“…Moreover, improvements in the management of chronic respiratory failure translate into differences in breathing conditions across patients and over time, and this variability is likely to complicate the evaluation of breathing-swallowing interactions. These breathing conditions are now well defined and include spontaneous breathing (SB), (Raphael, Chevret et al 1994), noninvasive mechanical ventilation (NIV) (Bach, Alba et al 1993;Mehta and Hill 2001 (Bach and Alba 1990;Chadda, Louis et al 2002), and tracheostomy with MV (Bach and Alba 1990;Bach 1993;Simonds 2003). In contrast to spontaneously breathing patients, tracheostomized patients receiving assistcontrol MV cannot prolong their expiratory phase.…”