ORIGINAL ARTICLE. Hsueh-Yu Li, MD; Ning-Hung Chen, MD; Yu-Hsiang Shu, MSc; Pa-Chun Wang, MD, MSc
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1 ORIGINAL ARTICLE Changes in Quality of Life and Respiratory Disturbance After Extended Uvulopalatal Flap Surgery in Patients With Obstructive Sleep Apnea Hsueh-Yu Li, MD; Ning-Hung Chen, MD; Yu-Hsiang Shu, MSc; Pa-Chun Wang, MD, MSc Objective: To evaluate the subjective and objective outcomes of extended uvulopalatal flap (EUPF) surgery in patients with obstructive sleep apnea. Design: Medical Outcomes Study 36-Item Short-Form Health Survey (SF-36), Snore Outcomes Survey (SOS), Epworth Sleepiness Scale (ESS), and polysomnography were performedpreoperativelyandthen6monthspostoperatively. Setting: Tertiary care, sleep disorders referral center. Patients: Fifty-five consecutive patients (52 men and 3 women; mean age, 45 years) with obstructive sleep apnea. Intervention: EUPF surgery. Main Outcome Measures: Overnight polysomnography variables included respiratory distress index (RDI), snore index, minimum oxygen saturation, sleep stages 1 and 2, sleep stages 3 and 4, rapid eye movement, and sleep efficiency. Questionnaire variables included SF- 36, SOS, and ESS scores. Success of the operation was defined as a more than 50% reduction of the RDI from the initial value and a postoperative RDI of less than 20. Results: The overall success rate of the EUPF surgery was 82%; the RDI, snore index, and minimum oxygen saturation improved significantly after surgery (P.001). Sleep architecture in overnight polysomnography remained unchanged (P=.48 and P=.74). Patients demonstrated significant improvement in both their SOS and ESS scores (P.001) and significant increases in 7 of 8 SF-36 subscales (P.05 for all). However, there was poor correlation between the improvement in quality of life and the reduction in sleep-related respiratory events. Conclusions: Extended uvulopalatal flap surgery can greatly reduce sleep-related adverse events and proves to be an effective therapy to enhance the quality of life of patients with obstructive sleep apnea. This study also suggests that subjective and objective outcomes are equally important when reporting the results of EUPF surgery. Arch Otolaryngol Head Neck Surg. 2004;130: From the Departments of Otolaryngology (Dr Li) and Pulmonary and Critical Care Medicine (Dr Chen), Sleep Center, Chang Gung Memorial Hospital, Taipei, Graduate Institute of Epidemiology, College of Public Health, National Taiwan University, Taipei (Mr Shu), and Department of Otolaryngology, Cathay General Hospital, Taipei, and Department of Public Health, China Medical University, Taichung (Dr Wang), Taiwan. The authors have no relevant financial interest in this article. UVULOPALATOPHARYNGOplasty (UPPP), introduced by Fujita and associates, 1 was the first surgical technique specially designed forsleepapneaandisstillthemostfrequently performed surgery for the management of snoring and obstructive sleep apnea (OSA). Although the clinical symptoms have shown great improvement, 2 the response rate concerning apnea and hypopnea is reportedly lessthan50%. 3 Toimprovetheresponserate, a modified technique, extended uvulopalatal flap (EUPF) surgery, was devised. 4 This procedureaimstoremoveadiposetissue, soft palatal glands, and the tonsils to expand the retropalatal space while preserving the muscles, thereby also decreasing the incidence of velopharyngeal insufficiency. Assessment of the success rate in the surgical treatment of OSA depends on overnight polysomnography (PSG) to evaluate the sleep respiratory disturbance indices before and after the operation. Some studies used questionnaires to evaluate the subjective changes in the patients perception of snoring, daytime sleepiness, and quality of life after surgery. 5,6 The improvement of these objective and subjective variables was not identical. 7 To our knowledge, there has been no prospective evaluation of a new palatal surgery for OSA with both objective PSG and subjective questionnaires included in the investigation. In this study, we used both generic and sleep-specific outcome evaluations to investigate the health status changes following EUPF operation. The association between the reduction of sleep-related adverse events and the improvement of quality of life was also explored. 195
