Table 1. Physiological parameters of nonpregnant (Nonpreg) and late-pregnant (Preg) rats under chloral hydrate anesthesia for seizure threshold measurements.

	Nonpreg (n = 7)	Preg (n = 6)
Body Weight (grams)	287 ± 7	377 ± 10 **
Body Temp ( o C)	36.3 ± 0.2	36.8 ± 0.2
Arterial P O2 (mm Hg)	114 ± 8	111 ± 7
Arterial P CO2 (mm Hg)	42.1 ± 1.9	42.8 ± 1.7

** p < 0.01 vs. Nonpreg using Student’s t-test