本研究目的在探討電針穴位對膝關節鏡手術術後先機止痛之療 效評估，結果發現對照組、偽假電針組、術前電針組及術後電針組在 手術後第一次要求止痛藥的時間間隔彼此間皆有 s計學上的意義(對 照組 9.90±0.59 <偽假電針組 22.10±2.26 <術前電針組 47.25±2.47 <術 後電針組 57.30±1.75 )，表示電針穴位的確可延長術後疼痛的發生時 間，尤其是當在手術後馬上施以電針治療效果最好。
其次，術前電針組、術後電針組及偽假電針組在 PCA 嗎啡的總 需求量均明顯低於對照組，而前兩者又比偽電針組在術後嗎啡之需求 量為低，且均有 s計學上的顯著意義。由此可知電針穴位確有降低術 後疼痛的作用，而且電針亦存在著安慰劑的效果。
再者，術後電針組比術前電針組在手術後第一次要求 PCA 的時 間間隔有延長的情形，且在 計學上明顯的差異。而術前電針組及術s 後電針組在術後二十四小時內 PCA 的嗎啡總需求量的使用上，前者 嗎啡的使用量多於後者，但在 s計學上並無明顯的差異。此結果顯示 電針在術後馬上給予疼痛治療與術前電針治療之鎮痛效果相近，且此 兩組皆比對照組有更好的術後鎮痛作用，可見電針的止痛作用具有預 防由手術時所產生的中樞神經致敏化及術後發炎性傷害所造成的疼 痛，亦即具有先機止痛的作用。根據本研究結果，關於術後止痛給予 電針穴位的時機上，術前或術後電針之效果並無明顯的差異。
在鴉片類相關副作用的研究中，結果顯示術前及術後電針組在噁 心、眩暈的發生率上明顯低於對照組，因此可推論此可能是因前者的 鎮痛作用而使嗎啡的使用量減少，或是透過針刺穴位的療效，而使鴉 片類相關副作用的發生率降低。
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