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Lo Giudice A, La Rosa S, Ronsivalle V, Isola G, Cicciù M, Alessandri-Bonetti G, Leonardi R. Indications for Dental Specialists for Treating Obstructive Sleep Apnea with Mandibular Advancement Devices: A Narrative Review. Int J Dent 2024; 2024:1007237. [PMID: 38585252 PMCID: PMC10999292 DOI: 10.1155/2024/1007237] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2024] [Revised: 03/20/2024] [Accepted: 03/21/2024] [Indexed: 04/09/2024] Open
Abstract
Obstructive sleep apnea (OSA) syndrome is characterized by repeated airway collapse during sleep. It determines cardiovascular, pulmonary, and neurocognitive consequences and is associated with several daytime and nighttime symptoms that influence the patient's quality of life. The contribution of the dental specialist in the clinical management of OSA patients entails participating in the screening process as diagnostic sentinels and providing adequate treatment using mandibular advancement devices (MADs). Since the treatment of OSA requires a multidisciplinary approach, including different medical specialists, dentists should have a comprehensive understanding of medical and dental factors that influence the strategy and effectiveness of OSA treatment with MAD. Such expertise is crucial in determining the appropriate treatment indications and helps clinicians establish a consolidated position within the multidisciplinary OSA team. In this regard, this review summarizes the evidence of the clinical indications for MAD treatment and provides the dental specialist with helpful information about medical, functional, and other relevant factors that should be considered during diagnosis, treatment plan, and follow-up stages. Information retrieved was organized and discussed, generating specific domains/queries oriented to the clinical management of OSA patients from the clinical perspective of dental specialists.
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Affiliation(s)
- Antonino Lo Giudice
- Department of General Surgery and Medical-Surgical Specialties, Section of Orthodontics, Policlinico Universitario “Gaspare Rodolico—San Marco”, University of Catania, Via Santa Sofia 78, Catania 95123, Italy
| | - Salvatore La Rosa
- Department of General Surgery and Medical-Surgical Specialties, Section of Orthodontics, Policlinico Universitario “Gaspare Rodolico—San Marco”, University of Catania, Via Santa Sofia 78, Catania 95123, Italy
| | - Vincenzo Ronsivalle
- Department of General Surgery and Medical-Surgical Specialties, Section of Oral Surgery, Policlinico Universitario “Gaspare Rodolico—San Marco”, University of Catania, Via Santa Sofia 78, Catania 95123, Italy
| | - Gaetano Isola
- Department of General Surgery and Medical-Surgical Specialties, Section of Periodontology, Policlinico Universitario “Gaspare Rodolico—San Marco”, University of Catania, Via Santa Sofia 78, Catania 95123, Italy
| | - Marco Cicciù
- Department of General Surgery and Medical-Surgical Specialties, Section of Oral Surgery, Policlinico Universitario “Gaspare Rodolico—San Marco”, University of Catania, Via Santa Sofia 78, Catania 95123, Italy
| | - Giulio Alessandri-Bonetti
- Department of Biomedical and Neuromotor Sciences (DIBINEM), Section of Orthodontics, University of Bologna, Bologna, Italy
| | - Rosalia Leonardi
- Department of General Surgery and Medical-Surgical Specialties, Section of Orthodontics, Policlinico Universitario “Gaspare Rodolico—San Marco”, University of Catania, Via Santa Sofia 78, Catania 95123, Italy
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Ozturk B, Koundal S, Al Bizri E, Chen X, Gursky Z, Dai F, Lim A, Heerdt P, Kipnis J, Tannenbaum A, Lee H, Benveniste H. Continuous positive airway pressure increases CSF flow and glymphatic transport. JCI Insight 2023; 8:e170270. [PMID: 37159262 PMCID: PMC10371231 DOI: 10.1172/jci.insight.170270] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2023] [Accepted: 05/04/2023] [Indexed: 05/10/2023] Open
Abstract
Respiration can positively influence cerebrospinal fluid (CSF) flow in the brain, yet its effects on central nervous system (CNS) fluid homeostasis, including waste clearance function via glymphatic and meningeal lymphatic systems, remain unclear. Here, we investigated the effect of supporting respiratory function via continuous positive airway pressure (CPAP) on glymphatic-lymphatic function in spontaneously breathing anesthetized rodents. To do this, we used a systems approach combining engineering, MRI, computational fluid dynamics analysis, and physiological testing. We first designed a nasal CPAP device for use in the rat and demonstrated that it functioned similarly to clinical devices, as evidenced by its ability to open the upper airway, augment end-expiratory lung volume, and improve arterial oxygenation. We further showed that CPAP increased CSF flow speed at the skull base and augmented glymphatic transport regionally. The CPAP-induced augmented CSF flow speed was associated with an increase in intracranial pressure (ICP), including the ICP waveform pulse amplitude. We suggest that the augmented pulse amplitude with CPAP underlies the increase in CSF bulk flow and glymphatic transport. Our results provide insights into the functional crosstalk at the pulmonary-CSF interface and suggest that CPAP might have therapeutic benefit for sustaining glymphatic-lymphatic function.
