Postinfectious olfactory loss: A retrospective study on 791 patients

Area of Science:

• Otolaryngology
• Neuroscience
• Olfactory Research

Background:

• Postinfectious olfactory loss is a common cause of smell impairment.
• It significantly impacts patients' quality of life.
• Previous studies had small sample sizes and limited follow-up.

Purpose of the Study:

• To identify prognostic factors for olfactory function recovery in a large cohort.
• To assess recovery rates in patients with postinfectious olfactory disorders.

Main Methods:

• Retrospective analysis of 791 patients with postinfectious olfactory loss.
• Olfactory function assessed using the Sniffin' Sticks test.
• Mean follow-up duration of 1.94 years.

Main Results:

• Smell test scores improved significantly over time.
• Patient age and initial olfactory function (TDI scores) were key predictors of improvement.
• 46% of anosmic and 35% of hyposmic patients showed clinically significant recovery.

Conclusions:

• Recovery of olfactory function is frequent in postinfectious olfactory loss, even years after infection.
• Prognostic factors like age and baseline olfactory scores are identified.
• This study provides robust evidence on recovery potential and influencing factors.