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Soares D, Sinawe H, Folbe AJ, Yoo G, Badr S, Rowley JA, Lin HS. Lateral oropharyngeal wall and supraglottic airway collapse associated with failure in sleep apnea surgery. Laryngoscope 2012; 122:473-9. [PMID: 22253047 DOI: 10.1002/lary.22474] [Citation(s) in RCA: 89] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2011] [Revised: 10/27/2011] [Accepted: 10/28/2011] [Indexed: 11/10/2022]
Abstract
OBJECTIVES/HYPOTHESIS To identify patterns of airway collapse during preoperative drug-induced sleep endoscopy (DISE) as predictors of surgical failure following multilevel airway surgery for patients with obstructive sleep apnea-hypopnea syndrome (OSAHS). STUDY DESIGN Retrospective clinical chart review. METHODS Medical records of patients who underwent site-specific surgical modification of the upper airway for treatment of OSHAS were reviewed. Patients were included in this study if they had a preoperative airway evaluation with DISE as well as preoperative and postoperative polysomnography. Airway obstruction on DISE was described according to airway level, severity, and axis of collapse. Severe airway obstruction was defined as >75% collapse on endoscopy. Surgical success was described as a postoperative apnea-hypopnea index (AHI) of <20 and a >50% decrease in preoperative AHI. RESULTS A total of 34 patients were included in this study. The overall surgical success rate was 56%. Surgical success (n = 19) and surgical failure (n = 15) patients were similar with regard to age, gender, body mass index, preoperative AHI, Friedman stage, adenotonsillar grades, and surgical management. DISE findings in the surgical failure group demonstrated greater incidence of severe lateral oropharyngeal wall collapse (73.3% vs. 36.8%, P = .037) and severe supraglottic collapse (93.3% vs. 63.2%, P = .046) as compared to the surgical success group. CONCLUSIONS The presence of severe lateral pharyngeal wall and/or supraglottic collapse on preoperative DISE is associated with OSAHS surgical failure. The identification of this failure-prone collapse pattern may be useful in preoperative patient counseling as well as in directing an individualized and customized approach to the treatment of OSHAS.
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Affiliation(s)
- Danny Soares
- Department of Otolaryngology-Head and Neck Surgery, Wayne State University and Karmanos Cancer Institute, Detroit, USA
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302
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Abstract
PURPOSE OF REVIEW Obstructive sleep apnea (OSA) is a common disorder characterized by recurrent pharyngeal collapse secondary to sleep-induced hypotonia of peri-pharyngeal structures. Therapy for OSA is sometimes poorly tolerated and not always effective. The current study reviews a new treatment modality, hypoglossus stimulation, recently evaluated by multiple physiological studies and currently assessed by several clinical studies. RECENT FINDINGS A phase-I, implantable hypoglossus nerve stimulation multicenter study was published in 2001. Significant reduction in apnea-hypopnea index (AHI) was reported in seven of the eight implanted OSA patients, but technical faults precluded prolonged follow-up. Over the past 2 years, three new hypoglossus nerve stimulation systems have been evaluated in more than 60 OSA patients. In adequately selected patients, a more than 50% reduction in AHI was observed. Usually, a decrease in OSA severity from moderate-severe to mild-minimal can be achieved. SUMMARY Ongoing research, including recent initiation of a large multicenter phase-III study, suggests that hypoglossus nerve stimulators are likely to be available as a new treatment modality within a few years. Additional data are needed to define which OSA patients are most likely to benefit from hypoglossus nerve stimulation. Continuous refinement of electrodes design is likely to improve stimulation efficacy in coming years.
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Browaldh N, Friberg D, Svanborg E, Nerfeldt P. 15-year efficacy of uvulopalatopharyngoplasty based on objective and subjective data. Acta Otolaryngol 2011; 131:1303-10. [PMID: 22074106 DOI: 10.3109/00016489.2011.616912] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
CONCLUSIONS This follow-up showed a stable and significant decrease in median oxygen desaturation index 4% (ODI(4)) values over the years. Approximately two-thirds of the patients fulfilled the success criteria (ODI(4) reduction of 50% and <20) after 15 years. A majority had improved/cured excessive daytime sleepiness (EDS) and were satisfied. No increased mortality rate was seen. OBJECTIVES To evaluate sleep apnoea recordings and symptoms in patients with obstructive sleep apnoea syndrome 15 years after uvulopalatopharyngoplasty (UPPP) compared to baseline and previous follow-ups. METHODS This was a non-randomized, prospective intervention study on 50 patients who underwent UPPP during 1985-88. Their initial median age was 49 years (range 38-71) and ODI(4) was 26.5 (4-82). RESULTS In all, 13 patients had died; 26 patients underwent sleep apnoea recordings. Median ODI(4) had decreased from 26.5 (range 4-82) to 8.5 (0-60), p < 0.01, a mean reduction of 52%; 65% of patients achieved the success criteria. One-third was objectively categorized as non-snorers. Median body mass index was unchanged. The questionnaires were answered by 32 of 37 patients; 88% reported improved or cured EDS and 78% were satisfied. Pharyngeal disturbances ratings were low. The standardized mortality rate did not differ from the general Swedish population.