2 using mattress sutures with maximal lateralization (Figure, D). Nasal surgery was performed simultaneously to correct septal deviation in 12 patients. SLEEP STUDY Surgical technique of the extended uvulopalatal flap procedure. Reprinted from Am J Otolaryngol. 4 Copyright 2003, with permission from Elsevier. METHODS STUDY POPULATION A total of 55 patients (52 men and 3 women; mean age, 45 years; age range, years) underwent EUPF surgery for OSA between January 1, 2001, and June 30, 2001, at the Department of Otolaryngology and Sleep Center, Chang Gung Memorial Hospital, Taipei, Taiwan. All patients underwent an upper airway examination by an otolaryngologist (nasofibroscopy with the Müller maneuver and 3-dimensional computed tomography 8 ) and were judged to have a narrowed retropalatal space. All patients had been referred from different clinics in Taiwan because of habitual snoring, excessive daytime sleepiness, and other symptoms of OSA. SURGICAL TECHNIQUE The EUPF operation was performed with the patient under general anesthesia. Bilateral tonsillectomy was performed initially. Bilaterally, a triangular incision (1 cm) from the upper pole of tonsillar fossa toward the third maxillary molar was made to remove the mucosa and submucosal adipose tissue. A larger tonsillar fossa was then created with increased superior and lateral dimensions (Figure, A). Following this procedure, the mucosal web between the uvula and the posterior tonsillar pillar was divided (0.5 cm) in an oblique direction along the uvula. The uvula and soft palate were retracted toward the junction of the soft and hard palate to determine a point in the midline approximately 5 to 10 mm below the posterior end of the hard palate. A V-shaped incision was made from this landmark to the upper poles of the bilateral tonsillar fossae. Left-angled scissors were then used to dissect the plane between submucosal adipose tissue and muscle layer along the incision line toward the tip of the uvula (fat stripping technique) (Figure, B). The uvular mucosa was divided along the uvular edge, and the tip was excised with the specimen. The denuded uvula and soft palate now comprised the EUPF. This flap was imbricated and sutured to the residual mucosa of the soft palate using 2-0 Vicryl (Ethicon Inc, Somerville, NJ). The new tonsillar fossa was closed to decrease the dead space (Figure, C). The approximation of anterior and posterior tonsillar pillars was performed Overnight PSG (UltraSom System; Nicolet, Madison, Wis) was performed in the usual manner to document the sleep variables and architecture in each patient. These measures included respiratory disturbance index (RDI), snore index (SI), and minimum oxygen saturation (MSAT). The RDI was defined as the number of total apnea and hypopnea episodes per hour of sleep. An apnea episode was defined as cessation of airflow that lasted longer than 10 seconds, whereas a hypopnea episode was defined as a 50% or greater reduction in combined oral and nasal flow that lasted longer than 10 seconds. The SI was defined as the number of spikes in sound intensity per hour of sleep. The MSAT was defined as the minimal oxygen saturation detected during the sleep test period. The sleep architecture was analyzed using the sleep stages (stages 1 and 2, stages 3 and 4, and rapid eye movement [REM] stage), which were scored according to the international criteria of Rechtschaffen and Kales. 9 Sleep efficiency referred to the ratio of total sleep time to time in bed. SURVEY FORMS All patients completed questionnaires, including the Medical Outcomes Study 36-Item Short-Form Health Survey (SF-36), the Snore Outcomes Survey (SOS), and the Epworth Sleepiness Scale (ESS) at baseline and then 6 months after surgery. Data were retrospectively reviewed. The SF-36 is a widely used, generic quality-of-life measurement that divides general health into 8 domains, including physical functioning (PF), role physical (RP), bodily pain (BP), general health (GH), vitality (VT), social functioning (SF), role emotional (RE), and mental health (MH). 