Sleep Med 2017; 39:95-100. [PMID: 29157595 DOI: 10.1016/j.sleep.2017.07.022] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/08/2017] [Revised: 06/19/2017] [Accepted: 07/12/2017] [Indexed: 12/19/2022]
Abstract
OBJECTIVE Narcolepsy is a chronic sleep disorder that is likely to have neuropsychiatric comorbidities. Depression is a serious mood disorder that affects individuals' daily activities and functions. The current study aimed to investigate the relationship between narcolepsy and depressive disorders. METHODS The study consisted of patients diagnosed with narcolepsy between January 2002, and December 2011 (n = 258), and age-matched and gender-matched controls (n = 2580) from Taiwan's National Health Insurance database. Both the patients and the controls were monitored through December 31, 2011, to identify the occurrence of a depressive disorder. A multivariate logistic regression model was used to assess the narcolepsy's potential influence on the comorbidity of a depressive disorder. RESULTS During the study period, 32.7%, 24.8%, and 10.9% of the narcoleptic patients were comorbid with any depressive disorder, dysthymic disorder, and major depressive disorder, respectively. When compared to the control subjects, the patients with narcolepsy were at greater risks of having any depressive disorder (aOR 6.77; 95% CI 4.90-9.37), dysthymic disorder (aOR 6.62; 95% CI 4.61-9.57), and major depressive disorder (aOR 6.83; 95% CI 4.06-11.48). Of the narcoleptic patients that were comorbid with depression, >50% had been diagnosed with depression prior to being diagnosed with narcolepsy. CONCLUSIONS This nationwide data study revealed that narcolepsy and depression commonly co-occurred. Since some symptoms of narcolepsy overlapped with those of depressive disorders, the findings serve as a reminder that clinicians must pay attention to the comorbidity of narcolepsy and depression.
Collapse
Affiliation(s)
- Min-Jing Lee
- Department of Child and Adolescent Psychiatry, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan
| | - Sheng-Yu Lee
- Department of Psychiatry, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan; Department of Psychiatry, School of Medicine and Graduate Institute of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan; Department of Psychiatry, College of Medicine, National Yang-Ming University, Taipei, Taiwan
| | - Shin-Sheng Yuan
- Institute of Statistical Science, Academia Sinica, Taipei, Taiwan
| | - Chun-Ju Yang
- Institute of Biopharmaceutical Sciences, National Yang-Ming University, Taipei, Taiwan; Community Medicine Research Center, Keelung Chang Gung Memorial Hospital, Keelung, Taiwan
| | - Kang-Chung Yang
- Institute of Biopharmaceutical Sciences, National Yang-Ming University, Taipei, Taiwan; Community Medicine Research Center, Keelung Chang Gung Memorial Hospital, Keelung, Taiwan
| | - Tung-Liang Lee
- Department of Radiation Oncology, University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Chi-Chin Sun
- Department of Chinese Medicine, College of Medicine, Chang Gung University, Kwei-Shan, Taoyuan, Taiwan; Department of Ophthalmology, Chang Gung Memorial Hospital, Keelung, Keelung, Taiwan
| | - Yu-Chiau Shyu
- Community Medicine Research Center, Keelung Chang Gung Memorial Hospital, Keelung, Taiwan; Institute of Molecular Biology, Academia Sinica, Nankang, Taipei, Taiwan; Department of Nursing, Research Center for Food and Cosmetic Safety, Research Center for Chinese Herbal Medicine, College of Human Ecology, Chang Gung University of Science and Technology, Taiwan; Department of Nutrition and Health Sciences, Research Center for Food and Cosmetic Safety, Research Center for Chinese Herbal Medicine, College of Human Ecology, Chang Gung University of Science and Technology, Taiwan
| | - Liang-Jen Wang
- Department of Child and Adolescent Psychiatry, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan; Department of Chinese Medicine, College of Medicine, Chang Gung University, Kwei-Shan, Taoyuan, Taiwan.
