Prognostic factors of pediatric endoscopic sinus surgery

OBJECTIVE: Pediatric endoscopic sinus surgery (ESS) is performed for refractory cases of rhinosinusitis that do not respond to medical management. However, few studies have been reported for the prognostic factors affecting the outcomes of pediatric ESS. The aim of this study was to investigate the prognostic factors affecting the outcomes of pediatric ESS. MATERIALS AND METHOD: Medical records of 97 pediatric patients who had undergone ESS from February 1995 to October 2003 were reviewed retrospectively. We classified the patients into two groups based on outcome, i.e., either good or poor, according to the postoperative endoscopic findings. Then univariate and multivariate analyses were performed to compare the following nine characteristics between the good and poor outcome groups: the presence of allergy, bronchial asthma, adenotonsillar hypertrophy, history of previous sinus surgery, presence of a smoker in the family, degree of polyposis, preoperative disease extent scored by CT scan findings, blood eosinophil count, and eosinophil infiltration in the nasal mucosa. RESULT: The overall success rate was 70% based on the objective postoperative endoscopic finding. Statistical differences were found between the good and poor groups in terms of the degree of preoperative polyposis and CT staging in univariate analysis, whilst in multivariate logistic regression analysis severe polyposis and indirect smoking predicted poor outcome after pediatric ESS. CONCLUSION: Pediatric ESS with severe polyposis, high CT rhinosinusitis staging, or indirect smoking predisposes to a poorer outcome. This needs to be taken into consideration when performing ESS for children.     

Histopathologic characteristics of chronic sinusitis with bronchial asthma

CONCLUSION: These findings suggest that patients with both sinusitis and asthma present the histopathologic characteristic of a marked chronic inflammatory reaction, and that eosinophil infiltration may play a significant role in this marked inflammation of the sinus mucosa. OBJECTIVE: Chronic sinusitis and bronchial asthma are known to be closely related. However, the appearance of the mucosa in chronic sinusitis patients with asthma is somewhat different from that in patients without asthma. MATERIAL AND METHODS. We compared the sinus mucosal histopathologies of asthmatic patients with those of non-asthmatic patients. Fifty-three sinusitis patients with a diagnosis of asthma and 54 sinusitis patients without asthma, who served as controls, were enrolled in the study. All of these patients underwent endoscopic sinus surgery. The following seven light microscopic findings were compared in the asthmatic and non-asthmatic groups: the thickness of the basement membrane, goblet cell hyperplasia, subepithelial edema, submucous gland formation, eosinophil infiltration, lymphocyte infiltration and polymorphonuclear leukocyte infiltration. In addition, we explored a possible link between asthma and sinusitis by comparing the following factors in asthmatic and non-asthmatic patients: the presence of allergy, the degree of preoperative polyposis and the extent of preoperative disease as scored by means of ostiomeatal unit CT findings. RESULTS: No statistically significant differences were found between the two groups in terms of the presence of allergy, the degree of preoperative polyposis or the extent of preoperative disease. Basement membrane thickening, goblet cell hyperplasia and eosinophil infiltration were more prominent in the asthmatic compared to the non-asthmatic group (p <0.05).     

Endoscopic sinus surgery improves pulmonary function in patients with asthma associated with chronic sinusitis

We evaluated the clinical efficacy of endonasal endoscopic sinus surgery (ESS) in patients with asthma associated with chronic sinusitis. Twenty-one patients (13 men and 8 women) from 27 to 72 years old were enrolled in this study. All patients had had sinus-related symptoms for more than 3 months and had computed tomographic evidence of paranasal sinus opacification. Fifteen patients underwent bilateral endonasal ESS under local anesthesia, and 6 other patients without surgery were controls. The sinus-related symptoms of the preoperative and postoperative periods were assessed via a questionnaire. The period 6 months prior to surgery was compared with that 6 months postoperatively with regard to peak expiratory flow and total dosage of systemic glucocorticoids. Sinus-related symptoms in the ESS group were significantly improved 6 months postoperatively. The average peak expiratory flow 6 months following surgery was improved in the ESS patients, ranging from 40 to 190 L/min. Seven patients showed a reduction in the need for corticosteroids, whereas 2 patients were unchanged and 2 patients required larger dosages. The remaining 4 patients needed no corticosteroids before or after ESS. No significant changes in sinus-related symptoms or peak expiratory flow were obtained for the control group. Improvement of paranasal sinus disease by successful ESS can alleviate pulmonary dysfunction in asthma associated with chronic sinusitis. We believe that adequate and positive treatment for chronic sinusitis would reduce not only the nasal and sinus-related symptoms evoked by chronic sinusitis, but also some of the signs induced by asthma.     