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Affiliation(s)
- Burhan Ozturk
- Department of Anesthesiology, Yale School of Medicine, New Haven, Connecticut, USA
| | - Sunil Koundal
- Department of Anesthesiology, Yale School of Medicine, New Haven, Connecticut, USA
| | - Ehab Al Bizri
- Department of Anesthesiology, Renaissance School of Medicine, Stony Brook University, Stony Brook, New York, USA
| | - Xinan Chen
- Department of Medical Physics, Memorial Sloan Kettering Cancer Center, New York City, New York, USA
| | - Zachary Gursky
- Department of Anesthesiology, Yale School of Medicine, New Haven, Connecticut, USA
| | - Feng Dai
- Quantitative Data Sciences, Global Product Development Pfizer Inc., Groton, Connecticut, USA
| | - Andrew Lim
- Department of Medicine, University of Toronto, Toronto, Canada
| | - Paul Heerdt
- Department of Anesthesiology, Yale School of Medicine, New Haven, Connecticut, USA
| | - Jonathan Kipnis
- Brain Immunology and Glia (BIG) Center, Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, Missouri, USA
| | - Allen Tannenbaum
- Departments of Computer Science and Applied Mathematics & Statistics, College of Engineering and Applied Sciences, Stony Brook University, Stony Brook, New York, USA
| | - Hedok Lee
- Department of Anesthesiology, Yale School of Medicine, New Haven, Connecticut, USA
| | - Helene Benveniste
- Department of Anesthesiology, Yale School of Medicine, New Haven, Connecticut, USA
- Department of Biomedical Engineering, Yale School of Medicine, New Haven, Connecticut, USA
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Comparison of Expiratory Pressures Generated by Four Different EPAP Devices in a Laboratory Bench Setting. Sleep Med 2022; 96:87-92. [DOI: 10.1016/j.sleep.2022.05.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/27/2022] [Revised: 04/04/2022] [Accepted: 05/09/2022] [Indexed: 11/30/2022]
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Nair GB, Al-Katib S, Podolsky R, Quinn T, Stevens C, Castillo E. Dynamic lung compliance imaging from 4DCT-derived volume change estimation. Phys Med Biol 2021; 66. [PMID: 34560677 DOI: 10.1088/1361-6560/ac29ce] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2021] [Accepted: 09/24/2021] [Indexed: 11/12/2022]
Abstract
Background. Lung compliance (LC) is the ability of the lung to expand with changes in pressure and is one of the earliest physiological measurements to be altered in patients with parenchymal lung disease. Therefore, compliance monitoring could potentially identify patients at risk for disease progression. However, in clinical practice, compliance measurements are prohibitively invasive for use as a routine monitoring tool.Purpose. We propose a novel method for computing dynamic lung compliance imaging (LCI) from non-contrast computed tomography (CT) scans. LCI applies image processing methods to free-breathing 4DCT images, acquired under two different continuous positive airway pressures (CPAP) applied using a full-face mask, in order to compute the lung volume change induced by the pressure change. LCI provides a quantitative volumetric map of lung stiffness.Methods. We compared mean LCI values computed for 10 patients with idiopathic pulmonary fibrosis (IPF) and 7 non-IPF patients who were screened for lung nodules. 4DCTs were acquired for each patient at 5 cm and 10 cm H20 CPAP, as the patients were free breathing at functional residual capacity. LCI was computed from the two 4DCTs. Mean LCI intensities, which represent relative voxel volume change induced by the change in CPAP pressure, were computed.Results.The mean LCI values for patients with IPF ranged between [0.0309, 0.1165], whereas the values ranged between [0.0704, 0.2185] for the lung nodule cohort. Two-sided Wilcoxon rank sum test indicated that the difference in medians is statistically significant (pvalue = 0.009) and that LCI -measured compliance is overall lower in the IPF patient cohort.Conclusion. There is considerable difference in LC scores between patients with IPF compared to controls. Future longitudinal studies should look for LC alterations in areas of lung prior to radiographic detection of fibrosis to further characterize LCI's potential utility as an image marker for disease progression.
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Affiliation(s)
- Girish B Nair
- Division of Pulmonary and Critical Care, Beaumont Health, OUWB School of Medicine, United States of America
| | - Sayf Al-Katib
- Department of Radiology and Molecular Imaging, Beaumont Health, OUWB School of Medicine, United States of America
| | - Robert Podolsky
- Division of Informatics & Biostatistics, Beaumont Research Institute, Beaumont Health, United States of America
| | - Thomas Quinn
- Department of Radiation Oncology, Beaumont Health, OUWB School of Medicine, United States of America
| | - Craig Stevens
- Department of Radiation Oncology, Beaumont Health, OUWB School of Medicine, United States of America
| | - Edward Castillo
- Department of Radiation Oncology, Beaumont Health, OUWB School of Medicine, United States of America.,Department of Biomedical Engineering, The University of Texas at Austin, United States of America
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Xu ZF, Ni X. Debates in pediatric obstructive sleep apnea treatment. World J Otorhinolaryngol Head Neck Surg 2021; 7:194-200. [PMID: 34430827 PMCID: PMC8356119 DOI: 10.1016/j.wjorl.2021.05.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2021] [Revised: 05/05/2021] [Accepted: 05/07/2021] [Indexed: 12/01/2022] Open
Abstract
Pediatric obstructive sleep apnea (OSA) is among the most common sleep-disordered breathing (SDB) diseases in children. Its high prevalence and multiple systemic complications lead to increasing numbers of children and families affected by OSA. Timely diagnosis and effective intervention in children with this condition is extremely important in improving their prognosis. The major approaches in the treatment of OSA in children are to eliminate the causes of upper airway obstruction and prevent and treat complications. Considering the specific individual differences in children's growth and development, as well as the diversity of etiologies in children's OSA, pediatric treatment strategies need to be precise, multidisciplinary, and individualized. First-line clinical treatment consists of surgical (adenotonsillectomy) and non-surgical therapies [including anti-inflammatory medications and non-invasive ventilation (NIV)]. However, a considerable controversy exists concerning the indications, treatment standards, and the evaluation of the efficacy of the aforementioned treatment methods. In this review, reviews and assessment of literature studies and multidisciplinary clinical experience were performed to analyze the application of each treatment and discuss controversial issues and future research directions. We suggest that the above interventions should be tailored to each child's needs, comorbidities, and the availability and expertise of the practitioner. The ideal case is when a multidisciplinary team of doctors together with the patients and their parents, or guardians, have a thorough discussion regarding the benefits and risks of all available treatment options and all agree on an effective treatment plan.
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Affiliation(s)
- Zhi-Fei Xu
- Respiratory Department, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, China
| | - Xin Ni
- Department of Otolaryngology, Head and Neck Surgery, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, China
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Feasibility Assessment of Wearable Respiratory Monitors for Ambulatory Inhalation Topography. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2021; 18:ijerph18062990. [PMID: 33799472 PMCID: PMC8000968 DOI: 10.3390/ijerph18062990] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/26/2021] [Revised: 03/06/2021] [Accepted: 03/11/2021] [Indexed: 11/21/2022]
Abstract
Background: Natural environment inhalation topography provides useful information for toxicant exposure, risk assessment and cardiopulmonary performance. Commercially available wearable respiratory monitors (WRMs), which are currently used to measure a variety of physiological parameters such as heart rate and breathing frequency, can be leveraged to obtain inhalation topography, yet little work has been done. This paper assesses the feasibility of adapting these WRMs for measuring inhalation topography. Methods: Commercially available WRMs were compiled and assessed for the ability to report chest motion, data analysis software features, ambulatory observation capabilities, participant acceptability, purchasing constraints and affordability. Results: The following WRMs were found: LifeShirt, Equivital EQ02 LifeMonitor, Smartex WWS, Hexoskin Smart Garment, Zephyr BioHarness, Nox T3&A1, BioRadio, SleepSense Inductance Band, and ezRIP & zRIP Durabelt. None of the WRMs satisfied all six assessment criteria in a manner enabling them to be used for inhalation topography without modification and development. Conclusions: The results indicate that there are WRMs with core technologies and characteristics that can be built upon for ambulatory inhalation topography measurement in the NE.