| |
Collapse
|
18
|
Gauci S, Hosking W, Bruck D. Narcolepsy, cataplexy, hypocretin and co-existing other health complaints: A review. COGENT MEDICINE 2017. [DOI: 10.1080/2331205x.2017.1312791] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
Affiliation(s)
- Samantha Gauci
- Psychology Discipline, College of Arts, College of Health and Biomedicine, Victoria University, P.O. Box 14428, Melbourne 8001, Australia
| | - Warwick Hosking
- Psychology Discipline, College of Arts, College of Health and Biomedicine, Victoria University, P.O. Box 14428, Melbourne 8001, Australia
| | - Dorothy Bruck
- Psychology Discipline, College of Arts, College of Health and Biomedicine, Victoria University, P.O. Box 14428, Melbourne 8001, Australia
| |
Collapse
|
19
|
Abstract
Narcolepsy is a chronic sleep disorder that has a typical onset in adolescence and is characterized by excessive daytime sleepiness, which can have severe consequences for the patient. Problems faced by patients with narcolepsy include social stigma associated with this disease, difficulties in obtaining an education and keeping a job, a reduced quality of life and socioeconomic consequences. Two subtypes of narcolepsy have been described (narcolepsy type 1 and narcolepsy type 2), both of which have similar clinical profiles, except for the presence of cataplexy, which occurs only in patients with narcolepsy type 1. The pathogenesis of narcolepsy type 1 is hypothesized to be the autoimmune destruction of the hypocretin-producing neurons in the hypothalamus; this hypothesis is supported by immune-related genetic and environmental factors associated with the disease. However, direct evidence in support of the autoimmune hypothesis is currently unavailable. Diagnosis of narcolepsy encompasses clinical, electrophysiological and biological evaluations, but simpler and faster procedures are needed. Several medications are available for the symptomatic treatment of narcolepsy, all of which have quite good efficacy and safety profiles. However, to date, no treatment hinders or slows disease development. Improved diagnostic tools and increased understanding of the pathogenesis of narcolepsy type 1 are needed and might lead to therapeutic or even preventative interventions.
Collapse
Affiliation(s)
- Birgitte R Kornum
- Molecular Sleep Laboratory, Department of Clinical Biochemistry, Rigshospitalet, Forskerparken, Nordre Ringvej 69, 2600 Glostrup, Denmark.,Danish Center for Sleep Medicine, Department of Clinical Neurophysiology, Rigshospitalet, Glostrup, Denmark
| | - Stine Knudsen
- Norwegian Centre of Expertise for Neurodevelopmental Disorders and Hypersomnias, Oslo University Hospital, Oslo, Norway
| | - Hanna M Ollila
- Department of Psychiatry and Behavioral Sciences, Center for Sleep Sciences, Stanford University, Stanford, California, USA
| | - Fabio Pizza
- Department of Biomedical and Neuromotor Sciences, University of Bologna, Bologna, Italy.,IRCCS Istituto delle Scienze Neurologiche di Bologna, Ospedale Bellaria, AUSL di Bologna, Bologna, Italy
| | - Poul J Jennum
- Danish Center for Sleep Medicine, Department of Clinical Neurophysiology, Rigshospitalet, Glostrup, Denmark
| | - Yves Dauvilliers
- Sleep Unit, Narcolepsy Reference Center, Department of Neurology, Gui de Chauliac Hospital, INSERM 1061, Montpellier, France
| | - Sebastiaan Overeem
- Sleep Medicine Center Kempenhaeghe, Heeze, The Netherlands.,Department of Industrial Design, Eindhoven University of Technology, Eindhoven, The Netherlands
| |
Collapse
|
20
|
Cho JW, Kim DJ, Noh KH, Han J, Jung DS. Comparison of Health Related Quality of Life between Type I and Type II Narcolepsy Patients. ACTA ACUST UNITED AC 2016. [DOI: 10.13078/jsm.16009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
21
|
Kawai M, O'Hara R, Einen M, Lin L, Mignot E. Narcolepsy in African Americans. Sleep 2015; 38:1673-81. [PMID: 26158891 PMCID: PMC4813366 DOI: 10.5665/sleep.5140] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2014] [Accepted: 05/15/2015] [Indexed: 12/31/2022] Open
Abstract
