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Wen XL, Wu BZ, Li Y, Yi B, Peng X. Analysis of the aerodynamic characteristics of the upper airway in obstructive sleep apnea patients. J Dent Sci 2024; 19:329-337. [PMID: 38303889 PMCID: PMC10829548 DOI: 10.1016/j.jds.2023.03.013] [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: 01/09/2023] [Revised: 03/15/2023] [Indexed: 02/03/2024] Open
Abstract
Background/purpose This study was designed to explore upper airway aerodynamic characteristics in individuals diagnosed with obstructive sleep apnea (OSA) and to evaluate correlations between these characteristics and other anatomical upper airway findings in these patients. Materials and methods This was a retrospective study of 40 OSA patients (22 male, 18 female) who were stratified into groups with mild, moderate, and severe disease based upon overnight polysomnographic (PSG) recording results. Newtom5G cone-beam CT scans (CBCT) were conducted for all patients, and the resultant images were used to reconstruct three-dimensional images of the upper airways which were used to calculate aerodynamic characteristics. Differences in these characteristics between groups were evaluated with one-way ANOVAs, while relationships between anatomical and aerodynamic characteristics were assessed through Pearson correlation analyses. Results The aerodynamic of the upper airway has typical characteristic in severe group. There was a significant negative correlation in severe group between resistance during inspiration (Rin) and volume (V) (r = -0.693, P = 0.013), minimum axial area (MMA) (r = -0.685, P = 0.014), and lateral dimension (LAT) (r = -0.724, P = 0.008), resistance during expiration (Rex) and LAT (r = -0.923, P < 0.001). Conclusion This study showed that airway resistance during inspiration and expiration are most closely associated with upper airway collapse in OSA patients, with repetitive collapse occurring during both of these breathing processes. LAT may be an important anatomical factor associated with OSA pathogenesis and treatment.
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Affiliation(s)
- Xing-Long Wen
- Department of Oral and Maxillofacial Surgery, Peking University School and Hospital of Stomatology & National Center for Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Research Center of Oral Biomaterials and Digital Medical Devices, Beijing, PR China
| | - Bin-Zhang Wu
- First Clinical Division, Peking University School and Hospital of Stomatology & National Center for Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Research Center of Oral Biomaterials and Digital Medical Devices, Beijing, PR China
| | - Yang Li
- Department of Oral and Maxillofacial Surgery, Peking University School and Hospital of Stomatology & National Center for Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Research Center of Oral Biomaterials and Digital Medical Devices, Beijing, PR China
| | - Biao Yi
- Department of Oral and Maxillofacial Surgery, Peking University School and Hospital of Stomatology & National Center for Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Research Center of Oral Biomaterials and Digital Medical Devices, Beijing, PR China
| | - Xin Peng
- Department of Oral and Maxillofacial Surgery, Peking University School and Hospital of Stomatology & National Center for Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Research Center of Oral Biomaterials and Digital Medical Devices, Beijing, PR China
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Huang L, Xu Y, Gong X, Gao X. Anatomical phenotype of obstructive sleep apnea patients based on cluster analysis. Orthod Craniofac Res 2023; 26:608-617. [PMID: 36919983 DOI: 10.1111/ocr.12653] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2022] [Revised: 01/19/2023] [Accepted: 03/05/2023] [Indexed: 03/16/2023]
Abstract
OBJECTIVES To generate a novel subtype of obstructive sleep apnea (OSA) based on anatomical features and verify the differences in the response of different subtypes to orthodontic treatment, thus providing a theoretical reference for clinical decision-making. MATERIALS AND METHODS A K-means cluster analysis was performed for this retrospective serial study, which includes 722 OSA patients, aged 44.0 (36.0, 54.0) years, 80.2% male, with apnea-hypopnea index (AHI) of 23.2 (13.4, 39.6) events·h-1 , and body mass index (BMI) of 25.47 ± 3.00 kg·m-2 . All samples were divided into three subtypes based on AHI, BMI, and five variables of craniofacial measurements. Sixty-seven cases with mandibular advancement devices (MAD) therapeutic results were further applied to validate the efficacy and side effects of this treatment in different subtypes. RESULTS Two hundred and thirty patients (31.9%) were characterized as cluster 1: AHI of 17.65 (11.80, 30.42) events·h-1 , BMI of 23.65 ± 2.62 kg·m-2 , with skeletal Class II high-angle shape. Cluster 2 included 278 patients (38.5%): AHI of 17.00 (11.00, 26.48) events·h-1 , BMI of 25.36 ± 2.53 kg·m-2 , soft palate length (SPL) of 39.25 mm (36.12, 42.20), with basically normal skeleton and normal airway size. Cluster 3, consisting of 214 patients (29.6%), exhibited a combination of anatomical deformity and obesity, with the highest AHI and BMI of 45.35 (30.42, 62.53) events·h-1 and 27.57 ± 2.59 kg·m-2 respectively, but less deformity degree than cluster 1. Cluster 2 had the highest response rate and relatively mild side effects with MAD. CONCLUSIONS Orthodontic treatment based on anatomical morphology could exert a better effect on mild-moderate OSA patients with mild skeletal deformity.
