Carbon dioxide re‐breathing with close fitting face ...
We measured the end‐tidal carbon dioxide levels in four anaesthetists wearing the same design of mask, before and after performing tracheal intubation on another patient with pulmonary tuberculosis. Measurements were taken by sidestream capnometer (Poet LT, Criticare, Waukesha, WI) using a 15‐mm T‐piece held between the lips.