Right Versus Left Cuff Position for Upper Airway Stimulation.

OBJECTIVE: Upper airway stimulation (UAS) is a treatment option for obstructive sleep apnea in which electrical stimulation is applied to the hypoglossal nerve. Nerve branches that control tongue protrusion are located inferiorly. Due to positioning, left-sided implants are typically placed with an inferiorly oriented electrode cuff (L-down) as opposed to superiorly on the right (R-up). In this study, we assess the impact of left- versus right-sided UAS on patient outcomes. STUDY DESIGN: Retrospective cohort study. SETTING: Tertiary Academic Medical Center. METHODS: Patients who underwent UAS implantation between 2016 and 2021 with an L-down or R-up oriented cuff as confirmed by X-ray were included. Data were collected retrospectively. Most recent sleep study variables were used for analysis. RESULTS: A total of 190 patients met the inclusion criteria. The average age was 61.0 ± 11.0 years, with 55 (28.9%) females. L-down orientation was present in 21 (11.1%) patients vs 169 (88.9%) R-up. Indications for L-down included hunting/shooting (n = 15), prior radiation/surgery (n = 4), central port (n = 1), and brachial plexus injury (n = 1). Adherence was higher among L-down patients (47.1 vs 41.0 hours use/week, P = .037) in univariate analysis, with a similar time to adherence data collection (4.4 vs 4.2 months, P = .612), though this finding was not maintained in the multivariate regression analysis. Decrease in apnea-hypopnea index (21.3 vs 22.8, P = .734), treatment success (76.5% vs 84.0%, P = .665), functional threshold (1.5 vs 1.6, P = .550), therapeutic amplitude (2.3 vs 2.4, P = .882), and decrease in Epworth Sleepiness Scale (4.9 vs 2.6, P = .060) were not significantly different between cohorts. CONCLUSION: This study is the first to examine the orientation of the UAS electrode cuff concerning the electrodes' natural position and the potential effect on postoperative outcomes. Our study found no significantly different treatment outcomes between the L-down versus R-up cohort, with the exception of device adherence, which was significantly higher in the L-down group on univariate analysis though not on multivariate analysis. Future studies with larger patient cohorts are needed to further investigate this potential relationship between treatment outcomes and electrode cuff orientation.

Long-term trends in body mass index throughout upper airway stimulation treatment: does body mass index matter?

STUDY OBJECTIVES: Upper airway stimulation is a surgical option for patients with obstructive sleep apnea who fail other forms of noninvasive treatment. Current guidelines recommend a baseline body mass index (BMI) below 32 kg/m2 for eligibility. In this study, we identify trends in BMI before and after upper airway stimulation to characterize the influence of BMI on treatment success. METHODS: Patients underwent upper airway stimulation implantation between 2016 and 2021. Sleep study data were collected from preoperative and most recent postoperative sleep study. BMI data were collected and compared across the following time points: preoperative sleep study (BMI-1), initial surgeon consultation (BMI-2), surgery (BMI-3), titration polysomnogram (BMI-4), and second postoperative sleep study (BMI-5). Patients were categorized into groups (BMI ≥32 [BMI32], 25 ≤ BMI <32 [BMI25], BMI <25 [BMI18]) based BMI-1, and clinical outcomes were compared. RESULTS: 253 patients were included. The BMI32 group showed a significant decrease in BMI between BMI-1 and BMI-3 (33.9 vs 32.2; P < .001) and a significant increase in BMI between BMI-3 and BMI-5 (32.2 vs 33.0; P = .047). Apnea-hypopnea index improvement and treatment success rate were not significantly different between groups. On univariate and multivariable logistic regression, a lower BMI-5 was significantly predictive of treatment success (odds ratio: 0.88; 95% confidence interval: 0.79-0.97; P = .016). BMI-5 was also significantly associated with improvement in apnea-hypopnea index (P = .002). Other BMI time points were not associated with measures of treatment success. CONCLUSIONS: Reduced BMI after upper airway stimulation implantation, as opposed to baseline BMI, predicted treatment success. These findings may guide patient counseling, with implications for long-term adherence and therapy success. CITATION: Renslo B, Virgen CG, Sawaf T, et al. Long-term trends in body mass index throughout upper airway stimulation treatment: does body mass index matter? J Clin Sleep Med. 2023;19(6):1061-1071.

