Previous work has shown that activation of catccholamine in the preopticarea is to the disadvantage of acupuncture analgesia. In this work microinje- otion and pushpull perfusion as well as HPLC-ECD were used to observe theeffect of noradrenaline and dopamine in this area on acupuncture analgesia

The results indicated that microinjection of noradrcnaline (0. 5μg/unilateral)into the preoptic area could attenuate acupuncture analgesia

while dopamine