Total Neurological Deficit Scores (NDS) for rats subjected to 8 minutes (A) or 6 minutes (B) of asphyxial cardiac arrest (CA), and for rats subjected to 6 or 8 minutes CA and subsequently treated with D-cycloserine (DCS) (C), or Vehicle (Saline) (D). There were no significant differences between NDS scores for DCS and saline treated rats; however, neurological deficits persisted longer after 8 minutes CA than after 6 minutes CA. *P<0.05, Tukey, 8 versus 6 minutes, n=18 (6 minutes); n=13 (8 minutes). Data are shown as medians bracketed by first and third quartiles.