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Affiliation(s)
- Nanna Browaldh
- Department of Otorhinolaryngology, Karolinska University Hospital, Huddinge, Stockholm, Sweden.
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305
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Kline CE, Crowley EP, Ewing GB, Burch JB, Blair SN, Durstine JL, Davis JM, Youngstedt SD. The effect of exercise training on obstructive sleep apnea and sleep quality: a randomized controlled trial. Sleep 2011; 34:1631-40. [PMID: 22131599 PMCID: PMC3208839 DOI: 10.5665/sleep.1422] [Citation(s) in RCA: 215] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
STUDY OBJECTIVES To evaluate the efficacy of a 12-week exercise training program for reducing obstructive sleep apnea (OSA) severity and improving sleep quality, and to explore possible mechanisms by which exercise may reduce OSA severity. DESIGN Randomized controlled trial. SETTING Clinical exercise physiology center, sleep laboratory. PARTICIPANTS Forty-three sedentary and overweight/obese adults aged 18-55 years with at least moderate-severity untreated OSA (screening apnea-hypopnea index [AHI] ≥ 15). INTERVENTIONS Participants randomized to exercise training (n = 27) met 4 times/week for 12 weeks and performed 150 min/week of moderate-intensity aerobic activity, followed by resistance training twice/week. Participants randomized to a stretching control (n = 16) met twice weekly for 12 weeks to perform low-intensity exercises designed to increase whole-body flexibility. MEASUREMENTS AND RESULTS OSA severity was assessed with one night of laboratory polysomnography (PSG) before and following the 12-week intervention. Measures of sleep quality included PSG, actigraphy (7-10 days), and the Pittsburgh Sleep Quality Index. Compared with stretching, exercise resulted in a significant AHI reduction (exercise: 32.2 ± 5.6 to 24.6 ± 4.4, stretching: 24.4 ± 5.6 to 28.9 ± 6.4; P < 0.01) as well as significant changes in oxygen desaturation index (ODI; P = 0.03) and stage N3 sleep (P = 0.03). Reductions in AHI and ODI were achieved without a significant decrease in body weight. Improvements in actigraphic sleep and subjective sleep quality were also noted following exercise compared with stretching. CONCLUSIONS Exercise training had moderate treatment efficacy for the reduction of AHI in sedentary overweight/obese adults, which suggests that exercise may be beneficial for the management of OSA beyond simply facilitating weight loss. TRIAL REGISTRATION Clinicaltrials.gov identification number NCT00956423.
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Affiliation(s)
- Christopher E Kline
- Department of Psychiatry, University of Pittsburgh School of Medicine, Pittsburgh, PA 15213, USA.
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306
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Pachikara N, Mehra R. Treating obstructive sleep apnea with positive pressure therapy. Curr Treat Options Neurol 2011; 13:458-72. [PMID: 21728019 DOI: 10.1007/s11940-011-0134-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
OPINION STATEMENT Obstructive sleep apnea (OSA), a highly prevalent disorder, has historically been under-recognized. As its diagnosis and recognition increases, physicians other than sleep specialists will need to gain familiarity with the management of this disorder, which is so closely tied to increased morbidity, mortality, and an overall health care burden. Most patients with OSA have been managed primarily with positive airway pressure, which is the focus of this review. The technology of positive airway pressure devices has advanced in order to improve adherence. For example, devices are now more compact and lighter in weight, less noisy, have heated humidification capability to diminish nasal dryness and congestion, have an increased variety of mask interfaces, and have modalities to minimize issues of pressure intolerance. In our practice, a multifaceted management model consisting of behavioral modification incorporating weight loss education, sleep hygiene education, and avoidance of exacerbating factors such as alcohol is usually employed in addition to positive airway pressure. A key component to effective treatment is close follow-up with troubleshooting if positive airway pressure adherence issues arise. Observance of early adherence issues is key, so that problems can be addressed sooner and long-term compliance is assured. Also crucial in managing patients with OSA is education regarding potentially improved cardiovascular morbidity and mortality and better quality of life with improved alertness and less drowsy driving. Other therapies specific to OSA, such as oral appliances or upper airway surgery, are discussed as alternatives to positive airway pressure, but these are typically pursued only if the patient has a strong preference or if positive airway pressure therapy is unsuccessful. As current therapies improve and emerging therapies continue to develop into viable treatment strategies, the successful management of OSA will likely demonstrate further progress.