Study on endoscopic sinus surgery management of chronic sinusitis with nasal polyps

Endoscopic sinus surgery is commonly used to treat chronic sinusitis. Subjects were 79 chronic sinusitis patients--50 men and 29 women aged 17 to 79 years (average: 50.6 years) undergoing endoscopic sinus surgery in our department from January 1993 to December 1997. Mean follow-up was 17.5 months. We evaluated preoperative staging of chronic sinusitis based on Kennedy staging. Most were stage 3. This type of staging was not effective in predicting nasal polyp relapse. We found that cases with diffuse polyposis and associated disease such as bronchial asthma or aspirin-induced asthma tended to experience a polyp relapse. Our results suggest that postoperative treatment is important in maintaining patency of the ostiomeatal complex, nasal polyp or edematous mucosa relapse must be treated early in on in occurrence.     

少年儿童鼻内镜手术远期疗效及相关临床因素探讨

目的 探讨接受内镜鼻窦手术少年儿童鼻窦炎患者的疗效及影响疗效的相关因素。方法 接受内镜鼻窦手术的少年儿童鼻窦炎性疾病患者268例(432侧)，年龄3～17岁，平均14．3岁，男186例，女82例。全身麻醉176例，局部麻醉12例。188例(305侧)术后随访超过1年，占病例总数70．1％。随访在鼻内镜下进行，以黏膜表面麻醉为主。术后综合治疗包括：清理术腔、鼻腔冲洗、抗生素、激素、黏液促排剂及免疫调节剂等。结果 慢性鼻窦炎89例(147侧)，慢性鼻窦炎、鼻息肉86例(142侧)，鼻窦黏液囊肿13例(16侧)。治愈132例(70．2％)，好转43例(22．9％)，无效13例(6．9％)。术后头痛缓解率93．1％(175／188)，其次为鼻堵为85．1％(160／188)，脓涕60．1％(113／188)。11例手术前后无变化，2例症状较术前加重。术前56例失嗅者，术后34例(60．7％)改善或恢复。术后症状完全缓解123／188例(65．4％)，部分缓解52／188例(27．7％)，总有效率为93．1％。8例(4．3％)接受再手术。结论 少儿慢性鼻窦炎、鼻息肉内镜鼻窦手术远期疗效满意，应重视术中黏膜合理取舍和积极处理中鼻甲；随访质量为影响手术远期疗效重要因素。患者就医和手术前是否进行了规范药物治疗为手术适应证重要前提。     

少年儿童鼻内镜手术远期疗效及相关临床因素探讨

目的　探讨接受内镜鼻窦手术少年儿童鼻窦炎患者的疗效及影响疗效的相关因素。方法　接受内镜鼻窦手术的少年儿童鼻窦炎性疾病患者 2 68例 (43 2侧 ) ,年龄 3～ 17岁 ,平均 14 3岁 ,男 186例 ,女 82例。全身麻醉 176例 ,局部麻醉 12例。 188例 (3 0 5侧 )术后随访超过 1年 ,占病例总数 70 1%。随访在鼻内镜下进行 ,以黏膜表面麻醉为主。术后综合治疗包括 :清理术腔、鼻腔冲洗、抗生素、激素、黏液促排剂及免疫调节剂等。结果　慢性鼻窦炎 89例 (14 7侧 ) ,慢性鼻窦炎、鼻息肉86例 (14 2侧 ) ,鼻窦黏液囊肿 13例 (16侧 )。治愈 13 2例 (70 2 % ) ,好转 43例 (2 2 9% ) ,无效 13例(6 9% )。术后头痛缓解率 93 1% (175/ 188) ,其次为鼻堵为 85 1% (160 / 188) ,脓涕 60 1% (113 /188)。 11例手术前后无变化 ,2例症状较术前加重。术前 56例失嗅者 ,术后 3 4例 (60 7% )改善或恢复。术后症状完全缓解 12 3 / 188例 (65 4% ) ,部分缓解 52 / 188例 (2 7 7% ) ,总有效率为 93 1%。 8例 (4 3 % )接受再手术。结论　少儿慢性鼻窦炎、鼻息肉内镜鼻窦手术远期疗效满意 ,应重视术中黏膜合理取舍和积极处理中鼻甲 ;随访质量为影响手术远期疗效重要因素。患者就医和手术前是否进行了规范药物治疗为手术适应证     

