Effects of two ventilator-weaning methods on lung volume and ventilation distribution by electrical impedance tomography in post-cardiac surgery patients: a prospective cohort study.

ABSTRACT:

Background

The effect of different spontaneous breathing trial (SBT) methods on lung volume and ventilation distribution has not been well clarified in post-cardiac surgery patients.

Methods

In this prospective observational study, patients underwent 30 min of pressure-support ventilation (PSV)-SBT [PS 8 cmH₂O, zero positive end-expiratory pressure (ZEEP)], followed by a 30-min T-piece trial if tolerated. Electrical impedance tomography (EIT) was used to continuously monitor regional lung ventilation and end-expiratory lung volume (EELV) at baseline, PSV-SBT 3 min, PSV-SBT 30 min, T-piece SBT 3 min and T-piece SBT 30 min. EELV_loss = [VT_baseline/tidal impedance variation (TIV)_baseline] × ΔEELI. EELV_{loss PSV} was defined as

SUBMITTER: Zhang S 

PROVIDER: S-EPMC12910891 | biostudies-literature | 2026 Jan

REPOSITORIES: biostudies-literature