ObjectiveTo observe the influence of three postoperative analgesia methods on the survival rate of replanted finger by flat digital subtraction angiography (DSA) medical imaging detection system. MethodFrom July 2014 to July 2015, 342 patients were classified into gradeⅠ and gradeⅡ replantation in accordance with their physical condition and they were randomly divided into routine oral group, muscle injection group and analgesia group with 144 patients in each. Flat DSA was used to dynamically observe replantation after revascularization. Then we compared the three different analgesia methods in terms of psychological status of the patients, incidence of vascular crisis, occlusion rate, survival rate of replanted fingers. The function score of replanted fingers was evaluated for clinical efficacy. ResultsCompared with the conventional oral group and muscle injection group, the incidence of vascular crisis in replanted fingers and thrombosis rate were significantly lower in the analgesia group which had a replanted finger survival rate of 96.69% and a normal mental condition rate of 78.07%. Six months after surgery, the rate of excellent and good follow-up was significantly higher than the conventional oral group and muscle injection group (P<0.017) . ConclusionsThe 3-D technology of flat DSA can provide clear and reliable pictures of vessel revascularization status for replanted fingers. The use of continuous brachial plexus analgesia performs better than other methods of analgesia. Good analgesia can stabilize patients' anxiety and negative emotions, which is helpful to avoid excessive fluctuations in blood pressure induced by small artery spasm caused by blood clots and vascular crisis, thereby increasing the survival rate of replanted fingers and facilitating early rehabilitation of their function.