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Table 2 Physiological measurements, according to diaphragm thickening during spontaneous breathing trial (SBT) with the settings used during the ultrasound assessment (pressure support and positive end-expiratory pressure set at 0 cmH2O)

From: Diaphragm thickening in cardiac surgery: a perioperative prospective ultrasound study

Variables All (n = 100) Low diaphragm thickening during SBT (n = 75) No low diaphragm thickening during SBT (n = 25) P value
Physiological data
 TV (ml) 426 (120) 439 (125) 395 (99) 0.1
 RR (cycles/min) 24 [20–27] 23 [20–28] 22 [20–26] 0.6
 RR/TV 62 (29) 61(28) 63 (27) 0.5
 SpO2 (%) 100 [98–100] 100 [98–100] 100 [98–100] 0.3
 Mean arterial pressure (mmHg) 75 (18) 75 (16) 78 (14) 0.9
 Heart rate (bpm) 78 (14) 80 (12) 75 (18) 0.2
 PaO2/FiO2 303 (75) 302 (66) 341 (89) 0.02
 PaCO2 (mmHg) 37 (6) 38 (6) 36 (5) 0.1
  1. Data are presented as mean and standard deviation, median with first and third quartile or number [–] and percentages ()
  2. TV tidal volume, RR respiratory rate, SBT spontaneous breathing trial, bpm beats per minute, TF thickening fraction