Table 1.

The ABG values of 25 twin pairs (one Hx and one HI fetus/pair) and 7 normal control fetuses (TC) used to study the hippocampal electrophysiology are compared with the ABG values of the 8 HI fetuses used to study hippocampal anatomy in this paper (HI-HC)

		Treatment				p (Bonferroni's multiple-comparisons test)
ABG parameter	ABG time	TC (n = 7)	Hx (n = 24)	HI (n = 21)	HI-HC (n = 8)	TC versus Hx	Hx versus HI	Hx versus HI-HC	HI versus HI-HC
O2 content (vol %)	Pre-ABG	7.1 ± 1.2	7.0 ± 1.1	7.0 ± 1.0	8.6 ± 1.2	NS	NS	<0.05	<0.05
	Hx-ABG	7.3 ± 1.2	4.8 ± 1.7	4.4 ± 1.4	5.6 ± 1.8	<0.001	NS	NS	NS
	HI-ABG	7.4 ± 1.2	4.0 ± 1.7	5.4 ± 2.0	7.1 ± 1.9	<0.0001	<0.01	<0.0001	<0.05
	Post-ABG	7.2 ± 1.8	7.1 ± 1.0	7.5 ± 0.9	8.8 ± 1.5	NS	NS	<0.05	NS
Lactate (mm)	Pre-ABG	1.4 ± 0.2	1.5 ± 0.3	1.5 ± 0.2	1.3 ± 0.3	NS	NS	NS	NS
	Hx-ABG	1.4 ± 0.2	1.5 ± 0.4	1.6 ± 0.2	1.4 ± 0.2	NS	NS	NS	NS
	HI-ABG	1.3 ± 0.2	2.3 ± 1.2	3.2 ± 0.9	3.3 ± 0.8	<0.05	<0.001	<0.01	NS
	Post-ABG	1.4 ± 0.2	2.3 ± 1.1	3.8 ± 1.1	4.1 ± 0.9	<0.05	<0.0001	<0.0001	NS
Glucose (mm)	Pre-ABG	1.4 ± 0.1	1.3 ± 0.1	1.2 ± 0.1	1.4 ± 0.1	NS	NS	NS	NS
	Hx-ABG	1.4 ± 0.1	1.3 ± 0.1	1.3 ± 0.1	1.5 ± 0.2	NS	NS	NS	NS
	HI-ABG	1.4 ± 0.2	1.3 ± 0.1	1.6 ± 0.1	1.8 ± 0.2	NS	<0.05	<0.001	NS
	Post-ABG	1.5 ± 0.2	1.5 ± 0.1	1.5 ± 0.1	1.8 ± 0.2	NS	NS	NS	NS
Hct (%)	Pre-ABG	29 ± 2.2	27 ± 2.7	27 ± 2.3	28 ± 3.6	NS	NS	NS	NS
	Hx-ABG	29 ± 2.2	27 ± 2.9	27 ± 2.5	28 ± 3.9	NS	NS	NS	NS
	HI-ABG	28 ± 3.0	28 ± 3.1	29 ± 2.9	31 ± 3.9	NS	NS	NS	NS
	Post-ABG	29 ± 2.0	27 ± 2.8	27 ± 3.3	29 ± 4.0	NS	NS	NS	NS
Hb (g/dl)	Pre-ABG	9.4 ± 0.7	8.7 ± 0.9	8.8 ± 0.8	9.2 ± 1.2	NS	NS	NS	NS
	Hx-ABG	9.4 ± 0.7	8.7 ± 1.0	8.8 ± 0.8	9.2 ± 1.3	NS	NS	NS	NS
	HI-ABG	9.1 ± 1.0	8.9 ± 1.0	9.4 ± 0.9	9.9 ± 1.3	NS	NS	<0.05	NS
	Post-ABG	9.3 ± 0.7	8.8 ± 0.9	9.0 ± 0.8	9.4 ± 1.3	NS	NS	NS	NS
sO2 (%)	Pre-ABG	56 ± 8.1	59 ± 7.6	59 ± 7.4	70 ± 4.9	NS	NS	NS	NS
	Hx-ABG	57 ± 8.5	40 ± 13	37 ± 12	46 ± 14	<0.01	NS	NS	NS
	HI-ABG	61 ± 9.1	33 ± 14	42 ± 16	53 ± 14	<0.0001	<0.05	<0.0001	NS
	Post-ABG	57 ± 12	60 ± 7.4	62 ± 8.2	70 ± 8.7	NS	NS	NS	NS
paO2 (mmHg)	Pre-ABG	23 ± 2.3	23 ± 2.6	23 ± 3.0	25 ± 1.7	NS	NS	NS	NS
	Hx-ABG	23 ± 2.5	18 ± 3.2	17 ± 2.6	17 ± 3.6	<0.001	NS	NS	NS
	HI-ABG	24 ± 2.4	16 ± 4.4	19 ± 3.4	20 ± 4.4	<0.0001	NS	<0.05	NS
	Post-ABG	23 ± 3.2	23 ± 3.0	25 ± 3.2	26 ± 3.1	NS	NS	NS	NS
paCO2 (mmHg)	Pre-ABG	47 ± 2.2	48 ± 2.3	48 ± 2.8	45 ± 2.9	NS	NS	<0.05	<0.05
	Hx-ABG	47 ± 2.5	45 ± 2.4	46 ± 2.9	41 ± 2.9	NS	NS	<0.01	<0.01
	HI-ABG	45 ± 6.3	46 ± 3.1	44 ± 3.0	41 ± 5.3	NS	NS	<0.001	NS
	Post-ABG	48 ± 2.6	47 ± 2.0	48 ± 2.8	44 ± 3.3	NS	NS	NS	<0.05
pH	Pre-ABG	7.4 ± 0.04	7.4 ± 0.02	7.4 ± 0.02	7.4 ± 0.02	NS	NS	NS	NS
	Hx-ABG	7.4 ± 0.04	7.4 ± 0.02	7.4 ± 0.01	7.4 ± 0.02	<0.01	NS	NS	NS
	HI-ABG	7.4 ± 0.05	7.4 ± 0.02	7.4 ± 0.03	7.4 ± 0.03	NS	NS	<0.05	<0.05
	Post-ABG	7.4 ± 0.05	7.4 ± 0.02	7.4 ± 0.03	7.3 ± 0.03	NS	<0.01	<0.001	NS