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Affiliation(s)
- Liping Huang
- Department of Orthodontics, Peking University School and Hospital of Stomatology, Beijing, China
| | - Ying Xu
- Department of Orthodontics, Peking University School and Hospital of Stomatology, Beijing, China
| | - Xu Gong
- Department of Orthodontics, Peking University School and Hospital of Stomatology, Beijing, China
| | - Xuemei Gao
- Department of Orthodontics, Peking University School and Hospital of Stomatology, Beijing, China
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Votteler S, Knaack L, Janicki J, Fink GR, Burghaus L. Sex differences in polysomnographic findings in patients with obstructive sleep apnea. Sleep Med 2023; 101:429-436. [PMID: 36516599 DOI: 10.1016/j.sleep.2022.11.025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/25/2022] [Revised: 11/23/2022] [Accepted: 11/25/2022] [Indexed: 11/27/2022]
Abstract
BACKGROUND AND PURPOSE Sex differences in the clinical findings and the polysomnographic presentation of patients with obstructive sleep apnea (OSA) are compelling current research issues. For example, patients suffering from obstructive sleep apnea are predominantly male. While women are older than men and tend to have a higher body mass index, men typically present with a more severe form of obstructive sleep apnea. Using polysomnography, we investigated a German cohort, subdivided per severity levels of obstructive sleep apnea (apnea-hypopnea index: ≥5 to < 15/h (mild), ≥15 to < 30/h (moderate), and ≥30/h (severe)) to provide a detailed analysis of breathing and sleep parameters, accounting for body position effects and severity of illness. A deeper understanding of sex differences may allow targeted diagnosis and treatment adjustment. PATIENTS AND METHODS This retrospective study included a cohort of 1242 German patients (940 male, 302 female) who underwent overnight polysomnography at the private sleep laboratory "Intersom Köln", Center for Sleep Medicine and Sleep Research. In 1125 subjects (878 male, 247 female), obstructive sleep apnea was diagnosed. All patients were examined between January 01, 2018 and December 31, 2020, comparing anthropometric, sleep morphological, and respiratory polysomnographic findings. RESULTS Female patients with obstructive sleep apnea were significantly older than male patients (60.9 ± 12.3 vs. 56.9 ± 12.5 years, P < .001), also among OSA subgroups per OSA severity. The body mass index was similar in male and female patients (29.6 ± 5.1 vs. 29.2 ± 7.3 kg/m2, P > .05), including the three subgroups. Men were more likely to have severe obstructive sleep apnea (46.9%) than women (35.2%). Women exhibited a higher proportion of slow-wave sleep than men (129.4 ± 52.8 vs. 104.2 ± 53.2 min; P < .001). The apnea-hypopnea index of total sleep time was significantly greater in male than female patients (32.9 ± 21.2 vs. 27.2 ± 20.2 per hour; P < .001). Female patients had a higher apnea-hypopnea index during rapid-eye-movement (REM) sleep (34.0 ± 23.8 vs. 31.8 ± 22.3 per hour; P = .171). A statistically significant difference in the apnea-hypopnea index during REM sleep between sexes was found when the obstructive sleep apnea severity was considered. Women had a lower apnea-hypopnea index in non-rapid eye-movement (NREM) sleep than men (25.7 ± 21.1 vs. 32.7 ± 22.3 per hour; P < .001). The oxygen desaturation index (29.9 ± 20.3 vs. 22.4 ± 19.4%; P < .001) and an oxygen desaturation below 90% (9.4 ± 14.0 vs. 6.8 ± 11.7%; P = .003) was greater in men than in women. In severe obstructive sleep apnea, the oxygen desaturation index was similar between the sexes (45.0 ± 17.8 vs. 41.1 ± 20.9%; P = .077). Male patients showed a higher supine apnea-hypopnea-index than female patients. (45.7 ± 26.7 vs 36.1 ± 22.7 per hour; P < .001). CONCLUSION The present noninvasive, retrospective registry study is the first to examine sex differences in OSA in such a large German population in terms of respiratory and sleep parameters, taking into account the effects of body position and severity of the disease. We could confirm and extend observations from previous studies. Female patients were significantly older than the male patients. The apnea-hypopnea index was higher in male than in female patients. Women showed a higher apnea-hypopnea index in REM sleep and a lower one in NREM sleep. Men were desaturated more often and were more affected by supine-dependent obstructive sleep apnea than women. Contrary to the literature, there were no significant differences in body mass index (BMI) between the sexes. With increasing age and BMI, the gender differences become less significant.
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Affiliation(s)
- Sinje Votteler
- Sleep Laboratory "Intersom Köln" Center for Sleep Medicine and Sleep Research, Im Mediapark 4D, Cologne, 50670, Germany; Department of Neurology, Faculty of Medicine and University Hospital, Cologne, 50937, Germany.
| | - Lennart Knaack
- Sleep Laboratory "Intersom Köln" Center for Sleep Medicine and Sleep Research, Im Mediapark 4D, Cologne, 50670, Germany.
| | - Jaroslaw Janicki
- Sleep Laboratory "Intersom Köln" Center for Sleep Medicine and Sleep Research, Im Mediapark 4D, Cologne, 50670, Germany.
| | - Gereon R Fink
- Department of Neurology, Faculty of Medicine and University Hospital, Cologne, 50937, Germany; Cognitive Neuroscience, Institute of Neuroscience and Medicine (INM-3), Research Centre Jülich, Jülich, 52428, Germany.
| | - Lothar Burghaus
- Department of Neurology, Faculty of Medicine and University Hospital, Cologne, 50937, Germany; Department of Neurology, Heilig-Geist-Hospital, Graseggerstraße 105, Cologne, Germany.
