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As almost two-thirds of patients with COVID-19 infection may suffer from olfactory dysfunction, the authors of this study surveyed 751 patients with the syndrome. They report that the mean duration of olfactory dysfunction in patients who had completely recovered was 10 days, with a range of 3 to 31 days, and it was about 12 days, with a range of 7 to 35 days, in those who had partially recovered. At a follow-up time of approximately 6 to 7 weeks, about one-third of patients still reported symptoms.
Because this disease is new, large follow-up studies to show common patterns of symptom recovery are useful when counseling patients.
– Omar Iqbal Khan, MD
This abstract is available on the publisher's site.
Post-viral olfactory dysfunction is well established and has been shown to be a key symptom of COVID-19 with more than 66% of European and US patients reporting some degree of loss of smell. Persistent olfactory dysfunction appears to be commonplace and will drive the demand for general practitioner, otolaryngology or neurology consultation in the next few months - evidence regarding recovery will be essential in counselling our patients.
This was a prospective survey-based data collection and telemedicine follow-up.
In total, 751 patients completed the study, of whom 477 were females and 274 males. The mean age of the patients was 41 ± 13 years (range 18-60). There were 621 patients (83%) who subjectively reported a total loss of smell and 130 (17%) a partial loss. After a mean follow-up of 47 ± 7 days (range 30-71) from the first consultation, 277 (37%) patients still reported a persistent subjective loss of smell, 107 (14%) reported partial recovery and 367 (49%) reported complete recovery. The mean duration of the olfactory dysfunction was 10 ± 6 days (range 3-31) in those patients who completely recovered and 12 ± 8 days (range 7-35) in those patients who partially recovered.
According to our results, at this relatively early point in the pandemic, subjective patterns of recovery of olfactory dysfunction in COVID-19 patients are valuable for our patients, for hypothesis generation and for treatment development.