Outcome analysis of endoscopic sinus surgery in patients with nasal polyps and asthma

OBJECTIVE: To investigate the efficacy of endoscopic sinus surgery (ESS) in the management of chronic sinusitis and asthma in patients with nasal polyps and steroid-dependent asthma. STUDY DESIGN: Retrospective chart review. METHODS: The study included 17 patients who underwent ESS with nasal polyps, steroid-dependent asthma with or without aspirin sensitivity and a minimum of 1 year postoperative follow-up. Nine patients were ASA sensitive, and eight patients were ASA tolerant. Chronic sinusitis and asthma were evaluated using subjective (patient complaints) and objective (computed tomography scans, pulmonary function tests, steroid doses) criteria. Preoperative data were compared with data obtained 12 to 18 months postESS. Tissue samples were graded for degree of inflammation and edema. RESULTS: Thirteen of the 17 (76.5%) patients reported improved clinical symptoms postESS. The postoperative Lund-Mackay scores were statistically lower for the 17 patients (P <.0001). The group experienced improvement in postoperative forced expiratory volume at 1 second (FEV1) (P <.014). Twelve of 17 (70.6%) experienced reduction in systemic steroid usage (P <.048). The ASA sensitive patients did not have a statistical improvement in postoperative FEV1 (P >.08) and sinonasal symptoms (P >.16) compared with the ASA tolerant group. Polyp tissue from the ASA sensitive patients demonstrated more edema and more inflammation on average than ASA tolerant polyps, but the results were not statistically significant. CONCLUSION: ESS demonstrates a beneficial effect on the sinonasal and asthma symptomatology in patients with nasal polyps and asthma using objective measures. Subset of aspirin-tolerant patients have statistically better outcome for sinonasal symptoms and pulmonary function testing than aspirin-sensitive patients.     

Effect of functional endoscopic sinus surgery in patients of chronic sinusitis with bronchial asthma

Rhinosinusitis and bronchial asthma have been found to be coexistent in different studies. A prospective study of 23 patients with bronchial asthma who underwent Functional endoscopic sinus surgery (F.E.S.S) for coexistent chronic sinusitis was undertaken and the effect of endoscopic sinus surgery on bronchial asthma was analyzed in these patients using both subjective and objective criteria. It is concluded in this study that Functional endoscopic sinus surgery for chronic sinusitis in cases of bronchial asthma helps in reduction of their asthma symptoms, requirement of medication and helps in improving their peak expiratory flow.     

Predictive factors and outcomes in endoscopic sinus surgery for chronic rhinosinusitis

PURPOSE: To assess objective and quality of life (QOL) outcomes before and after endoscopic sinus surgery (ESS) in patients with chronic rhinosinusitis (CRS) and to determine preoperative factors that predict surgical outcome in these patients. METHODS: One hundred nineteen adult patients with CRS and a mean follow-up of 1.4 +/- 0.35 years were evaluated prospectively including the following patient factors: prior sinus surgery, polyps, asthma, acetylsalicylic acid intolerance (ASA), smoking, allergy, depression, and sex. Computed tomography (CT), endoscopy, and QOL assessment was performed. Predictive value of patient factors was determined based on change in endoscopy and QOL scores after ESS. RESULTS: Objective outcomes: preoperative CT scores were significantly worse in patients with polyps, asthma, and ASA, whereas CT score was unaffected by prior sinus surgery, smoking, allergy, depression, and sex. Patients with CRS demonstrated significant improvement on nasal endoscopy after ESS, but preoperative, postoperative, and change in scores were affected by certain patient factors. Endoscopy scores were significantly worse in patients with prior sinus surgery, polyps, asthma, and ASA, but these patients also experienced the greatest improvement in endoscopy scores. Smokers and patients with depression had the least change in endoscopy scores. QOL outcomes: patients with CRS experienced improvement in QOL after ESS. Pre- and postoperative QOL was positively affected by polyps and adversely affected by ASA, depression, and female sex, but these groups still experienced significant improvement in QOL scores. Pre- and postoperative QOL was unaffected by prior sinus surgery, asthma, smoking, and allergies, and all of these groups experienced significant improvement in QOL scores. Factors predictive of outcome: ASA and depression were predictive of worse outcome. Preoperative CT scores approached significance as being predictive of outcome. CONCLUSION: Surgical management of CRS was associated with significant improvement on objective and QOL measures; however, specific patient factors, in particular ASA and depression, predict poorer outcome. Preoperative CT may be a predictor of endoscopic and QOL outcome and deserves further study.     

