Fig. 4
From: Diaphragm thickening in cardiac surgery: a perioperative prospective ultrasound study
Individual values of diaphragm thickening fraction according to cardiopulmonary bypass duration. The diaphragm thickening fraction (TF) during the spontaneous breathing trial (SBT) was recorded according to the Y, and the cross-clamp time was recorded according to the X. Diaphragm function was reduced when cardiopulmonary bypass time was longer (r = − 0.4; P < 0.0001). SBT: spontaneous breathing trial; TF: thickening fraction