Does Maturity Affect Cephalic Perfusion and T/QRS Ratio during Prolonged Umbilical Cord Occlusion in Fetal Sheep?

Table 2

Blood composition parameters.

	Group	Baseline	Occlusion time 1	Occlusion time 2	Recovery
pH	0.6 GA	7.39±0.0	7.06±0.0^†	6.76±0.0^†	7.36±0.0^∗
	0.7 GA	7.38±0.0	7.05±0.0^†	6.82±0.0^†	7.31±0.0^†
	0.8 GA	7.36±0.0	7.21±0.0^†	6.94±0.0^†	7.18±0.1^†
PaO2; mmHg	0.6 GA	25.1±0.6	7.1±1.0^†	8.4±0.9^†	26.1±0.9
	0.7 GA	22.3±0.9	6.0±0.7^†	7.0±0.6^†	29.6±2.4^†
	0.8 GA	19.6±1.6	5.4±0.9^†	8.3±0.9^†	23.0±3.2
PaCO2; mmHg	0.6 GA	44.5±0.8	90.5±3.8^†	159.5±3.3^†	42.8±0.8
	0.7 GA	47.7±1.3	96.6±3.6^†	150.8±7.1^†	43.4±1.0
	0.8 GA	45.7±2.4	71.1±4.0^†	114.7±2.6^†	49.9±1.2
Lactate; mmol/L	0.6 GA	1.0±0.3	4.5±0.4^†	7.4±0.5^†	3.0±0.3^†
	0.7 GA	0.7±0.0	3.8±0.2^†	7.3±0.2^†	4.9±0.3^†
	0.8 GA	1.0±0.3	2.5±0.4	5.5±0.2^†	6.4±1.6^†
Glucose; mmol/L	0.6 GA	1.1±0.1	0.4±0.1^†	0.4±0.1^†	1.3±0.1
	0.7 GA	0.9±0.0	0.3±0.0^†	0.6±0.1^†	1.6±0.1^†
	0.8 GA	0.7±0.1	0.3±0.1	1.0±0.1	1.5±0.3^†

Blood samples were taken 60 min before asphyxia (baseline), during the occlusion period (0.6 GA; 5 and 25 min, 0.7 GA; 5 and 20 min, 0.8 GA; 2 and 12 min), and 60 minutes after asphyxia (recovery). PaO₂, fetal arterial pressure of oxygen; PaCO₂, fetal arterial pressure of carbon dioxide. Data are means ± SEM; comparisons to baseline by one-way ANOVA and Dunnett test. ^∗𝑃<0.05 versus baseline; ^†𝑃<0.01 versus baseline.