الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
Sudden Sensorineural Hearing Loss (SSNHL) is a suddenly appearing hearing loss of at least 30 dB in three sequential frequencies in the standard pure tone audiogram, over 72 hours or less. SSNHL is considered one of the few otology emergencies, and although some patients have a complete or partial spontaneous recovery, 32% to 65% of patients do not recover.
Neutrophil-to-lymphocyte ratio (NLR) has emerged as a marker for degree of inflammation; as a high level of NLR may indicate a high level of inflammation. as well as Many studies have reported that the NLR may be a prognostic parameter in cardiovascular diseases, cancers, renal disease, Alzheimer’s disease and other inflammatory diseases.
We followed the PRISMA statement guidelines during this systematic review preparation and performed all steps according to the Cochrane handbook of systematic reviews of intervention
We obtained data from text, tables, figures (using graph grabber version 2.0), and supplementary data. We focused on the following data:
Gender, age, duration of sudden sensorineural hearing loss, neutrophil-to-lymphocyte ratio, its cut off value, sensitivitiy and specificity.
The initial search resulted in 414 articles from three databases: 496 articles from Google Scholar, web of science= 9, Scopus= 3, 6 articles from PubMed and 45 from Science Direct. Of these 414 articles. We excluded 320 articles due to duplication. 94 articles underwent title and abstract screening, and 35 were excluded because they did not meet the inclusion criteria. A total of 18 studies were finally included in this systematic review.
This systematic review was conducted aiming to determine the