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González Mangado N, Egea-Santaolalla CJ, Chiner Vives E, Mediano O. Apnea obstructiva del sueño. OPEN RESPIRATORY ARCHIVES 2020. [DOI: 10.1016/j.opresp.2020.03.008] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
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Lai V, Tong BK, Tran C, Ricciardiello A, Donegan M, Murray NP, Carberry JC, Eckert DJ. Combination therapy with mandibular advancement and expiratory positive airway pressure valves reduces obstructive sleep apnea severity. Sleep 2019; 42:5513371. [DOI: 10.1093/sleep/zsz119] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2018] [Revised: 03/07/2019] [Indexed: 12/21/2022] Open
Abstract
AbstractStudy ObjectivesMandibular advancement splint (MAS) therapy is a well-tolerated alternative to continuous positive airway pressure for obstructive sleep apnea (OSA). Other therapies, including nasal expiratory positive airway pressure (EPAP) valves, can also reduce OSA severity. However, >50% of patients have an incomplete or no therapeutic response with either therapy alone and thus remain at risk of adverse health outcomes. Combining these therapies may yield greater efficacy to provide a therapeutic solution for many incomplete/nonresponders to MAS therapy. Thus, this study evaluated the efficacy of combination therapy with MAS plus EPAP in incomplete/nonresponders to MAS alone.MethodsTwenty-two people with OSA (apnea–hypopnea index [AHI] = 22 [13, 42] events/hr), who were incomplete/nonresponders (residual AHI > 5 events/hr) on an initial split-night polysomnography with a novel MAS device containing an oral airway, completed an additional split-night polysomnography with MAS + oral EPAP valve and MAS + oral and nasal EPAP valves (order randomized).ResultsCompared with MAS alone, MAS + oral EPAP significantly reduced the median total AHI, with further reductions with the MAS + oral/nasal EPAP combination (15 [10, 34] vs. 10 [7, 21] vs. 7 [3, 13] events/hr, p < 0.01). Larger reductions occurred in supine nonrapid eye movement AHI with MAS + oral/nasal EPAP combination therapy (ΔAHI = 23 events/hr, p < 0.01). OSA resolved (AHI < 5 events/hr) with MAS + oral/nasal EPAP in nine individuals and 13 had ≥50% reduction in AHI from no MAS. However, sleep efficiency was lower with MAS + oral/nasal EPAP versus MAS alone or MAS + oral EPAP (78 ± 19 vs. 87 ± 10 and 88 ± 10% respectively, p < 0.05).ConclusionsCombination therapy with a novel MAS device and simple oral or oro-nasal EPAP valves reduces OSA severity to therapeutic levels for a substantial proportion of incomplete/nonresponders to MAS therapy alone.Clinical TrialsName: Targeted combination therapy: Physiological mechanistic studies to inform treatment for obstructive sleep apnea (OSA)URL: https://www.anzctr.org.au/Trial/Registration/TrialReview.aspx?id=372279 Registration: ACTRN12617000492358 (Part C)
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Affiliation(s)
- Victor Lai
- Neuroscience Research Australia (NeuRA), Sydney, NSW, Australia
- School of Medical Sciences, University of New South Wales, Sydney, NSW, Australia
| | - Benjamin K Tong
- Neuroscience Research Australia (NeuRA), Sydney, NSW, Australia
- School of Medical Sciences, University of New South Wales, Sydney, NSW, Australia
| | - Carolin Tran
- Neuroscience Research Australia (NeuRA), Sydney, NSW, Australia
| | | | | | | | - Jayne C Carberry
- Neuroscience Research Australia (NeuRA), Sydney, NSW, Australia
- School of Medical Sciences, University of New South Wales, Sydney, NSW, Australia
- Adelaide Institute for Sleep Health, Flinders University, Adelaide, SA, Australia
| | - Danny J Eckert
- Neuroscience Research Australia (NeuRA), Sydney, NSW, Australia
- School of Medical Sciences, University of New South Wales, Sydney, NSW, Australia
- Adelaide Institute for Sleep Health, Flinders University, Adelaide, SA, Australia
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Zou C, Sheng W, Huai D, Cao J, Su M, Ning D, Xue R, Wang Y, Huang M, Zhang X. Comparison between auto-trilevel and bilevel positive airway pressure ventilation for treatment of patients with concurrent obesity hypoventilation syndrome and obstructive sleep apnea syndrome. Sleep Breath 2018; 23:735-740. [PMID: 30426457 DOI: 10.1007/s11325-018-1750-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2018] [Revised: 10/31/2018] [Accepted: 11/06/2018] [Indexed: 12/19/2022]
Abstract
PURPOSE Our study aims to compare the difference in clinical efficacy between auto-trilevel positive airway pressure (auto-trilevel PAP) ventilator and conventional fixed bilevel positive airway pressure (BiPAP) ventilator for obesity hypoventilation syndrome (OHS) patients with coexisting moderate or severe obstructive sleep apnea hypopnea syndrome (OSAHS). METHODS Twenty-three OHS patients with moderate or severe OSAHS enrolled between January 2015 and September 2017 underwent ventilation by three different modes of positive airway pressure (PAP) for 8 h per night. A single variable mode was applied at the first night followed by two nights when no PAP therapy was carried out as a washout period between each mode. The inspiratory positive airway pressure (IPAP) decided by PaCO2 was consistently used for modes 1, 2, and 3. In mode 1, the expiratory positive airway pressure (EPAP) issued by BiPAP was decided by the minimal PAP levels for cessation of snoring. However, in mode 2, the EPAP was fixed at 3 cmH2O higher than this value. With the use of auto-trilevel PAP in mode 3, the EPAP was set to initially match that of mode 1 but the end of EPAP (EEPAP) was automatically regulated to be elevated according to upper airway patency condition. We also compared the following parameters including apnea hypopnea index (AHI), minimal SpO2 (miniSpO2), arousal index, and sleep efficiency during sleep; PaCO2 in the morning and Epword sleepiness score (ESS) at daytime were measured prior to and during PAP treatment as well as between three selected PAP modes. RESULTS Compared with the parameters before ventilation therapies, all three variable modes of ventilation were associated with a higher nocturnal miniSpO2 and sleep efficiency (all P < 0.01). Among the three variable modes, mode 3 resulted in not only the lowest arousal index and daytime ESS but also the highest sleep efficiency. Compared to mode 1, mode 2 demonstrated a significantly reduced AHI and an elevated miniSpO2 and morning PaCO2 (all P < 0.05), while mode 3 was associated with a decreased AHI, an increased miniSpO2 (all P < 0.05), and no statistical change of PaCO2 following the end of PAP treatment (P > 0.05). Comparison between mode 2 and mode 3 revealed that mode 3 had a significantly lower PaCO2 (P < 0.05), but displayed no remarkable changes of AHI and miniSpO2 (all P > 0.05). CONCLUSION Compared to fixed BiPAP ventilation, auto-trilevel PAP ventilation could more effectively correct hypercapnia, achieve lower index of nocturnal apnea and hypopnea, more improved sleep quality, and lower daytime sleepiness score. Auto-trilevel PAP ventilation is therefore more efficacious than conventional BiPAP ventilation in non-invasive ventilation therapy for OHS patients with concurrent moderate or severe OSAHS.
