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Risk of Narcolepsy Associated With Administration of H1N1 Vaccine

The recruitment status of this study is unknown because the information has not been verified recently.
Verified July 2011 by Hopital du Sacre-Coeur de Montreal.
Recruitment status was  Recruiting
Information provided by:
Hopital du Sacre-Coeur de Montreal Identifier:
First received: July 12, 2011
Last updated: July 13, 2011
Last verified: July 2011

July 12, 2011
July 13, 2011
June 2011
December 2011   (final data collection date for primary outcome measure)
Risk of narcolepsy among vaccinated and non-vaccinated persons, adjusting for age and sex using the Mantel-Haenszel method [ Time Frame: Patients complete a 30-minute questionnaire with the sleep specialist and, if they agree to do the second portion, have a 24-hour investigation in the sleep lab. ] [ Designated as safety issue: Yes ]
Risk ratios and attributable risks will be computed by comparing narcolepsy Incidence rates in exposed and non-exposed subjects. Comparison of narcolepsy incidence rates in the period prior to vaccine administration and pseudo-vaccine administration will be used to test the comparability of exposed and non-exposed group.
Same as current
Complete list of historical versions of study NCT01394614 on Archive Site
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Risk of Narcolepsy Associated With Administration of H1N1 Vaccine
Risk of Narcolepsy Associated With Administration of Inactivated Adjuvanted (AS03) A/H1N1 Pandemic Influenza Vaccine in Quebec

The goal of the study is to assess the risk of occurrence of narcolepsy following the administration of inactivated (AS03) adjuvanted A/H1N1 pandemic influenza vaccine in the province of Quebec, Canada, using different case definitions and time intervals to disease onset, while controlling for potential confounding variables such as age, gender, season and, when possible, A/H1N1 pandemic influenza infection. Another aim is to describe the epidemiology and clinical features of narcolepsy cases with onset during the period January 1st, 2009 to December 31, 2010 in the population of Quebec.

This study aims to describe the epidemiological and clinical characteristics of cases of narcolepsy which occurred in Quebec during the period 1 January 2009 to December 31, 2010 and to assess the risk of developing narcolepsy associated with the vaccine against influenza A/H1N1. The study will last about six months. Based on the prevalence of narcolepsy, an estimated 100 people who developed symptoms of narcolepsy between January 1st, 2009 and December 31, 2010 will participate in this study at the sleep clinic of the Sacré-Coeur Hospital in Montreal.

Narcolepsy is primarily characterized by the presence of excessive daytime sleepiness (EDS) and cataplexy. EDS occurs daily and is usually the most disabling symptom of narcolepsy. Cataplexy consists of a sudden drop of muscle tone triggered by strong and sudden emotions such as laughter, anger and surprise. Cataplexy is the most specific symptom of narcolepsy but it is not present in every patient especially at disease onset. Two other auxiliary symptoms are sleep paralysis and hypnagogic hallucinations either at sleep onset or upon awakening during the night or in the morning. They are present in approximately two thirds of narcoleptic patients especially in the younger individuals during the early stage of narcolepsy. Narcolepsy is associated with an absence or low level of hypocretin1 peptide in the cerebrospinal fluid (CSF).

Narcolepsy with cataplexy can be diagnosed purely on clinical grounds but this diagnosis should whenever possible be confirmed by night-time polysomnography (PSG) followed by the daytime multiple sleep latency test (MSLT). Sleep latency on the MSLT should be inferior or equal to 8 minutes with the presence of two or more sleep onset REM periods (SOREMPs). Human leukocyte antigen (HLA) typing of patients with narcolepsy-cataplexy almost always shows the presence of HLA DQB1*0602. Finally, measuring CSF level of hypocretin-1 is specific and sensitive for the diagnosis of narcolepsy with cataplexy.