The cytology and microbiology of persistent paranasal sinus secretions after endoscopic sinus surgery: a controlled study

OBJECTIVE: To determine the cellular composition and influence of microbiology on persistent paranasal sinus secretions after endoscopic sinus surgery (ESS). METHODS: Persistent sinus secretions from a consecutive series of patients after ESS were studied with cytopathology and cultures for aerobic, anaerobic, and fungal organisms. A control group consisting of patients without persistent secretions after ESS was also studied. Epithelial, neutrophil, and eosinophil cell presence was semiquantitatively assessed on a 4-point scale and compared between control and diseased groups. Cellular composition was then stratified and analyzed according to the presence of microorganisms. RESULTS: A total of 50 diseased and 24 control patients were studied. Both diseased and control patients demonstrated sloughed epithelial cells in secretions (53.1% and 66.7%, respectively, P = .131). The diseased group exhibited significantly higher eosinophilic or eosinophilic/neutrophilic cellularity than the controls (P = .048). The average neutrophil infiltration score was 0.82 versus 0.54 for the controls (P = .104). For the diseased group, the mean eosinophil score was 1.56 versus 0.96 in the control group (P = .035). Pathogenic bacteria were identified in 64% of the diseased group patients versus 54.2% in controls (P = .454). Only two fungal cultures were positive (diseased group). Microbiological analysis indicated that in the absence of bacteria, diseased group patients mainly manifested an eosinophilic presence, whereas in the presence of bacteria, the neutrophil response was enhanced in diseased patients and eosinophil response was enhanced in controls. CONCLUSIONS: Persistent sinus secretions after ESS are primarily driven by an eosinophilic presence. Patients without inflammatory exudate after ESS respond to bacteria with increased eosinophilia, whereas hypersecretory patients demonstrate both increased neutrophil and eosinophil presence.     

儿童及青少年鼻内镜手术

目的探讨儿童及青少年慢性鼻窦炎患者接受鼻内镜手术治疗的疗效及相关影响因素。方法对86例(132侧)儿童及青少年慢性鼻窦炎患者行功能性鼻内镜手术,术后随访换药6个月以上及药物综合治疗。结果86例患者治愈60例(69.8%),好转22例(25.6%),无效4例(4.6%),总有效率95.4%。结论儿童及青少年慢性鼻窦炎经保守治疗无效时行鼻内镜手术疗效满意,其手术技术和术后随访及综合治疗影响手术远期疗效。     

慢性鼻窦炎鼻息肉合并支气管哮喘患者鼻窦内镜术后对支气管哮喘疗效的影响

目的观察鼻窦内镜术(endoscopic sinu ssurgery，ESS)对慢性鼻窦炎伴支气管哮喘患者哮喘发作的影响。方法对210例慢性鼻窦炎患者施行ESS术，其中伴有支气管哮喘病史者42例(20．0％)。210例患者均于术前、术后采用酶联免疫吸附测定法(ELISA)检测外周血单个核细胞(PBMC)培养上清液中的白细胞介素4(IL-4)，干扰素γ(IFN-γ)，可溶性白细胞介素2受体(sIL-2R)和可溶性IgE低亲和力受体(solube CD23，sCD23)的含量，并与20例正常对照组进行比较。通过主观和客观标准评定42例患者哮喘发作及对皮质类固醇的耐受状况，并对术后患者进行为期1年(10例)和3年(32例)的随访。结果鼻窦炎合并支气管哮喘患者术前PBMC培养上清液中IL-4，sIL-2R、sCD23含量较对照组显著升高，而IFN-γ含量较对照组显著减少。术后IL-4、sIL-2R、sCD23含量较对照组显著降低，而IFN-γ含量显著增高。术后哮喘改善水平由随访术后1年的45％提高到术后3年的70％。42例中32例(76％)哮喘发作次数明显减少，术前长期服用类固醇的2l例中，14例(67％)减少了对口服类固醇的使用。结论ESS对慢性鼻窦炎伴支气管哮喘患者的治疗有较满意的远期疗效。ESS能调节IL-4、IFN-γ sIL-2R、sCD23水平，降低哮喘的发作频率和对类固醇的依赖。     

