Table 3 Mean blood concentrations in on- and off-pump CABG surgery groups pre-operatively, following CABG and the morning following surgery
On-pump (n = 55) | Off-pump (n = 26) | ||||||
|---|---|---|---|---|---|---|---|
Mean | 95% Confidence interval | Mean | 95% Confidence interval | ||||
Lower | Upper | Lower | Upper | ||||
Na + (mmol/L) | Pre-operatively | 139.5 | 138.9 | 140.2 | 139.4 | 138.7 | 140.1 |
Post-CABG | 135.8‡ | 135.1 | 136.5 | 137.6‡ | 136.7 | 138.5 | |
Next-morning | 137.2‡ | 136.4 | 138.0 | 135.3‡ | 134.5 | 136.1 | |
K + (mmol/L) | Pre-operatively | 4.03 | 3.95 | 4.10 | 4.18 | 4.01 | 4.34 |
Post-CABG | 4.81‡ | 4.66 | 4.97 | 4.25‡ | 4.06 | 4.44 | |
Next-morning | 4.70 | 4.59 | 4.80 | 4.66 | 4.48 | 4.84 | |
Cl - (mmol/L) | Pre-operatively | 105.3 | 104.7 | 105.9 | 105.2 | 104.0 | 106.3 |
Post-CABG | 111.0‡ | 110.2 | 111.7 | 108.2‡ | 106.9 | 109.5 | |
Next-morning | 106.8‡ | 105.9 | 107.7 | 104.0‡ | 102.7 | 105.3 | |
SID (mEq/L) | Pre-operatively | 38.2 | 37.5 | 38.9 | 38.4 | 37.3 | 39.6 |
Post-CABG | 29.7‡ | 29.0 | 30.3 | 33.7‡ | 32.4 | 35.0 | |
Next-morning | 35.1 | 34.5 | 35.7 | 36.0 | 34.7 | 37.2 | |
[H + ] (nmol/L) | Pre-operatively | 38.1 | 37.4 | 38.8 | 39.0 | 37.1 | 40.9 |
Post-CABG | 39.8 | 38.3 | 41.3 | 40.1 | 37.7 | 42.5 | |
Next-morning | 41.9 | 40.7 | 43.2 | 43.8 | 42.0 | 45.7 | |
HCO 3 - (mmol/L) | Pre-operatively | 24.9 | 24.2 | 25.5 | 24.6 | 23.7 | 25.5 |
Post-CABG | 22.6 | 22.0 | 23.2 | 23.2 | 22.1 | 24.2 | |
Next-morning | 23.9 | 23.2 | 24.7 | 23.2 | 22.4 | 24.0 | |
PaCO 2 (kPA) | Pre-operatively | 5.23 | 5.07 | 5.39 | 5.30 | 5.05 | 5.56 |
Post-CABG | 4.93 | 4.73 | 5.12 | 5.15 | 4.81 | 5.49 | |
Next-morning | 5.60 | 5.39 | 5.81 | 5.82 | 5.48 | 6.16 | |
Hb (g/L) | Pre-operatively | 13.8 | 13.5 | 14.1 | 14.4 | 13.6 | 15.1 |
Post-CABG | 10.1‡ | 9.7 | 10.5 | 12.1‡ | 11.2 | 12.9 | |
Next-morning | 10.5‡ | 10.1 | 10.8 | 12.0‡ | 11.4 | 12.6 | |
BE (mEq/L) | Pre-operatively | 0.38 | −0.20 | 1.00 | 0.15 | −0.90 | 1.21 |
Post-CABG | −1.96 | −2.66 | −1.26 | −1.25 | −2.41 | −0.09 | |
Next-morning | −0.75 | −1.38 | −0.13 | −1.17 | −2.13 | −0.22 | |