Analysis of Imaging Results for Semisitting Compared with Supine Positioning in the Retrosigmoid Approach for Resection of Cerebellopontine Angle Vestibular Schwannomas.

OBJECTIVE: To compare the completeness of resection of vestibular schwannomas using three-dimensional segmented volumetric analysis of pre- and postoperative magnetic resonance imaging (MRI) of patients undergoing supine and semisitting positioning for the retrosigmoid approach. STUDY DESIGN: Retrospective chart review. SETTING: Tertiary medical center. PATIENTS: Patients with vestibular schwannomas undergoing surgical resection via the retrosigmoid approach. INTERVENTIONS: Tumor resection via the retrosigmoid approach with different patient positioning: standard supine versus semisitting. MAIN OUTCOME MEASURES: Preoperative versus postoperative three-dimensional segmented volumetric MRI analysis of vestibular schwannomas. RESULTS: A total of 43 patients (15 supine and 28 semisitting) underwent retrosigmoid craniotomy for resection of vestibular schwannomas. For the conventional supine and semisitting positioning, mean preoperative tumor volumes were 12.65 and 8.73 cm 3 ( p = 0.15), respectively. Postoperative mean tumor volumes for the supine and semisitting positions were 2.09 and 0.48 cm 3 ( p = 0.13), respectively. There were 11 cases of postoperative sigmoid sinus thrombosis, 3 in the conventional supine group and 8 in the semisitting groups, and there were 6 cases of postoperative cerebrospinal fluid leaks, all in the semisitting group. The mean House-Brackmann scores for the supine and semisitting groups were 2.9 and 2.3, respectively. There was no statistically significant difference between groups in the rates of these or any other postoperative complications. CONCLUSIONS: The semisitting position for the suboccipital retrosigmoid approach for vestibular schwannoma resection does not compromise the ability to adequately resect the tumor as seen by volumetric MRI results. Further studies are needed to establish the safety of this position compared with the traditional supine approach.

In Silico Localization of Perilymph Proteins Enriched in Menier̀e Disease Using Mammalian Cochlear Single-cell Transcriptomics.

Hypothesis: Proteins enriched in the perilymph proteome of Menier̀e disease (MD) patients may identify affected cell types. Utilizing single-cell transcriptome datasets from the mammalian cochlea, we hypothesize that these enriched perilymph proteins can be localized to specific cochlear cell types. Background: The limited understanding of human inner ear pathologies and their associated biomolecular variations hinder efforts to develop disease-specific diagnostics and therapeutics. Perilymph sampling and analysis is now enabling further characterization of the cochlear microenvironment. Recently, enriched inner ear protein expression has been demonstrated in patients with MD compared to patients with other inner ear diseases. Localizing expression of these proteins to cochlear cell types can further our knowledge of potential disease pathways and subsequent development of targeted therapeutics. Methods: We compiled previously published data regarding differential perilymph proteome profiles amongst patients with MD, otosclerosis, enlarged vestibular aqueduct, sudden hearing loss, and hearing loss of undefined etiology (controls). Enriched proteins in MD were cross-referenced against published single-cell/single-nucleus RNA-sequencing datasets to localize gene expression to specific cochlear cell types. Results: In silico analysis of single-cell transcriptomic datasets demonstrates enrichment of a unique group of perilymph proteins associated with MD in a variety of intracochlear cells, and some exogeneous hematologic and immune effector cells. This suggests that these cell types may play an important role in the pathology associated with late MD, suggesting potential future areas of investigation for MD pathophysiology and treatment. Conclusions: Perilymph proteins enriched in MD are expressed by specific cochlear cell types based on in silico localization, potentially facilitating development of disease-specific diagnostic markers and therapeutics.

