[Action of morphine and fentanyl during the electrostimulation of biologically active points]

Experiments on rabbits showed the summation of analgesia induced by electric stimulation of biologically active points (BAP) and by administration of morphine and fentanil within a certain dosage range. The differences recorded in cortical evoked potentials in response to excitation of BAP and of an active point of the rabbit forefoot were levelled off in the presence of morphine administration.