10 These SF-36 subscales and their definitions are as follows: PF, limitation on physical activities, such as walking, bathing, and strenuous sports; RP, problems with work or other daily activities as a result of physical health; BP, intensity of bodily pain or limitation due to pain; GH, perception of current health and health outlook; VT, level of energy; SF, extent health interferes with normal social activities; RE, problems with daily activities as a result of emotional issues; and MH, mental health screening. Each subscore is based on a scale of 0 to 100, with 100 as the optimal health score. A Chinese (Taiwan) version of the SF-36 was used with permission in this study. 11 The SOS contained 8 Likert-type items that evaluated the duration, severity, frequency, and consequences of problems associated with sleep-disordered breathing (SDB), in particular snoring. 12 Because of the impact of SDB on others, a separate Spouse/Bed Partner Survey (SBPS) containing 3 Likerttype items was also developed as an adjunct to the SOS. Scores on the SOS and SBPS are normalized on a scale ranging from 0 (worst) to 100 (best). A Mandarin Chinese version of the SOS was used with permission in this study. 13 The 8-item ESS evaluated daytime somnolence in 8 specific situations and generated a total score ranging from 0 (best) to 24 (worst). 14 A Mandarin Chinese version of the ESS was used with permission in this study. 15 STATISTICAL ANALYSIS Results are expressed as mean±sd. A paired t test was used to compare preoperative and postoperative scores in the PSG sleep variables, sleep architecture, SF-36 subscales, SOS, and ESS. P.05 was considered statistically significant. The t test was 196
3 Table 1. Preoperative and Postoperative Polysomnographic Sleep Variables and Sleep Structure in 55 Patients* Variable Preoperative Postoperative Change P Value Polysomnogram measures Respiratory distress index 43.6 ± ± ± Snore index ± ± ± Minimum oxygen saturation, % 78.9 ± ± ± Sleep structure, % Stages 1 and ± ± ± Stages 3 and ± ± ± Rapid eye movement 10.7 ± ± ± Sleep efficiency 73.4 ± ± ± *Data are given as mean ± SD unless otherwise noted. t Test. applied to compare the SF-36 subscale scores of OSA patients with 2164 age- and sex-matched controls who represented the Taiwanese population norm. 16 The Spearman correlation coefficient was used to assess the associations among the changes of the PSG sleep variables, sleep architecture, and quality-of-life outcomes. Patients were categorized into mild (RDI 15), moderate (15 RDI 30), moderate-severe (30 RDI 60), and severe (RDI 60) SDB groups. One-way analysis of variance (ANOVA) was used to evaluate the effects of disease severity on the results of the objective and subjective examinations. Success of operation was defined as a more than 50% reduction of the RDI from the initial value and a postoperative RDI of less than 20. Using the PSG sleep variables, sleep stages, and survey scores as dependent variables, stepwise multiple regression analyses were applied to investigate the effects of patient demographics, SDB severity, and systemic comorbidity on the objective and subjective sleep-specific outcomes. All data were stored in a Microsoft Access version 7.0 database (Microsoft Inc, Redmond, Wash). Analyses were conducted using the SAS statistical software package (SAS Institute Inc, Cary, NC). RESULTS STUDY POPULATION The participants were 52 men and 3 women (mean age, 45.1±9.7 years). The mean RDI was 43.6±29.7. The mean SI was 208.7±129.3, and the MSAT during sleep was 78.9% ±9.8%. The distribution of the severity of SDB was as follows: mild, 11 (20%); moderate, 15 (27%); moderatesevere, 11 (20%); and severe, 18 (33%). The mean body mass index (BMI), a measure of weight in kilograms divided by the square of height in meters, was 26.4±4.1 before surgery and 25.8±5.1 after surgery. The change in BMI was insignificant (P=.47). PSG SLEEP VARIABLES Before surgery, the mean RDI was 43.6±29.7, the mean SI was 208.7±129.3, and the MSAT during sleep was 78.9% ±9.8%. The postoperative PSG sleep variables and their changes are given in Table 1. The degrees of improvement were 72.2% for RDI (P.001), 48.6% for SI (P.001), and 7.5% for MSAT (P.001). All reached statistically significant levels. Table 2. Medical Outcomes Study 36-Item Short-Form