Objective: The pathophysiology of idiopathic sudden sensorineural hearing loss (SSNHL) is poorly understood. This study aimed to explore the association of migraine and risk of SSNHL in a meta-analysis of population-based cohort studies. Methods: A systematic literature search of studies published until December 2019 was carried out in Medline, Embase, Scopus, Web of Science, and Google Scholar using appropriate keywords. References of the retrieved articles were also examined for inclusion. Random-effects meta-analysis was performed by calculating pooled hazard ratio (HR) and associated 95% confidence interval (CI) using the DerSimonian and Laird method while considering conceptual heterogeneity. Results: Three eligible cohort studies, with 282 250 participants, were included. In total, 56 450 had migraine, and 225 800 had no migraine. Of those with migraine, 0.88% had SSNHL, and among those without migraine, 0.59% had SSNHL. Pooled HR for the risk of SSNHL was 1.84 (95% CI: 1.11-2.57; P < .001). In cohort studies on females, migraine was not significantly the risk of SSHL than no migraine. However, in male cohort studies, the migraine had a higher risk of SSHL than no

Objectives: This study investigated the relationship between viral load and the incidence of olfactory and gustatory dysfunction (OD and GD), the incidence of respiratory and gastrointestinal symptoms and the recovery of OD and GD in COVID-19 patients.Design: A retrospective cohort study. Setting and Participants:This study was conducted on 599 outpatients' cases in Golestan province between February and June 2020. Main Outcome Measures:The incidence, severity (complete or partial) and recovery time of OD and GD and their associations with cycle threshold (CT) values of SARS-CoV-2 polymerase chain reaction were assessed. Results:The mean age of patients was 38.27 ± 13.62 years. The incidence of general symptoms included myalgia 70.1%, headache 51.8%, fever 47.7% and dyspnoea 21.4%. 41.9% of patients had gastrointestinal symptoms, including abdominal pain 26.5%, diarrhoea 25.2%, nausea 20.5% and vomiting 12.9%. 12.2% of patients had comorbidity. The trimester recovery rates of OD and GD were 93.94% and 94.74% respectively.The mean recovery time of OD and GD was 14.56 ± 13.37 and 13.8 ± 3.77 days respectively. The mean CT value in all patients was 27.45 ± 4.55. There were significant associations between the mean of CT value with headache (p = 0.04), GD (p = 0.002) and OD (p = 0.001). Conclusions:The finding of this study indicates a possible association between viral load with incidence of OD and GD in COVID-19 patient's cases and assures the recovery of OD/GD in these patients.

Objectives To investigate whether a possible association of mobile phone use with hearing impairment was conducted a systematic review and meta-analysis. Content This is a systematic review and meta-analysis. A comprehensive literature search was carried out based on the Meta-analysis of Observational Studies in Epidemiology (MOOSE) methodology using PubMed, Scopus, Web of Science, OVID, and Cochrane. The Robins-I tool was used for quality assessment and risk of bias. Two investigators independently reviewed all articles. Pooled effect size was calculated and meta-analysis was performed to compute an overall effect size. Summary Overall, five relevant studies (two cross-sectional and three cohort studies) with 92,978 participants were included in the analysis. The studies were stratified by design, there was no significant association between mobile phone use and hearing impairment in cross-sectional studies (OR=0.94, 95% CI=0.57–1.31) and cohort studies (OR=1.09, 95% CI=0.93–1.25). In addition, the effect estimates did not differ significantly between cross-sectional and cohort studies (Q=0.50, p=0.48). Overall, the pooled odds ratio (OR) of hearing impairment was 1.07 (95% CI: 0.94–1.20), which indicates no significant association between mobile phone use and hearing impairment. Outlook Our findings indicate no association between mobile phone use and hearing impairment. However, these findings must be interpreted with caution.