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Li Z, Cai S, Wang J, Chen R. Predictors of the Efficacy for Daytime Sleepiness in Patients With Obstructive Sleep Apnea With Continual Positive Airway Pressure Therapy: A Meta-Analysis of Randomized Controlled Trials. Front Neurol 2022; 13:911996. [PMID: 35832171 PMCID: PMC9271709 DOI: 10.3389/fneur.2022.911996] [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: 04/04/2022] [Accepted: 05/24/2022] [Indexed: 11/23/2022] Open
Abstract
Objective The main aim of this meta-analysis was to evaluate the predictors of the efficacy of continuous positive airway pressure (CPAP) in ameliorating excessive daytime sleepiness (EDS) in patients with obstructive sleep apnea (OSA). Methods Randomized controlled trials (RCTs) published between January 1994 and October 2021 were searched in the PubMed, EMBASE, and Cochrane Library databases. The weighted mean differences (WMDs) for the Epworth Sleepiness Scale (ESS) scores, the Multiple Sleep Latency Test (MSLT), and the Maintenance of Wakefulness Test (MWT) were pooled in STATA. Results A total of 41 RCTs involving 7,332 patients were included. CPAP therapy was found to be significantly associated with changes in ESS (WMD = −2.14, P < 0.001), MSLT (WMD = 1.23, P < 0.001), and MWT (WMD = 1.6, P < 0.001). Meta-regression analysis and subgroup analysis indicated that in mild OSA, the efficacy of CPAP therapy for subjective EDS was limited to patients <50 years of age, with a baseline body mass index (BMI) of ≥30 kg/m2, baseline ESS score of ≥11, therapy adherence for ≥3 h/night, and treatment duration of ≥2 months. In moderate OSA, significant differences were observed in the changes in ESS among groups stratified by baseline ESS score (P = 0.005), adherence (P < 0.001), treatment duration (P = 0.009), and trial design type (P = 0.001). In severe OSA, this difference was observed among groups stratified by baseline BMI (P = 0.028), baseline ESS score (P = 0.001), and adherence (P = 0.047). Patients with moderate-severe OSA but not mild OSA showed significant improvements in MSLT. Patients with the age <50 years or BMI ≥33 kg/m2 had a more significant increase in MWT. Conclusion Continuous positive airway pressure therapy improved subjective and objective sleepiness in patients with OSA. Age, baseline BMI, baseline ESS score, adherence, and duration of treatment may predict the effects of CPAP on EDS in patients with OSA. Notably, the baseline ESS scores and adherence were stable predictors regardless of OSA severity.
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Affiliation(s)
- Zhiqiang Li
- Department of Respiratory and Critical Care Medicine, Sleep Center, The Second Affiliated Hospital of Soochow University, Soochow University, Suzhou, China
| | - Sijie Cai
- Department of Respiratory and Critical Care Medicine, Sleep Center, The Second Affiliated Hospital of Soochow University, Soochow University, Suzhou, China
- Department of Pulmonary and Critical Care Medicine Affiliated Kunshan Hospital of Jiangsu University, Suzhou, China
| | - Jing Wang
- Department of Respiratory and Critical Care Medicine, Sleep Center, The Second Affiliated Hospital of Soochow University, Soochow University, Suzhou, China
| | - Rui Chen
- Department of Respiratory and Critical Care Medicine, Sleep Center, The Second Affiliated Hospital of Soochow University, Soochow University, Suzhou, China
- *Correspondence: Rui Chen
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Silveira MG, Sampol G, Mota-Foix M, Ferrer J, Lloberes P. Cluster-derived obstructive sleep apnea phenotypes and outcomes at 5-year follow-up. J Clin Sleep Med 2022; 18:597-607. [PMID: 34569926 PMCID: PMC8804983 DOI: 10.5664/jcsm.9674] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
STUDY OBJECTIVES Obstructive sleep apnea (OSA) is a heterogeneous, complex disease. We aimed to identify OSA phenotypes through cluster analysis and to perform a long-term follow-up to validate the phenotypes. METHODS We applied a partitioning around medioids technique in a cohort of 1,217 participants recently diagnosed with OSA. We performed a 5-year follow-up analyzing the incidence of comorbidities, chronic medication, hospital admissions, mortality, and the influence of continuous positive airway pressure treatment on mortality risk. RESULTS We identified three phenotypes: two predominantly male clusters, one composed of middle-aged participants with overweight, moderate OSA, and cardiovascular risk factors and the other consisting of older, obese participants with severe OSA, cardiovascular risk factors, ischemic heart disease (18.4%), and atrial fibrillation (9.7%). The third cluster was composed of 77% female participants with moderate OSA; cardiovascular risk factors; the highest prevalence of depression (15.7%); and high prescription of antidepressants (55.1%), anxiolytics (40.0%), hypnotics, sedatives (11.1%), nonsteroidal anti-inflammatory drugs (67.9%), and weak opioids (15.1%). The baseline characteristics of each cluster maintained the same trend over time regarding the incidence of new comorbidities, medication intake, hospitalization rates, and reasons for admission. The absence of continuous positive airway pressure treatment was associated with a significantly higher risk of all-cause mortality (hazard ratio 5.84, confidence interval 2.9-11.8), especially in the older men (hazard ratio 7.7, confidence interval 4.06-14.63) and predominantly female clusters (hazard ratio 2.79, confidence interval 1.34-5.79). CONCLUSIONS We identified three phenotypes with relevant clinical and prognostic implications in order to improve personalized strategies in OSA management. CITATION Silveira MG, Sampol G, Mota-Foix M, Ferrer J, Lloberes P. Cluster-derived obstructive sleep apnea phenotypes and outcomes at 5-year follow-up. J Clin Sleep Med. 2022;18(2):597-607.