Health Survey (SF-36) Subscale Scores in 55 Patients* SF-36 Subscale Normal Preoperative Postoperative Change Physical 91.5 ± ± ± ± 16.3 functioning Role physical 87.9 ± ± ± ± 43.1 Bodily pain 80.8 ± ± ± ± 15.6 Vitality 71.7 ± ± ± ± 16.5 Role emotional 87.6 ± ± ± ± 44.3 Social 88.3 ± ± ± ± 19.1 functioning General health 73.6 ± ± ± ± 18.8# Mental health 74.7 ± ± ± ± 16.2 *Data are given as mean ± SD. P.01, t test, significantly different compared with the Taiwanese population norm. P.001, t test, significantly different compared with the Taiwanese population norm. P.0001, t test, significant differences between preoperative and postoperative SF-36 subscale scores. P.05, t test, significantly different compared with the Taiwanese population norm. P.001, t test, significant differences between preoperative and postoperative SF-36 subscale scores. #P.01, t test, significant differences between preoperative and postoperative SF-36 subscale scores. A total of 44 of 55 patients met the predefined success criteria. The success rate for this cohort was 80% in general. The success rates for mild, moderate, moderatesevere, and severe SDB groups were 73% (8/11), 80% (12/ 15), 91% (10/11), and 78% (14/18), respectively. SLEEP ARCHITECTURE The sleep architecture remained unchanged following surgery (Table 1). The variations of stages 1 and 2 (P=.48), stages 3 and 4 (P=.74), REM stage (P=.84), and sleep efficiency (P=.13) were all statistically insignificant. GENERAL HEALTH STATUS Except for BP, 7 of 8 of the SF-36 subscale scores from the OSA patients were significantly worse than the subjects representing the Taiwanese population norm (P.01 for all). After EUPF surgery, the study patients performed equivalently (P.05) with the normative data in the RP, BP, VT, RE, SF, and GH domains (Table 2). 197
4 Table 3. Preoperative and Postoperative SOS, SBPS, and ESS Scores in 55 Patients* Measure Preoperative Postoperative Change SOS 36.0 ± ± ± 15.9 SBPS 32.8 ± ± ± 20.7 ESS 11.8 ± ± ± 4.6 Abbreviations: ESS, Epworth Sleepiness Scale; SBPS, Spouse/Bed Partner Survey; SOS, Snore Outcomes Survey. *Data are given as mean ± SD. P.001, t test, significant difference between preoperative and postoperative scores. Table 4. Spearman Correlations Between the Changes of Polysomnographic Sleep Variables and Changes of Health Status in the Patients Measure Change of Polysomnographic Sleep Variables, (P Value) Respiratory Distress Index Snore Index Minimum Oxygen Saturation SF-36 subscale Physical functioning 0.05 (.69) 0.09 (.52) 0.04 (.78) Role physical 0.18 (.17) 0.11 (.44) 0.15 (.28) Bodily pain 0.13 (.37) 0.02 (.90) 0.01 (.94) Vitality 0.13 (.34) 0.13 (.34) 0.11 (.45) Role emotional 0.05 (.71) 0.03 (.82) 0.16 (.24) Social functioning 0.13 (.32) 0.11 (.42) 0.08 (.54) General health 0.04 (.78) 0.11 (.42) 0.06 (.67) Mental health 0.20 (.14) 0.13 (.37) 0.16 (.27) Change of SOS score 0.16 (.24) 0.13 (.32) 0.13 (.34) Change of SPBS score 0.18 (.19) 0.11 (.42) 0.19 (.17) Change of ESS score (.98) 0.15 (.27) 0.02 (.88) Abbreviations: ESS, Epworth Sleepiness Scale; SBPS, Spouse/Bed Partner Survey; SF-36, Medical Outcomes Study 36-Item Short-Form Health Survey; SOS, Snore Outcomes Survey. Table 5. Spearman Correlations Between the Changes of Sleep-Related Outcomes and the Changes of General Health Status in 55 Patients Change of Sleep-Related Outcomes, (P Value) SF-36 Subscale SOS SBPS ESS Physical functioning 0.12 (.41) 0.00 (.97) 0.35 (.01) Role physical 0.21 (.11) 0.07 (.62) 0.08 (.59) Bodily pain 0.05 (.72) 0.00 (.98) 0.00 (.98) Vitality 0.09 (.51) 0.26 (.07) 0.11 (.45) Role emotional 0.21 (.14) 0.03 (.82) 0.40 (.004) Social functioning 0.01 (.97) 0.17 (.25) 0.23 (.10) General health 0.00 (.99) 0.15 (.29) 0.44 (.002) Mental health 0.09 (.14) 0.32 (.03) 0.13 (.35) Abbreviations: ESS, Epworth Sleepiness Scale; SBPS, Spouse/Bed Partner Survey; SF-36, Medical Outcomes Study 36-Item Short-Form Health Survey; SOS, Snore Outcomes Survey. Overall, 7 of 8 of the SF-36 subscale scores significantly improved (P.03 for all) following surgery. Compared with the preoperative general health status, the degrees of quality-of-life improvement were as follows: RP, 83.1%; BP, 6.2%; VT, 26.5%; RE, 86.3%; SF, 14.2%; GH, 11.9%; and MH, 13.9%. The