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Table 3

Intraoperative variables for aortic cross-clamp time greater than 90 min.

Variable HKB DNC p-value
N 194 194
Procedure type
 CABG 30 (15%) 24 (12%) 0.72
 Aortic/Dissection 17 (9%) 21 (11%)
 Other 10 (5%) 14 (7%)
 Valve 90 (46%) 93 (48%)
 Valve/CABG 47 (24%) 42 (22%)
CPB time (min) 145 (125, 169) 143 (128, 171) 0.98
AXC time (min) 114 (102, 132) 112 (102, 129) 0.45
Total procedure time (min) 269 (229, 307) 266 (232, 320) 0.76
Hemofiltration requirement 7 (4%) 6 (3%) 1.00
Urine output (mL) 400 (220, 700) 400 (200, 750) 0.99
Minimum haemoglobin (g/L) 95 (81, 106) 90 (76, 103) 0.027
Minimum cardioplegia temperature (°C) 31 (30, 31) 5 (5, 6) <0.001
Total cardioplegia volume delivered (mL) 1885 (1550, 2249) 1009 (1004, 1381) <0.001
Cardioplegia delivery route
 Antegrade 70 (36%) 146 (75%) <0.001
 Retrograde 0 (0%) 2 (1%)
 Antegrade + Retrograde 124 (64%) 44 (23%)
Number of cardioplegia doses 6 (5, 7) 1 (1, 2) <0.001
Spontaneous recovery of rhythm 115 (59%) 170 (89%) <0.001
Maximum ischemic time (min) 32 (28, 36) 98 (90, 109) <0.001
Peak creatinine on pump (umol/L) 99 (82, 126) 101 (82, 134) 0.47
Last haemoglobin on pump (g/L) 96 (83, 108) 96 (86, 107) 0.80

Continuous variables are expressed median (IQR), categorical variables are expressed number (%). Abbreviation: Abbreviation: HKB – hyperkalaemic blood cardioplegia; DNC – Del Nido cardioplegia; CABG coronary artery bypass graft; CPB – cardiopulmonary bypass; AXC – aortic cross-clamp.

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