to assess the effect of epidural block on plasma catecholamines and cortisol during labour and delivery , plasma epinephrine , norepinephrine and cortisol levels were determined in 26 healthy parturients , all of whom delivered vaginally ( 18 received an epidural block , eight had meperidine 50 mg intramuscularly ) .
C0014563
epinephrine
C0028351
norepinephrine