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Affiliation(s)
- Chunfang Zou
- Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital with Nanjing Medical University, 300 Guangzhou Road, Nanjing, 210029, China
| | - Weiwei Sheng
- Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital with Nanjing Medical University, 300 Guangzhou Road, Nanjing, 210029, China
| | - De Huai
- Department of Otorhinolaryngology, Xuzhou Medical University Affiliated Huai'an Hospital and Huai'an Second People's Hospital, Huai'an, 223002, Jiangsu, China
| | - Juan Cao
- Department of Respirology, Wuxi People's Hospital, 299 Qingyang Road, Wuxi, 214001, Jiangsu, China
| | - Mei Su
- Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital with Nanjing Medical University, 300 Guangzhou Road, Nanjing, 210029, China
| | - Ding Ning
- Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital with Nanjing Medical University, 300 Guangzhou Road, Nanjing, 210029, China
| | - Rong Xue
- Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital with Nanjing Medical University, 300 Guangzhou Road, Nanjing, 210029, China
| | - Yanli Wang
- Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital with Nanjing Medical University, 300 Guangzhou Road, Nanjing, 210029, China
| | - Mao Huang
- Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital with Nanjing Medical University, 300 Guangzhou Road, Nanjing, 210029, China
| | - Xilong Zhang
- Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital with Nanjing Medical University, 300 Guangzhou Road, Nanjing, 210029, China.
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Lorenzi-Filho G, Almeida FR, Strollo PJ. Treating OSA: Current and emerging therapies beyond CPAP. Respirology 2017; 22:1500-1507. [PMID: 28901030 DOI: 10.1111/resp.13144] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2017] [Revised: 07/09/2017] [Accepted: 07/10/2017] [Indexed: 12/20/2022]
Abstract
Continuous positive airway pressure (CPAP) is the standard treatment for moderate-to-severe obstructive sleep apnoea (OSA). However, adherence to CPAP is limited and non-CPAP therapies are frequently explored. Oral appliance (OA) therapy is currently widely used for the treatment of snoring, mild, moderate and severe OSA. The most commonly used and studied OA consists of a maxillary and mandibular splint which hold the lower jaw forward during sleep. The efficacy of OA is inferior to CPAP; however, the effectiveness as measured by sleepiness, quality of life, endothelial function and blood pressure is similar likely due to higher acceptance and subjective adherence. Upper airway stimulation augments neural drive by unilaterally stimulating the hypoglossal nerve. The Stimulation Therapy for Apnea Reduction (STAR) study enrolled 126 patients and demonstrated a 68% reduction in OSA severity. A high upfront cost and variable response are the main limitations. Oropharyngeal exercises consist of a set of isometric and isotonic exercises involving the tongue, soft palate and lateral pharyngeal wall. The collective reported trials (n = 120) showed that oropharyngeal exercises can ameliorate OSA and snoring (~30-40%). Nasal EPAP devices consist of disposable one-way resister valve. A systematic review (n = 345) showed that nasal EPAP reduced OSA severity by 53%. The Winx device consists of a mouthpiece placed inside the oral cavity that is connected by tubing to a console that generates negative pressure. Winx may provide successful therapy for ~30-40% of OSA patients. In conclusion, several non-CPAP therapies to treat OSA are currently available.
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Affiliation(s)
- Geraldo Lorenzi-Filho
- Sleep Laboratory, Pulmonary Division, Heart Institute, Faculty of Medicine, University of São Paulo, São Paulo, Brazil
| | - Fernanda R Almeida
- Faculty of Dentistry, University of British Columbia, Vancouver, BC, Canada
| | - Patrick J Strollo
- Division of Pulmonary, Allergy, and Critical Care Medicine, University of Pittsburgh School of Medicine and Veterans Administration Pittsburgh Health System, Pittsburgh, PA, USA
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11
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Auto-trilevel versus bilevel positive airway pressure ventilation for hypercapnic overlap syndrome patients. Sleep Breath 2017; 22:65-70. [PMID: 28612267 DOI: 10.1007/s11325-017-1529-y] [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: 02/03/2017] [Revised: 06/01/2017] [Accepted: 06/05/2017] [Indexed: 10/19/2022]
Abstract
PURPOSE Although bilevel positive airway pressure (Bilevel PAP) therapy is usually used for overlap syndrome (OS), there is still a portion of OS patients in whom Bilevel PAP therapy could not simultaneously eliminate residual apnea events and hypercapnia. The current study was expected to explore whether auto-trilevel positive airway pressure (auto-trilevel PAP) therapy with auto-adjusting end expiratory positive airway pressure (EEPAP) can serve as a better alternative for these patients. METHODS From January of 2014 to June of 2016, 32 hypercapnic OS patients with stable chronic obstructive pulmonary diseases (COPD) and moderate-to-severe obstructive sleep apnea syndrome (OSAS) were recruited. Three variable modes of positive airway pressure (PAP) from the ventilator (Prisma25ST, Weinmann Inc., Germany) were applicated for 8 h per night. We performed the design of each mode at each night with an interval of two nights with no PAP treatment as a washout period among different modes. In Bilevel-1 mode (Bilevel-1), the expiratory positive airway pressure (EPAP) delivered from Bilevel PAP was always set as the lowest PAP for abolishment of snoring. For each patient, the inspiratory positive airway pressure (IPAP) was constantly set the same as the minimal pressure for keeping end-tidal CO2 (ETCO2) ≤45 mmHg for all three modes. However, the EPAP issued by Bilevel PAP in Bilevel-2 mode (Bilevel-2) was kept 3 cmH2O higher than that in Bilevel-1. In auto-trilevel mode (auto-trilevel) with auto-trilevel PAP, the initial part of EPAP was fixed at the same PAP as that in Bilevel-1 while the EEPAP was automatically regulated to rise at a range of ≤4 cmH2O based on nasal airflow wave changes. Comparisons were made for parameters before and during or following treatment as well as among different PAP therapy modes. The following parameters were compared such as nocturnal apnea hypopnea index (AHI), minimal SpO2 (minSpO2), arousal index, sleep structure and efficiency, morning PaCO2, and daytime Epworth Sleepiness Scale (ESS). RESULTS Compared with the parameters before PAP therapies, during each mode of PAP treatment, significant reduction was detected in nocturnal AHI, arousal index, morning PaCO2, and daytime ESS while significant elevation was revealed in nocturnal minSpO2 and sleep efficiency (all P < 0.01). Comparison among three PAP modes indicated that under the same IPAP, the auto-trilevel PAP mode could result in the lowest arousal index, daytime ESS, and the highest sleep efficiency. Compared with Bilevel-1, it was detected that (a) AHI was lower but minSpO2 was higher in both Bilevel-2 and auto-trilevel (all P < 0.05) and (b) morning PaCO2 showed no statistical difference from that in auto-trilevel but displayed higher in Bilevel-2 (P < 0.05). Compared with Bilevel-2, in auto-trilevel, both AHI and minSpO2 showed no obvious changes (all P > 0.05) except with a lower morning PaCO2 (P < 0.05). CONCLUSION Auto-trilevel PAP therapy was superior over conventional Bilevel PAP therapy for hypercapnic OS patients with their OSAS moderate to severe, since auto-trilevel PAP was more efficacious in synchronous elimination of residual obstructive apnea events and CO2 retention as well as in obtaining a better sleep quality and milder daytime drowsiness.
