Sang-Wook Kim

Staphylococcus aureus enterotoxin B contributes to induction of nasal polypoid lesions in an allergic rhinosinusitis murine model.

Background Studies on the pathophysiology of nasal polyps in human subjects have been limited; thus an animal model is needed. There is increasing evidence supporting the role of Staphylococcus aureus enterotoxin B (SEB) in the pathogenesis of nasal polyposis. The aim of this study was to investigate the histological and immunologic effects of SEB on the formation of nasal polypoid lesions in an allergic rhinosinusitis murine model. Methods After induction of an ovalbumin (OVA)-induced allergic rhinosinusitis, OVA with SEB (5 or 500 ng) was instilled into the nasal cavity of mice for 8 weeks. Control mice did not receive SEB or OVA instillation. Histopathological changes were observed using hematoxylin and eosin, Sirius red, Giemsa, Massons trichrome, and Alcian blue stains. The levels of interleukin (IL)-4, IL-5, IL-8, IL-13, eotaxin, interferon gamma, total IgE, and OVA-specific IgE from serum or nasal lavage fluid were measured using enzyme-linked immunosorbent assay. Results The group treated with OVA plus 5 ng of SEB had significantly more mucosal lesions with epithelial disruption and nasal polypoid lesions than mice treated with OVA only, showing a significant increase in the infiltration of total inflammatory cells, eosinophils, and lymphocytes than the other groups. Levels of IL-5, eotaxin, and OVA-specific IgE in nasal lavage fluid were increased in the group treated with OVA plus 5 ng of SEB than in the other groups. A higher number of secretory cells in the groups treated with OVA plus SEB was observed than in other groups. Conclusion Low-dose SEB induced nasal polypoid lesions with an increased eosinophilic infiltration in an allergic rhinosinusitis murine model.

Periostin may play a protective role in the development of eosinophilic chronic rhinosinusitis with nasal polyps in a mouse model.

Several genes have been reported to be upregulated in human nasal polyps in previous genetic analyses. Among these genes, periostin is known to be overexpressed in nasal polyps obtained from aspirin‐sensitive patients. Using periostin‐null mice, we investigated the role of periostin in a murine model of eosinophilic rhinosinusitis with nasal polyps.

Bronchial hyperresponsiveness in pediatric rhinitis patients: the difference between allergic and nonallergic rhinitis.

Background Numerous studies have examined the relationship of bronchial hyperresponsiveness (BHR) to asthma or allergic rhinitis (AR). However, little is known regarding the association between BHR and nonallergic rhinitis (NAR). This study investigated the prevalence and risk factors of BHR in pediatric patients with rhinitis and analyzed the difference between patients with AR and those with NAR. Methods A total of 227 subjects with rhinitis aged 6–15 years underwent a parental survey and laboratory tests, including skin-prick test and methacholine challenge test. Outcome variables were analyzed in relation to BHR. Results The prevalence of BHR was 55.7 and 25.5% in patients with AR and those with NAR, respectively. The persistency of rhinitis, blood eosinophil count, and baseline lung function were significantly associated with BHR in patients with AR, whereas individual or familial medical history, environmental factors, the serum immunoglobulin E level, the number of sensitized allergens, and the wheal size ratio of allergen to histamine did not affect the BHR rate. In multivariate analysis, the persistency of rhinitis was the only significant predictor of BHR in AR patients. However, persistent rhinitis symptoms did not increase the risk of BHR in NAR patients. Conclusion BHR occurs over two times more frequently in children with AR than in those with NAR. In addition, persistent nasal inflammation appears to increase the risk of BHR only in the presence of atopy.

Clinical and histologic studies of olfactory outcomes after nasoseptal flap harvesting.

Since the introduction of an endonasal endoscopic approach in transsphenoidal pituitary surgery, reports of perioperative olfactory changes have presented conflicting results. We examined the incidence of olfactory loss in cases of endoscopic transsphenoidal pituitary surgery with skull base repair using the nasoseptal flap (NSF) and the effects of monopolar electrocautery commonly used in designing the NSF.

Advantages of glove finger-coated polyvinyl acetate pack in endoscopic sinus surgery.

Background This study investigated the efficacy of glove finger–coated polyvinyl acetate (PA) pack on hemostasis, pain levels, and wound healing after endoscopic sinus surgery (ESS). Methods A prospective, randomized, double-blinded controlled study was performed in 30 patients who underwent bilateral ESS for chronic rhinosinusitis. Fifteen patients (control group) had both nasal cavities packed with PA pack (Merocel; Medtronic Xomed, Jacksonville, FL) and another 15 subjects (experimental group) had their nasal cavities packed with PA in a glove finger. Pain levels were assessed by patients on a visual analog scale 12 hours after surgery and at the time of packing removal. The amount of bleeding on removal were quantified by weighing it after removal. Lund-Kennedy score and synechiae formation were assessed at 4, 8, and 12 weeks after surgery. The use of analgesics and oral steroid was compared between the two groups. Results The experimental group showed lower levels of pain and lessened bleeding during packing removal than the control group. There were no differences in pain levels at 12 hours after surgery, use of analgesics and oral steroid between the two groups. One (6%) of each group had postoperative bleeding and required additional packing for hemostasis. Lower Lund-Kennedy score at postoperative 4 weeks was documented in the experimental group. In addition, two (13%) control subjects developed a synechiae between the middle turbinate and the lateral wall. Conclusion PA packing in a glove finger is advantageous in terms of pain, bleeding on packing removal, and postoperative wound healing, compared with PA pack only.

