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Spontaneous breathing trial in T‐tube negatively impact on autonomic modulation of heart rate compared with pressure support in critically ill patients

Spontaneous breathing with a conventional T‐piece (TT) connected to the tracheal tube orotraqueal has been frequently used in clinical setting to weaning of mechanical ventilation (MV), when compared with pressure support ventilation (PSV). However, the acute effects of spontaneous breathing with TT versus PSV on autonomic function assessed through heart rate variability (HRV) have not been fully elucidated.