癌症患者 ,特别是晚期癌症患者中 ,相当一部分人伴有不同程度的疼痛 ,控制疼痛是提高癌症患者生活质量、临终关怀和姑息处理的重要内容。PCA(patinent- controlled analgesia)即患者自控式止痛 ,当疼痛时患者可自行按压PCA泵按钮 ,止痛药则由 PCA泵自动注入静脉 ,使血药浓度维 A significant proportion of cancer patients, especially those with advanced cancer, have varying degrees of pain and controlling pain is an important part of improving the quality of life, hospice and palliative care of cancer patients. Patient-controlled analgesia (PCA) is a patient-controlled analgesia. When pain is experienced, the patient presses the PCA pump button and the analgesic is automatically infused into the vein by the PCA pump,