Sleep Unit

Schwalmstadt, Germany

Sleep Unit

Schwalmstadt, Germany

Time filter

Source Type

PubMed | Sleep Unit, Autonomous University of Barcelona, Vall dHebron Research Institute and University of Akron
Type: | Journal: Journal of neurosurgery | Year: 2016

OBJECTIVE Traditionally, Chiari malformation Type I has been related to downward herniation of the cerebellar tonsils as a consequence of an underdeveloped posterior cranial fossa. Although the common symptoms of Chiari malformation Type I are occipital headaches, cervical pain, dizziness, paresthesia, and sensory loss, patients often report symptoms related to pharyngeal dysfunction such as choking, regurgitation, dysphagia, aspiration, chronic cough, and sleep disorders. In addition, tracheal intubation is often difficult in these patients. The purpose of this study was to analyze the morphological features of the oropharynx and oral cavity in patients with Chiari malformation Type I to help identify underlying anatomical anomalies leading to these debilitating symptoms. METHODS Seventy-six adult patients with symptomatic Chiari malformation Type I with cerebellar tonsillar descent greater than 5 mm below the foramen magnum and a small posterior cranial fossa and 49 sex-matched controls were selected to perform a retrospective case-control MRI-based morphometric study in a tertiary hospital. Eleven linear and areal parameters of the oropharyngeal cavity on midsagittal T1-weighted MRI were measured and the average values between patients and control cohorts were compared. Correlations between variables showing or approaching statistical significance in these structures and posterior cranial fossa measurements related with the occipital bone were sought. RESULTS Significant differences were detected for several oropharynx and oral cavity measures in the patient cohort, primarily involving the length and thickness of the soft palate (p = 9.5E-05 and p = 3.0E-03, respectively). A statistically significant (p < 0.01) moderate correlation between some of these variables and posterior cranial fossa parameters was observed. CONCLUSIONS The existence of structural oropharyngeal and oral cavity anomalies in patients with Chiari malformation Type I was confirmed, which may contribute to the frequent occurrence of respiratory and deglutitory complications and sleep disorders in this syndrome.


Kheirandish-Gozal L.,University of Chicago | Gileles-Hillel A.,University of Chicago | Alonso-Alvarez M.L.,Sleep Unit | Alonso-Alvarez M.L.,CIBER ISCIII | And 10 more authors.
International Journal of Obesity | Year: 2015

Background:Obesity and obstructive sleep apnea syndrome (OSA) are highly prevalent and frequently overlapping conditions in children that lead to systemic inflammation, the latter being implicated in the various end-organ morbidities associated with these conditions.Aim:To examine the effects of adenotonsillectomy (T and A) on plasma levels of inflammatory markers in obese children with polysomnographically diagnosed OSA who were prospectively recruited from the community.Methods:Obese children prospectively diagnosed with OSA, underwent T and A and a second overnight polysomnogram (PSG) after surgery. Plasma fasting morning samples obtained after each of the two PSGs were assayed for multiple inflammatory and metabolic markers including interleukin (IL)-6, IL-18, plasminogen activator inhibitor-1 (PAI-1), monocyte chemoattractant protein-1 (MCP-1), matrix metalloproteinase-9 (MMP-9), adiponectin, apelin C, leptin and osteocrin.Results:Out of 122 potential candidates, 100 obese children with OSA completed the study with only one-third exhibiting normalization of their PSG after T and A (that is, apnea-hypopnea index (AHI) ≤1/hour total sleep time). However, overall significant decreases in MCP-1, PAI-1, MMP-9, IL-18 and IL-6, and increases in adropin and osteocrin plasma concentrations occurred after T and A. Several of the T and A-responsive biomarkers exhibited excellent sensitivity and moderate specificity to predict residual OSA (that is, AHI≥5/hTST).Conclusions:A defined subset of systemic inflammatory and metabolic biomarkers is reversibly altered in the context of OSA among community-based obese children, further reinforcing the concept on the interactive pro-inflammatory effects of sleep disorders such as OSA and obesity contributing to downstream end-organ morbidities. © 2015 Macmillan Publishers Limited All rights reserved.