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Cao MT, Sternbach JM, Guilleminault C. Continuous positive airway pressure therapy in obstuctive sleep apnea: benefits and alternatives. Expert Rev Respir Med 2017; 11:259-272. [PMID: 28287009 DOI: 10.1080/17476348.2017.1305893] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
INTRODUCTION Obstructive sleep apnea (OSA) is a highly prevalent condition affecting persons of all age with an increasing public health burden. It is implicated in cardiovascular disease, metabolic syndrome, neurocognitive impairment, reductions in quality of life, and increased motor vehicle accidents. The goals of OSA treatment are to improve sleep and daytime symptoms, and minimize cardiovascular risks.Areas covered: Continuous positive airway pressure (CPAP) is considered the gold standard therapy that delivers pressurized air into the upper airway to relieve obstruction during sleep. Although CPAP is an effective modality of treatment for OSA, adherence to therapy is highly variable. This article highlights the benefits of CPAP therapy, along with alternative treatment options including oral appliance, implantable and wearable devices, and surgery. Expert commentary: CPAP therapy is the gold standard treatment option and should continue to be offered to those who suffer from OSA. Alternative options are available for those who are unable to adhere to CPAP or choose an alternative treatment modality. The most interesting advances have been incorporating orthodontic procedures in conjunction with myofunctional therapy in prepubertal children, raising the possibility of OSA prevention by initiating treatment early in life.
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Affiliation(s)
- Michelle T Cao
- a Division of Sleep Medicine , Stanford University , Redwood City , CA , USA
| | - Joshua M Sternbach
- a Division of Sleep Medicine , Stanford University , Redwood City , CA , USA
| | - C Guilleminault
- a Division of Sleep Medicine , Stanford University , Redwood City , CA , USA
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Ng DK, Huang YS, Teoh OH, Preutthipan A, Xu ZF, Sugiyama T, Wong KS, Kwok KL, Fung BY, Lee RP, Ng JH, Leung SY, Che DT, Li A, Wong TK, Khosla I, Nathan A, Leopando MT, Al Kindy H. The Asian Paediatric Pulmonology Society (APPS) position statement on childhood obstructive sleep apnea syndrome. ACTA ACUST UNITED AC 2017. [DOI: 10.4103/prcm.prcm_13_17] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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14
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Nandalike K, Arens R. Ventilator Support in Children with Obstructive Sleep Apnea Syndrome. Respir Med 2016. [DOI: 10.1007/978-1-4939-3749-3_13] [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: 11/28/2022]
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15
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Nasal Expiratory Positive Airway Pressure Devices (Provent) for OSA: A Systematic Review and Meta-Analysis. SLEEP DISORDERS 2015; 2015:734798. [PMID: 26798519 PMCID: PMC4699057 DOI: 10.1155/2015/734798] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/20/2015] [Revised: 11/18/2015] [Accepted: 11/19/2015] [Indexed: 12/30/2022]
Abstract
Objective. To quantify the effectiveness of nasal expiratory positive airway pressure (nasal EPAP) devices or Provent as treatment for obstructive sleep apnea (OSA). Methods. PubMed and six other databases were searched through November 15, 2015, without language limitations. Results. Eighteen studies (920 patients) were included. Pre- and post-nasal EPAP means ± standard deviations (M ± SD) for apnea-hypopnea index (AHI) in 345 patients decreased from 27.32 ± 22.24 to 12.78 ± 16.89 events/hr (relative reduction = 53.2%). Random effects modeling mean difference (MD) was −14.78 events/hr [95% CI −19.12, −10.45], p value < 0.00001. Oxygen desaturation index (ODI) in 247 patients decreased from 21.2 ± 19.3 to 12.4 ± 14.1 events/hr (relative reduction = 41.5%, p value < 0.00001). Lowest oxygen saturation (LSAT) M ± SD improved in 146 patients from 83.2 ± 6.8% to 86.2 ± 11.1%, MD 3 oxygen saturation points [95% CI 0.57, 5.63]. Epworth Sleepiness Scale (ESS) M ± SD improved (359 patients) from 9.9 ± 5.3 to 7.4 ± 5.0, MD −2.5 [95% CI −3.2, −1.8], p value < 0.0001. Conclusion. Nasal EPAP (Provent) reduced AHI by 53.2%, ODI by 41.5% and improved LSAT by 3 oxygen saturation points. Generally, there were no clear characteristics (demographic factors, medical history, and/or physical exam finding) that predicted favorable response to these devices. However, limited evidence suggests that high nasal resistance could be associated with treatment failure. Additional studies are needed to identify demographic and polysomnographic characteristics that would predict therapeutic success with nasal EPAP (Provent).
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To KW, Chan TO, Ng S, Ngai J, Hui DSC. Role of nasal positive end expiratory pressure valve as an alternative treatment for obstructive sleep apnoea in Chinese patients. Respirology 2015; 21:541-5. [DOI: 10.1111/resp.12703] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2015] [Revised: 08/18/2015] [Accepted: 09/02/2015] [Indexed: 01/09/2023]
Affiliation(s)
- Kin Wang To
- Division of Respiratory Medicine; Department of Medicine and Therapeutics; Prince of Wales Hospital; The Chinese University of Hong Kong; Shatin Hong Kong
| | - Tat O. Chan
- Division of Respiratory Medicine; Department of Medicine and Therapeutics; Prince of Wales Hospital; The Chinese University of Hong Kong; Shatin Hong Kong
| | - Susana Ng
- Division of Respiratory Medicine; Department of Medicine and Therapeutics; Prince of Wales Hospital; The Chinese University of Hong Kong; Shatin Hong Kong
| | - Jenny Ngai
- Division of Respiratory Medicine; Department of Medicine and Therapeutics; Prince of Wales Hospital; The Chinese University of Hong Kong; Shatin Hong Kong
| | - David SC. Hui
- Division of Respiratory Medicine; Department of Medicine and Therapeutics; Prince of Wales Hospital; The Chinese University of Hong Kong; Shatin Hong Kong
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McLaughlin RA, Noble PB, Sampson DD. Optical coherence tomography in respiratory science and medicine: from airways to alveoli. Physiology (Bethesda) 2015; 29:369-80. [PMID: 25180266 DOI: 10.1152/physiol.00002.2014] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Optical coherence tomography is a rapidly maturing optical imaging technology, enabling study of the in vivo structure of lung tissue at a scale of tens of micrometers. It has been used to assess the layered structure of airway walls, quantify both airway lumen caliber and compliance, and image individual alveoli. This article provides an overview of the technology and reviews its capability to provide new insights into respiratory disease.