Cases of narcolepsy following administration of A/H1N1 pandemic vaccines have been reported in Sweden, Finland, France and Canada. The majority of reports have shown a temporal association with inactivated (AS03) adjuvanted A/H1N1 vaccines. These cases had some common features: severe sleepiness and presence of cataplexy, abrupt onset and rapid evolution, presence of HLA DBQ1*0602 marker, very low CSF hypocretin-1, and positive MSLT test. At the request of the European Medicines Agency (EMA), a series of investigations have been considered by GlaxoSmithKline Biologicals, including one in Quebec. In this province, following the report of four cases of narcolepsy with cataplexy potentially associated with administration of Arepanrix, our research team was contacted both by federal and provincial public health authorities to evaluate the possibility of an independent investigation.

A retrospective cohort study is proposed. The existence of a comprehensive influenza immunization registry in Quebec allows a precise identification of the cohort of exposed subjects, by age and gender. Exposed subjects will be followed from the time of vaccine administration (first dose of inactivated AS03 A/H1N1 pandemic vaccine) as recorded in the immunization registry. The size of non-exposed subjects by gender- and age-specific categories will be estimated from the number in census data (a more accurate source than provincial health insurance data) minus the number in the influenza immunization registry. Pseudo-dates of vaccine administration will be generated for non-exposed subjects based on the distribution of dates of vaccinated subjects. Non-exposed subjects will be followed from the pseudo-date of vaccine administration.

All neurologists, pulmonologists, neuro-pediatricians and child psychiatrists practicing in the province of Quebec will be contacted and asked to report confirmed or suspected cases of narcolepsy with onset during the period from January1st, 2009 to December 31, 2010. Patients will be contacted by their physicians and invited to call the sleep center to participate in a study of newly diagnosed cases of narcolepsy. They will then undergo a brief screening telephone questionnaire. At this point, if they meet the minimum criteria of narcolepsy, they will be asked if they agree to participate in the study. The study includes, at first, signing a consent form and completing a questionnaire.

The questionnaire includes questions on demographics, medical history, medications, and detailed questions about symptoms of narcolepsy. In children, the information will be based on parental responses. A physician specializing in sleep medicine will call the participant to review the questionnaire with him and will propose a series of tests at the sleep laboratory of the 'Hôpital du Sacré-Coeur de Montréal', including nocturnal polysomnography, MSLT test, blood sampling (for HLA typing) and, lumbar puncture (for hypocretin measurements). Patients will sign a second consent form on site at 'Hôpital du Sacré-Coeur de Montréal' if they agree to participate in that second portion of the study. Monitoring of subjects during the study will be done under the supervision of Dr. Jacques Montplaisir, MD, PhD.

Observational Model: Cohort
Time Perspective: Retrospective
Not Provided
Retention:   Samples With DNA

HLA typing

Non-Probability Sample

The study population includes persons more than 6 months of age residing in the province of Quebec.

Other: No intervention
No intervention
Narcoleptic subjects
Vaccinated and non-vaccinated narcoleptic subjects
Intervention: Other: No intervention
Not Provided

*   Includes publications given by the data provider as well as publications identified by Identifier (NCT Number) in Medline.
December 2011
December 2011   (final data collection date for primary outcome measure)

Inclusion Criteria:

  • Subjects with symptoms of narcolepsy with onset during the period between January 1st, 2009 and December 31, 2010.

Exclusion Criteria:

  • Subjects younger than 6 months of age
6 Months and older
Contact: Jacques Montplaisir, MD, PhD 514-338-2693
Contact: Dominique Petit, PhD 514-338-2222 ext 3620
Jacques Montplaisir, MD, PhD, director of the Sleep Clinic, Sacre-Coeur Hospital
Hopital du Sacre-Coeur de Montreal
Principal Investigator: Jacques Montplaisir, MD, PhD Sacre-Coeur Hospital
Hopital du Sacre-Coeur de Montreal
July 2011

ICMJE     Data element required by the International Committee of Medical Journal Editors and the World Health Organization ICTRP