score of PF was the only SF-36 domain that became worse ( 9.6, 11.4% decrease, P.001) after surgery (Table 2). SLEEP-SPECIFIC QUALITY OF LIFE Both the SOS and SBPS scores improved significantly (P.001) following EUPF surgery (Table 3). Compared with the preoperative snore-related health status, the degrees of quality-of-life improvement were 107.8% for SOS and 131.7% for SBPS. The ESS also showed a significant improvement (P.001) following surgery (Table 3). Compared with the preoperative level of daytime somnolence, the degree of reduction in sleepiness was 33.9%. CORRELATIONS, TRENDS, AND OUTCOME PREDICTORS Correlations Between Objective and Subjective Outcomes There were poor associations between the changes of PSG sleep variables with the changes of both general and sleepspecific quality-of-life evaluations (Table 4). None of the quality-of-life measurements significantly correlated with the improvement of RDI, SI, or MSAT (Spearman correlation, P.05). Correlations Between General and Sleep-Specific Health Status There were poor associations (Spearman correlation, P.05) between the changes of the SOS and SBPS with the changes of SF-36 subscale scores. The change of ESS correlated well with the changes of the SF-36 subscales PF (Spearman correlation = 0.35, P=.01), RE (Spearman correlation = 0.4, P=.004), and GH (Spearman correlation = 0.44, P=.002) (Table 5). Effect of Disease Severity on Subjective Outcomes There was no trend noted in the changes of SOS, SBPS, or ESS scores (1-way ANOVA, P.05). A trend was noted in the changes of SF-36 subscales PF (P=.005), MH (P=.02), and VT (P=.01) scores using the 1-way ANOVA test; patients with more severe sleep apnea tended to have greater changes in these subscale scores. Predictor Analysis Stepwise multiple regression models, using change of outcomes as dependent variables, revealed that preoperative BMI was a predictor of the changes of MSAT (R 2 =0.23, P =.05) and sleep efficiency (R 2 =0.28, P =.04). BMI changes were predictive of the change in sleep stages 1 and2(r 2 =0.58, P=.03), whereas age was found to be predictive of the change in sleep stages 3 and 4 (R 2 =0.12, P=.02). The analysis of the predictability of subjective outcomes showed that the severity of OSA was predic- 198
5 tive of the changes of MH (R 2 =0.26, P.001) and VT (R 2 =0.13, P=.03). COMMENT This study showed that the modified UPPP procedure, the EUPF, has a significant effect on the objective measures of sleep-related adverse breathing events and results in a significant subjective improvement in the patient s quality of life. Extended uvulopalatal flap is different from traditional UPPP in 3 aspects: fat stripping with preservation of muscle, expansion of retropalatal space in both the anteroposterior and lateral dimensions, and imbrication instead of excision. The fat stripping technique is based on the hypothesis that the deposits of fat around the upper airway could narrow this space and predispose the airway to collapse when the muscle tone in this area is reduced during sleep. 17 In a previous study, it was shown that the narrowing of the lateral dimension of the retropalatal space in overweight patients with OSA was significantly correlated to their sleep respiratory disturbances. 18 The expansion of the supratonsillar fossa contributed to the increase of the retropalatal space in the lateral dimension. The imbrication and repositioning of the EUPF raised the inferior margin of the soft palate. Hence, the RP was further augmented in the anteroposterior dimension. The EUPF procedure also decreased the chances of scarring at the area proximal to the resected soft palate, an occurrence commonly seen in traditional UPPP. A preliminary evaluation of EUPF surgery revealed a significant decrease of the mean RDI from 41.6±28.2 to 12.5±18.1 (P.001) in 33 consecutive patients with OSA. 4 In another study, 3-dimensional computed tomography was used to assist patient selection and evaluate the changes in the anatomic structure of the upper airway. The results showed a significant widening of the retropalatal space after EUPF surgery (38.2±40.3 vs 71±45.8 mm 2, P.001) and an 84% success rate. 8 In this study, the mean RDI decreased from 43.6±29.7 to 12.1±19.1, showing a reduction rate of 72.2%. The success rate (80%) based on this reduction of RDI showed that EUPF was a highly efficacious procedure in treating OSA. These results are obviously superior to those of UPPP in the treatment of OSA. 3 The mean SI decreased from 208.7±129.3 to 107.4±119.7 (48.6% reduction). The improvement of MSAT was mild but critical, because the episodic decrease of the sleep oxygen saturation level is closely associated with the increased incidence of cardiovascular disease. 