STUDY OBJECTIVES Although narcolepsy affects 0.02-0.05% of individuals in various ethnic groups, clinical presentation in different ethnicities has never been fully characterized. Our goal was to study phenotypic expression across ethnicities in the United States. DESIGN/SETTING Cases of narcolepsy from 1992 to 2013 were identified from searches of the Stanford Center for Narcolepsy Research database. International Classification of Sleep Disorders, Third Edition diagnosis criteria for type 1 and type 2 narcolepsy were used for inclusion, but subjects were separated as with and without cataplexy for the purpose of data presentation. Information extracted included demographics, ethnicity and clinical data, HLA-DQB1*06:02, polysomnography (PSG), multiple sleep latency test (MSLT) data, and cerebrospinal fluid (CSF) hypocretin-1 level. PATIENTS 182 African-Americans, 839 Caucasians, 35 Asians, and 41 Latinos with narcolepsy. RESULTS Sex ratio, PSG, and MSLT findings did not differ across ethnicities. Epworth Sleepiness Scale (ESS) score was higher and age of onset of sleepiness earlier in African Americans compared with other ethnicities. HLA-DQB1*06:02 positivity was higher in African Americans (91.0%) versus others (76.6% in Caucasians, 80.0% in Asians, and 65.0% in Latinos). CSF hypocretin-1 level, obtained in 222 patients, was more frequently low (≤ 110 pg/ml) in African Americans (93.9%) versus Caucasians (61.5%), Asians (85.7%) and Latinos (75.0%). In subjects with low CSF hypocretin-1, African Americans (28.3%) were 4.5 fold more likely to be without cataplexy when compared with Caucasians (8.1%). CONCLUSIONS Narcolepsy in African Americans is characterized by earlier symptom onset, higher Epworth Sleepiness Scale score, higher HLA-DQB1*06:02 positivity, and low cerebrospinal fluid hypocretin-1 level in the absence of cataplexy. In African Americans, more subjects without cataplexy have type 1 narcolepsy.
Collapse
Affiliation(s)
- Makoto Kawai
- Department of Psychiatry and Behavioral Sciences, Stanford University, School of Medicine, Stanford, CA
- Sierra Pacific Mental Illness Research Education and Clinical Centers, VA Palo Alto Health Care System, Palo Alto, CA
| | - Ruth O'Hara
- Department of Psychiatry and Behavioral Sciences, Stanford University, School of Medicine, Stanford, CA
- Sierra Pacific Mental Illness Research Education and Clinical Centers, VA Palo Alto Health Care System, Palo Alto, CA
| | - Mali Einen
- Center for Sleep Sciences and Medicine, Department of Psychiatry and Behavioral Sciences, Stanford University, School of Medicine, Palo Alto, CA
| | - Ling Lin
- Center for Sleep Sciences and Medicine, Department of Psychiatry and Behavioral Sciences, Stanford University, School of Medicine, Palo Alto, CA
| | - Emmanuel Mignot
- Center for Sleep Sciences and Medicine, Department of Psychiatry and Behavioral Sciences, Stanford University, School of Medicine, Palo Alto, CA
| |
Collapse
|
22
|
Partinen M. History of Epidemiological Research in Sleep Medicine. Sleep Med 2015. [DOI: 10.1007/978-1-4939-2089-1_24] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
23
|
Partinen M, Kornum BR, Plazzi G, Jennum P, Julkunen I, Vaarala O. Narcolepsy as an autoimmune disease: the role of H1N1 infection and vaccination. Lancet Neurol 2014; 13:600-13. [PMID: 24849861 DOI: 10.1016/s1474-4422(14)70075-4] [Citation(s) in RCA: 190] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Narcolepsy is a sleep disorder characterised by loss of hypothalamic hypocretin (orexin) neurons. The prevalence of narcolepsy is about 30 per 100 000 people, and typical age at onset is 12-16 years. Narcolepsy is strongly associated with the HLA-DQB1*06:02 genotype, and has been thought of as an immune-mediated disease. Other risk genes, such as T-cell-receptor α chain and purinergic receptor subtype 2Y11, are also implicated. Interest in narcolepsy has increased since the epidemiological observations that H1N1 infection and vaccination are potential triggering factors, and an increase in the incidence of narcolepsy after the pandemic AS03 adjuvanted H1N1 vaccination in 2010 from Sweden and Finland supports the immune-mediated pathogenesis. Epidemiological observations from studies in China also suggest a role for H1N1 virus infections as a trigger for narcolepsy. Although the pathological mechanisms are unknown, an H1N1 virus-derived antigen might be the trigger.