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Affiliation(s)
- Ninon Pachikara
- Division of Pulmonary, Critical Care and Sleep Medicine, Department of Medicine, Case School of Medicine, Case Western Reserve University, 11100 Euclid Ave., Cleveland, OH, 44106, USA
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307
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Affiliation(s)
- Samuel T Kuna
- University of Pennsylvania and the Philadelphia Veterans Affairs Medical Center, Philadelphia, PA 19104, USA.
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308
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Annual review of selected scientific literature: Report of the committee on scientific investigation of the American Academy of Restorative Dentistry. J Prosthet Dent 2011; 106:224-65. [DOI: 10.1016/s0022-3913(11)60127-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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309
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Adverse Outcomes After Maxillomandibular Advancement for Treatment of Obstructive Sleep Apnea. J Oral Maxillofac Surg 2011. [DOI: 10.1016/j.joms.2011.06.058] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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310
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Prinsell JR. Primary and secondary telegnathic maxillomandibular advancement, with or without adjunctive procedures, for obstructive sleep apnea in adults: a literature review and treatment recommendations. J Oral Maxillofac Surg 2011; 70:1659-77. [PMID: 21855196 DOI: 10.1016/j.joms.2011.03.064] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2010] [Revised: 03/04/2011] [Accepted: 03/28/2011] [Indexed: 10/17/2022]
Abstract
PURPOSE To further define the role, surgical principles, and therapeutic efficacy of primary and secondary maxillomandibular advancement (MMA), with and without intrapharyngeal or extrapharyngeal adjunctive procedures, for obstructive sleep apnea in adults. MATERIALS AND METHODS A review of the literature, using mean percent reduction in apnea hypopnea index as the primary outcome measure of therapeutic efficacy for standardized comparison. Other occasionally reported MMA outcome parameters were sleep staging variables, lowest oxyhemoglobin saturation levels, Epworth scores, blood pressure changes, lateral cephalometric data, and complications. RESULTS Mean percent reduction in apnea hypopnea index was 92.1% for primary MMA with extrapharyngeal procedures, 88.4% for primary MMA, 86.6% for secondary MMA, 79.4% for primary MMA with intrapharyngeal procedures, 53.0% for non-MMA multilevel surgery, 31.3% for uvulopalatopharyngoplasty, and 89.8% for nasal continuous positive airway pressure. Treatment recommendations for telegnathic MMA included surgical goals and guidelines, indications and staging protocols, surgical principles and techniques, and postoperative airway management. CONCLUSIONS Primary and secondary MMA are highly therapeutic, and extrapharyngeal are more therapeutic than intrapharyngeal procedures when performed concomitantly with primary MMA. However, long-term success of obstructive sleep apnea treatment should be measured by a yet undefined comprehensive algorithm of standardized multiple weighted outcome parameters.
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311
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Park JG, Ramar K, Olson EJ. Updates on definition, consequences, and management of obstructive sleep apnea. Mayo Clin Proc 2011; 86:549-54; quiz 554-5. [PMID: 21628617 PMCID: PMC3104914 DOI: 10.4065/mcp.2010.0810] [Citation(s) in RCA: 257] [Impact Index Per Article: 19.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Obstructive sleep apnea (OSA) is a breathing disorder during sleep that has implications beyond disrupted sleep. It is increasingly recognized as an independent risk factor for cardiac, neurologic, and perioperative morbidities. Yet this disorder remains undiagnosed in a substantial portion of our population. It is imperative for all physicians to remain vigilant in identifying patients with signs and symptoms consistent with OSA. This review focuses on updates in the areas of terminology and testing, complications of untreated OSA, perioperative considerations, treatment options, and new developments in this field.
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Affiliation(s)
- John G Park
- Division of Pulmonary and Critical Care Medicine, Center for Sleep Medicine, Mayo Clinic, Rochester, MN 55905, USA.