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Affiliation(s)
- María Guadalupe Silveira
- Pneumology Department, Parc Sanitari Sant Joan de Déu, Sant Boi de Llobregat, Spain,Medicine Department, Universitat Autònoma de Barcelona, Barcelona, Spain
| | - Gabriel Sampol
- Medicine Department, Universitat Autònoma de Barcelona, Barcelona, Spain,Multidisciplinary Sleep Unit, Pneumology Department, Vall d’Hebron University Hospital, Barcelona, Spain,Pneumology Department, Vall d’Hebron University Hospital, Barcelona, Spain,Centro de Investigación Biomédica en Red Enfermedades Respiratorias (CIBERES), Instituto de la Salud Carlos III (ISCIIII), Madrid, Spain
| | - Miriam Mota-Foix
- Statistics and Bioinformatics Unit, Vall d’Hebron Research Institute, Barcelona, Spain
| | - Jaume Ferrer
- Medicine Department, Universitat Autònoma de Barcelona, Barcelona, Spain,Pneumology Department, Vall d’Hebron University Hospital, Barcelona, Spain,Centro de Investigación Biomédica en Red Enfermedades Respiratorias (CIBERES), Instituto de la Salud Carlos III (ISCIIII), Madrid, Spain
| | - Patricia Lloberes
- Multidisciplinary Sleep Unit, Pneumology Department, Vall d’Hebron University Hospital, Barcelona, Spain,Pneumology Department, Vall d’Hebron University Hospital, Barcelona, Spain,Centro de Investigación Biomédica en Red Enfermedades Respiratorias (CIBERES), Instituto de la Salud Carlos III (ISCIIII), Madrid, Spain,Address correspondence to: Patricia Lloberes, MD, PhD, Servicio de Neumología, Hospital Universitario Vall d’Hebron, Passeig de la Vall d’Hebron 119, 08035, Barcelona, Spain;
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Fenotipos clínicos en el síndrome de apnea obstructiva del sueño. REVISTA MÉDICA CLÍNICA LAS CONDES 2021. [DOI: 10.1016/j.rmclc.2021.09.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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Kuo IC, Hsin LJ, Lee LA, Fang TJ, Tsai MS, Lee YC, Shen SC, Li HY. Prediction of Epiglottic Collapse in Obstructive Sleep Apnea Patients: Epiglottic Length. Nat Sci Sleep 2021; 13:1985-1992. [PMID: 34764713 PMCID: PMC8573216 DOI: 10.2147/nss.s336019] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/30/2021] [Accepted: 10/22/2021] [Indexed: 11/23/2022] Open
Abstract
OBJECTIVE This study aims to explore the factors that contribute to epiglottic collapse (EC) in patients with obstructive sleep apnea (OSA). METHODS This study enrolled 35 patients (34 males; median age, 39 years; median apnea-hypopnea index (AHI), 55.4 events/h; median body mass index (BMI), 26.9 kg/m2). EC (epiglottis attaching onto the posterior pharyngeal wall) was diagnosed by drug-induced sleep computed tomography (DI-SCT). Three dimensions were assessed for comparison between the EC and non-EC (NEC) groups that included anatomical measurement: epiglottic length and angle, endoscopic classification of epiglottis obstructing the glottis (Type I, none; Type II, partial; and Type III, total), and dynamic hyoid movement during DI-SCT (Δ hyoid = √(x2 + y2), maximal displacement of hyoid in x and y axes during sleep breathing cycle). RESULTS EC was found in 12 patients (34%). No difference in age, gender, AHI, and BMI between the two groups was noted. The anatomical measurement revealed that epiglottis length was significantly different between the EC and NEC groups (21.2 vs 15.8 mm; p < 0.001), with a cutoff value of 16.6 mm (sensitivity, 100%; specificity, 65.2%). The EC group patients showed larger hyoid movement than the NEC group patients (Δ hyoid, 4.8 vs 3.0 mm; p = 0.027). By contrast, epiglottic angle and endoscopic classification revealed an insignificant difference between the two groups. CONCLUSION Epiglottis is a potential collapse site among multilevel obstruction in moderate to severe OSA patients. Epiglottic length is highly sensitive in predicting EC, with the cutoff value of 16.6 mm. Hyoid movement plays a role in contributing to EC in OSA patients.
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Affiliation(s)
- I-Chun Kuo
- Departments of Otolaryngology-Head & Neck Surgery, Chang Gung Memorial Hospital, Linkou Main Branch, Tao-yuan City, Taiwan.,College of Medicine, Chang Gung University, Tao-Yuan, Taiwan
| | - Li-Jen Hsin
- Departments of Otolaryngology-Head & Neck Surgery, Chang Gung Memorial Hospital, Linkou Main Branch, Tao-yuan City, Taiwan.,College of Medicine, Chang Gung University, Tao-Yuan, Taiwan
| | - Li-Ang Lee
- Departments of Otolaryngology-Head & Neck Surgery, Chang Gung Memorial Hospital, Linkou Main Branch, Tao-yuan City, Taiwan.,College of Medicine, Chang Gung University, Tao-Yuan, Taiwan
| | - Tuan-Jen Fang
- Departments of Otolaryngology-Head & Neck Surgery, Chang Gung Memorial Hospital, Linkou Main Branch, Tao-yuan City, Taiwan.,College of Medicine, Chang Gung University, Tao-Yuan, Taiwan
| | - Ming-Shao Tsai
- College of Medicine, Chang Gung University, Tao-Yuan, Taiwan.,Departments of Otolaryngology-Head & Neck Surgery, Chang Gung Memorial Hospital, Chiayi Branch, Chiayi City, Taiwan
| | - Yi-Chan Lee
- College of Medicine, Chang Gung University, Tao-Yuan, Taiwan.,Departments of Otolaryngology-Head & Neck Surgery, Chang Gung Memorial Hospital, Keelung Branch, Keelung City, Taiwan
| | - Shih-Chieh Shen
- College of Medicine, Chang Gung University, Tao-Yuan, Taiwan.,Departments of Otolaryngology-Head & Neck Surgery, New Taipei City Municipal Tucheng Hospital, New Taipei City, Taiwan
| | - Hsueh-Yu Li
