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Olfactory Receptors: Location and Structure01:03

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The process of olfaction, also known as the sense of smell, is a sophisticated chemical response system. The specialized sensory neurons that facilitate this process, known as olfactory receptor neurons, are situated in an upper segment of the nasal cavity, known as the olfactory epithelium. Olfactory sensory neurons are bipolar, with their dendrites extending from the epithelium's apex into the mucus that lines the nasal cavity. Airborne molecules, when inhaled, traverse the olfactory...
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Humans detect odors with the help of specialized cells located in the upper part of the nasal cavity, called olfactory receptor neurons (ORNs). ORNs possess hair-like structures called cilia, which are receptive to sensations from the inhaled air. When an odorant molecule binds to a specific receptor on the cell of the cilia, it leads to a series of events that ultimately cause the ORN to send electrical signals to the olfactory bulb in the brain through the olfactory nerves.
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Olfaction01:25

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The sense of smell is achieved through the activities of the olfactory system. It starts when an airborne odorant enters the nasal cavity and reaches olfactory epithelium (OE). The OE is protected by a thin layer of mucus, which also serves the purpose of dissolving more complex compounds into simpler chemical odorants. The size of the OE and the density of sensory neurons varies among species; in humans, the OE is only about 9-10 cm2.
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Chronic obstructive pulmonary disease (COPD) is a group of lung conditions that progressively worsen over time, including chronic bronchitis and emphysema. This cluster of diseases collectively leads to a gradual and irreversible decline in lung function over time.
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Evaluation of olfactory dysfunction persistence after COVID-19: a prospective study.

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COVID-19 survivors often experience persistent olfactory dysfunction. Longer SARS-CoV-2 infection duration is linked to a reduced recovery of the sense of smell, impacting quality of life.

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Area of Science:

  • Otorhinolaryngology
  • Infectious Diseases
  • Neurology

Background:

  • Olfactory dysfunction is a common early symptom of COVID-19.
  • The duration and persistence of smell loss post-infection vary significantly among patients.

Purpose of the Study:

  • To assess the persistence of olfactory dysfunction after COVID-19 recovery.
  • To identify clinical and demographic factors associated with persistent olfactory loss.

Main Methods:

  • Study included 76 patients with prior COVID-19 and olfactory dysfunction.
  • Subjective olfactory function assessed using a visual analogic scale (VAS).
  • Objective olfactory function evaluated using the Sniffin' Sticks test.

Main Results:

  • 63.16% of patients were normosmic, 34.21% hyposmic, and 2.63% anosmic post-COVID-19.
  • Most olfactory recovery occurred within two months, but 22.2% had persistent alterations at 4-6 months.
  • Longer SARS-CoV-2 positivity duration (36.07 days) correlated with non-recovery compared to fully recovered patients (29 days).

Conclusions:

  • The duration of SARS-CoV-2 infection negatively impacts olfactory function recovery.
  • Persistent olfactory dysfunction affects a significant minority of COVID-19 survivors.
  • Early intervention and understanding risk factors are crucial for managing post-COVID olfactory loss.