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Study Sheds Light On Explanation For Lack Of Blood Oxygenation Detected In Many COVID-19 Patients

Patients suffering this phenomenon, the causes of which are still unknown, have severe pneumonia with markedly decreased arterial blood oxygen levels (known as hypoxemia)

Study Sheds Light On Explanation For Lack Of Blood Oxygenation Detected In Many COVID-19 Patients
Highlights
  • Decreased arterial blood oxygen levels is known as hypoxemia
  • COVID-19 patients with silent hypoxemia often suffer a sudden imbalance
  • Normally individuals with hypoxemia report a feeling of shortness of breath

Washington: One of the physiopathological characteristics of COVID-19 that has most baffled the scientific and medical community is what is known as “silent hypoxemia” or “happy hypoxia”. A recent study sheds light on the explanation for the lack of blood oxygenation detected in many COVID-19 patients. The study was published in the journal function. Patients suffering this phenomenon, the causes of which are still unknown, have severe pneumonia with markedly decreased arterial blood oxygen levels (known as hypoxemia). However, they do not report dyspnea (subjective feeling of shortness of breath) or increased breathing rates, which are usually characteristic symptoms of people with hypoxemia from pneumonia or any other cause.

Also Read: Researchers Find Three Reasons Behind Coronavirus Causing Silent Hypoxia

Patients with “silent hypoxemia” often suffer a sudden imbalance, reaching a critical state that can be fatal. Normally, individuals (healthy or sick) with hypoxemia report a feeling of shortness of breath and a higher breathing rate, thus increasing the body’s uptake of oxygen. This reflex mechanism depends on the carotid bodies. These small organs, located on either side of the neck next to the carotid artery, detect the drop in blood oxygen and send signals to the brain to stimulate the respiratory centre.

Also Read: Coronavirus Outbreak Explained: What Is A Pulse Oximeter And Why Is It Becoming A Tool Against COVID-19?

A group of researchers from the Seville Institute of Biomedicine – IBiS/University Hospitals Virgen del Rocio y Macarena/CSIC/the University of Seville, led by Dr Javier Villadiego, Dr Juan Jose Toledo-Aral and Dr Jose Lopez-Barneo, specialists in the physiopathological study of the carotid body, have suggested in the journal Function, that “silent hypoxemia” in COVID-19 cases could be caused by this organ being infected by the coronavirus (SARS-CoV-2).

Also Read: Coronavirus Outbreak Explained: What Is A Cytokine Storm And How Is It Fuelling COVID-19? Experts Answer

This hypothesis, which has attracted the interest of the scientific community for its novelty and possible therapeutic significance, comes from experiments that have revealed a high presence of the enzyme ECA2, the protein the coronavirus uses to infect human cells, in the carotid body. In patients with COVID-19, the coronavirus circulates in the blood. Therefore, researchers suggest that infection of the human carotid body by SARS-CoV-2 in the early stages of the disease could alter its ability to detect blood oxygen levels, resulting in an inability to “notice” the drop in oxygen in the arteries. If this hypothesis, which is currently being tested in new experimental models, is confirmed, this would justify the use of activators of the carotid body independent of the oxygen sensing mechanism as respiratory stimulants in patients with COVID-19.

Also Read: People With Severe COVID-19, Secondary Blood Infections May Have Worse Health Outcomes: Study

(Except for the headline, this story has not been edited by NDTV staff and is published from a syndicated feed.)

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