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Andrew Bostom, MD, MS
@andrewbostom

"wearing a [surgical] mask [for 5 mins] increase's ETC02 [blood C02] by 7.4% measured by gas capnography. Increased [C02] causes increased cerebral blood flow and induces global gray matter activation changes as in a C02 gas challenge or breath holding"
Effect of wearing a face mask on fMRI BOLD contrast
sciencedirect.com

https://www.sciencedirect.com/science/article/pii/S105381192100029X