Transient hyperemic response ratio (THRR) during unilateral and bilateral carotid artery compression in newborn male and female pigs before (sham), after FPI, and after FPI treated with NE or NE + U 0126 iv, n =5 *p<0.05 compared to corresponding sham value, +p<0.05 compared to corresponding FPI alone value, #p<0.05 compared to corresponding female value.