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The Role of Primary Mitochondrial Disorders in Hearing Impairment: An Overview
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The Role of Primary Mitochondrial Disorders in Hearing Impairment: An Overview
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Journal Article
The Role of Primary Mitochondrial Disorders in Hearing Impairment: An Overview
2023
Overview
Background. Defects of mitochondrial DNA (mtDNA) involved in the function of the mitochondrial electron transport chain can result in primary mitochondrial diseases (PMDs). Various features can influence the phenotypes of different PMDs, with relevant consequences on clinical presentation, including the presence of hearing impairment. This paper aims to describe the hearing loss related to different PMDs, and when possible, their phenotype. Methods. A systematic review was performed according to PRISMA guidelines, searching Medline until December 2022. A total of 485 papers were identified, and based on specified criteria, 7 were included in this study. Results. A total of 759 patients affected by PMDs and hearing loss were included. The age of patients ranged from 2 days to 78 years old, and the male-to-female ratio was 1.3:1. The percentage of subjects affected by hearing loss was 40.8%, (310/759), and in most cases, hearing impairment was described as sensorineural, bilateral, symmetrical, and progressive, with different presentations depending on age and syndrome severity. Conclusions. PMDs are challenging conditions with different clinical phenotypes. Hearing loss, especially when bilateral and progressive, may represent a red flag; its association with other systemic disorders (particularly neuromuscular, ocular, and endocrine) should alert clinicians, and confirmation via genetic testing is mandatory nowadays.
Publisher
MDPI AG,MDPI
Subject
/ Complications and side effects
/ Deafness
/ DNA, Mitochondrial - genetics
/ Female
/ genetics
/ Genomes
/ Hearing Loss, Sensorineural - genetics
/ Humans
/ Male
/ Medical Subject Headings-MeSH
/ Mitochondrial Diseases - complications
/ Mitochondrial Diseases - epidemiology
/ Mitochondrial Diseases - genetics
/ Mutation
/ Review