19 Our data also showed that some patients characteristics, such as age and BMI, had minor effects on the objective surgical outcomes. The ESS, developed by Johns, 14 has been recognized as a valid measure of sleep propensity. The Chinese version of the ESS was found to have satisfactory reliability and validity. 15 In this series, ESS scores of patients returned to normal levels following surgery (from 11.8 to 7.5). The symptom of excessive daytime sleepiness often has a restraining influence on many social and work-related situations and probably diminishes the quality of life of the patient. 20 The correlations between the changes of ESS and some SF-36 subscale scores and the insignificant correlation between SOS and SF-36 (r= 0.003, P=.98) attest the published hypothesis that shows that sleepiness, rather than snoring, is a more important general health determinant. 21 Our data demonstrate that EUPF surgery can significantly improve the general health status of patients in multiple dimensions on the SF-36 questionnaire, especially for those variables involving activities of daily living. The degrees of improvement for both RP and RE exceeded 80%. The elevation of the energy level (14.4 points or a 26.5% increase in VT score) was a presumed consequence of the reduction in daytime somnolence (ESS score decreased from 11.8 to 7.5) even though their degrees of improvement varied. The scores of RP, RE, SF, VT, and GH returned to normal levels following surgery. This not only reflected the effectiveness of EUPF surgery but also substantiated the observation that SDB indeed incurs some general health burdens. The reason why the patients scored worse in the PF subscale postoperatively is unknown. Although a few patients complained of the sensation of having a lump in the throat (7%, 4/55) and mild nasal regurgitation (6%, 3/55), none of them complained about any physical limitation in their daily activities. Furthermore, none of them had any cardiopulmonary problems after EUPF surgery. Longer follow-up and more objective data need to be gathered to explain this phenomenon. The SOS is a valid, reliable, and disease-specific outcome measure for SDB treatment. 12 It is usually the sleeping partner s perception of the snoring that motivates the patient to seek treatment, so this study included the subjective SBPS questionnaire. The increase of 107.8% in SOS scores reflected the significant improvement in the duration, loudness, and frequency of the patients snoring. The 131.7% increase in SBPS scores shows an excellent level of the spouse or bed partners satisfaction with EUPF surgery. Although the SI in PSG also revealed a significant decrease (48.6%, P.001), there was a poor correlation between this objective variable and the subjective SOS and SBPS evaluations. The discrepancy may be interpreted as the SI in PSG only measuring the frequency of snoring in one sleep examination, whereas the SOS evaluated snoring in multiple observation factors and periods. Besides, the EUPF surgery decreased the loudness and duration of snoring more than its frequency. The improvements in general and sleep-specific quality-of-life evaluations were not associated with the improvement of sleep respiratory disturbance variables in a proportional manner. It is not simply snoring and apneas that interfere with sleep in OSA patients. The disruption of sleep continuity and sleep characteristics also results in the disturbance of the health status of patients with OSA. The severity of OSA, as expressed by RDI, was only predictive of limited outcome measures (changes in the SF-36 PF, MH, and VT subscale scores). These findings ascertain the necessity of reporting both objective and subjective results, because quality of life is a distinct but integral part of the surgical results of OSA treatment. In conclusion, EUPF surgery can greatly reduce sleep-related respiratory disturbances and proves to be 199
