We investigated the structures of the exopolysaccharides (EPSs) produced by Streptococcus thermophilus SFi39 and SFi12. Both polymers were found to have molecular masses of greater than 2 ؋ 10 6 Da. The SFi39 EPS consisted of D-glucose and D-galactose in a molar ratio of 1:1, whereas the SFi12 EPS was composed of D-galactose, L-rhamnose, and D-glucose in a molar ratio of 3:2:1. Methylation analysis of and nuclear magnetic resonance spectra recorded from the native polysaccharide, as well as oligosaccharides released by partial acid hydrolysis, allowed the complete structural determination of the SFi39 EPS, which consists of the following tetrasaccharide repeating unit: ␤-D-Galp1 2 6 33)-␣-D-Glcp-(133)-␤-D-Glcp-(133)-␤-D-Galf-(13 Similar spectra recorded only from the native polysaccharide were sufficient to allow the structural determination of the SFi12 EPS, which consists of the following hexasaccharide repeating unit:

Our objective is to identify novel coronavirus disease 2019 (COVID-19) patients with a diagnosis of sudden sensorineural hearing loss (SSNHL) with an aim to describe possible mechanisms. A systematic review was conducted using PubMed and Google Scholar. Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines were followed . Our search terms included: "Sensorineural Hearing Loss" + "COVID-19" or "Sensorineural Hearing Loss" + "SARS-CoV-2" or "Sensorineural Hearing Loss" + "Coronavirus". Studies that adhered to the inclusion and exclusion criteria were included in the review. Of the 20 articles identified in the initial search, five met the inclusion criteria. The included articles consisted of four case studies and one letter to the editor, with seven total patients analyzed. All patients were COVID-19 positive and exhibited SSNHL, either unilateral or bilateral. Four patients reported tinnitus and two patients experienced vertigo. One patient was treated with hydroxychloroquine and one patient was treated with a variety of medications. Four patients were treated with intravenous and/or oral steroids intended to treat the SSNHL. The current literature describing SSNHL in COVID-19 patients is insufficient to characterize the pattern of hearing loss or advise about the treatment or outcomes. Future studies require a larger database or population study.

Objective A small proportion of children with otitis media develop acute mastoiditis, which has the potential to spread intracranially and result in significant morbidity and mortality. The aim of this study was to evaluate the incidence and management of complications related to pediatric acute mastoiditis using a national database. Study Design Retrospective review of 2016 Kids’ Inpatient Database, part of the Healthcare Cost and Utilization Project. Setting Academic, community, general, and pediatric specialty hospitals in the United States. Methods International Classification of Diseases, Tenth Revision, Clinical Modification code H70.XXX was used to retrieve records for children admitted with a diagnosis of mastoiditis. Data included patient demographics, intracranial infections, procedures (middle ear drainage, mastoidectomy, and intracranial drainage), length of stay (LOS), and total charges. Results In total, 2061 children aged ≤21 years were identified with a diagnosis of acute mastoiditis. Complications included subperiosteal abscess (6.90%), intracranial thrombophlebitis/thrombosis (5.30%), intracranial abscess (3.90%), otitic hydrocephalus (1.20%), encephalitis (0.90%), subperiosteal abscess with intracranial complication (0.60%), petrositis (0.60%), and meningitis (0.30%). Children with intracranial abscesses were more likely ( P < .001) to undergo myringotomy ± ventilation tube insertion (63.7%), mastoidectomy (53.8%), mastoidectomy with ventilation tube or myringotomy (42.5%), intracranial drainage procedure (36.3%), or all 3 key procedures (15.0%). Children with any type of intracranial complication had a significantly longer LOS ( P < .001) and higher total charges ( P < .001). Both a diagnosis of bacterial meningitis and undergoing an intracranial drainage procedure ( P < .001) contributed significantly to LOS and total charges. Conclusion Patients with intracranial complications are more likely to undergo surgical procedures; however, there is still wide variability in practice patterns, illustrating that controversies in the management of otitis media complications persist.

Sinonasal renal cell-like adenocarcinoma (SNRCLA) is a newly defined, rare malignant tumor of the nasal cavity. The clinical course and response to treatment remain uncertain. The purpose of this study is to report a new case of SNRCLA and review the literature to determine clinical characteristics, treatment options, and outcomes. A 26-year-old male presented with headache, epistaxis, and nasal obstruction. Physical examination revealed a tumor involving bilateral ethmoid sinuses and MRI revealed extension through the cribriform plate. Surgical excision with endonasal and a bifrontal craniotomy was performed followed by adjuvant radiotherapy (RT). After RT, the patient had persistent disease requiring salvage surgery. There are few previously reported cases of SNRCLA. A literature review yielded 14 previously reported cases with convincing diagnostic evidence of SNRCLA. Common presenting symptoms were epistaxis and nasal obstruction. Surgical excision was the primary treatment in fourteen cases, nine received RT, and none received chemotherapy. However, three cases had persistent or recurrent disease. Surgical excision is the mainstay of treatment for SNRCLA and adjuvant RT has been used in some patients with varying outcomes. The tumor is low grade with no reported cases of metastases or death. The best practice for treatment is yet to be determined.

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To understand the use of the flipped classroom (FC)-learning core content prior to an academic session, with class time devoted to applying this content-in otolaryngology residency education. Methods An electronic survey of 107 otolaryngology program directors (PDs), including demographic details, the flipped classroom perception instrument (FCPI), and the otolaryngology programs' current use of FC. Results Forty-four (41%) PDs completed the FCPI. Seventy-one point one (71.1%) of respondents were male, 60% were 30-49 years, and the remainder were older. Sixty-two percent (62%) had fellowships associated with their program, 21.7% of programs used the FC model Very Often, 17.4% Somewhat Often, 28.3% Sometimes, 17.4% Somewhat Rarely, 8.7% Very Rarely, and 6.5% Never. Attitudes toward FC principles were positive with modes "strongly agree" for all, except for "online modules enhance learning" where the mode was "slightly agree" with significantly higher scores for PDs over age 50 than for those younger (4.17 vs. 3.63, p=0.033). There were no other significant differences comparing male vs. female PDs, younger vs. older PDs, smaller vs. larger programs, programs with or without fellowships, programs with 100% vs. <100% board exam pass rates, or programs in different geographical regions. The pre-class activity mean score was 4.34 (95% CI 4.12-4.56) and the in-class mean score was 4.18 (95% CI 3.99-4.37). There was no significant correlation between the likelihood of using a flipped classroom and attitude scores. Conclusion PDs value both the pre-class and interactive in-class principles of FCs but only 37.8% of programs use FC often, suggesting that practical approaches to implementation in this group could improve education in this population.

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