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Affiliation(s)
- Robert A McLaughlin
- Optical & Biomedical Engineering Laboratory, School of Electrical, Electronic & Computer Engineering, The University of Western Australia, Perth, Australia;
| | - Peter B Noble
- School of Anatomy, Physiology & Human Biology, and Centre for Neonatal Research & Education, School of Paediatrics and Child Health, The University of Western Australia, Crawley, Australia; and
| | - David D Sampson
- Optical & Biomedical Engineering Laboratory, School of Electrical, Electronic & Computer Engineering, The University of Western Australia, Perth, Australia; Centre for Microscopy, Characterisation & Analysis, The University of Western Australia, Perth, Australia
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Spießhöfer J, Heinrich J, Lehmann R, Efken C, Fox H, Bitter T, Körber B, Horstkotte D, Oldenburg O. Respiratory effects of adaptive servoventilation therapy in patients with heart failure and Cheyne-Stokes respiration compared to healthy volunteers. Respiration 2015; 89:374-82. [PMID: 25871423 DOI: 10.1159/000375312] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2013] [Accepted: 12/30/2014] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Nocturnal adaptive servoventilation (ASV) therapy is now frequently used to treat Cheyne-Stokes respiration (CSR), which is highly prevalent in patients with moderate-to-severe heart failure (HF) and characterized by periodical breathing (hyperventilation). OBJECTIVES This study analyzed and compared the acute effects of a novel ASV device on carbon dioxide pressure (pCO2) and oxygen saturation (SaO2) in HF patients with CSR and healthy volunteers. The influence of being asleep or awake on the ASV algorithm was also determined. METHODS All subjects underwent ASV (PaceWave™, ResMed) for 1 h. Transcutaneous pCO2 (PtcCO2) and SaO2 were assessed transcutaneously, while wakefulness was analyzed using EEG recordings. Assessments were made 30 min before and after ASV, and during 1 h of ASV. RESULTS Twenty HF patients (19 male; age 79 ± 12 years) and 15 volunteers (13 male, age 25 ± 4 years) were included. When awake, ASV was associated with a trend towards a decrease in PtcCO2 and an increase in SaO2 versus baseline in HF patients (34.4 ± 3.2 to 33.7 ± 3.8 mm Hg and 93.8 ± 2.6 to 94.9 ± 2.6%, respectively) and volunteers (39.5 ± 3.0 to 38.2 ± 3.8 mm Hg and 96.9 ± 1.3 to 97.8 ± 0.9%). While asleep during ASV, PtcCO2 increased to 36.3 ± 3.8 mm Hg and SaO2 decreased to 93.8 ± 2.6% in HF patients, with similar changes in volunteers (PtcCO2 41.7 ± 3.0 mm Hg, SaO2 97.1 ± 1.2). All comparisons were statistically significant (p ≤ 0.05, except the PtcCO2 decrease in both groups when awake). CONCLUSIONS ASV therapy might result in hyperventilation when subjects are awake, but while asleep, PtcCO2 increased to mid-normal values, effects that would be favorable in HF patients with CSR.
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Affiliation(s)
- Jens Spießhöfer
- Department of Cardiology, Heart and Diabetes Centre North Rhine-Westphalia, Ruhr University Bochum, Bad Oeynhausen, Germany
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Jen R, Grandner MA, Malhotra A. Future of Sleep-Disordered Breathing Therapy Using a Mechanistic Approach. Can J Cardiol 2015; 31:880-8. [PMID: 26044800 DOI: 10.1016/j.cjca.2015.02.007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2014] [Revised: 01/30/2015] [Accepted: 02/08/2015] [Indexed: 01/10/2023] Open
Abstract
Sleep disordered breathing (SDB) is highly prevalent among patients with cardiovascular disease (CVD), and the relationship between SDB and CVD may be bidirectional. However, SDB remains underdiagnosed and undertreated. One of the major barriers identified by cardiologists is lack of satisfaction with SDB therapy. This situation could be the result of the discordance between treatment and the pathophysiological characteristics of SDB. This condition is caused by multiple pathophysiological mechanisms, which could be classified into upper airway anatomic compromise, pharyngeal dilator muscle dysfunction, and ventilatory control instability. However, the effective treatment of SDB remains limited, and positive airway pressure therapy is still the mainstay of the treatment. Therefore, we review the pathophysiological characteristics of SDB in this article, and we propose to provide individualized treatment of SDB based on the underlying mechanism. This approach requires further study but could potentially improve adherence and success of therapy.
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Affiliation(s)
- Rachel Jen
- Respiratory Division, Department of Medicine, University of British Columbia, Vancouver, British Columbia, Canada; Division of Pulmonary and Critical Care, University of California, San Diego, La Jolla, California, USA
| | - Michael A Grandner
- Division of Sleep Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Atul Malhotra
- Division of Pulmonary and Critical Care, University of California, San Diego, La Jolla, California, USA.
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20
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Sutherland K, Cistulli PA. Recent advances in obstructive sleep apnea pathophysiology and treatment. Sleep Biol Rhythms 2014. [DOI: 10.1111/sbr.12098] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Kate Sutherland
- Department of Respiratory and Sleep Medicine; Center for Sleep Health and Research; Royal North Shore Hospital; University of Sydney; Sydney New South Wales Australia
- Discipline of Sleep Medicine; Sydney Medical School; University of Sydney; Sydney New South Wales Australia
- Woolcock Institute of Medical Research; University of Sydney; Sydney New South Wales Australia
| | - Peter A Cistulli
- Department of Respiratory and Sleep Medicine; Center for Sleep Health and Research; Royal North Shore Hospital; University of Sydney; Sydney New South Wales Australia
- Discipline of Sleep Medicine; Sydney Medical School; University of Sydney; Sydney New South Wales Australia
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21
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Milne S, Amis TC, Wheatley JR, Kairaitis K. Sensitivity and specificity of hypopnoea detection using nasal pressure in the presence of a nasal expiratory resistive device (Provent®). Physiol Meas 2014; 35:2447-58. [PMID: 25389784 DOI: 10.1088/0967-3334/35/12/2447] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Nasal expiratory resistive valves (Provent(®)) have been proposed as novel therapy for obstructive sleep apnea. We compared pressure measurements from a standard nasal pressure catheter used to assess nasal airflow during sleep with those from nasal expiratory resistive device with attached proprietary nasal pressure cannula. Nasal pressure cannula or Provent(®) + proprietary nasal pressure cannula were attached to a bench model of human anterior nares and nasal passages, and pressure measured (P). Respiratory airflows generated by a subject breathing were applied to rear of model and airflow (V) measured via pneumotachograph. Airflow amplitude (ΔV) was plotted against pressure amplitude (ΔP). Hypopnoea detection (<50% ΔV) sensitivity and specificity was tested by expressing ΔP in terms of two reference breaths: reference breath 1, ΔV 0.55 L s(-1) = 100%; and reference breath 2, ΔV 0.45 L s(-1) = 100%. ΔP/ΔV relationships were linear for ΔV ≤ 0.55 L s(-1); ΔP = 0.37ΔV + 0.16 (nasal pressure cannula), ΔP = 2.7ΔV + 0.12 (Provent(®) + proprietary nasal pressure cannula); both R(2) > 0.65, p < 0.0001; p < 0.0001 for between slope difference). For nasal pressure cannula, specificity of hypopnoea detection differed between reference breaths one and two (80.2% and 40.0%, respectively), and Provent(®) + proprietary nasal pressure cannula (30.3% and 74.2%, respectively). Quantification of airflow obstruction in the presence of Provent(®) + proprietary nasal pressure cannula is greatly influenced by the reference breath chosen to determine a reduction in nasal airflow. Reported variability in therapeutic response to nasal expiratory resistive devices may relate to differences in measurement technique specificity used to quantify the severity of sleep disordered breathing.