Olfactory, Auditory, and Vestibular Performance: Multisensory Impairment Is Significantly Associated With Incident Cognitive Impairment.

Background: Dysfunction in the olfactory, auditory, and vestibular systems are commonly seen in aging and are associated with dementia. The impact of sensory loss(es) on cognition is not well understood. Our aim was to assess the relationships between performance on objective multisensory testing and quantify the impact of dysfunction on cognition. Methods: Patients presenting with subjective hearing loss presenting to a tertiary care otologic/audiologic clinic were identified and underwent multisensory testing using the Affordable, Rapid Olfactory Measurement Array (AROMA), pure tone audiometric evaluations, and the Timed "Up and Go" test. Cognitive impairment (CI) was assessed via the Montreal Cognitive Assessment (MoCA) was also administered. Key Results: 180 patients were enrolled. Thirty one percentage (n = 57) screened positive for cognitive impairment. When evaluating single sensory impairments, we found that olfactory dysfunction, gait impairment, and sensorineural hearing loss were all statistically significantly (p < 0.05) associated with a higher risk of cognitive impairment (ORs 3.89, 3.49, and 2.78, respectively) for CI. Multisensory impairment was significantly associated with cognitive impairment. Subjects with dysfunction in all domains were at the highest risk for cognitive impairment (OR 15.7, p < 0.001) vs. those with impairment in 2 domains (OR 5.32, p < 0.001). Conclusion: Dysfunction of the olfactory, auditory, and vestibular systems is associated with a significantly increased risk of CI. The dramatically increased risk of CI with multisensory dysfunction in all three systems indicated that MSD may synergistically contribute to CI.

Isolation of sensory hair cell specific exosomes in human perilymph.

Evaluation of hearing loss patients using clinical audiometry has been unable to give a definitive cellular or molecular diagnosis, hampering the development of treatments of sensorineural hearing loss. However, biopsy of inner ear tissue without losing residual hearing function for pathologic diagnosis is extremely challenging. In a clinical setting, perilymph can be accessed, potentially allowing the development of fluid based diagnostic tests. Recent approaches to improving inner ear diagnostics have been focusing on the evaluation of the proteomic or miRNA profiles of perilymph. Inspired by recent characterization and classification of many neurodegenerative diseases using exosomes which not only are produced in locally in diseased tissue but are transported beyond the blood brain barrier, we demonstrate the isolation of human inner ear specific exosomes using a novel ultrasensitive immunomagnetic nano pom-poms capture-release approach. Using perilymph samples harvested from surgical procedures, we were able to isolate exosomes from sensorineural hearing loss patients in only 2-5 µL of perilymph. By isolating sensory hair cell derived exosomes through their expression level of myosin VIIa, we for the first-time sample material from hair cells in the living human inner ear. This work sets up the first demonstration of immunomagnetic capture-release nano pom-pom isolated exosomes for liquid biopsy diagnosis of sensorineural hearing loss. With the ability to isolate exosomes derived from different cell types for molecular characterization, this method also can be developed for analyzing exosomal biomarkers from more accessible patient tissue fluids such as plasma.

Anatomy and physiology of the palatine tonsils, adenoids, and lingual tonsils.

OBJECTIVE: This review aims to discuss the basic anatomy and physiology of the palatine and pharyngeal tonsils, with reference to how this foundational understanding may affect patient management and surgical procedures in these regions of the upper airway. METHODS: A literature search was performed using PubMed and Google Scholar using the MeSH terms tonsils, adenoids, anatomy, physiology, and adenotonsillectomy. Primary sources were excluded if they were abstracts only, non-English language, or non-human studies. Thirty-five sources were included in this review. RESULTS AND CONCLUSIONS: The pharyngeal and palatine tonsils are compact yet physiologically complex mucosa-associated lymphoid tissues that make up a portion of Waldeyer's ring. As part of the mucosal immune system, these structures function in exogenous antigen sampling and stimulation of immune responses. Aberrant immune activation and/or regulation can lead to a myriad of pathologies, with adenotonsillar hypertrophy, chronic tonsillitis/adenoiditis, and recurrent otitis media among the most commonly encountered conditions by otolaryngologists. While the pathophysiology of these conditions is still incompletely understood, current evidence and future investigations may reveal patterns amenable to targeted medical management. When medical management fails, tonsillectomy and/or adenoidectomy may be indicated for patient care. Though routine procedures, the execution of tonsil and/or adenoid removal requires a thorough understanding of the anatomy of these lymphoepithelial organs so as to minimize the risk for rare serious complications that can occur.

