Hypopharyngeal surgery in obstructive sleep apnea: practice patterns, perceptions, and attitudes.

OBJECTIVE: To characterize factors that surgeons perceive as affecting selection of procedures designed to treat hypopharyngeal obstruction in adults with obstructive sleep apnea (OSA) and to compare those factors among 2 groups of American Academy of Otolaryngology-Head and Neck Surgery (AAO-HNS) member surgeons. STUDY DESIGN: Cross-sectional online survey. SUBJECTS AND METHODS: AAO-HNS members with a self-identified subspecialty interest either in sleep medicine or general otolaryngology were asked to complete an online survey, each respondent rated (5-point Likert scale) the perceived quality of their education and training and the role of specific factors in selection, both for procedure categories (eg, all hypopharyngeal) and individual procedures. Responses were examined for the entire group and for subgroups. RESULTS: Response rate was 27% (163/610). Sixty-five percent of respondents rated their surgical OSA education and training during postgraduate continuing medical education (CME) courses as of high quality, compared with 39% for residency/fellowship and 4% for medical school (P < 0.01). For individual hypopharyngeal procedures, over 40% of respondents reported limited training (except for tongue radiofrequency), and over 30% raised concerns about scientific evidence and reimbursement. Surgeon personal experience suggested treatment benefits without clearly favoring individual procedures. Respondents noted that patients were reluctant to undergo procedures, despite treatment recommendations, particularly maxillomandibular advancement. The sleep medicine subgroup reported higher ratings for education and training quality, research evidence, and personal experience with hypopharyngeal procedures. Concerns about adequate education and training, the quality of research evidence, and reimbursement issues were major factors in procedure selection. CONCLUSION: Multiple factors affect procedure selection. Surgeons identify concerns regarding education and training and research evidence.

Controlled release of hepatocyte growth factor from a bovine acellular scaffold for vocal fold reconstruction.

A bovine acellular scaffold was found to facilitate tissue remodeling in a rat model of vocal fold injury, whereas hepatocyte growth factor (HGF) has been shown to have an antiscarring effect in the larynx. This study examined the loading and release kinetics of HGF in vitro, and the potential of the acellular scaffold as a timed-release system for the delivery of HGF in vivo. Bilateral wounds were created in the posterior vocal folds of 20 rats, with HGF-loaded acellular scaffolds implanted into the wounds unilaterally, and scaffolds without HGF implanted into the contralateral vocal folds as control. The rats were humanely sacrificed after 3, 7, 30, and 90 days and their larynges were examined histologically and immunohistochemically. Expressions of key matrix proteins in the vocal fold coronal sections were quantified by digital image analysis. Results demonstrated a gradual, sustained release of HGF for at least 7 days in vitro, consistent with the detection of glycosaminoglycans inherent of the scaffold. In rat vocal folds implanted with HGF-loaded scaffolds, apparently fewer inflammatory cells were observed 3 days after surgery when compared to the control. The mean relative densities of collagen III and hyaluronic acid were significantly lower than those of the control 7 days after surgery. Scaffold implants were apparently degraded by 3 months in all animals, with no evidence of fibrosis or calcification. These data suggested that the bovine acellular scaffold could be promising for the exogenous delivery of select growth factors in vivo.

A bovine acellular scaffold for vocal fold reconstruction in a rat model.

With a rat model of vocal fold injury, this study examined the in vivo host response to an acellular xenogeneic scaffold derived from the bovine vocal fold lamina propria, and the potential of the scaffold for constructive tissue remodeling. Bilateral wounds were created in the posterior vocal folds of 20 rats, and bovine acellular scaffolds were implanted into the wounds unilaterally, with the contralateral vocal folds as control. The rats were humanely sacrificed after 3 days, 7 days, 1 month, and 3 months, and the coronal sections of their larynges were examined histologically. Expressions of key matrix proteins including collagen I, collagen III, elastin, fibronectin, hyaluronic acid, and glycosaminoglycans (GAGs) were quantified with digital image analysis. Significant infiltration of host inflammatory cells and host fibroblasts in the scaffold implant was observed in the acute stage of wound repair (3 days and 7 days postsurgery). The mean relative densities of collagen I, collagen III, and GAGs in the implanted vocal folds were significantly higher than those in the control after 3 days, followed by gradual decreases over 3 months. Histological results showed that the scaffolds were apparently degraded by 3 months, with no fibrotic tissue formation or calcification. These preliminary findings suggested that the bovine acellular scaffold could be a potential xenograft for vocal fold regeneration.