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Affiliation(s)
- Stephen Milne
- Department of Respiratory and Sleep Medicine at Westmead Hospital, Westmead, Sydney, NSW 2145, Australia
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22
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Wu H, Yuan X, Zhan X, Li L, Wei Y. A review of EPAP nasal device therapy for obstructive sleep apnea syndrome. Sleep Breath 2014; 19:769-74. [DOI: 10.1007/s11325-014-1057-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2014] [Revised: 08/27/2014] [Accepted: 09/03/2014] [Indexed: 12/29/2022]
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Home ventilation therapy in obstructive sleep apnea-hypopnea syndrome. Arch Bronconeumol 2014; 50:528-34. [PMID: 25059585 DOI: 10.1016/j.arbres.2014.06.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2013] [Revised: 06/03/2014] [Accepted: 06/04/2014] [Indexed: 11/24/2022]
Abstract
Obstructive sleep apnea-hypopnea is a highly prevalent disease that is often underdiagnosed at present. It has a significant economic and social welfare impact, accounting for a large part of the resources assigned to home respiratory therapies. As part of the 2014 SEPAR Year of the Chronic Patient and Domiciliary Respiratory Care sponsored by the Spanish Society of Pulmonology and Thoracic Surgery, this article reviews the most recent publications on the indications and controversial issues in the treatment of sleep apnea, the latest evidence for indication of various positive pressure devices, and adjustment modes, ranging from the use of empirical formulae or mathematical estimations to modern auto-CPAP equipment, while not forgetting the gold standard of manual titration. Emphasis is placed on the need for monitoring required by patients to ensure treatment adherence and compliance. Finally, other therapies that are not the object of this article are briefly reviewed.
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Freedman N. Improvements in current treatments and emerging therapies for adult obstructive sleep apnea. F1000PRIME REPORTS 2014; 6:36. [PMID: 24860658 PMCID: PMC4017906 DOI: 10.12703/p6-36] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Obstructive sleep apnea (OSA) is common and is associated with a number of adverse outcomes, including an increased risk for cardiovascular disease. Typical treatment approaches, including positive airway pressure, oral appliances, various upper airway surgeries, and/or weight loss, can improve symptoms and reduce the severity of disease in select patient groups. However, these approaches have several potential limitations, including suboptimal adherence, lack of suitability for all patient groups, and/or absence of adequate outcomes data. Emerging potential therapeutic options, including nasal expiratory positive airway pressure (PAP), oral negative pressure, upper airway muscle stimulation, and bariatric surgery, as well as improvements in existing treatments and the utilization of improving technologies are moving the field forward and should offer effective therapies to a wider group of patients with OSA.
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25
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Owens RL, Edwards BA, Sands SA, Butler JP, Eckert DJ, White DP, Malhotra A, Wellman A. The classical Starling resistor model often does not predict inspiratory airflow patterns in the human upper airway. J Appl Physiol (1985) 2014; 116:1105-12. [PMID: 24458746 PMCID: PMC4035785 DOI: 10.1152/japplphysiol.00853.2013] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2013] [Accepted: 01/16/2014] [Indexed: 12/15/2022] Open
Abstract
The upper airway is often modeled as a classical Starling resistor, featuring a constant inspiratory airflow, or plateau, over a range of downstream pressures. However, airflow tracings from clinical sleep studies often show an initial peak before the plateau. To conform to the Starling model, the initial peak must be of small magnitude or dismissed as a transient. We developed a method to simulate fast or slow inspirations through the human upper airway, to test the hypothesis that this initial peak is a transient. Eight subjects [4 obstructive sleep apnea (OSA), 4 controls] slept in an "iron lung" and wore a nasal mask connected to a continuous/bilevel positive airway pressure machine. Downstream pressure was measured using an epiglottic catheter. During non-rapid eye movement (NREM) sleep, subjects were hyperventilated to produce a central apnea, then extrathoracic pressure was decreased slowly (∼2-4 s) or abruptly (<0.5 s) to lower downstream pressure and create inspiratory airflow. Pressure-flow curves were constructed for flow-limited breaths, and slow vs. fast reductions in downstream pressure were compared. All subjects exhibited an initial peak and then a decrease in flow with more negative pressures, demonstrating negative effort dependence (NED). The rate of change in downstream pressure did not affect the peak to plateau airflow ratio: %NED 22 ± 13% (slow) vs. 20 ± 5% (fast), P = not significant. We conclude that the initial peak in inspiratory airflow is not a transient but rather a distinct mechanical property of the upper airway. In contrast to the classical Starling resistor model, the upper airway exhibits marked NED in some subjects.
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Affiliation(s)
- Robert L Owens
- Sleep Disorders Research Program, Division of Sleep Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts
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Park JG, Morgenthaler TM, Gay PC. Novel and Emerging Nonpositive Airway Pressure Therapies for Sleep Apnea. Chest 2013; 144:1946-1952. [DOI: 10.1378/chest.13-0273] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
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Abstract
OPINION STATEMENT Complex sleep apnea currently refers to the emergence and persistence of central apneas and hypopneas following the application of positive airway pressure therapy in patients with obstructive sleep apnea. However, this narrow definition is an "outcome" and does not capture the spectrum of pathological activation of the respiratory chemoreflex in sleep apnea. The International Classification of Sleep Disorders - 3rd edition recognizes the phenomenon of Treatment-Related Central Sleep Apnea, but the phenotype is usually evident prior to onset of therapy. The key polysomnographic characteristics of chemoreflex modulated and mediated sleep apnea are nonrapid eye movement (NREM) dominance of respiratory events, short (<30 seconds) or long (>60 seconds) cycle time with a self-similar metronomic timing, and spontaneous improvement during rapid eye movement (REM) sleep. Thus, the majority of chemoreflex effects go unrecognized due to the bias toward obstructive sleep apnea's current scoring criteria. Any treatment of apparently obstructive sleep apnea, including surgery and oral appliances, can expose chemoreflex-driven instabilities. As both sleep fragmentation and a narrow CO2 reserve or increased loop gain drive the disease, sedatives (to induce longer periods of stable NREM sleep and reduce the destabilizing effects of arousals in NREM sleep) and CO2-based stabilization approaches are logical. Adaptive ventilation reduces mean hyperventilation yet can induce ventilator-patient desynchrony, while enhanced expiratory rebreathing space (EERS, dead space during positive pressure therapy) and CO2 manipulation directly stabilize respiratory control by moving CO2 above the apnea threshold. Carbonic anhydrase inhibition can provide further adjunctive benefits. Novel pharmacological approaches may target mediators of carotid body hypoxic sensitization, such as the balance between gas neurotransmitters. In complex apnea patients, single mode therapy is unlikely to be successful, and the power of multi-modality therapy should be harnessed for optimal outcomes.
