OBJECTIVES/HYPOTHESIS: Postinfectious olfactory loss is among the most common causes of olfactory impairment and has substantial negative impact on patients' quality of life. Recovery rates have been shown to spontaneously improve in most of patients, usually within 2 to 3 years. However, existing studies are limited by small sample sizes and short follow-up. We aimed to assess the prognostic factors for recovery in a large sample of 791 patients with postinfectious olfactory disorders. STUDY DESIGN: Retrospective cohort. METHODS: We performed a retrospective analysis of 791 patients with postinfectious olfactory loss. Olfactory functions were assessed using the Sniffin' Sticks test at the first and final visits (mean follow-up = 1.94 years). RESULTS: Smell test scores improved over time. In particular, patient's age and the odor threshold (T), odor discrimination (D), and odor identification (I) (TDI) score at first visit were significant predictors of the extent of change. The percentage of anosmic and hyposmic patients exhibiting clinically significant improvement was 46% and 35%, respectively. CONCLUSIONS: This study provides new evidence within the postinfectious olfactory loss literature, shedding light on the prognostic factors and showing that recovery of olfactory function is very frequent, even many years after the infection. LEVEL OF EVIDENCE: 4. Laryngoscope, 128:10-15, 2018.
OBJECTIVES/HYPOTHESIS: Postinfectious olfactory loss is among the most common causes of olfactory impairment and has substantial negative impact on patients' quality of life. Recovery rates have been shown to spontaneously improve in most of patients, usually within 2 to 3 years. However, existing studies are limited by small sample sizes and short follow-up. We aimed to assess the prognostic factors for recovery in a large sample of 791 patients with postinfectious olfactory disorders. STUDY DESIGN: Retrospective cohort. METHODS: We performed a retrospective analysis of 791 patients with postinfectious olfactory loss. Olfactory functions were assessed using the Sniffin' Sticks test at the first and final visits (mean follow-up = 1.94 years). RESULTS: Smell test scores improved over time. In particular, patient's age and the odor threshold (T), odor discrimination (D), and odor identification (I) (TDI) score at first visit were significant predictors of the extent of change. The percentage of anosmic and hyposmic patients exhibiting clinically significant improvement was 46% and 35%, respectively. CONCLUSIONS: This study provides new evidence within the postinfectious olfactory loss literature, shedding light on the prognostic factors and showing that recovery of olfactory function is very frequent, even many years after the infection. LEVEL OF EVIDENCE: 4. Laryngoscope, 128:10-15, 2018.
Authors: Carol H Yan; Aakanksha Rathor; Kaelyn Krook; Yifei Ma; Melissa R Rotella; Robert L Dodd; Peter H Hwang; Jayakar V Nayak; Nelson M Oyesiku; John M DelGaudio; Joshua M Levy; Justin Wise; Sarah K Wise; Zara M Patel Journal: Neurosurgery Date: 2020-08-01 Impact factor: 4.654
Authors: Robert Pellegrino; Joel D Mainland; Christine E Kelly; Jane K Parker; Thomas Hummel Journal: Chem Senses Date: 2021-01-01 Impact factor: 3.160
Authors: Deusdedit Brandão Neto; Marco Aurélio Fornazieri; Caroline Dib; Renata Cantisani Di Francesco; Richard L Doty; Richard Louis Voegels; Fabio de Rezende Pinna Journal: Otolaryngol Head Neck Surg Date: 2020-09-01 Impact factor: 3.497