- Departments of Otolaryngology-Head & Neck Surgery, Chang Gung Memorial Hospital, Linkou Main Branch, Tao-yuan City, Taiwan.,College of Medicine, Chang Gung University, Tao-Yuan, Taiwan
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Silveira MG, Lloberes P. Análisis de clúster para identificar fenotipos de síndrome de apneas-hipopneas del sueño: ¿hacia dónde vamos? Arch Bronconeumol 2020; 56:689-690. [DOI: 10.1016/j.arbres.2019.11.023] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2019] [Accepted: 11/27/2019] [Indexed: 12/12/2022]
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Chuang HH, Hsu JF, Chuang LP, Chen NH, Huang YS, Li HY, Chen JY, Lee LA, Huang CG. Differences in Anthropometric and Clinical Features among Preschoolers, School-Age Children, and Adolescents with Obstructive Sleep Apnea-A Hospital-Based Study in Taiwan. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2020; 17:ijerph17134663. [PMID: 32610444 PMCID: PMC7370095 DOI: 10.3390/ijerph17134663] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/28/2020] [Revised: 06/15/2020] [Accepted: 06/24/2020] [Indexed: 12/16/2022]
Abstract
Pediatric obstructive sleep apnea (OSA) is associated with adverse health outcomes; however, little is known about the diversity of this population. This retrospective study aims to investigate age-related differences in the anthropometric and clinical features of this population. A total of 253 Taiwanese children (70 (27.7%) girls and 183 (72.3%) boys) with OSA were reviewed. Their median age, body mass index (BMI) z-score, and apnea-hypopnea index were 6.9 years, 0.87, and 9.5 events/h, respectively. The cohort was divided into three subgroups: ‘preschoolers’ (≥2 and <6 years), ‘school-age children’ (≥6 and <10 years), and ‘adolescents (≥10 and <18 years)’. The percentage of the male sex, BMI z-score, neck circumference, systolic blood pressure z-score, neutrophil-to-lymphocyte ratio, and platelet-to-lymphocyte ratio tended to increase with age. Adenoid grades tended to decrease with age. Overall, disease severity was independently correlated with neck circumference, tonsil size, and adenoid grade. Increased neck circumference and tonsillar hypertrophy were the most influential factors for younger children, whereas adenoidal hypertrophy became more important at an older age. In conclusion, gender prevalence ratio, anthropometric measures, and clinical features varied with age, and the pathogenic drivers were not necessarily the same as the aggravating ones.
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Affiliation(s)
- Hai-Hua Chuang
- Department of Family Medicine, Chang Gung Memorial Hospital, Taipei and Linkou Branches, Taoyuan 33305, Taiwan; (H.-H.C.); (J.-Y.C.)
- Department of Industrial Engineering and Management, National Taipei University of Technology, Taipei 10608, Taiwan
- Obesity Institute, Genomic Medicine Institute, Geisinger, Danville, 17822 PA, USA
- College of Medicine, Chang Gung University, Taoyuan 33302, Taiwan; (J.-F.H.); (L.-P.C.); (N.-H.C.); (Y.-S.H.); (H.-Y.L.)
| | - Jen-Fu Hsu
- College of Medicine, Chang Gung University, Taoyuan 33302, Taiwan; (J.-F.H.); (L.-P.C.); (N.-H.C.); (Y.-S.H.); (H.-Y.L.)
- Department of Pediatrics, Chang Gung Memorial Hospital, Linkou Branch, 33305 Taoyuan, Taiwan
| | - Li-Pang Chuang
- College of Medicine, Chang Gung University, Taoyuan 33302, Taiwan; (J.-F.H.); (L.-P.C.); (N.-H.C.); (Y.-S.H.); (H.-Y.L.)
- Department of Pulmonary and Critical Care Medicine, Sleep Center, Chang Gung Memorial Hospital, Linkou Branch, Taoyuan 33305, Taiwan
| | - Ning-Hung Chen
- College of Medicine, Chang Gung University, Taoyuan 33302, Taiwan; (J.-F.H.); (L.-P.C.); (N.-H.C.); (Y.-S.H.); (H.-Y.L.)
- Department of Pulmonary and Critical Care Medicine, Sleep Center, Chang Gung Memorial Hospital, Linkou Branch, Taoyuan 33305, Taiwan
| | - Yu-Shu Huang
- College of Medicine, Chang Gung University, Taoyuan 33302, Taiwan; (J.-F.H.); (L.-P.C.); (N.-H.C.); (Y.-S.H.); (H.-Y.L.)
- Department of Child Psychiatry, Sleep Center, Chang Gung Memorial Hospital, Linkou Branch, Taoyuan 33305, Taiwan
| | - Hsueh-Yu Li
- College of Medicine, Chang Gung University, Taoyuan 33302, Taiwan; (J.-F.H.); (L.-P.C.); (N.-H.C.); (Y.-S.H.); (H.-Y.L.)
- Department of Otorhinolaryngology-Head and Neck Surgery, Sleep Center, Chang Gung Memorial Hospital, Linkou Branch, Taoyuan 33305, Taiwan
| | - Jau-Yuan Chen
- Department of Family Medicine, Chang Gung Memorial Hospital, Taipei and Linkou Branches, Taoyuan 33305, Taiwan; (H.-H.C.); (J.-Y.C.)
- College of Medicine, Chang Gung University, Taoyuan 33302, Taiwan; (J.-F.H.); (L.-P.C.); (N.-H.C.); (Y.-S.H.); (H.-Y.L.)
| | - Li-Ang Lee
- College of Medicine, Chang Gung University, Taoyuan 33302, Taiwan; (J.-F.H.); (L.-P.C.); (N.-H.C.); (Y.-S.H.); (H.-Y.L.)
- Department of Otorhinolaryngology-Head and Neck Surgery, Sleep Center, Chang Gung Memorial Hospital, Linkou Branch, Taoyuan 33305, Taiwan
- Correspondence: (L.-A.L.); (C.-G.H.); Tel.: +886-3328-1200 (ext. 3968) (L.-A.L.); +886-3328-1200 (ext. 5653) (C.-G.H.)
| | - Chung-Guei Huang
- Department of Laboratory Medicine, Chang Gung Memorial Hospital, Linkou Branch, Taoyuan 33305, Taiwan
- Department of Medical Biotechnology and Laboratory Science, Graduate Institute of Biomedical Sciences, Chang Gung University, Taoyuan 33302, Taiwan
- Correspondence: (L.-A.L.); (C.-G.H.); Tel.: +886-3328-1200 (ext. 3968) (L.-A.L.); +886-3328-1200 (ext. 5653) (C.-G.H.)