Collapse
Affiliation(s)
- Markku Partinen
- Helsinki Sleep Clinic, Vitalmed Research Centre, Helsinki, Finland; Department of Clinical Neurosciences, University of Helsinki, Helsinki, Finland.
| | - Birgitte Rahbek Kornum
- Molecular Sleep Laboratory, Department of Diagnostics, Glostrup Hospital, Glostrup, Denmark
| | - Giuseppe Plazzi
- Department of Biomedical and Neuromotor Sciences, University of Bologna, Italy; IRCCS Istituto delle Scienze Neurologiche, Bologna, Italy
| | - Poul Jennum
- Danish Center for Sleep Medicine, Department of Clinical Neurophysiology, University of Copenhagen, Glostrup Hospital, Glostrup, Denmark
| | - Ilkka Julkunen
- Department of Virology, University of Turku, Turku, Finland; Department of Infectious Disease Surveillance and Control, National Institute for Health and Welfare, Helsinki, Finland
| | - Outi Vaarala
- Department of Vaccines and Immune Protection, National Institute for Health and Welfare, Helsinki, Finland
| |
Collapse
|
24
|
Ahmed SS, Schur PH, MacDonald NE, Steinman L. Narcolepsy, 2009 A(H1N1) pandemic influenza, and pandemic influenza vaccinations: What is known and unknown about the neurological disorder, the role for autoimmunity, and vaccine adjuvants. J Autoimmun 2014; 50:1-11. [DOI: 10.1016/j.jaut.2014.01.033] [Citation(s) in RCA: 100] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2013] [Revised: 01/13/2014] [Accepted: 01/22/2014] [Indexed: 11/17/2022]
|
25
|
Kotagal S, Nichols CD, Grigg-Damberger MM, Marcus CL, Witmans MB, Kirk VG, D'Andrea LA, Hoban TF. Non-respiratory indications for polysomnography and related procedures in children: an evidence-based review. Sleep 2012; 35:1451-66. [PMID: 23115394 DOI: 10.5665/sleep.2188] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
OBJECTIVE This evidence-based review provides a systematic and comprehensive review of the literature regarding the utility of polysomnography for the evaluation of non-respiratory sleep disorders in children including hypersomnias, parasomnias, sleep-related movement disorders, and sleep in other special populations. METHODS A task force of pediatric sleep medicine experts performed a systematic review of the literature regarding the use of polysomnography for non-respiratory sleep disorders in children. They identified and graded 76 papers as evidence. RESULTS The main results include (1) polysomnography combined with the multiple sleep latency test is useful for evaluating disorders of excessive somnolence to objectively quantify sleepiness. The results have to be interpreted with consideration of the pubertal stage and regularity of the sleep patterns of the child; (2) polysomnography is indicated in children with parasomnias or sleep related movement disorders who have a high likelihood of having obstructive sleep apnea (OSA); (3) polysomnography is not routinely indicated in children with enuresis unless there is a high likelihood of OSA; (4) polysomnography can be helpful in evaluating children with restless legs syndrome (RLS) and when periodic limb movement disorder (PLMD) is suspected. CONCLUSIONS These findings suggest that, in children with non-respiratory sleep disorders, polysomnography should be a part of a comprehensive sleep evaluation in selected circumstances to determine the nature of the events in more detail or when the suspicion of OSA is relatively high.
