¿Qué es el test de latencia múltiple de sueño y cuál es su uso en pediatría? / What is the multiple sleep latency test and what is its use in pediatrics?

La prueba de latencia múltiple del sueño nos permite evaluar objetivamente las variaciones normales y patológicas en la somnolencia y el estado de alerta. Es una prueba que evalúa qué tan rápido una persona se duerme en condiciones estandarizadas que facilitan el sueño, y se repite a intervalos de 2 horas durante todo el día. Es el estándar para documentar el inicio del sueño REM (SOREMP), que es un síntoma de narcolepsia y en la somnolencia idiopática podría ser útil. Su uso está ampliamente descrito en adultos, pero la prueba no es tan común en niños. En esta revisión, se analizan los valores en adultos y niños, y su utilidad, a partir de la historia de la prueba.

The multiple sleep latency test allows us to objectively assess normal and pathological variations in sleepiness and alertness. It is a test that assesses how quickly a person falls asleep under standardized conditions that facilitate sleep and is repeated at 2-h intervals throughout the day. is the standard for documenting sleep onset REM (SOREMP), which is a symptom of Narcolepsy and idiopathic sleepiness could be useful. Its use is widely described in adults, but the test is not so common in children. In this review, we analyze the values in adults and children, and their usefulness, based on from the history of the test.

A four year experience in narcolepsy from a sleep clinic at a tertiary care centre with a short review of contemporary Indian literature

Narcolepsy is a common sleep disorder in Western countries but rarely reported from India. Here, we report a small case series of four narcolepsy patients seen over a four year period in the sleep clinic of a tertiary care hospital in north India. The diagnosis was established by clinical history and two or more sleep-onset rapid eye movements (SOREMs) on multiple sleep latency tests (MSLTs) following overnight polysomnography (PSG). The mean age of patients was 26.2±6.4 yr; one patient had associated cataplexy and another one had all four cardinal symptoms of narcolepsy. All these patients had a history of excessive daytime sleepiness (EDS). The mean body mass index was 24.2±4.7 kg/m[2]. The mean sleep latency during MSLT was 2.7±1.3 min, and the mean REM latency was 5.7±2.9 min. Narcolepsy, although rarely reported from India, should be suspected in young non-obese patients complaining of EDS and confirmed by performing MSLT following overnight PSG.

Diagnostic value of multiple sleep latency test in children with narcolepsy / 中华实用儿科临床杂志

Objective To explore the value of multiple sleep latency test (MSLT)in children with narcolepsy, and summarize the clinical features and characteristics of 30 patients. Methods Thirty narcolepsy patients who got treated in Department of Pediatric Neurology,Shengjing Hospital Affiliated to China Medical University were chosen as the experimental group and 38 healthy children were taken as the healthy control group from January 2014 to September 2016. The sleep latency and sleep onset rapid eye movement periods (SOREMPs)with polysomnography were analyzed in order to find the clinical features of narcolepsy and the follow - up for therapeutic effects was evaluated. Results The narcolepsy patients got their disease at an average age of (7. 50 ± 2. 08)years old,mostly in 6 to 9 years old,the average course of disease was (17. 15 ± 1. 81)months. Thirty narcolepsy patients got excessive daytime sleepi-ness,which also came as the first symptom to hospital,and the sleep latency was (2. 83 ± 1. 36)min,with an average (1. 33 ± 1. 09)times of SOREMPs,while the healthy control group got (10. 40 ± 4. 11)min,and there was significant difference between them(P < 0. 05). Eight patients got limb weakness or cataplexy,3 patients got sleep paralysis and 3 patients had hypnagogic hallucination. Twenty - three patients(76. 7％)got treatment,14 cases (46. 7％)of them got re-lieved in less than 3 months,5 cases (16. 7％)in 3 to 6 months,and another 4 cases (13. 3％)after 6 months,while the other 7 cases (23. 3％)did not get systemic therapy,in which symptoms did not get improved. Conclusion Excessive daytime sleepiness acts as a major clinical symptom in children with narcolepsy,while hypnagogic hallucinations and sleep paralysis are relatively infrequent. The peak incidence was in school age,and MSLT can help make an earlier diagnosis.