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312
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Margaretten M, Julian L, Katz P, Yelin E. Depression in patients with rheumatoid arthritis: description, causes and mechanisms. ACTA ACUST UNITED AC 2011; 6:617-623. [PMID: 22211138 DOI: 10.2217/ijr.11.6] [Citation(s) in RCA: 89] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Two sets of contributory factors to depression among patients with rheumatoid arthritis (RA) are generally examined - the social context of the individual and the biologic disease state of that person's RA. This article will review the evidence for both. RA affects patients both physically and psychologically. Comorbid depression is common with RA and leads to worse health outcomes. Low socioeconomic status, gender, age, race/ethnicity, functional limitation, pain and poor clinical status have all been linked to depression among persons with RA. Systemic inflammation may also be associated with, cause, or contribute to depression in RA. Understanding the socioeconomic factors, individual patient characteristics and biologic causes of depression in RA can lead to a more comprehensive paradigm for targeting interventions to eliminate depression in RA.
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Affiliation(s)
- Mary Margaretten
- Department of Medicine, University of California, San Francisco, CA, USA
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313
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Choi JH, Kim EJ, Cho WS, Kim YS, Choi J, Kwon SY, Kim TH, Lee HM, Lee SH, Lee SH. Efficacy of Single-Staged Modified Uvulopalatopharyngoplasty with Nasal Surgery in Adults with Obstructive Sleep Apnea Syndrome. Otolaryngol Head Neck Surg 2011; 144:994-9. [DOI: 10.1177/0194599811398194] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Objective. The aim of this study was to investigate the clinical efficacy of single-staged modified uvulopalatopharyngoplasty (UPPP) with nasal surgery and the relationship between its surgical outcomes and an anatomy-based staging system in patients with obstructive sleep apnea syndrome (OSAS) with nasal obstruction. Study Design and Setting. Before–after analysis at a university hospital. Subjects and Methods. A total of 41 consecutive OSAS patients (mean age 40.1 ± 7.3 years) who underwent single-staged modified (uvula-preserving) UPPP with nasal surgery were included. The investigators compared subjective symptoms and polysomnographic data before and after surgery and investigated objective surgical outcomes according to the anatomy-based (Friedman) staging system and postoperative complications. Surgical success was defined as a reduction of at least 50% in preoperative apnea–hypopnea index (AHI) and a postoperative AHI of less than 20 per hour. Results. After simultaneous nasal–oropharyngeal surgery, the AHI significantly decreased (from 45.9 ± 23.4 to 20.9 ± 22.1 events per hour; P < .001) and the overall success rate was 56.1% (23/41). Surgical success rates in stages I, II, and III were 70.6% (12/17), 60.0% (9/15), and 22.2% (2/9), respectively. There were no major complications during or after surgery, and most minor complications were transient and resolved without morbidity. Conclusions. Single-staged modified UPPP with nasal surgery is an available and relatively safe surgical approach in OSAS patients with nasal obstruction. To achieve the best possible surgical outcomes, it is important to select appropriate patients using the anatomy-based staging system.
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Affiliation(s)
- Ji Ho Choi
- Department of Otorhinolaryngology–Head and Neck Surgery, Korea University College of Medicine, Seoul, Korea
| | - Eun Joong Kim
- Department of Otorhinolaryngology–Head and Neck Surgery, Korea University College of Medicine, Seoul, Korea
| | - Woo Sung Cho
- Department of Otorhinolaryngology–Head and Neck Surgery, Bundang Jesaeng Hospital, Seongnam, Korea
| | - Yang Soo Kim
- Department of Otorhinolaryngology–Head and Neck Surgery, Korea University College of Medicine, Seoul, Korea
| | - June Choi
- Department of Otorhinolaryngology–Head and Neck Surgery, Korea University College of Medicine, Seoul, Korea
| | - Soon Young Kwon
- Department of Otorhinolaryngology–Head and Neck Surgery, Korea University College of Medicine, Seoul, Korea
| | - Tae Hoon Kim
- Department of Otorhinolaryngology–Head and Neck Surgery, Korea University College of Medicine, Seoul, Korea
| | - Heung Man Lee
- Department of Otorhinolaryngology–Head and Neck Surgery, Korea University College of Medicine, Seoul, Korea
| | - Sang Hag Lee
- Department of Otorhinolaryngology–Head and Neck Surgery, Korea University College of Medicine, Seoul, Korea
| | - Seung Hoon Lee
- Department of Otorhinolaryngology–Head and Neck Surgery, Korea University College of Medicine, Seoul, Korea
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314
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Kezirian EJ, Weaver EM, Criswell MA, de Vries N, Woodson BT, Piccirillo JF. Reporting results of obstructive sleep apnea syndrome surgery trials. Otolaryngol Head Neck Surg 2011; 144:496-9. [PMID: 21493223 DOI: 10.1177/0194599810396791] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Obstructive sleep apnea syndrome surgery studies largely evaluate single procedures or procedure combinations in case series designs, but it can be difficult to compare results across studies. The authors present a standardized format for presentation of surgical study results to facilitate pooled analyses and subgroup analyses. The format includes thorough characterization of baseline subject characteristics and the use of outcome measures that reflect the spectrum of obstructive sleep apnea and its consequences. As the apnea-hypopnea index is the most common, albeit controversial, primary outcome measure in obstructive sleep apnea syndrome surgery studies, the authors propose analysis and reporting standards to facilitate understanding its role as an outcome measure. Because surgical outcomes vary according to subject characteristics, investigators should also evaluate the potential association between baseline subject characteristics and outcomes.
