This clinical retrospective study collected 408 cases of anal fistula combined with T2DM attending the Hospital of Chengdu University of Chinese Medicine from June 2017 to May 2022. The study excluded anal fistula caused by Crohn's disease or exotic injuries (from indigestible diets or external devices). Extremely complicated fistulas that were not suitable for fistulotomy, cutting seton surgery or a combination procedure were screened out. And fistulas in the active phase of anal fistula were excluded. Research recruited 408 patients, but 43 patients were eliminated because of recurrence (within 6 months) (n = 35), severe clinical data deficits, failure to perform surgery, or missed visits. In the end, a total of 365 patients were included. Up on wound recovery time, patients were divided into the non-healing (refractory) group (n = 170) and the healing group (n = 195), respectively. After matching, there were 122 patients in each group. The detailed operation procedure was shown in Figure 1. This study was approved by the ethics committee of the Hospital of Chengdu University of Traditional Chinese Medicine (ethics number: 2022KL-018). The research was a retrospective clinical study and only the patients’ previous treatment data were extracted through the medical system. Therefore, no informed consent was required from the patients.
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