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March 2020    Download the Entire Issue (PDF) Vol. 35, No. 3   RSS Feed for Undercurrent Issues
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Those Full-face Snorkeling Masks – More to the Story

from the March, 2020 issue of Undercurrent   Subscribe Now

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Undercurrent needs to go further in explaining the problems of full-face masks, says Max Weinman MD (Atlanta, GA), since there are inherent dangers that we didn't describe in full in our January article.

He wrote, "In physiological terms, any area not involved in gas exchange, that is, the uptake of oxygen and the removal of CO2, is a 'dead-space.' So [danger] is not merely a function of mask fit, but also the volume of dead-space in relation to the relative removal of CO2 by breathing, ventilation, and its production, metabolism. Should one of these factors alter while dead-space is constant, the latter may become increasingly important....


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