COVID-19-associated anosmia

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Moises Romo M.D.

Synonyms and keywords:anosmia, olfactory dysfunction, SARS-CoV-2, dysgeusia

Overview

Total or parcial loss of olfactory function (anosmia/hyposmia) has been formally recognized as a characteristic symptom of COVID-19 infection, and may be the most common sign of infection due to this virus.[1]

Anosmia may appear without any other symptoms or signs in patients with COVID-19 infection.[2]

The extent of potential olfactory dysfunction due to COVID-19 is still unclear.[3]

Historical Perspective

Classification

  • There is no established system for the classification of COVID-19 associated anosmia.

Pathophysiology

Causes


Differentiating COVID-19-associated anosmia from other Diseases

Epidemiology and Demographics

Prevalence of anosmia in patients with COVID-19[3]
Date of publication Country Author Number of patients Prevalence
March 26, 2020 Italy Giacomelli et al.[22] 59 33.9%
March 27, 2020 Iran Bagheri et al.[23] 10,069 48.23%
April 1, 2020 Italy Vaira et al.[24] 320 19.4%
April 6, 2020 European countries Lechien et al.[25] 417 85.6%
April 7, 2020 United Kingdom Menni et al.[26] 579 59.41%
April 12, 2020 United States Yan et al.[27] 59 68%
April 16, 2020 France Klopfenstein et al.[28] 47 47%
April 17, 2020 Iran Moein et al.[4] 60 98.33%
April 22, 2020 United Kingdom Spinato et al.[29] 202 64.4%
April 22, 2020 Iran Heidari et al.[30] 23 69.57%
April 22, 2020 Spain Beltran-Corbellini et al.[31] 79 31.65%
April 24, 2020 United States Yan et al.[32] 169 75.7%
May 1, 2020 Germany Luers et al.[33] 72 74%
May 1, 2020 Italy Vaira et al.[34] 33 75.8%


Risk Factors

Screening


Natural History, Complications, and Prognosis

Diagnosis

Diagnostic Study of Choice

History and Symptoms

Physical Examination


Laboratory Findings

Electrocardiogram


X-ray


Echocardiography or Ultrasound


CT scan

MRI


Other Imaging Findings


Other Diagnostic Studies


Treatment

Medical Therapy

Surgery


Primary Prevention

Secondary Prevention


References

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  2. 2.0 2.1 2.2 2.3 Hopkins C, Surda P, Kumar N (June 2020). "Presentation of new onset anosmia during the COVID-19 pandemic". Rhinology. 58 (3): 295–298. doi:10.4193/Rhin20.116. PMID 32277751 Check |pmid= value (help).
  3. 3.00 3.01 3.02 3.03 3.04 3.05 3.06 3.07 3.08 3.09 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 3.20 3.21 3.22 Meng X, Deng Y, Dai Z, Meng Z (June 2020). "COVID-19 and anosmia: A review based on up-to-date knowledge". Am J Otolaryngol. 41 (5): 102581. doi:10.1016/j.amjoto.2020.102581. PMC 7265845 Check |pmc= value (help). PMID 32563019 Check |pmid= value (help).
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