Lloberes P.,Autonomous University of Barcelona | Lloberes P.,CIBER ISCIII | Sampol G.,Autonomous University of Barcelona | Sampol G.,CIBER ISCIII | And 10 more authors.
Journal of Hypertension | Year: 2014

The high prevalence of obstructive sleep apnea in patients with resistant hypertension could be mediated by an activation of the renin-angiotensin- aldosterone system. This study assessed the impact of continuous positive airway pressure (CPAP) treatment on plasma aldosterone concentration (PAC). METHODS:: One hundred and twenty-four patients with resistant hypertension were assessed, and those who fulfilled inclusion criteria (n = 116) underwent full night polysomnography, 24-h ambulatory blood pressure monitoring, and PAC measurement. Patients with an apnea-hypopnea index above 15 (n = 102) were randomized to CPAP (n = 50) or to conventional treatment (n = 52) for 3 months. RESULTS:: Seventy-eight patients completed the follow-up (36 CPAP, 42 conventional treatment); 58 had true resistant hypertension (74.3%), whereas 20 had white-coat resistant hypertension (25.6%). Most patients were men (70.7%), age 58.3 ± 9.4 years, and the mean apnea-hypopnea index was 50.1 ± 21.6. In patients with true resistant hypertension, CPAP achieved a significant decrease in most 24-h BP measurements and a nonsignificant decrease in PAC (25 ± 8.7 vs. 22.7 ± 9 ng/dl; P < 0.182). In patients with white-coat resistant hypertension, CPAP achieved a significant decrease in PAC (26.1 ± 11.2 vs. 18.9 ± 10.1 ng/dl; P < 0.041) and in night-time DBP. After adjustment, a weak but significant association was found between cumulative time spent with SaO2 below 90% (CT90%) and baseline PAC (P < 0.047, R 0.019), and between changes in PAC and changes in office DBP (P < 0.020, R 0.083) CONCLUSIONS:: Night-time hypoxemia and changes in DBP showed an association with baseline and changes in PAC, respectively. CPAP achieved a significant reduction in PAC only in patients with white-coat resistant hypertension, although the CPAP effect on BP was highest in patients with true resistant hypertension.


PubMed | University of Lleida, Sleep Unit, Autonomous University of Barcelona and Corporacio Sanitaria Parc Tauli
Type: | Journal: Diabetic medicine : a journal of the British Diabetic Association | Year: 2016

To determine whether or not the sleep disturbances associated with Type 2 diabetes affect the structure of sleep.We designed a case-control study in 76 patients with Type 2 diabetes and 76 control subjects without Type 2 diabetes, matched by age, gender, BMI and waist and neck circumferences. A subgroup of 32 patients with Type 2 diabetes was also matched with 64 control subjects without Type 2 diabetes according to apnoea-hypopnoea index score. Examination included an overnight full polysomnography.No differences in the percentage of time spent in either rapid eye movement or non-rapid eye movement sleep were observed between groups; however, patients with Type 2 diabetes had more microarousal events during sleep than control subjects [41.4 (total range 4.0-104.4) vs 20.7 (total range 1.3-94.5) events/h; P < 0.001]. These differences were mainly observed during the non-rapid eye movement sleep [7.4 (total range 0-107.2) vs 0.2 (total range 0-65.2) events/h; P < 0.001]. In addition, sleep variables related to oxygen saturation measures, such as the percentage of time spent with oxygen saturation 90%, were significantly greater during the rapid eye movement sleep in patients with Type 2 diabetes [20.3 (total range 0-99.2) vs. 10.5 (total range 0-94.0)%; P = 0.047]. This pattern was maintained in the subgroup of patients matched by apnoea-hypopnaea index. Finally, stepwise regression analyses showed that apnoea-hypopnoea index, the presence of Type 2 diabetes and fasting plasma glucose value were independently associated with the number of microarousals (RType 2 diabetes is associated with an altered sleep structure, with different effects according to rapid eye movement (increase in nocturnal hypoxia) or non-rapid eye movement (increase in sleep fragmentation) sleep.


Guglielmi O.,Sleep Unit | Jurado-Gamez B.,University of Cordoba, Spain | Gude F.,Hospital Clinico Universitario Of Santiago | Buela-Casal G.,Sleep Unit
Sleep and Breathing | Year: 2015

