Table 4.

Cerebral Oxygen Extraction (CEO₂, %) at Each Time Point According to Diagnosis Group

Variable	TGA (N=43)	TOF (N=36)	VSD (N=25)	P
Postinduction	31 ± 10	26 ± 13	37 ± 9	<0.001
Heparin administration	26 ± 10	24 ± 12	34 ± 9	<0.001
10 min after cooling	10 ± 7	15 ± 9	19 ± 9	<0.001
Onset of LF	10 ± 7	17 ± 10	18 ± 10	<0.001
10 min into last rewarming	8 ± 6	26 ± 14	31 ± 11	<0.001
Warm flow (35°C)	14 ± 7	29 ± 11	31 ± 11	<0.001
Off CPB	18 ± 9	29 ± 11	33 ± 10	<0.001
60 min post-CPB	23 ± 13	27 ± 13	29 ± 13	0.12
6 h post-CPB	32 ± 14	33 ± 12	36 ± 7	0.53
18 h post-CPB	20 ± 10	29 ± 11	28 ± 7	<0.001

Values are expressed as mean ± standard deviation. P values are determined by analysis of variance.

CEO₂ = SaO₂ − rSO₂; SaO₂ = arterial oxygen saturation; rSO₂ = regional cerebral oxygen saturation; TGA = D-transposition of the great arteries; TOF = tetralogy of Fallot ; VSD = ventricular septal defect; LF = low flow bypass; CPB = cardiopulmonary bypass