Collapse
|
26
|
Aurora RN, Lamm CI, Zak RS, Kristo DA, Bista SR, Rowley JA, Casey KR. Practice parameters for the non-respiratory indications for polysomnography and multiple sleep latency testing for children. Sleep 2012; 35:1467-73. [PMID: 23115395 DOI: 10.5665/sleep.2190] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Abstract
BACKGROUND Although a level 1 nocturnal polysomnogram (PSG) is often used to evaluate children with non-respiratory sleep disorders, there are no published evidence-based practice parameters focused on the pediatric age group. In this report, we present practice parameters for the indications of polysomnography and the multiple sleep latency test (MSLT) in the assessment of non-respiratory sleep disorders in children. These practice parameters were reviewed and approved by the Board of Directors of the American Academy of Sleep Medicine (AASM). METHODS A task force of content experts was appointed by the AASM to review the literature and grade the evidence according to the American Academy of Neurology grading system. RECOMMENDATIONS FOR PSG AND MSLT USE PSG is indicated for children suspected of having periodic limb movement disorder (PLMD) for diagnosing PLMD. (STANDARD)The MSLT, preceded by nocturnal PSG, is indicated in children as part of the evaluation for suspected narcolepsy. (STANDARD)Children with frequent NREM parasomnias, epilepsy, or nocturnal enuresis should be clinically screened for the presence of comorbid sleep disorders and polysomnography should be performed if there is a suspicion for sleep-disordered breathing or periodic limb movement disorder. (GUIDELINE)The MSLT, preceded by nocturnal PSG, is indicated in children suspected of having hypersomnia from causes other than narcolepsy to assess excessive sleepiness and to aid in differentiation from narcolepsy. (OPTION)The polysomnogram using an expanded EEG montage is indicated in children to confirm the diagnosis of an atypical or potentially injurious parasomnia or differentiate a parasomnia from sleep-related epilepsy (OPTION)Polysomnography is indicated in children suspected of having restless legs syndrome (RLS) who require supportive data for diagnosing RLS. (OPTION) RECOMMENDATIONS AGAINST PSG USE: Polysomnography is not routinely indicated for evaluation of children with sleep-related bruxism. (STANDARD) CONCLUSIONS: The nocturnal polysomnogram and MSLT are useful clinical tools for evaluating pediatric non-respiratory sleep disorders when integrated with the clinical evaluation.
Collapse
Affiliation(s)
- R Nisha Aurora
- Johns Hopkins University, School of Medicine, Baltimore, MD
| | | | | | | | | | | | | |
Collapse
|
27
|
Andlauer O, Moore H, Hong SC, Dauvilliers Y, Kanbayashi T, Nishino S, Han F, Silber MH, Rico T, Einen M, Kornum BR, Jennum P, Knudsen S, Nevsimalova S, Poli F, Plazzi G, Mignot E. Predictors of hypocretin (orexin) deficiency in narcolepsy without cataplexy. Sleep 2012; 35:1247-55F. [PMID: 22942503 DOI: 10.5665/sleep.2080] [Citation(s) in RCA: 140] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Abstract
STUDY OBJECTIVES To compare clinical, electrophysiologic, and biologic data in narcolepsy without cataplexy with low (≤ 110 pg/ml), intermediate (110-200 pg/ml), and normal (> 200 pg/ml) concentrations of cerebrospinal fluid (CSF) hypocretin-1. SETTING University-based sleep clinics and laboratories. PATIENTS Narcolepsy without cataplexy (n = 171) and control patients (n = 170), all with available CSF hypocretin-1. DESIGN AND INTERVENTIONS Retrospective comparison and receiver operating characteristics curve analysis. Patients were also recontacted to evaluate if they developed cataplexy by survival curve analysis. MEASUREMENTS AND RESULTS The optimal cutoff of CSF hypocretin-1 for narcolepsy without cataplexy diagnosis was 200 pg/ml rather than 110 pg/ml (sensitivity 33%, specificity 99%). Forty-one patients (24%), all HLA DQB1*06:02 positive, had low concentrations (≤ 110 pg/ml) of CSF hypocretin-1. Patients with low concentrations of hypocretin-1 only differed subjectively from other groups by a higher Epworth Sleepiness Scale score and more frequent sleep paralysis. Compared with patients with normal hypocretin-1 concentration (n = 117, 68%), those with low hypocretin-1 concentration had higher HLA DQB1*06:02 frequencies, were more frequently non-Caucasians (notably African Americans), with lower age of onset, and longer duration of illness. They also had more frequently short rapid-eye movement (REM) sleep latency (≤ 15 min) during polysomnography (64% versus 23%), and shorter sleep latencies (2.7 ± 0.3 versus 4.4 ± 0.2 min) and more sleep-onset REM periods (3.6 ± 0.1 versus 2.9 ± 0.1 min) during the Multiple Sleep Latency Test (MSLT). Patients with intermediate concentrations of CSF hypocretin-1 (n = 13, 8%) had intermediate HLA DQB1*06:02 and polysomnography results, suggesting heterogeneity. Of the 127 patients we were able to recontact, survival analysis showed that almost half (48%) with low concentration of CSF hypocretin-1 had developed typical cataplexy at 26 yr after onset, whereas only 2% had done so when CSF hypocretin-1 concentration was normal. Almost all patients (87%) still complained of daytime sleepiness independent of hypocretin status. CONCLUSION Objective (HLA typing, MSLT, and sleep studies) more than subjective (sleepiness and sleep paralysis) features predicted low concentration of CSF hypocretin-1 in patients with narcolepsy without cataplexy.
