结论：B组病人选用PCVA术，持续注入枸橼酸芬太尼，有95％的病人达到了优良的镇痛效果，并且副作用发生率很低，是一种比较理想的术后镇痛疗法。
Conclusion: In group B(PCVA) injected by fentanyl continually, about 95%patients have comfortable result of easing pain and have low side effect. It's a good method of easing pain after operating.
结论：B组病人选用PCVA术，持续注入枸橼酸芬太尼，有95％的病人达到了优良的镇痛效果，并且副作用发生率很低，是一种比较理想的术后镇痛疗法。
Conclusion: In group B(PCVA) injected by fentanyl continually, about 95%patients have comfortable result of easing pain and have low side effect. It's a good method of easing pain after operating.
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