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Nikolopoulou M, Aarab G, Ahlberg J, Hamburger HL, de Lange J, Lobbezoo F. Oral appliance therapy versus nasal continuous positive airway pressure in obstructive sleep apnea: A randomized, placebo-controlled trial on temporomandibular side-effects. Clin Exp Dent Res 2020; 6:400-406. [PMID: 32246748 PMCID: PMC7453778 DOI: 10.1002/cre2.288] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2020] [Revised: 03/05/2020] [Accepted: 03/06/2020] [Indexed: 11/21/2022] Open
Abstract
Purpose To assess the differences in the frequency of clinical signs of temporomandibular disorder (TMD) pain and mandibular function impairment between mandibular advancement device (MAD) and nasal continuous positive airway pressure (nCPAP) therapies in obstructive sleep apnea (OSA) patients at baseline and after 6 month of treatment. Methods This study concerns a secondary analysis of a randomized placebo‐controlled trial in which different treatment effects of an objectively titrated MAD were compared with those of nCPAP and an intra‐oral placebo appliance in a parallel design. Sixty‐four mild to severe OSA patients (52.0 ± 9.6 years) were randomly assigned to these three groups. All patients underwent a shortened functional examination of their masticatory system at baseline and after 6 months to establish the presence of clinical signs of TMD pain. Mandibular function impairment was assessed with a questionnaire. Results Clinical signs of TMD pain were only rarely present at baseline and therapy evaluation. No significant differences were found between the three groups in the (low) frequency of clinical signs of TMD pain at both time points (p = .401–.176). In addition, the (low) scores of mandibular function impairment did not differ between the three groups either, neither at baseline (p = .744) nor after 6 months (p = .359). Conclusions A low frequency of clinical signs of TMD pain in mild to severe OSA patients was found after 6 months, regardless of treatment with MAD or nCPAP. In addition, no difference in mandibular function impairment was observed between the different treatment modalities.
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Affiliation(s)
- Maria Nikolopoulou
- Department of Orofacial Pain and Dysfunction, Academic Centre of Dentistry Amsterdam (ACTA), University of Amsterdam and Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
| | - Ghizlane Aarab
- Department of Orofacial Pain and Dysfunction, Academic Centre of Dentistry Amsterdam (ACTA), University of Amsterdam and Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
| | - Jari Ahlberg
- Department of Oral and Maxillofacial Diseases, University of Helsinki, Helsinki, Finland
| | - Hans L Hamburger
- Amsterdam Sleep Centre, Boerhaave Medical Centre, Amsterdam, The Netherlands
| | - Jan de Lange
- Department of Oral and Maxillofacial Surgery, Amsterdam University Medical Centre and Academic Centre for Dentistry Amsterdam (ACTA), Amsterdam, The Netherlands
| | - Frank Lobbezoo
- Department of Orofacial Pain and Dysfunction, Academic Centre of Dentistry Amsterdam (ACTA), University of Amsterdam and Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
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11
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Taherian S, Rahai H, Lopez S, Shin J, Jafari B. Evaluation of human obstructive sleep apnea using computational fluid dynamics. Commun Biol 2019; 2:423. [PMID: 31799426 PMCID: PMC6872714 DOI: 10.1038/s42003-019-0668-z] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2018] [Accepted: 10/28/2019] [Indexed: 11/21/2022] Open
Abstract
Obstructive sleep apnea (OSA) severity might be correlated to the flow characteristics of the upper airways. We aimed to investigate the severity of OSA based on 3D models constructed from CT scans coupled with computational fluid dynamics (CFD) simulations. The CT scans of seven adult patients diagnosed with OSA were used to reconstruct the 3D models of the upper airways and CFD modeling and analyses were performed. Results from the fluid simulations were compared with the apnea-hypopnea index. Here we show a correlation between a CFD-based parameter, the adjusted pressure coefficient (Cp*), and the respective apnea-hypopnea index (Pearson's r = 0.91, p = 0.004), which suggests that the anatomical-based model coupled with CFD could provide functional and localized information for different regions of the upper airways.
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Affiliation(s)
- Shahab Taherian
- Center for Energy and Environmental Research and Services, California State University Long Beach, Long Beach, CA USA
- Department of Internal Medicine, University of California Irvine School of Medicine, Irvine, CA USA
| | - Hamid Rahai
- Center for Energy and Environmental Research and Services, California State University Long Beach, Long Beach, CA USA
| | - Samuel Lopez
- Center for Energy and Environmental Research and Services, California State University Long Beach, Long Beach, CA USA
| | - Jamie Shin
- Center for Energy and Environmental Research and Services, California State University Long Beach, Long Beach, CA USA
| | - Behrouz Jafari
- Department of Internal Medicine, University of California Irvine School of Medicine, Irvine, CA USA
- Section of Pulmonary, Critical Care, and Sleep Medicine, Veterans Affairs Long Beach Healthcare System, Long Beach, CA USA
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12
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Malhotra A, Schwartz AR, Schneider H, Owens RL, DeYoung P, Han MK, Wedzicha JA, Hansel NN, Zeidler MR, Wilson KC, Badr MS. Research Priorities in Pathophysiology for Sleep-disordered Breathing in Patients with Chronic Obstructive Pulmonary Disease. An Official American Thoracic Society Research Statement. Am J Respir Crit Care Med 2019; 197:289-299. [PMID: 29388824 DOI: 10.1164/rccm.201712-2510st] [Citation(s) in RCA: 51] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
BACKGROUND Obstructive sleep apnea (OSA) and chronic obstructive pulmonary disease (COPD) are common conditions; the co-occurrence of these diseases, called the overlap syndrome (OVS), has been associated with poor health outcomes. PURPOSE The purpose of this Official American Thoracic Society Research Statement is to describe pathophysiology, epidemiology, outcomes, diagnostic metrics, and treatment of OVS, as well as to identify important gaps in knowledge and make recommendations for future research. METHODS Clinicians and researchers with expertise in sleep medicine, pulmonary medicine, or both were invited to participate. Topics were divided among the participants according to their interest and expertise. A literature search was conducted; the search was not a formal systematic review. Evidence was considered and supplemented with the panelists' nonsystematic clinical observations. Important knowledge gaps were identified. RESULTS Recommendations for research to fill existing knowledge gaps were made. The recommendations were formulated by discussion and consensus. CONCLUSIONS Many important questions about OVS exist. This American Thoracic Society Research Statement highlights the types of research that leading clinicians and researchers believe will have the greatest impact on better understanding the spectrum of disease, improving diagnosis, and optimizing therapy.