Collapse
Affiliation(s)
- Olivier Andlauer
- Center for Sleep Sciences and Medicine, and Department of Psychiatry and Behavioral Sciences, Stanford University School of Medicine, Palo Alto, CA, USA
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
28
|
Lee YJ, Cho SJ, Cho IH, Jang JH, Kim SJ. The relationship between psychotic-like experiences and sleep disturbances in adolescents. Sleep Med 2012; 13:1021-7. [DOI: 10.1016/j.sleep.2012.06.002] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/14/2012] [Revised: 05/31/2012] [Accepted: 06/01/2012] [Indexed: 11/29/2022]
|
29
|
Han F, Lin L, Li J, Dong SX, An P, Zhao L, Liu NY, Li QY, Yan H, Gao ZC, Faraco J, Strohl KP, Liu X, Miyadera H, Mignot E. HLA-DQ association and allele competition in Chinese narcolepsy. ACTA ACUST UNITED AC 2012; 80:328-35. [PMID: 22862152 DOI: 10.1111/j.1399-0039.2012.01948.x] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2012] [Revised: 07/09/2012] [Accepted: 07/16/2012] [Indexed: 12/17/2022]
Abstract
In Japanese, Koreans and Caucasians, narcolepsy/hypocretin deficiency is tightly associated with the DRB1*15:01-DQA1*01:02-DQB1*06:02 haplotype. Studies in African-Americans suggest a primary effect of DQB1*06:02, but this observation has been difficult to confirm in other populations because of high linkage disequilibrium between DRB1*15:01/3 and DQB1*06:02 in most populations. In this study, we studied human leucocyte antigen (HLA) class II in 202 Chinese narcolepsy patients (11% from South China) and found all patients to be DQB1*06:02 positive. Comparing cases with 103 unselected controls, and 110 and 79 controls selected for the presence of DQB1*06:02 and DRB1*15:01, we found that the presence of DQB1*06:02 and not DRB1*15:01 was associated with narcolepsy. In particular, Southern Chinese haplotypes such as the DRB1*15:01-DQA1*01:02-DQB1*06:01 and DRB1*15:01-DQA1*01:02-DQB1*05 were not associated with narcolepsy. As reported in Japanese, Koreans, African-Americans and Caucasians, additional protective effects of DQA1*01 (non-DQA1*01:02) and susceptibility effects of DQB1*03:01 were observed. These results illustrate the extraordinary conservation of HLA class II effects in narcolepsy across populations and show that DRB1*15:01 has no effect on narcolepsy susceptibility in the absence of DQB1*06:02. The results are also in line with a previously proposed 'HLA-DQ allelic competition model' that involves competition between non-DQA1*01:02, non-DQB1*06:02 'competent' (able to dimerize together) DQ1 alleles and the major DQα*01:02/ DQβ*06:02 narcolepsy heterodimer to reduce susceptibility.
Collapse
Affiliation(s)
- F Han
- Department of Pulmonary Medicine, Beijing University People's Hospital, Beijing, China.
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
30
|
Han F, Lin L, Warby SC, Faraco J, Li J, Dong SX, An P, Zhao L, Wang LH, Li QY, Yan H, Gao ZC, Yuan Y, Strohl KP, Mignot E. Narcolepsy onset is seasonal and increased following the 2009 H1N1 pandemic in China. Ann Neurol 2011; 70:410-7. [PMID: 21866560 DOI: 10.1002/ana.22587] [Citation(s) in RCA: 330] [Impact Index Per Article: 25.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2011] [Revised: 07/31/2011] [Accepted: 08/02/2011] [Indexed: 11/06/2022]
Abstract
OBJECTIVE Narcolepsy is caused by the loss of hypocretin/orexin neurons in the hypothalamus, which is likely the result of an autoimmune process. Recently, concern has been raised over reports of narcolepsy in northern Europe following H1N1 vaccination. METHODS The study is a retrospective analysis of narcolepsy onset in subjects diagnosed in Beijing, China (1998-2010). Self-reported month and year of onset were collected from 629 patients (86% children). Graphical presentation, autocorrelations, chi-square, and Fourier analysis were used to assess monthly variation in onset. Finally, 182 patients having developed narcolepsy after October 2009 were asked for vaccination history. RESULTS The occurrence of narcolepsy onset was seasonal, significantly influenced by month and calendar year. Onset was least frequent in November and most frequent in April, with a 6.7-fold increase from trough to peak. Studying year-to-year variation, we found a 3-fold increase in narcolepsy onset following the 2009 H1N1 winter influenza pandemic. The increase is unlikely to be explained by increased vaccination, as only 8 of 142 (5.6%) patients recalled receiving an H1N1 vaccination. Cross-correlation indicated a significant 5- to 7-month delay between the seasonal peak in influenza/cold or H1N1 infections and peak in narcolepsy onset occurrences. INTERPRETATION In China, narcolepsy onset is highly correlated with seasonal and annual patterns of upper airway infections, including H1N1 influenza. In 2010, the peak seasonal onset of narcolepsy was phase delayed by 6 months relative to winter H1N1 infections, and the correlation was independent of H1N1 vaccination in the majority of the sample.
