Skip to main content

Table 2 Off pump versus on pump cardiac surgery

From: Mechanisms of pulmonary dysfunction after on-pump and off-pump cardiac surgery: a prospective cohort study

  Off-pump n = 8 On-pump n = 31 P
Haemodynamic/metabolic    
Temperature, °C 36.5 (35.6–37.2) 35.7 (34.5–36.5) 0.008
HR,·min-1 74 (57–87) 72 (55–101)  
MAP, mm Hg 70 (57–104) 75 (52–104)  
CVP, mm Hg 3 (1–7) 5 (0–12)  
PCWP, mm Hg 6 (5–7) 7 (1–13)  
MPAP, mm Hg 13 (11–28) 15 (8–23)  
CI, L·min-1·m-2 3.9 (2.7–4.8) 2.8 (2.1–4.3) 0.008
GEDVI, mL·m-2 970 (620–1131) 783 (537–1180)  
ITBVI, mL·m-2 1180 (767–1342) 1019 (641–1498)  
DO2, L·min-1·m-2 503 (385–576) 391 (229–546) 0.008
VO2, L·min-1·m-2 117 (78–192) 120 (26–189)  
Lactate, mmol/L 0.9 (0.6–1.2) 1.4 (0.7–4.1) <0.0001
COP, mm Hg 19 (16–25) 19 (15–24)  
Haemoglobin, mmol/L 5.5 (4.9–7.1) 5.9 (4.3–7.4)  
Haematocrit 0.25 (0.23–0.32) 0.28 (0.20–0.33)  
Pulmonary    
PLI, × 10-3·min-1 18 (13–27) 14 (6–73)  
Supranormal PLI 5 (63) 13 (42)  
EVLW, mL·kg-1 6.7 (4.8–9.7) 5.9 (2.1–20.0)  
Supranormal EVLW 3 (37) 9 (29)  
Vt, mL 580 (400–660) 550 (395–1110)  
Pplat, cm H2O 17(14–19) 17 (13–33)  
PEEP, cm H2O 6 (5–10) 7 (4–16)  
Compliancetot,respir,dyn, cm H2O·mL-1 64 (40–83) 50 (37–91)  
PaO2, mm Hg 128 (98–176) 119 (84–189)  
PaO2/FIO2 299 (251–463) 280 (140–485)  
SaO2 0.98 (0.98–0.99) 0.98 (0.96–0.99)  
SvO2 0.77 (0.69–0.81) 0.73 (0.61–0.95) 0.030
Venous admixture, % 17 (9–21) 16 (5–62)  
Quadrants on X-ray with densities 0 (0–1) 0 (0–3)  
Atelectasis 5 (63) 16 (52)  
Lung injury score 0.7 (0.2–1.2) 1.0 (0.2–2.7)  
Duration MV, h 11 (6–23) 11 (5–494)  
  1. Median (range) or number of patients where appropriate. Abbreviations: HR, heart rate; MAP, mean arterial pressure; CVP, central venous pressure; PCWP, pulmonary capillary wedge pressure; MPAP, mean pulmonary artery pressure; CI, cardiac index; DO2, oxygen delivery; VO2, oxygen consumption; COP, colloid osmotic pressure; PLI, pulmonary leak index; EVLW, extravascular lung water; Vt, tidal volume; Pplat, plateau pressure; PEEP, positive end-expiratory pressure; FIO2, inspiratory O2 fraction; P/SO2, O2 partial pressure/saturation; a, arterial; v, mixed venous; MV, mechanical ventilation.