Ethical Considerations in the Advent of Artificial Intelligence in Otolaryngology.

Artificial intelligence (AI) is quickly expanding within the sphere of health care, offering the potential to enhance the efficiency of care delivery, diminish costs, and reduce diagnostic and therapeutic errors. As the field of otolaryngology also explores use of AI technology in patient care, a number of ethical questions warrant attention prior to widespread implementation of AI. This commentary poses many of these ethical questions for consideration by the otolaryngologist specifically, using the 4 pillars of medical ethics-autonomy, beneficence, nonmaleficence, and justice-as a framework and advocating both for the assistive role of AI in health care and for the shared decision-making, empathic approach to patient care.

Patient values regarding overlapping surgery: Identification of distinct patient subgroups.

OBJECTIVES/HYPOTHESIS: To explore patient values associated with their comfort level with surgical trainees and attending surgeon absence from the operating room. STUDY DESIGN: Qualitative interviews with general medical patients. METHODS: We analyzed data from qualitative interviews with patients that included a quantitative rating on a visual analog scale (VAS) of comfort consenting to three surgical scenarios, including overlapping surgery, to identify subgroups of patients based on comfort level. After identifying subgroups, we compared qualitative responses from participants who were generally comfortable with overlapping surgery to those who were uncomfortable to identify themes associated with these perceptions. RESULTS: We identified three subgroups of patients based on the patterns of VAS responses. Participants who were comfortable with overlapping surgery expressed trust in the surgeon and delegation process. Those who were most uncomfortable expressed a strong desire to know who was operating on them, and a desire for control over their surgical process. Subjects uncomfortable with overlapping surgery were also generally not sensitive to tradeoffs (cost, timing). CONCLUSIONS: We identified distinct subgroups of patients based on their comfort level with trainee independence and primary attending availability. By examining the predominant values in these subgroups, we identified potential explanations for patient discomfort with attending absence. Strategies to enhance patients' knowledge about the process of surgery and a sense of control over their own care may improve comfort with trainee participation and overlapping surgery. LEVEL OF EVIDENCE: 6 Laryngoscope, 2019.

Patient opinions regarding surgeon presence, trainee participation, and overlapping surgery.

OBJECTIVES: To explore patient opinions and underlying values regarding overlapping surgery (OS) scenarios, specifically evaluating the effect of attending surgeon presence and availability, as well as trainee participation on patient comfort level and willingness to consent. STUDY DESIGN: Mixed methods. METHODS: Forty adults participated in semi-structured interviews. Interviews included vignettes involving three scenarios of OS (1: attending present; 2: attending absent for wound closure; 3: attending absent and unavailable for wound closure, with covering attending), visual analog scale ratings of participants' comfort with scenarios, and cognitive debriefing. Themes and subthemes were identified using hierarchical coding of transcripts, and quantitative and qualitative analyses were conducted. RESULTS: Quantitative analysis revealed anticipated decreases in comfort with decreasing attending presence/availability (mean comfort level 94% vs. 78% vs. 63% for scenarios 1 vs. 2 vs. 3, P < 0.005), although many patients reported improved comfort with scenario 3 if meeting the covering attending. Participants demonstrated a preference for less trainee involvement (P < 0.005, scenario 1) and greater trainee experience (P < 0.05, all scenarios). However, not all individuals were uncomfortable with attending absence or trainee independence. Themes important for decision making included trust in the surgeon, surgeon experience, trainee involvement, disease severity, cost, and wait time. CONCLUSION: Patients varied highly in their willingness to consent to OS scenarios. In settings of trainee independence and covering surgeons, many patients desired meeting these members of the treatment team, which improved comfort for some. For some patients, tradeoffs and incentives of timeliness, cost, and convenience modified their willingness to have OS. LEVEL OF EVIDENCE: 4 Laryngoscope, 129:1337-1346, 2019.