Collapse
Affiliation(s)
- Fang Han
- Department of Pulmonary Medicine, Beijing University People's Hospital, Beijing, China.
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
31
|
Affiliation(s)
- Markku Partinen
- Helsinki Sleep Clinic, Vital Research Centre, and Department of Neurology, University of Helsinki, Finland.
| |
Collapse
|
32
|
Abstract
Patients being evaluated in child psychiatry clinics for behavior and mood disturbances frequently exhibit daytime sleepiness. Conversely, patients being evaluated for hypersomnia by sleep specialists may have depressed mood or hyperactive and aggressive behavior. The etiology of daytime sleepiness in children and adolescents is diverse and includes inadequate sleep hygiene, obstructive sleep apnea, delayed sleep phase syndrome, idiopathic hypersomnia, periodic hypersomnia, narcolepsy, and mood disorders per se. Treatment of a sleep disorder can have a favorable impact on alertness and quality of life. A high index of suspicion for sleep problems should be maintained in children and adolescents with psychiatric disorders.
Collapse
MESH Headings
- Adolescent
- Child
- Comorbidity
- Cross-Cultural Comparison
- Cross-Sectional Studies
- Depressive Disorder, Major/diagnosis
- Depressive Disorder, Major/epidemiology
- Depressive Disorder, Major/psychology
- Diagnosis, Differential
- Disorders of Excessive Somnolence/diagnosis
- Disorders of Excessive Somnolence/epidemiology
- Disorders of Excessive Somnolence/etiology
- Disorders of Excessive Somnolence/psychology
- Health Surveys
- Humans
- Idiopathic Hypersomnia/diagnosis
- Idiopathic Hypersomnia/epidemiology
- Idiopathic Hypersomnia/psychology
- Mental Disorders/diagnosis
- Mental Disorders/epidemiology
- Mental Disorders/psychology
- Narcolepsy/diagnosis
- Narcolepsy/epidemiology
- Narcolepsy/psychology
- Patient Care Team
- Referral and Consultation
- Risk Factors
- Sleep Apnea, Obstructive/diagnosis
- Sleep Apnea, Obstructive/epidemiology
- Sleep Apnea, Obstructive/psychology
- Sleep Disorders, Circadian Rhythm/diagnosis
- Sleep Disorders, Circadian Rhythm/epidemiology
- Sleep Disorders, Circadian Rhythm/psychology
Collapse
Affiliation(s)
- Suresh Kotagal
- Department of Neurology, Division of Child Neurology, The Center for Sleep Medicine, Mayo Clinic, 200 First Street SW, Rochester, MN 55905, USA.