Purpose: The aim of this systematic literature review was to assess the impact of obstructive sleep apnea syndrome (OSAS) on patients’ occupational health. Methods: We selected 19 studies that dealt with issues related to job performance and productivity, absenteeism, and psychosocial health of patients with OSAS and assessed the risk of bias in their conclusions. Results: Although methodologically rigorous studies are needed to confirm these findings, the results obtained suggest the existence of multiple relationships between OSAS and work limitations of patients (i.e., difficulties maintaining attention, learning new tasks, or performing monotonous tasks). The studies reviewed reached more scientifically consistent conclusions about such patients’ risk of taking more days of sick leave or having work disability, particularly if they reported excessive daytime sleepiness. Very few studies have explored the relationship between OSAS and psychosocial occupational health of patients. Thus, there is a need for research to clarify these aspects of occupational medicine. Conclusions: OSAS has numerous effects on patients’ occupational health, yet, in general, results should be confirmed by studies with sufficiently large samples in which OSAS is diagnosed with reliable methods and occupational variables are assessed with standardized and validated questionnaires. © 2014, Springer-Verlag Berlin Heidelberg.


Dauvilliers Y.,Montpellier University | Bassetti C.,University of Bern | Lammers G.J.,Leiden University | Arnulf I.,Sleep Disorder Unit | And 7 more authors.
The Lancet Neurology | Year: 2013

Background: Narcolepsy is characterised by excessive daytime sleepiness (EDS) and cataplexy. Histamine neurons are crucial to maintain wakefulness. We assessed the safety and efficacy of pitolisant (previously called BF2.649), a selective histamine H3 receptor inverse agonist that activates these neurons, in patients with narcolepsy. Methods: For this double-blind, randomised, parallel-group controlled trial, we recruited patients with narcolepsy from 32 sleep disorder centres in five European countries. Patients were eligible if they were aged 18 years or older, had not taken psychostimulants for at least 14 days, and had EDS (defined as an Epworth Sleepiness Scale [ESS] score of at least 14). Using a computer-generated randomisation sequence, we randomly allocated patients to receive pitolisant, modafinil, or placebo (1:1:1). Treatment lasted 8 weeks: 3 weeks of flexible dosing according to investigator's judgment (10 mg, 20 mg, or 40 mg a day of pitolisant; 100 mg, 200 mg or 400 mg a day of modafinil) followed by 5 weeks of stable dosing. Patients took four tablets a day in a double-dummy design to ensure masking. For the primary analysis, assessed in the intention-to-treat population, we assessed the superiority of pitolisant versus placebo, and the non-inferiority of pitolisant versus modafinil. This trial is registered with ClinicalTrials.gov, number NCT01067222. Findings: Between May 26, 2009, and June 30, 2010, we screened 110 patients, 95 of whom were eligible and randomly assigned to treatment: 30 to placebo, 32 to pitolisant, and 33 to modafinil. Over the 8-week treatment period, mean ESS score reductions were -3·4 (SD 4·2) in the placebo group, -5·8 (6·2) in the pitolisant group, and -6·9 (6·2) in the modafinil group. Our primary analysis of between-group differences in mean ESS score at endpoint (adjusted for baseline) showed pitolisant to be superior to placebo (difference -3·0, 95% CI -5·6 to -0·4; p=0·024), but not non-inferior to modafinil (difference 0·12, 95% CI -2·5 to 2·7; p=0·250). We recorded 22 adverse events with pitolisant, 26 with modafinil, and ten with placebo. Six severe adverse events were treatment-related: one with pitolisant (abdominal discomfort) and five with modafinil (abdominal pain, abnormal behaviour, amphetamine-like withdrawal symptoms, lymphoadenopathy, and inner ear disorders). Interpretation: Pitolisant at doses up to 40 mg was efficacious on EDS compared with placebo and well tolerated compared with modafinil. If these findings are substantiated in further studies, pitolisant could offer a new treatment option for patients with narcolepsy. Funding: Bioprojet, France. © 2013 Elsevier Ltd.


Nena E.,Sleep Unit | Nena E.,Democritus University of Thrace | Steiropoulos P.,Sleep Unit | Constantinidis T.C.,Democritus University of Thrace | And 2 more authors.
Journal of Occupational and Environmental Medicine | Year: 2010

OBJECTIVES:: Purpose of the study was to assess work productivity in otherwise healthy obstructive sleep apnea (OSA) patients and to explore correlations between work productivity and different characteristics of OSA patients. METHODS:: Work productivity was assessed by the Endicott Work Productivity Scale (EWPS) to 115 polysomnographically confirmed OSA patients of working age, without comorbidities. Daytime sleepiness was measured by the Epworth Sleepiness Scale. RESULTS:: A significant correlation was revealed between EWPS and Epworth Sleepiness Scale scores (r = 0.127, P < 0.001). Mean EWPS score was significantly higher in somnolent versus nonsomnolent OSA patients (31.2 ± 16.2 vs 20.8 ± 11, respectively; P < 0.001). No other sleep or anthropometric characteristic correlated with EWPS. CONCLUSIONS:: This study demonstrates the negative effect of daytime sleepiness on work productivity of otherwise healthy OSA patients, highlighting the need of screening for OSA and sleepiness among working individuals. Copyright © 2010 by American College of Occupational and Environmental Medicine.


