Blood conservation pediatric cardiac surgery in all ages and complexity levels

Table 4 Intraoperative variables in STAT categories for blood conservation and non-conservation cohorts

Operative variables	NC STAT 1 n = 118 (54%)	BC STAT 1 n = 73 (53%)	P	NC STAT 2 n = 53 (24%)	BC STAT 2 n = 25 (18%)	P	NC STAT 3 n = 29 (13%)	BC STAT 3 n = 15 (11%)	P	NC TAT 4 n = 17 (8%)	BC STAT 4 n = 21 (15%)	P
Average age (d)	2419 ± 2667	3088 ± 3498	0.12	1500 ± 1947	1012 ± 2176	0.001	899 ± 1762	619 ± 1659	0.62	1724 ± 3559	1447 ± 2817	0.81
Weight (kg)	27 ± 26	29 ± 24	0.53	17 ± 18	15 ± 23	0.58	11 ± 13	9 ± 12	0.65	16 ± 25	14 ± 21	0.81
% Male	58%	42%	0.07	47%	56%	0.63	45%	40%	0.76	47%	38%	0.74
Bypass (min)	82 ± 37	74 ± 39	0.2	127 ± 68	94 ± 47	0.03	185 ± 73	131 ± 73	0.02	155 ± 66	132 ± 49	0.22
Cross clamp (min)	42 ± 29	38 ± 31	0.35	59 ± 55	43 ± 43	0.21	87 ± 64	81 ± 45	0.77	81 ± 58	71 ± 37	0.52
Pre-operative Hct (%)	31 ± 4	31 ± 4	0.77	29 ± 5	36 ± 8	0.09	34 ± 11	34 ± 6	0.95	37 ± 8	37 ± 7	0.7
Pre-bypass Hct (%)	31 ± 4	30 ± 4	0.62	35 ± 8	33 ± 7	0.39	35 ± 7	32 ± 6	0.14	35 ± 7	35 ± 6	0.7
On-bypass Hct (%)	24 ± 3	25 ± 4	0.07	25 ± 4	25 ± 4	0.45	25 ± 4	23 ± 3	0.04	25 ± 3	24 ± 4	0.37
Post-bypass Hct (%)	31 ± 4	33 ± 3	0.02	35 ± 5	36 ± 4	0.63	38 ± 5	32 ± 3	0.02	39 ± 12	34 ± 5	0.39
Operative RBC (mL/kg)	36 ± 50	21 ± 30	0.02	66 ± 65	40 ± 39	0.03	115 ± 78	53 ± 31	0.03	219 ± 301	64 ± 47	0.05
RBC exposure (unit)	0.9 ± 0.7	0.5 ± 0.6	< 0.001	1.7 ± 1	0.7 ± 0.4	< 0.001	2.2 ± 2.2	0.8 ± 0.5	< 0.001	2.0 ± 0.9	0.7 ± 0.4	< 0.001

BC: Blood conservation; NC: Non-conservation; RBC: Red blood cell; Hct: Hematocrit; STAT: Society of Thoracic Surgeon and European Association for Cardio-Thoracic Surgery Mortality Score.