To evaluate whether receiving enema before anal surgery or not affects the postoperative recovery and complications.

For patients undergoing anal surgery, some of them receive enema as doctors' preference before the surgery in consider to lower postoperative complications e.g. infection, while others do not. These choices are often determined by surgeons' personal preference according to their experiences due to lack of evidence from researches. Hemorrhoidectomy and fistulotomy are the most common two types of surgery in colon and rectal surgery division in Shuang Ho hospital, where top three quantities of hemorrhoidectomy in Taiwn have been performed.Therefore, we conducted a randomized controlled trial to evaluate the benefits of enema before anal surgery and possible waste of medical resources.

Inclusion Criteria:

• Patients who underwent hemorrhoidectomy, including circular stapled hemorrhoidopexy (PPH) and conventional hemorrhoidectomy
• Patients who underwent fistulotomy or fistulectomy

Exclusion Criteria:

• Emergency surgery
• Surgery other than circular stapled hemorrhoidopexy (PPH) and conventional hemorrhoidectomy, e.g., rubber band ligation, injection treatment, and cryosurgery
• Complicated fistulectomy, e.g., requiring surgical drainage and seton placement
• Other types of anal surgery, e.g., anal fissure and colorectal cancer
• Liver cirrhosis
• Coagulation dysfunction
• Bedridden
• Human immunodeficiency virus infection

The datasets used in this study can be obtained from the investigator upon reasonable request.

data is available as the study is complete and for 12 month period

will be shared upon request