during umbilical constriction , arterial oxygen tension declined from 21.4 +/- 0.3 to 13.4 +/- 0.3 torr ( p less than 0.001 , mean +/- se ) and was accompanied by an increase in blood pressure ( 44 +/- 1 to 53 +/- 1 torr ) , decrease in heart rate ( 176 +/- 4 to 114 +/- 4 beats/min ) and rise in plasma norepinephrine ( 437 +/- 90 to 3,410 +/- 617 pg/ml ) and epinephrine ( 53 +/- 10 to 1,074 +/- 325 pg/ml ) .
C0028351
norepinephrine
C0014563
epinephrine