CONCLUSION: One of the important mechanisms for the pain-relieving effect of ultrasound-medium frequency electrotherapy might be the increase of methionine enkephalin in adenohypophysis.

• 结论:腺垂体甲硫氨酸脑啡肽水平升高可能是超声-中频电疗法发挥镇痛作用的重要机制之一。