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13
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Light M, McCowen K, Malhotra A, Mesarwi OA. Sleep apnea, metabolic disease, and the cutting edge of therapy. Metabolism 2018; 84:94-98. [PMID: 28966076 PMCID: PMC5874161 DOI: 10.1016/j.metabol.2017.09.004] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/08/2017] [Revised: 09/11/2017] [Accepted: 09/21/2017] [Indexed: 12/16/2022]
Abstract
Obstructive sleep apnea (OSA) is common, and many cross-sectional and longitudinal studies have established OSA as an independent risk factor for the development of a variety of adverse metabolic disease states, including hypertension, insulin resistance, type 2 diabetes, nonalcoholic fatty liver disease, dyslipidemia, and atherosclerosis. Nasal continuous positive airway pressure (CPAP) has long been the mainstay of therapy for OSA, but definitive studies demonstrating the efficacy of CPAP in improving metabolic outcomes, or in reducing incident disease burden, are lacking; moreover, CPAP has variable rates of adherence. Therefore, the future of OSA management, particularly with respect to limiting OSA-related metabolic dysfunction, likely lies in a coming wave of alternative approaches to endophenotyping OSA patients, personalized care, and defining and targeting mechanisms of OSA-induced adverse health outcomes.
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Affiliation(s)
- Matthew Light
- Division of Pulmonary, Critical Care, and Sleep Medicine, UC San Diego Department of Medicine, La Jolla, CA, United States.
| | - Karen McCowen
- Division of Endocrinology, UC San Diego Department of Medicine, La Jolla, CA, United States.
| | - Atul Malhotra
- Division of Pulmonary, Critical Care, and Sleep Medicine, UC San Diego Department of Medicine, La Jolla, CA, United States.
| | - Omar A Mesarwi
- Division of Pulmonary, Critical Care, and Sleep Medicine, UC San Diego Department of Medicine, La Jolla, CA, United States.
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14
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15
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Idris G, Galland B, Robertson CJ, Gray A, Farella M. Mandibular advancement appliances for sleep-disordered breathing in children: A randomized crossover clinical trial. J Dent 2018; 71:9-17. [DOI: 10.1016/j.jdent.2018.01.006] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2017] [Revised: 01/13/2018] [Accepted: 01/16/2018] [Indexed: 12/16/2022] Open
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16
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Zinchuk AV, Jeon S, Koo BB, Yan X, Bravata DM, Qin L, Selim BJ, Strohl KP, Redeker NS, Concato J, Yaggi HK. Polysomnographic phenotypes and their cardiovascular implications in obstructive sleep apnoea. Thorax 2017; 73:472-480. [PMID: 28935698 DOI: 10.1136/thoraxjnl-2017-210431] [Citation(s) in RCA: 157] [Impact Index Per Article: 22.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2017] [Revised: 07/13/2017] [Accepted: 08/14/2017] [Indexed: 11/04/2022]
Abstract
BACKGROUND Obstructive sleep apnoea (OSA) is a heterogeneous disorder, and improved understanding of physiologic phenotypes and their clinical implications is needed. We aimed to determine whether routine polysomnographic data can be used to identify OSA phenotypes (clusters) and to assess the associations between the phenotypes and cardiovascular outcomes. METHODS Cross-sectional and longitudinal analyses of a multisite, observational US Veteran (n=1247) cohort were performed. Principal components-based clustering was used to identify polysomnographic features in OSA's four pathophysiological domains (sleep architecture disturbance, autonomic dysregulation, breathing disturbance and hypoxia). Using these features, OSA phenotypes were identified by cluster analysis (K-means). Cox survival analysis was used to evaluate longitudinal relationships between clusters and the combined outcome of incident transient ischaemic attack, stroke, acute coronary syndrome or death. RESULTS Seven patient clusters were identified based on distinguishing polysomnographic features: 'mild', 'periodic limb movements of sleep (PLMS)', 'NREM and arousal', 'REM and hypoxia', 'hypopnoea and hypoxia', 'arousal and poor sleep' and 'combined severe'. In adjusted analyses, the risk (compared with 'mild') of the combined outcome (HR (95% CI)) was significantly increased for 'PLMS', (2.02 (1.32 to 3.08)), 'hypopnoea and hypoxia' (1.74 (1.02 to 2.99)) and 'combined severe' (1.69 (1.09 to 2.62)). Conventional apnoea-hypopnoea index (AHI) severity categories of moderate (15≤AHI<30) and severe (AHI ≥30), compared with mild/none category (AHI <15), were not associated with increased risk. CONCLUSIONS Among patients referred for OSA evaluation, routine polysomnographic data can identify physiological phenotypes that capture risk of adverse cardiovascular outcomes otherwise missed by conventional OSA severity classification.
