T-piece gas flow palpation as a clinical indicator of endotracheal intubation in neonates.

We aimed to determine if providers could detect simulated spontaneous respirations of an intubated neonate by palpating gas flow changes at the positive end expiratory pressure valve of a T-piece resuscitation device in an in vitro setting. We also aimed to demonstrate whether the sensitivity of this methodology was related to the exhaled tidal volumes and/or the gas flow settings on the resuscitation device. A T-piece resuscitator (Neopuff®) circuit was connected to a neonatal silicon test lung. Expiratory tidal volumes of 5, 10 and 15 ml were provided via the test lung, with the Neopuff® set at gas flow rates of 5, 10 and 15 L/min. Physician volunteers were asked to identify whether they could detect expiratory gas from the test lung at the circuit T-piece with the volar surface of their wrist, at different tidal volumes and gas flows. Ten doctors detected 315 of 450 expirations; 95, 73 and 42 % of tidal volumes of 15, 10 and 5 ml, respectively, were detected with an overall positive predictive value of 98.7 %. Detection of exhalations was similar at different gas flow rates for each tidal volume. No exhalations were detected at zero gas flow. We concluded that T-piece gas flow palpation may be a useful and previously unreported clinical sign, which may help to reassure clinicians that they have successfully intubated the trachea. As with any clinical sign, it should not be considered in isolation but within the context of the clinical picture.