6 an effective therapy to enhance the quality of life of patients with OSA. This study suggests that subjective and objective outcomes are equally important when reporting the surgical results. Submitted for publication September 9, 2002; final revision received March 5, 2003; accepted June 24, This study was presented at the World Congress of the International College of Surgery; October 31, 2002; Taipei, Taiwan. Corresponding author and reprints: Pa-Chun Wang, MD, MSc, Department of Otolaryngology, Cathay General Hospital, 280 Jen-Ai Rd, Section 4, 106 Taipei, Taiwan ( REFERENCES 1. Fujita S, Conway W, Zorick F, Roth T. Surgical correction of anatomic abnormalities in obstructive sleep apnea syndrome: uvulopalatopharyngoplasty. Otolaryngol Head Neck Surg. 1981;89: Friberg D, Carlsson-Nordlander B, Larsson H, Svanborg E. UPPP for habitual snoring: a 5-year follow-up with respiratory sleep recordings. Laryngoscope. 1995; 105: Sher AE, Schechtman KB, Piccirillo JF. The efficacy of surgical modifications of the upper airway in adults with obstructive sleep apnea syndrome. Sleep. 1996; 19: Li HY, Li KK, Chen NH, Wang PC. Modified uvulopalatopharyngoplasty: the extended uvulopalatal flap. Am J Otolaryngol. 2003;24: Hagert B, Wahren LK, Wikblad K, Odkvist L. Patients and cohabitants reports on snoring and daytime sleepiness, 1-8 years after surgical treatment of snoring. ORL J Otorhinolaryngol Relat Spec. 1999;61: Tytherleigh MG, Thomas MA, Connolly AAP, Bridger WM. Patients and partners receptions of uvulopalatopharyngoplasty for snoring. J Otolaryngol. 1999; 28: Miljeteig H, Mateika S, Haight JS, Cole P, Hoffstein V. Subjective and objective assessment of uvulopalatopharyngoplasty for treatment of snoring and obstructive sleep apnea. Am J Respir Crit Care Med. 1994;150: Li HY, Chen NH, Wang PC, Wang CJ. Use of three-dimensional computed tomography to evaluate upper airway patency for patients with sleep-disordered breathing. Otolaryngol Head Neck Surg. 2003;129: Rechtschaffen A, Kales A, eds. A Manual of Standardized Techniques and Scoring System for Sleep Stages of Human Subjects. Los Angeles, Calif: Brain Information Service/Brain Research Institute; NIH publication McHorney CA, Ware JE, Raczek AE. The MOS 36-Item Short-Form Health Survey (SF-36), II: psychometric and clinical tests of validity in measuring physical and mental health constructs. Med Care. 1993;31: New England Medical Center Hospital. IQOLA SF-36 Taiwan Standard Version 1.0. Boston, Mass: Health Institute, New England Medical Center; Gliklich RE, Wang PC. Validation of the Snore Outcomes Survey for patients with sleep-disordered breathing. Arch Otolaryngol Head Neck Surg. 2002;128: Chen NH, Li HY, Gliklich RE, Chu CC, Liang SC, Wang PC. Validation assessment of the Chinese version of the Snore Outcome Survey. Qual Life Res. 2002; 11: Johns MW. A new method for measuring daytime sleepiness: the Epworth Sleepiness Scale. Sleep. 1991;14: Chen NH, Johns MW, Li HY, et al. Validation of a Chinese version of the Epworth Sleepiness Scale. Qual Life Res. 2002;11: Li TC, Lin CC, Lee YD. Validation of the Chinese (Taiwan) version of SF-36 Health Survey in a random sample of central Taiwan population. In: Proceedings of the Pan-Pacific Conference of the International Society for Quality of Life Research; April 13-15, 2001; Tokyo, Japan. 17. Stauffer JL, Buick MK, Bixler EO, et al. Morphology of the uvula in obstructive sleep apnea. Am Rev Respir Dis. 1989;140: Chen NH, Li KK, Li HY, et al. Airway assessment by volumetric computed tomography in snorers and subjects with obstructive sleep apnea in a Far-East Asian population (Chinese). Laryngoscope. 2002;112: Gliklich RE, Taghizadeh F, Winkelman JW. Health status in patients with disturbed sleep and obstructive sleep apnea. Otolaryngol Head Neck Surg. 2000; 122: Johns MW. Daytime sleepiness, snoring, and obstructive sleep apnea. Chest. 1993;103: Briones B, Adams N, Strauss M, et al. Relationship between sleepiness and general health status. Sleep. 1996;19:
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