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Rossi VA, Winter B, Rahman NM, Yu LM, Fallon J, Clarenbach CF, Bloch KE, Stradling JR, Kohler M. The effects of Provent on moderate to severe obstructive sleep apnoea during continuous positive airway pressure therapy withdrawal: a randomised controlled trial. Thorax 2013; 68:854-9. [PMID: 23723343 DOI: 10.1136/thoraxjnl-2013-203508] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
OBJECTIVES The aim of this study was to test the effectiveness of Provent, an expiratory nasal resistance valve, to prevent the recurrence of OSA following CPAP withdrawal. DESIGN Randomised, partially blinded, parallel, placebo-controlled trial. SETTING Outpatient sleep clinics in the UK (Oxford) and Switzerland (Zurich). PARTICIPANTS 67 patients with OSA receiving CPAP were randomised to one of three groups for 2 weeks: continuing CPAP, Provent or placebo Provent. MAIN OUTCOME MEASURES Primary outcomes included for Provent versus placebo Provent, OSA severity (oxygen desaturation index (ODI), apnoea-hypopnoea index (AHI)) and Epworth Sleepiness Scale (ESS) score. Secondary outcomes for Provent versus placebo Provent included ODI from ambulatory pulse oximetry and blood pressure (BP). For CPAP versus Provent, or CPAP versus placebo Provent, secondary outcomes included ODI/AHI, ESS and BP. RESULTS 63 patients were included in the per protocol analysis. OSA recurred in the Provent (ODI 35.8, SD 17.4) and placebo Provent (ODI 28.2, SD 18.3) groups, and there was no significant difference in ODI, AHI and ESS between Provent and placebo Provent at 2 weeks (mean difference ODI -1.0, 95% CI -10.0 to +12.0, p=0.85; AHI +3.2, 95% CI -7.7 to +14.1, p=0.52; and ESS -1.4, 95% CI -4.1 to +1.4, p=0.33). ODI from ambulatory pulse-oximetry and BP at 2 weeks were not different in the Provent versus placebo Provent groups. ODI, AHI and BP, but not ESS, were significantly higher in the Provent and placebo Provent groups compared with CPAP. CONCLUSIONS Provent cannot be recommended as an alternative short-term therapy for patients with moderate to severe OSA already on CPAP. TRIALREGNO NCT01332175.
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Affiliation(s)
- Valentina A Rossi
- Sleep Disorders Centre and Pulmonary Division, University Hospital of Zurich, Zurich, Switzerland
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Joosten SA, O'Driscoll DM, Berger PJ, Hamilton GS. Supine position related obstructive sleep apnea in adults: pathogenesis and treatment. Sleep Med Rev 2013; 18:7-17. [PMID: 23669094 DOI: 10.1016/j.smrv.2013.01.005] [Citation(s) in RCA: 140] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2012] [Revised: 01/21/2013] [Accepted: 01/21/2013] [Indexed: 11/26/2022]
Abstract
The most striking feature of obstructive respiratory events is that they are at their most severe and frequent in the supine sleeping position: indeed, more than half of all obstructive sleep apnea (OSA) patients can be classified as supine related OSA. Existing evidence points to supine related OSA being attributable to unfavorable airway geometry, reduced lung volume, and an inability of airway dilator muscles to adequately compensate as the airway collapses. The role of arousal threshold and ventilatory control instability in the supine position has however yet to be defined. Crucially, few physiological studies have examined patients in the lateral and supine positions, so there is little information to elucidate how breathing stability is affected by sleep posture. The mechanisms of supine related OSA can be overcome by the use of continuous positive airway pressure. There are conflicting data on the utility of oral appliances, while the effectiveness of weight loss and nasal expiratory resistance remains unclear. Avoidance of the supine posture is efficacious, but long term compliance data and well powered randomized controlled trials are lacking. The treatment of supine related OSA remains largely ignored in major clinical guidelines. Supine OSA is the dominant phenotype of the OSA syndrome. This review explains why the supine position so favors upper airway collapse and presents the available data on the management of patients with supine related OSA.
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Affiliation(s)
- Simon A Joosten
- Monash Lung and Sleep, Monash Medical Centre, Clayton, Australia; The Ritchie Centre, Monash Institute of Medical Research, Monash University, Clayton, Australia.
| | - Denise M O'Driscoll
- Monash Lung and Sleep, Monash Medical Centre, Clayton, Australia; Department of Medicine, Southern Clinical School, Monash University, Clayton, Australia
| | - Philip J Berger
- The Ritchie Centre, Monash Institute of Medical Research, Monash University, Clayton, Australia
| | - Garun S Hamilton
- Monash Lung and Sleep, Monash Medical Centre, Clayton, Australia; The Ritchie Centre, Monash Institute of Medical Research, Monash University, Clayton, Australia
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Owens RL, Edwards BA, Sands SA, Butler JP, Eckert DJ, White DP, Malhotra A, Wellman A. Upper airway collapsibility and patterns of flow limitation at constant end-expiratory lung volume. J Appl Physiol (1985) 2012; 113:691-9. [PMID: 22628372 DOI: 10.1152/japplphysiol.00091.2012] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The passive pharyngeal critical closing pressure (Pcrit) is measured using a series of pressure drops. However, pressure drops also lower end-expiratory lung volume (EELV), which independently affects Pcrit. We describe a technique to measure Pcrit at a constant EELV. Continuous positive airway pressure (CPAP)-treated obstructive sleep apnea (OSA) patients and controls were instrumented with an epiglottic catheter, magnetometers (to measure change in EELV), and nasal mask/pneumotachograph and slept supine on nasal CPAP. Pcrit was measured in standard fashion and using our novel "biphasic technique" in which expiratory pressure only was lowered for 1 min before the inspiratory pressure was dropped; this allowed EELV to decrease to the drop level before performing the pressure drop. Seven OSA and three controls were studied. The biphasic technique successfully lowered EELV before the inspiratory pressure drop. Pcrit was similar between the standard and biphasic techniques (-0.4 ± 2.6 vs. -0.6 ± 2.3 cmH(2)O, respectively, P = 0.84). Interestingly, we noted three different patterns of flow limitation: 1) classic Starling resistor type: flow fixed and independent of downstream pressure; 2) negative effort dependence within breaths: substantial decrease in flow, sometimes with complete collapse, as downstream pressure decreased; and 3) and negative effort dependence across breaths: progressive reductions in peak flow as respiratory effort on successive breaths increased. Overall, EELV changes do not influence standard passive Pcrit measurements if breaths 3-5 of pressure drops are used. These results also highlight the importance of inspiratory collapse in OSA pathogenesis. The cause of negative effort dependence within and across breaths is not known and requires further study.
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Affiliation(s)
- Robert L Owens
- Sleep Disorders Research Program, Division of Sleep Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts 02115, USA.
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