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Affiliation(s)
- Eric J Kezirian
- Department of Otolaryngology-Head and Neck Surgery, University of California, San Francisco, San Francisco, California 94115, USA.
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315
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Aurora RN, Casey KR, Kristo D, Auerbach S, Bista SR, Chowdhuri S, Karippot A, Lamm C, Ramar K, Zak R, Morgenthaler TI. Practice parameters for the surgical modifications of the upper airway for obstructive sleep apnea in adults. Sleep 2010; 33:1408-13. [PMID: 21061864 DOI: 10.1093/sleep/33.10.1408] [Citation(s) in RCA: 194] [Impact Index Per Article: 13.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND Practice parameters for the treatment of obstructive sleep apnea syndrome (OSAS) in adults by surgical modification of the upper airway were first published in 1996 by the American Academy of Sleep Medicine (formerly ASDA). The following practice parameters update the previous practice parameters. These recommendations were reviewed and approved by the Board of Directors of the American Academy of Sleep Medicine. METHODS A systematic review of the literature was performed, and the GRADE system was used to assess the quality of evidence. The findings from this evaluation are provided in the accompanying review paper, and the subsequent recommendations have been developed from this review. The following procedures have been included: tracheostomy, maxillo-mandibular advancement (MMA), laser assisted uvulopalatoplasty (LAUP), uvulopalatopharyngoplasty (UPPP), radiofrequency ablation (RFA), and palatal implants. RECOMMENDATIONS The presence and severity of obstructive sleep apnea must be determined before initiating surgical therapy (Standard). The patient should be advised about potential surgical success rates and complications, the availability of alternative treatment options such as nasal positive airway pressure and oral appliances, and the levels of effectiveness and success rates of these alternative treatments (Standard). The desired outcomes of treatment include resolution of the clinical signs and symptoms of obstructive sleep apnea and the normalization of sleep quality, the apnea-hypopnea index, and oxyhemoglobin saturation levels (Standard). Tracheostomy has been shown to be an effective single intervention to treat obstructive sleep apnea. This operation should be considered only when other options do not exist, have failed, are refused, or when this operation is deemed necessary by clinical urgency (Option). MMA is indicated for surgical treatment of severe OSA in patients who cannot tolerate or who are unwilling to adhere to positive airway pressure therapy, or in whom oral appliances, which are more often appropriate in mild and moderate OSA patients, have been considered and found ineffective or undesirable (Option). UPPP as a sole procedure, with or without tonsillectomy, does not reliably normalize the AHI when treating moderate to severe obstructive sleep apnea syndrome. Therefore, patients with severe OSA should initially be offered positive airway pressure therapy, while those with moderate OSA should initially be offered either PAP therapy or oral appliances (Option). Use of multi-level or stepwise surgery (MLS), as a combined procedure or as stepwise multiple operations, is acceptable in patients with narrowing of multiple sites in the upper airway, particularly if they have failed UPPP as a sole treatment (Option). LAUP is not routinely recommended as a treatment for obstructive sleep apnea syndrome (Standard). RFA can be considered as a treatment in patients with mild to moderate obstructive sleep apnea who cannot tolerate or who are unwilling to adhere to positive airway pressure therapy, or in whom oral appliances have been considered and found ineffective or undesirable (Option). Palatal implants may be effective in some patients with mild obstructive sleep apnea who cannot tolerate or who are unwilling to adhere to positive airway pressure therapy, or in whom oral appliances have been considered and found ineffective or undesirable (Option). Postoperatively, after an appropriate period of healing, patients should undergo follow-up evaluation including an objective measure of the presence and severity of sleep-disordered breathing and oxygen saturation, as well as clinical assessment for residual symptoms. Additionally, patients should be followed over time to detect the recurrence of disease (Standard). CONCLUSIONS While there has been significant progress made in surgical techniques for the treatment of OSA, there is a lack of rigorous data evaluating surgical modifications of the upper airway. Systematic and methodical investigations are needed to improve the quality of evidence, assess additional outcome measures, determine which populations are most likely to benefit from a particular procedure or procedures, and optimize perioperative care.
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