Hartley S.,Sleep Unit | Quera-Salva M.-A.,Sleep Unit | Machou M.,Sleep Unit
Journal of Clinical Sleep Medicine | Year: 2011

Sodium oxybate (GHB, Xyrem, Jazz Pharmaceuticals) is used to treat cataplexy in patients with narcolepsy. We report the case of a middle aged, normo-ponderal narcoleptic woman without risk factors who developed reversible sleep apnea and objective sleepiness when treated by sodium oxybate, with an apnea-hypopnea index (AHI) of 19.7 on sodium oxybate and AHI 4.8 without treatment. Despite a subjective improvement in vigilance, mean sleep latency on MWT decreased from 21 minutes to 8 minutes on sodium oxybate.


PubMed | Pediatric Noninvasive Ventilation and Sleep Unit, Sleep Unit and AP HP
Type: Journal Article | Journal: Journal of clinical monitoring and computing | Year: 2015

Polysomnography (PSG) is the gold standard for the analysis of sleep architecture but is not always available in routine practice, as it is time consuming and cumbersome for patients. Bispectral index (BIS), developed to quantify the deepness of general anesthesia, may be used as a simplified tool to evaluate natural sleep depth. We objectively recorded sleep architecture in young patients using the latest BIS Vista monitor and correlated BIS values with PSG sleep stages in order to determine BIS thresholds. Patients, referred for the screening of sleep apnea/hypopnea syndrome or differential diagnosis of hypersomnia were recruited. Overnight PSG and BIS were performed simultaneously. BIS values were averaged for each sleep stage. Pre-sleep wakefulness (W) and wake after sleep onset (WASO) were also differentiated. BIS values were discarded for a signal quality index <90%. ROC curves were plotted to discriminate sleep stages from each other. Twelve patients (5.7-29.3years old) were included. Mean BIS values were 838, 7612, 7711, 7010, 4310, and 7510 for W, WASO, N1, N2, N3 and R (REM) stages, respectively. BIS failed to distinguish W, WASO, N1 and R stages. BIS threshold that identified stage N2 was <73 (AUC=0.784, p<0.001) with low sensitivity (75%) and poor specificity (64%). BIS threshold that identified stage N3 was <55 (AUC=0.964, p<0.001) with an 87%-sensitivity and a 93%-specificity. BIS identified stage N3 with satisfactory sensitivity and specificity but is limited by its inability to distinguish REM sleep from wake. Further studies combining BIS with chin electromyogram and/or electrooculogram could be of interest.


PubMed | Montpellier University, Leiden University, University Pierre and Marie Curie, Catholic University of Leuven and 3 more.
Type: Comparative Study | Journal: Sleep | Year: 2015

To validate the Sustained Attention to Response Task (SART) as a treatment effect measure in narcolepsy, and to compare the SART with the Maintenance of Wakefulness Test (MWT) and the Epworth Sleepiness Scale (ESS).Validation of treatment effect measurements within a randomized controlled trial (RCT).Ninety-five patients with narcolepsy with or without cataplexy.The RCT comprised a double-blind, parallel-group, multicenter trial comparing the effects of 8-w treatments with pitolisant (BF2.649), modafinil, or placebo (NCT01067222). MWT, ESS, and SART were administered at baseline and after an 8-w treatment period. The severity of excessive daytime sleepiness and cataplexy was also assessed using the Clinical Global Impression scale (CGI-C).The SART, MWT, and ESS all had good reliability, obtained for the SART and MWT using two to three sessions in 1 day. The ability to distinguish responders from nonresponders, classified using the CGI-C score, was high for all measures, with a high performance for the SART (r = 0.61) and the ESS (r = 0.54).The Sustained Attention to Response Task is a valid and easy-to-administer measure to assess treatment effects in narcolepsy, enhanced by combining it with the Epworth Sleepiness Scale.

Loading Sleep Unit collaborators
Loading Sleep Unit collaborators