SILENT HYPOXEMIA IN PATIENTS WITH COVID-19: NARRATIVE REVIEW
Keywords:
Covid-19, Hypoxia, Dyspnea, Sars-Cov-2, Respiratory SystemAbstract
Introduction: In severe cases of respiratory diseases, low saturation and hypoxemia are expected, which should result in discomfort in breathing, altered level of consciousness or organ failure. However, it was identified several patients with COVID-19 talking normally, using their cell phones and not feeling breath difficulties. This event has been named by doctors as “silent hypoxemia”, and it has become a great mystery to Science. Objetives: Report the existence of silent hypoxemia in COVID-19. Methods: Searches were carried out in the following electronic databases: Scielo, Virtual Health Library, Pubmed, ScienceDirect and Cochrane Library. The descriptors used in the research were COVID-19, silent hypoxemia, happy hypoxia, asymptomatic hypoxemia, apathetic and temporary hypoxemia. Results: The research findings include the entry of SARS-CoV-2 by the Angiotensin-Converting Enzyme 2; damage caused by the virus to central and peripheral chemoreceptors; and inflammation of the Solitary Tract Core. Conclusion: Silent hypoxemia is an important characteristic of COVID-19 that should be observed by healthcare professionals. Its early identification can prevent severe forms of the disease and help the patient's clinical evolution. However, further research is necessary to deepen the knowledge on this topic, establishing its pathophysiology and better conduct for a good prognosis.
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