| |
Collapse
|
33
|
Heier MS, Evsiukova T, Wilson J, Abdelnoor M, Hublin C, Ervik S. Prevalence of narcolepsy with cataplexy in Norway. Acta Neurol Scand 2009; 120:276-80. [PMID: 19456307 DOI: 10.1111/j.1600-0404.2009.01166.x] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
OBJECTIVES Narcolepsy is a lifelong disabling disorder that may be alleviated by relevant treatment. Patients frequently report 10-15 years from the first symptoms to the time they get the diagnosis and treatment can be started. In order to offer a sufficient diagnostic and therapeutic service to this patient group, a reliable estimation of the prevalence of the disorder is important. A study of the prevalence of narcolepsy with cataplexy in Norway was therefore undertaken. MATERIALS AND METHODS The Ullanlinna Narcolepsy scale (UNS) was sent to 14548 randomly selected Norwegians between 20 and 60 years. Additionally, the study included telephone interviews and clinical evaluation of responders with >or=14 points on the UNS, and in those with suspected narcolepsy, polygraphic sleep recordings and human leucocyte antigen (HLA)-typing. RESULTS A total of 8992 responders answered the questionnaire (response rate 61.8%), 267 had >or=14 points on the UNS, 156 were interviewed and 15 had sleep recordings. In two HLADQB1*0602-positive patients sleep recordings were compatible with narcolepsy. CONCLUSIONS The results indicate a prevalence of 0.022% and approximately 1000 patients with narcolepsy with cataplexy in Norway.
Collapse
Affiliation(s)
- M S Heier
- Norwegian Resource Center for AD/HD, Tourettes Syndrome and Narcolepsy, Ullevål University Hospital, Oslo, Norway.
| | | | | | | | | | | |
Collapse
|
34
|
Alaez C, Lin L, Flores-A H, Vazquez M, Munguia A, Mignot E, Haro R, Baker H, Gorodezky C. Association of narcolepsy-cataplexy with HLA-DRB1 and DQB1 in Mexican patients: a relationship between HLA and gender is suggested. BMC MEDICAL GENETICS 2008; 9:79. [PMID: 18706091 PMCID: PMC2533302 DOI: 10.1186/1471-2350-9-79] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 01/03/2008] [Accepted: 08/15/2008] [Indexed: 12/20/2022]
Abstract
Background Narcolepsy-cataplexy is characterized by excessive daytime sleepiness with recurrent episodes of irresistible sleep, cataplexy, hallucinations and sleep paralysis. Its aetiology is unknown, but it is positively associated with the human leukocyte antigens (HLA) in all studied populations. The purpose of the present study was to investigate the association of HLA class II DRB1/DQB1 alleles with narcolepsy-cataplexy in Mexican Mestizo patients. Methods This is a case-control study of consecutive patients and ethnically matched controls. We included 32 patients diagnosed with typical narcolepsy-cataplexy, of the National Institute of Neurology, of the Institute of Psychiatry and at the Center of Narcolepsy at Stanford University. As healthy controls, 203 Mexican Mestizos were included. DRB1 alleles were identified using sequence based typing. A PCR-SSOP reverse dot blot was used for DQB1 typing. Allele frequency was calculated by direct counting and the significance of the differences was assessed using the Yates Chi square. Odds ratio and confidence intervals were evaluated. Results HLA-DRB1*1501 (OR = 8.2; pc < 0.0001) and DQB1*0602 (OR = 8.4; pc < 0.0001) were found positively associated with narcolepsy. When deleting DQB1*0602+ patients from the analysis, DQB1*0301 was also found increased (OR = 2.7; p = 0.035; pc = NS). DQB1*0602/DQB1*0301 genotype was present in 15.6% of the cases (OR = 11.5; p = 0.00035), conferring a high risk. DRB1*0407 (OR = 0.2; p = 0.016 pc = NS) and DQB1*0302(OR = 0.4; p = 0.017, pc = NS) were found decreased in the patients. The gender stratification analysis showed a higher risk in females carrying DRB1*1501 (OR = 15.8, pc < 0.0001) and DQB1*0602 (OR = 19.8, pc < 0.0001) than in males (OR = 5.0 for both alleles; p = 0.012, pc = NS for DRB1 & p = 0.0012, pc = 0.017 for DQB1). The susceptibility alleles found in Mexicans with narcolepsy are also present in Japanese and Caucasians; DRB1*04 linked protection has also been shown in Koreans. A stronger HLA association is suggested in females, in accordance with the sexual dimorphism claimed previously. Conclusion This knowledge may contribute to a better understanding of the disease pathogenesis in different populations. The evaluation of the risk to develop narcolepsy-cataplexy in carriers of the described alleles/genotypes may also be possible. A larger sample should be analysed in Mexican and in other Hispanic patients to confirm these results.
Collapse
Affiliation(s)
- Carmen Alaez
- Department of Immunology and Immunogenetics, InDRE, Mexico City, Mexico.
| | | | | | | | | | | | | | | | | |
Collapse
|