Respiratory events after adenotonsillectomy requiring escalated admission status in children with obstructive sleep apnea.

OBJECTIVES: To characterize postoperative respiratory complications following adenotonsillectomy (AT) in children with obstructive sleep apnea (OSA) and to identify variables associated with pediatric intensive care unit (PICU) admission. METHODS: Retrospective analysis of 133 pediatric OSA patients with prior AT. Assessment of the postoperative hospital course informed patient stratification based on respiratory event severity, PICU admission status, and unscheduled escalation of care. RESULTS: Thirty-six (26.8%) patients were admitted to the PICU. Compared to non-PICU admissions, these patients were significantly younger and with greater preoperative apnea-hypopnea indices, comorbidities, and percentage of post-anesthesia care unit (PACU) time requiring supplemental oxygen. Seventy-one respiratory events occurred in 59 patients, with 60.6% affecting PICU patients. Fifteen severe events occurred, affecting 31% of PICU patients. Of 14 unscheduled escalations of care, 7 were PICU admissions who, compared to planned PICU admissions, spent significantly more time in the PACU and exhibited a trend towards greater PACU time on supplemental oxygen. CONCLUSIONS: Pediatric patients requiring post-AT PICU care have more risk factors for respiratory compromise. Total PACU time and total PACU time requiring supplemental oxygen may indicate patient risk for postoperative respiratory complications and need for intensive care. Future work includes prospective determination of appropriate post-AT PICU admission.

Post-tonsillectomy hemorrhagic outcomes in children with bleeding disorders at a single institution.

OBJECTIVE: To report on the post-tonsillectomy bleeding outcomes and factors associated with hemorrhage among children with pre- or post-operatively diagnosed bleeding disorders treated with an institutional protocol. METHODS: Retrospective cohort study of patients with hematologic disorders who underwent tonsillectomy between 2003 and 2016 and were treated with perioperative desmopressin or factor replacement and/or aminocaproic acid. Postoperative outcomes were compared to controls matched for age, sex, and indication for surgery. Analysis of factors associated with hemorrhage was performed in patients with bleeding disorders using Mann-Whitney U or chi-squared tests. RESULTS: 45 patients with hematologic disorders met inclusion criteria. Platelet dysfunction, including von Willebrand Disease (vWD), was the most common diagnosis (77.8%). Most patients had a preoperative diagnosis of a bleeding disorder and received perioperative hematologic medications (86.7%). Compared to matched controls, patients with hematologic disorders experienced more postoperative bleeding (15.5%; 12 bleeds, 7 patients vs. 1.7%; 1 bleed, 1 patient, p = 0.05) and had longer postoperative stays (1.3 days vs. 0.4 days, p < 0.001). Among the patients with hematologic disorders, patients who experienced a postoperative bleed were significantly more likely to have a factor deficiency (e.g. Hemophilia over vWD) and have a postoperative diagnosis (compared to preoperative diagnosis) for which they did not receive perioperative hematologic medication. Of patients with a postoperative bleed, all those diagnosed postoperatively required at least one surgical intervention to control bleeding compared to 33% of patients with a preoperative diagnosis. A history of post-surgical bleeding, male sex, age at surgery, and pharyngitis as surgical indication were not associated with higher hemorrhage rates in this group. CONCLUSIONS: This study suggests a clinically important magnitude of increased bleeding risk in patients with hematologic disease. This risk appears to decrease with the use of an institutional protocol consisting of desmopressin or factor replacement and an antifibrinolytic agent extending through postoperative day 10.