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. 2020 May 22:10.1097/ALN.0000000000003410. doi: 10.1097/ALN.0000000000003410

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Copyright © 2020, the American Society of Anesthesiologists, Inc. All Rights Reserved

This article is made available via the PMC Open Access Subset for unrestricted re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for the duration of the COVID-19 pandemic or until permissions are revoked in writing. Upon expiration of these permissions, PMC is granted a perpetual license to make this article available via PMC and Europe PMC, consistent with existing copyright protections.

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Fig. 1. — Shared ventilation circuit diagram. Selected circuit components highlighting inclusion of, for each circuit: (1) inspiratory and expiratory limb one-way valves, (2) bacterial/viral filters (protection for ventilator and shared patient), (3) end-tidal carbon dioxide (ETco₂) and/or tidal volume (V_T) monitoring on patient side of circuit wye, (4) heat and moisture exchange filters, and (5) airway pressure monitoring, using a dry pressure transducer directly connected (no tubing) to a side-stream Luer lock port (gas sampling port) on patient side of heat and moisture exchange filters, if possible, which allows detection of diminished airway pressures if heat and moisture exchange filters saturate and add resistance.