The clinical diagnosis and therapy process of pediatric narcolepsy and diagnostic value of video-electroencephalogram / 国际儿科学杂志

Narcolepsy is a common chronic sleep disorder attacking adolescence,characterized by a typical tetrad of excessive daytime sleepiness,cataplexy,sleep paralysis and hypnagonic/hypnopompic hallucinations,affecting both mental and psychological aspects of children.Thus,making an early diagnosis and therapy is of great importance.Clinical diagnosis mainly depends on the multiple sleep latency test across the video electroencephalogram.In this article,we mainly describe the diagnosis and treatment progress of pediatric narcolepsy and clinical value of video-electroencephalogram.

Sleep Perception in Obstructive Sleep Apnea: A Study Using Polysomnography and the Multiple Sleep Latency Test

BACKGROUND AND PURPOSE: Discrepancies between objectively measured sleep and subjective sleep perception in patients with insomnia have been reported. However, few studies have investigated sleep-state misperception in patients with obstructive sleep apnea (OSA). We designed this study to 1) delineate the factors that could affect this discrepancy and 2) infer an underlying mechanism in patients with OSA. METHODS: We recruited patients who visited our sleep clinic for the evaluation of their snoring and/or observed OSA. Participants completed a structured questionnaire and underwent overnight polysomnography. On the following day, five sessions of the multiple sleep latency test (MSLT) were applied. We divided the patients into two groups: normal sleep perception and abnormal perception. The abnormal-perception group included patients whose perceived total sleep time was less than 80% of that measured in polysomnography. RESULTS: Fifty OSA patients were enrolled from a university hospital sleep clinic. Excessive daytime sleepiness, periodic limb movement index (PLMI), and the presence of dreaming were positively associated with poor sleep perception. REM sleep near the sleep termination exerted important effects. Respiratory disturbance parameters were not related to sleep perception. There was a prolongation in the sleep latency in the first session of the MSLT and we suspected that a delayed sleep phase occurred in poor-sleep perceivers. CONCLUSIONS: As an objectively good sleep does not match the subjective good-sleep perception in OSA, physicians should keep in mind that OSA patients who perceive that they have slept well does not mean that their OSA is less severe.

Excessive Daytime Sleepiness Case Confounding with Thyrotoxicosis / 수면정신생리

Narcolepsy is a sleep disorder, which is characterized by excessive daytime sleepiness (EDS) that is typically associated with cataplexy, sleep fragmentation and other REM sleep-related phenomenon such as sleep paralysis and hypnagogic hallucination. Narcoleptic symptoms can be developed from various medical or neurological disorders. A 17-year-old male patient admitted for the evaluation of EDS which started three-month ago. He slept more than 18 hours a day with cataplexy and hypnagogic hallucination. He was obese with body mass index (BMI) of 30.4 kg/m2. After admission he was newly diagnosed to the thyrotoxicosis. T3 391.2 ng/dL (60-181), free T4 4.38 ng/dL (0.89-1.76), TSH <0.01 microIU/mL (0.35-5.5) were measured. His pulse rate ranged 70-90 beats per minute and blood pressure ranged 150/100-120/70 mmHg. Polysomnography revealed many fragmentations in sleep with many positional changes (81 times/h). Sleep onset latency was 33.5 min, sleep efficiency was 47.9%, and REM latency from sleep onset was delayed to 153.6 min. REM sleep percent was increased to 27.1%. Periodic limb movement index was 13.4/h. In the multiple sleep latency test (MSLT), average sleep latency was 0.4 min and there were noted 3 SOREMPs (Sleep Onset REM sleep period) on 5 trials. We couldn't discriminate the obvious sleep-wake pattern in the actigraph and his HLA DQB1 *0602 type was negative. His thyroid function improved following treatment with methimazole and propranolol. Vital sign maintained within normal range. Cataplexy was controlled with venlafaxine 75 mg. Subjective night sleep continuity and PLMS were improved with clonazepam 0.5 mg, but the EDS were partially improved with modafinil 200-400 mg. Thyrotoxicosis might give confounding role when we were evaluating the EDS, though sleep fragmentation was one of the major symptoms of narcolepsy, but enormous amount of it made us think of the influence of thyroid hormone. The loss of sleep-wake cycle, limited improvement of EDS to the stimulant treatment, and the cataplexy not supported by HLA DQB1 *0602 should be answered further. We still should rule out idiopathic hypersomnia and measuring CSF hypocretin level would be helpful.