Endoscopic sinus surgery in children with chronic sinus disease failed on medical management

This pilot study assessed the safety and efficacy of Endoscopic Sinus Surgery (ESS) in children with chronic sinus disease. A total of 150 patients were carefully evaluated for intractable signs and symptoms of chronic sinus disease and 40 children were deemed appropriate candidates for ESS. All patients were medical management failures. Thirty percent of these children had bronchial asthma and fifteen percent had allergies. All patients were followed for atleast one year after surgery. Overall success rate as assessed at one year was 85.3%. The success was evaluated by a scoring system evolved out of this study for the subjective relief of symptoms. The commonest surgical complication observed was synechiae between the middle turbinate and the lateral nasal wall, that developed in 10% cases. The revision surgery was required in only 5 children who had associated systemic illness like bronchial asthma or allergies.     

Immunohistochemical analyses of MUC5AC mucin expression in sinus mucosa of children with sinusitis and controls

OBJECTIVES: The purpose of this study was to analyze MUC5AC protein expression in sinus mucosal specimens of children with and without chronic sinusitis. METHODS: Morphometric, histologic, and immunohistochemical analyses were carried out on sinus mucosa of 7 children with chronic sinusitis and 6 children without sinusitis. RESULTS: MUC5AC protein was expressed in a subset of goblet cells in the surface epithelium, but not in the submucosal glands in either pediatric population. The number of goblet cells that expressed MUC5AC mucin was not significantly different in patients with and without chronic sinusitis. All specimens had similar numbers of goblet cells in the surface epithelium. CONCLUSIONS: The data demonstrate that neither goblet cell hyperplasia nor increased MUC5AC expression occurs in the sinus mucosa of children with chronic sinusitis. This suggests that in contrast to asthma, in which goblet cell hyperplasia is present in the lower respiratory tract, mucus hypersecretion in pediatric chronic sinusitis may involve other secretory cells, eg, submucosal glandular cells, and mucins secreted by these glandular cells.     

慢性鼻及鼻窦炎鼻内镜手术疗效及黏膜上皮化分析

目的总结鼻内镜手术治疗慢性鼻及鼻窦炎的疗效和术腔黏膜上皮化规律,探讨影响疗效和术后黏膜上皮化的相关因素。方法对520例慢性鼻及鼻窦炎接受鼻内镜手术患者的手术疗效和术后黏膜上皮化规律进行临床分析。疗效分析应用X~2检验,黏膜上皮化时间分析用非参数秩和检验。结果治愈率74.4%,好转率21.0%,总有效率95.4%。术后平均黏膜上皮化时间为14.0周。疾病的分型分期、是否合并哮喘、变应性鼻炎和疗效与黏膜上皮化时间有相关性(P<0.05)。结论鼻内镜手术治疗慢性鼻及鼻窦炎是有效和安全的,术后黏膜上皮化时间平均需要3个月。病情重、合并哮喘或变应性鼻炎的患者疗效较差,黏膜上皮化时间长。鼻腔粘连通过定期合理的复查和处理,大多数能够得到有效的解除。     

鼻内镜手术疗效综合评价

目的 探讨鼻内镜手术对慢性鼻窦炎及鼻息肉疗效的综合评价方法.方法 采用声反射鼻腔测量系统、前鼻测压计、T＆T嗅觉计定量检查法和术区黏膜评分法,对46例慢性鼻窦炎及鼻息肉患者鼻气道阻力、嗅觉、鼻腔术区黏膜形态进行测试.结果 鼻内镜手术后患者的鼻气道通气、嗅觉有明显好转;术后鼻腔、黏膜状况与功能恢复有显著相关性.结论 鼻气道阻力、嗅觉功能测试、鼻声反射检查、术区黏膜评分检测作为手术前后鼻功能的检测手段,可对术后疗效进行客观的综合评价.     

