Journal Information
Vol. 57. Issue 6.
Pages 434 (June 2021)
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Vol. 57. Issue 6.
Pages 434 (June 2021)
Clinical Image
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Dead Space Volume in N95 Masks
Espacio muerto en una máscara N95
Santiago C. Arce
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Corresponding author.
, Fernando Chiodetti, Eduardo L. De Vito
Instituto de Investigaciones Médicas A. Lanari, University of Buenos Aires, Argentina
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A health-worker's CT scan showing the air space between the mask (3M Aura 1870+) and the face skin (138mL). This volume remains relatively constant throughout the respiratory cycle, since its shape and material confers certain rigidity (fig. 1). Dead space of the respiratory airways is increased by about 50–80%, compensated with a raise in pulmonary ventilation to keep alveolar ventilation and CO2 stable1. This could have an impact in severely impaired respiratory patients.

Fig. 1


W.C. Hinds, P. Bellin.
The effect of respirator dead space and lung retention on exposure estimates.
Am Ind Hyg Assoc J, 54 (1993), pp. 711-722
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