Data are presented as mean±SEM. A two-way ANOVA,
followed by a Student-Newman-Keuls test, allowed comparisons
within each group. Values significantly different
from baseline are indicated in the figures. A one-way ANOVA
was performed for blood gas values at each sample time
and for between-group comparisons. Survival rates were
compared by Fisher’s exact test. Statistical significance was
considered to be present at the P