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Affiliation(s)
- Andrey V Zinchuk
- Department of Medicine, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Sangchoon Jeon
- Division of Acute Care/Health Systems, Yale School of Nursing, Yale University, New Haven, Connecticut, USA
| | - Brian B Koo
- Department of Neurology, Yale University, New Haven, Connecticut, USA
| | - Xiting Yan
- Department of Medicine, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Dawn M Bravata
- Departments of Neurology and Internal Medicine, Richard L. Roudenbush VA Medical Center, Indianapolis, Indiana, USA
| | - Li Qin
- Center for Outcomes Research and Evaluation, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Bernardo J Selim
- Section of Pulmonary, Critical Care, and Sleep Medicine, Mayo Clinic, Rochester, Minnesota, USA
| | - Kingman P Strohl
- Section of Pulmonary, Critical Care, and Sleep Medicine, Case Western Reserve University, Cleveland, Ohio, USA
| | - Nancy S Redeker
- Division of Acute Care/Health Systems, Yale School of Nursing, Yale University, New Haven, Connecticut, USA
| | - John Concato
- Department of Medicine, Yale University School of Medicine, New Haven, Connecticut, USA.,Clinical Epidemiology Research Center, Veterans Affairs Connecticut Healthcare System, West Haven, Connecticut, USA
| | - Henry K Yaggi
- Department of Medicine, Yale University School of Medicine, New Haven, Connecticut, USA
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17
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Phenotypes in obstructive sleep apnea: A definition, examples and evolution of approaches. Sleep Med Rev 2016; 35:113-123. [PMID: 27815038 DOI: 10.1016/j.smrv.2016.10.002] [Citation(s) in RCA: 183] [Impact Index Per Article: 22.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2016] [Revised: 07/23/2016] [Accepted: 10/05/2016] [Indexed: 01/02/2023]
Abstract
Obstructive sleep apnea (OSA) is a complex and heterogeneous disorder and the apnea hypopnea index alone can not capture the diverse spectrum of the condition. Enhanced phenotyping can improve prognostication, patient selection for clinical trials, understanding of mechanisms, and personalized treatments. In OSA, multiple condition characteristics have been termed "phenotypes." To help classify patients into relevant prognostic and therapeutic categories, an OSA phenotype can be operationally defined as: "A category of patients with OSA distinguished from others by a single or combination of disease features, in relation to clinically meaningful attributes (symptoms, response to therapy, health outcomes, quality of life)." We review approaches to clinical phenotyping in OSA, citing examples of increasing analytic complexity. Although clinical feature based OSA phenotypes with significant prognostic and treatment implications have been identified (e.g., excessive daytime sleepiness OSA), many current categorizations lack association with meaningful outcomes. Recent work focused on pathophysiologic risk factors for OSA (e.g., arousal threshold, craniofacial morphology, chemoreflex sensitivity) appears to capture heterogeneity in OSA, but requires clinical validation. Lastly, we discuss the use of machine learning as a promising phenotyping strategy that can integrate multiple types of data (genomic, molecular, cellular, clinical) to identify unique, meaningful OSA phenotypes.
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Lam MTY, Grandner MA, Malhotra A. Lungs can tell time-a highlight from 2016 ATS session on clock genes, inflammation, immunology, and sleep. J Thorac Dis 2016; 8:S579-81. [PMID: 27606100 DOI: 10.21037/jtd.2016.07.36] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Michael T Y Lam
- Department of Internal Medicine, UCSD, San Diego, CA 92103, USA
| | - Michael A Grandner
- Department of Psychiatry, University of Arizona, Tucson, Arizona 85724-5002, USA
| | - Atul Malhotra
- Division of Pulmonary, Critical Care & Sleep Medicine, La Jolla, CA 92037, USA
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Affiliation(s)
- Patrick J Strollo
- Deaprtment of Medicine and Clinical and Translational Science, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
| | - Atul Malhotra
- Deaprtment of Medicine, University of California San Diego, San Diego, USA
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20
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Grigg J, Barben J, Bohlin K, Everard ML, Hall G, Pijnenburg M, Priftis KN, Rusconi F, Midulla F. Key paediatric messages from Amsterdam. ERJ Open Res 2016; 2:00020-2016. [PMID: 27730186 PMCID: PMC5005169 DOI: 10.1183/23120541.00020-2016] [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: 02/12/2016] [Accepted: 03/28/2016] [Indexed: 11/05/2022] Open
Abstract
The Paediatric Assembly of the European Respiratory Society (ERS) maintained its high profile at the 2015 ERS International Congress in Amsterdam. There were symposia on preschool wheeze, respiratory sounds and cystic fibrosis; an educational skills workshop on paediatric respiratory resuscitation; a hot topic session on risk factors and early origins of respiratory diseases; a meet the expert session on paediatric lung function test reference values; and the annual paediatric grand round. In this report the Chairs of the Paediatric Assembly's Groups highlight the key messages from the abstracts presented at the Congress.
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Affiliation(s)
- Jonathan Grigg
- Centre for Child Health, Blizard Institute, Queen Mary University of London, London, UK
| | - Jürg Barben
- Division of Paediatric Pulmonology, Children's Hospitals of Eastern Switzerland, St. Gallen, Switzerland
| | - Kajsa Bohlin
- Division of Pediatrics, Karolinska University Hospital, Stockholm, Sweden
| | - Mark L. Everard
- School of Paediatrics and Child Health, The University of Western Australia, Crawley, Australia
| | | | - Mariëlle Pijnenburg
- Dept of Pediatric Respiratory Medicine, Erasmus MC – Sophia Children's Hospital, Rotterdam, The Netherlands
| | - Kostas N. Priftis
- Children's Respiratory and Allergy Unit, Third Dept of Paediatrics, “Attikon” Hospital, University of Athens Medical School, Athens, Greece
| | | | - Fabio Midulla
- Dipartimento di Pediatria e Neuropsichiatria Infantile, Ospedale Policlinico Umberto I, Rome, Italy
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