Wearing a Mask Doesn't Cause CO2 Poisoning

-- Robert Preidt
HealthDay News

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TUESDAY, Oct. 6, 2020 (HealthDay News) -- Wearing a face mask cannot lead to carbon dioxide poisoning, even in people with lung disease, researchers report.

The findings counter claims that wearing face masks to prevent spread of the new coronavirus may put some people's health at risk.

The authors of the new study assessed changes in oxygen or carbon dioxide levels in healthy people as well as in those with chronic obstructive pulmonary disease (COPD), before and while using surgical masks.

In general, people with COPD must "work harder to breathe," which can lead to shortness of breath and/or a tired feeling, according to the American Thoracic Society.

The study -- published online Oct. 2 in the Annals of the American Thoracic Society -- found "that the effects [of wearing masks] are minimal at most even in people with very severe lung impairment," said lead author Dr. Michael Campos. He's an associate professor in the University of Miami's division of pulmonary, allergy, critical care and sleep medicine.

Campos also addressed the feeling of breathlessness that some healthy people may experience when wearing a mask.

"Dyspnea, the feeling of shortness of breath, felt with masks by some is not synonymous of alterations in gas exchange. It likely occurs from restriction of air flow with the mask in particular when higher ventilation is needed (on exertion)," he said in a society news release.

For example, if you're walking briskly up a hill, you may experience breathlessness, and a mask that is too tight may increase that feeling. The solution: Slow down or remove the mask if you're at a safe distance from other people, Campos advised.

"It is important to inform the public that the discomfort associated with mask use should not lead to unsubstantiated safety concerns as this may attenuate the application of a practice proven to improve public health," the researchers concluded.

"The public should not believe that masks kill," Campos emphasized.

More information

The U.S. Centers for Disease Control and Prevention has more on COVID-19.

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