The effect of selective cerebral perfusion on cerebral versus somatic tissue oxygenation during aortic coarctation repair in neonates and infants

Table 2 Physiological variables measured at different time points

Variable (unit)	Baseline^a	Skin incision	CPB start	SCP start	SCP stop	Aorta open	CPB stop	Surgery end
SctO₂ (%)	70.3 ± 3.5	67.6 ± 3.5	58.6 ± 3.5	79.6 ± 4.0	71.8 ± 2.5	51.8 ± 2.3	59.0 ± 2.8	61.3 ± 6.0
SstO₂ (%)	58.8 ± 5.8	55.1 ± 6.2	46.4 ± 6.7	39.6 ± 5.2	50.5 ± 4.9	75.8 ± 4.4	70.5 ± 2.3	69.5 ± 6.2
SaO₂ (%)	99.6 ± 0.4	99.6 ± 0.4	99.6 ± 0.4	99.8 ± 0.2	99.9 ± 0.1	99.6 ± 0.4	99.5 ± 0.4	99.4 ± 0.6
SmvO₂ (%)	70.7 ± 5.7	68.4 ± 5.2	56.4 ± 5.0	78.3 ± 4.0	74.4 ± 3.4	58.5 ± 7.8	60.3 ± 5.7	62.3 ± 9.1
MAP-arm (mmHg)	65.9 ± 3.8	63.4 ± 3.0	56.4 ± 3.4	57.6 ± 4.5	54.1 ± 2.5	57.3 ± 4.1	60.2 ± 3.9	59.9 ± 5.1
MAP-leg (mmHg)	44.2 ± 8.5	42.4 ± 7.7	38.7 ± 6.7	22.1 ± 4.8	28.1 ± 9.5	45.2 ± 9.5	48.5 ± 9.6	50.7 ± 10.7
PaCO₂ (mmHg)	45.3 ± 3.8	42.4 ± 3.4	38.9 ± 2.6	31.2 ± 1.8	29.7 ± 1.2	31.6 ± 1.5	35.1 ± 3.5	37.9 ± 3.1
Hematocrit (%)	38.3 ± 2.1	38.0 ± 2.2	37.2 ± 2.1	21.0 ± 1.8	20.6 ± 2.7	25.1 ± 1.8	28.7 ± 1.6	34.3 ± 1.5
Temperature (°C)	37.0 ± 0.5	36.6 ± 0.4	36.2 ± 0.4	20.1 ± 1.2	19.6 ± 1.2	28.6 ± 2.6	36.5 ± 0.5	36.1 ± 0.5
Lactate (mmol/l)	1.3 ± 0.2	1.3 ± 0.3	1.6 ± 0.3	2.5 ± 0.3	3.7 ± 0.4	3.1 ± 0.3	2.6 ± 0.3	2.5 ± 0.4

^awith patient sedated using small dose of fentanyl and midazolam and spontaneously breathing room air
CPB = cardiopulmonary bypass; SCP = selective cerebral perfusion; SctO₂ = cerebral tissue oxygen saturation; SstO₂ = somatic tissue oxygen saturation; SaO₂ = arterial blood oxygen saturation; SmvO₂ = mixed venous blood oxygen saturation; MAP-arm = mean arterial pressure measured on arm; MAP-leg = mean arterial pressure measured on leg; PaCO₂ = arterial blood carbon dioxide partial pressure

ISSN: 1471-2253