Pokrovskiĭ V M, Cherednik I L, Osadchiĭ O E, Sheĭkh-Zade Iu R, Kurzanov A N
Fiziol Zh Im I M Sechenova. 1993 Jul;79(7):49-54.
The effect of met- and leu-enkephalins in cats was characterised by depressing vagotropic action due to a selective decrease in the tonic component. The potentiation of synchronizing actions may serve as an index of a reliable and stable mechanism of the beat-by-beat control of the cardiac rhythm.