Therapeutic effects of intranasal cyclosporine for eosinophilic rhinosinusitis with nasal polyps in a mouse model.

Background Chronic rhinosinusitis (CRS) with nasal polyps (CRSwNP) is a principally type 2 T helper cell (Th2)-mediated inflammatory disease. Systemic corticosteroids currently represent the most effective treatment for CRSwNP, but their long-term use is constrained due to their detrimental side effects. Long-term use oftopical steroids is safe, but their efficacy is often limited. Topical cyclosporine has proven to be safe and effective for Th2-mediated diseases such as allergic conjunctivitis. Objective It was hypothesized that topical cyclosporine would be an effective novel drug for the treatment of CRSwNP; its therapeutic efficacy was assessed using a previously established mouse model. Methods After induction of eosinophilic CRSwNP in four-week-old BALB/c mice according to previous protocols, the therapeutic effects of intranasal cyclosporine were evaluated and compared with those of triamcinolone acetonide (TAC). Histopathologic changes were evaluated using hematoxylin and eosin for polyp formation and Sirius red staining for eosinophilic infiltration. The production of cytokines in sinonasal tissues, including tumor necrosis factor (TNF), interleukin (IL)-2, interferon (IFN)-y, IL-4, IL-5, IL-13, and IL-17A, was measured using a cytometric bead array. Results The number of polyp-like lesions was reduced significantly only by systemic TAC, but the degree of eosinophilic infiltration was decreased significantly by topical cyclosporine, the potency of which was similar to that of topical or systemic TAC. Except for IFN-γ, the majority of measured cytokines were reduced significantly by topical cyclosporine, although their effects on IL-2 and IL-13 were less potent than those of systemic TAC. Conclusion Topical cyclosporine might be an effective drug for the management of CRSwNP.

Postoperative Olfactory Results in Chronic Rhinosinusitis with Nasal Polyposis According to Wound Healing Status

Objectives Postoperative wound healing status has not been considered in earlier studies on olfactory changes after surgery. This may be a factor accounting for the equivocal postoperative olfactory results. The aim of this study was to investigate postoperative olfactory results according to wound healing status. Methods Fifty patients who underwent endoscopic sinus surgery for chronic rhinosinusitis with nasal polyps with smelling disturbance were examined preoperatively, and at 6 months after surgery. Patients were divided into two groups according to postoperative Lund-Kennedy score: favorable and unfavorable wound healing. Preoperative ostiomeatal unit computed tomography (CT), such as Lund-Mackay score and olfactory cleft opacification score, clinical characteristics and olfactory function tests such as the butanol threshold test and cross-cultural smell identification test, and questionnaire responses were compared between the two groups. Results There were no differences in preoperative clinical characteristics between the favorable and unfavorable wound healing groups. The favorable wound healing group displayed greater improvement of olfactory results after surgery than the unfavorable wound healing group. Postoperative olfactory improvement patterns showed a hierarchy from subjective to objective improvement and from threshold to identification improvement. Patients who had postoperative favorable wound healing but showed no success of olfaction were characterized by more severe preoperative subjective symptoms and higher olfactory cleft opacification, especially in the upper part of olfactory cleft on preoperative CT scan. Conclusion Wound healing status is an apparent risk factor for postoperative olfactory improvement. Moreover, preoperative opacification in the olfactory cleft may predict bad olfactory results after surgery, even in patients with favorable wound healing.

Treatment outcomes of sinonasal malignant melanoma: a Korean multicenter study.

The aim of this work was to evaluate factors that influence local recurrence and survival after surgical resection of sinonasal malignant melanoma, using a large population‐based multicenter study in Korea.

Comparative Study for Efficacy and Safety of Adenoidectomy according to the Surgical Method: A Prospective Multicenter Study

Background/Objective There have been several operative techniques for adenoidectomy and their efficacy and morbidity are different according to the technique. This prospective multicenter study was aimed to compare the efficacy and morbidity of coblation adenoidectomy (CA) with those of power-assisted adenoidectomy. Study Design Prospective multi-institutional study. Methods Children who underwent CA, power-assisted adenoidectomy with cauterization (PAA+C) or without cauterization (PAA-C) due to adenoid hypertrophy were enrolled from 13 hospitals between July 2013 and June 2014. Mean operation time, degree of intraoperative bleeding and postoperative bleeding rate were evaluated. Results A total of 388 children (mean age ± standard deviation = 6.6 ± 2.5 years; 245 males and 143 females) were included. According to the adenoidectomy technique, the children were classified into 3 groups: (1) CA (n = 116); (2) PAA+C (n = 153); and (3) PAA-C (n = 119). Significant differences were not found in age and sex among three groups. In the CA group, mean operation time was significantly shorter (P < 0.001) and degree of intraoperative bleeding was significantly less (P < 0.001) compared to PAA+C or PAA-C group. Delayed postoperative bleeding rate of PAA-C group was significantly higher than that of CA or PAA+C group (P = 0.016). Conclusions This prospective multicenter study showed that CA was superior to PAA in terms of mean operation time and degree of intraoperative bleeding.

Interleukin‐17A–induced inflammation does not influence the development of nasal polyps in murine model

Nasal polyposis associated with chronic rhinosinusitis (CRS) is a chronic inflammatory disease that is characterized by infiltration of many inflammatory cells. Meanwhile, interleukin (IL)‐17A is a well‐known proinflammatory cytokine that induces both eosinophilic and neutrophilic inflammation. We investigated the role of IL‐17A in the development of nasal polyps in the CRS murine model.