Correlations between subjective and objective features of nocturnal sleep and excessive diurnal sleepiness in patients with narcolepsy / Correlação entre as características objetivas e subjetivas do sono noturno e a hipersonolência diurna em pacientes narcolepticos

OBJECTIVE: To determine the correlations between excessive daytime sleepiness (EDS), assessed by the Epworth sleepiness scale (ESS), and the multiple sleep latency test (MSLT) and nocturnal sleep architecture features, clinical symptoms of narcolepsy (CSN) and subjective sleep quality (SSQ) in patients with narcolepsy. METHOD: Twenty three untreated patients were studied and compared with a matched control group. Diagnosis of narcolepsy was carried out employing a clinical interview, a polysomnographic (PSG) record, and an MSLT. RESULTS: Subjective number of awakenings was the SSQ indicator that best correlated with EDS (ESS and MSLT). Regarding clinical features, diurnal tiredness and sleep paralysis correlated with ESS values. Increase in ESS was related with decrease in total sleep time, SWS, and sleep onset latency. On the other hand, increase in MSLT was related with decrease in SWS. CONCLUSION: These data suggest that EDS in patients with narcolepsy could be impaired by disturbed nocturnal sleep.

OBJETIVO: Determinar as correlações entre hipersonolência, avaliada pela escala de sonolência Epworth (ESE) e o teste múltiplo de latência do sono (TMLS) com a arquitetura do sono (AS), sintomas e qualidade subjetiva do sono em pacientes narcolepticos. MÉTODO: Comparou-se um grupo de vinte e tres pacientes narcolepticos sem tratamento com grupo controle. O diagnóstico de narcolepsia foi realizado por uma entrevista clinica, polissonografia e o TMLS. RESULTADOS: O número subjetivo de despertares foi o indicador com maior relação com a hipersonolência, o cansaço diurno e a paralisia do sono também foi correlacionados com a ESE.O aumento do índice na ESE foi correlacionado com uma diminuição do tempo total do sono, no sono de ondas lentas (SOL) e com a latência para o início do sono. O incremento na TMLS foi relacionado com diminuição do SOL. CONCLUSÃO: Os dados sugerem que a hipersonolência diurna em pacientes portadores de narcolepsia pode se correlacionar com as alterações da arquitetura do sono noturno.

Changes in Multiple Sleep Latency Test Results according to Different Criteria of Sleep Onset / 수면정신생리

OBJECTIVES: The multiple sleep latency test (MSLT) is commonly used as a valid objective measure of sleepiness. The procedure of MSLT is well standardized but the sleep onset criterion is somewhat variable. One epoch of stage 1 sleep is the most commonly used criterion, and the criterion of three epochs of stage 1 sleep is also used. The purpose of this study was to compare the two criteria used to determine sleep onset. METHODS: We retrospectively analyzed 60 consecutive MSLT that were performed according to a standaridized protocol. We scored each test using the two different criteria for sleep onset and then statistically analyed the results. RESULTS: Using the different criteria, 20 patients among 60 showed changes in mean sleep latency (33.3%). The extent of change ranged from 1.3% to 38.5% (mean 15.9%). Non-narcoleptic patients showed a significantly higher incidence of change than other sleep disorder patients. CONCLUSION: Changes in mean sleep latency occurred according to the different criteria of sleep onset. But the difference arising from different criteria was statistically not significant in patients with moderate to severe sleepiness. Considering that 1 epoch criterion for sleep onset is more sensitive in detecting clinically significant sleepiness, the authors suggest that the 1 epoch criterion is more reliable than the 3 epochs criterion.

A Case of Narcolepsy Diagnosed by Multiple Sleep Latency Test

Narcolepsy is a serious, lifelong, disabling disorder characterized by a tetrad of symptoms including excessive daytime sleepiness, cataplexy, hypnagogic hallucination, and sleep paralysis. We experienced a 14 year old boy with a narcolepsy diagnosed by typical clinical symptoms above mentioned and multiple sleep latency test. A brief review of the related literatures was also made.