改良Wigand式鼻内镜手术治疗慢性鼻窦炎鼻息肉的临床研究

目的探讨改良Wigand式鼻内镜手术对复杂慢性鼻窦炎、鼻息肉的治疗意义。方法回顾性总结87例行改良Wigand式鼻内镜手术的慢性鼻窦炎、鼻息肉患者,手术方式为在鼻内镜下先开放中鼻道,然后从中鼻甲内外侧联合进路扩大蝶窦自然开口,从后向前开放各个鼻窦。结果87例174侧手术,无并发症发生,术后随访3～6月复发病例仅3例。结论改良Wigand式鼻内镜手术是治疗慢性鼻窦炎、鼻息肉的一种安全有效的手术方式。     

鼻窦内镜手术后术腔未按时清理的矫正性治疗

目的探讨鼻窦内镜手术后术腔未按时清理的矫正性治疗的必要性。方法回顾性分析46例慢性鼻窦炎、鼻息肉病人鼻窦内镜手术后因经济困难、工作忙等原因未及时清理术腔,致使症状加重被动复诊而行内镜下术腔矫正性治疗。结果46例病人经矫正性治疗后随访1年以上,其中治愈30例(65.2%),好转9例(19.6%),无效7例(15.2%)。结论鼻窦内镜手术后术腔未按时清理的矫正性治疗可矫正鼻窦内镜手术后连续一定时期内未主动随访所致术腔的再生病变,提高治愈率。     

Efficacy of endoscopic sinus surgery in the management of patients with asthma and chronic sinusitis

An association between chronic sinusitis and asthma has been noted for many years, although the precise nature of the relationship is poorly understood. Earlier studies, using traditional surgical techniques, have demonstrated subjective improvement in asthmatic complaints. Reports demonstrating improvement following endoscopic sinus surgery for chronic sinusitis are rare. To report our experience with endoscopic sinus surgery and asthmatics, we reviewed the charts of 75 consecutive patients with asthma and chronic sinusitis who underwent endoscopic sinus surgery between 1994 and 1996. Study criteria included the following: chronic sinusitis, one year preoperative and one year postoperative follow-up from endoscopic sinus surgery, and asthma requiring inhaled steroids and oral prednisone for control. Many patients required prednisone bursts for control of asthma. Number of days and total dose of oral prednisone were used as objective measures of asthma control. Number of weeks of antibiotics was used as a relative measure of sinusitis. Fourteen of the 15 patients meeting study criteria decreased their postoperative prednisone requirement by total number of days (preoperative 84 versus postoperative 63 days [p < 0.0001]). Postoperatively, patients required an average of 1300 mg less oral prednisone (p < 0.033). Antibiotic use also decreased, with an average use of antibiotic nine weeks preoperatively versus seven weeks postoperatively (p < 0.045). This study provides corroborative objective evidence that, at least in the short term, endoscopic sinus surgery is efficacious in the management of patients with chronic sinusitis and asthma.     

Study of allergic fungal sinusitis in 40 surgical cases of chronic paranasal sinusitis

Allergic fungal sinusitis is chronic and paranasal, related to fungal allergy. Many papers on allergic fungal sinusitis have been reported in the United State, and the incidence is 5% to 10% among patients with chronic paranasal sinusitis. Although cases of allergic fungal sinusitis have been reported in Japan, the incidence is unclear. We studied allergic fungal sinusitis in 40 consecutive patients--26 men and 14 women--undergoing endoscopic sinus surgery at Keiyukai Sapporo Hospital December 2000 to July 2001. We checked for allergic rhinitis and asthma, a history of surgery for nasal polyps and chronic sinusitis, the presence of nasal polyps, grading of sinusitis via computed tomography, nonspecific IgE and allergen-specific IgE for fungi in serum, eosinophilia in nasal smears, paranasal eosinophilic mucin, and histology and fungal culture of paranasal sinus mucus. None had typical allergic fungal sinusitis, but 1 had eosinophilic paranasal mucin, high IgE, and false-positive IgE for fungi. We studied clinical data and histology of fungi and paranasal mucosa in 9 cases with fungal maxillary sinusitis, but none had allergy or eosinophilic mucin. This suggested that few patients with allergic fungal sinusitis exist among those with chronic paranasal sinusitis.