Successful treatment of esophageal fistulas with endoscopic injection of alpha-cyanoacrylate monomer.

The application of glue is an established treatment for fistulas [1,2]. We consider that the alpha-cyanoacrylate monomer (α-CA) is ideal for glue embolization of intractable fistulas in the gastrointestinal tract because the α-CA glue spreads faster, so creating a bond more rapidly than the other polymer glues, such as n-butyl cyanoacrylate polymer and 2-octyl cyanoacrylate polymer [3]. However, there have been few reports of successful fistula closure using α-CA glue [4]. We herein report on four patients with intractable esophageal fistulas who were successfully treated with endoscopic injection of α-CA. The causes of the fistulas were as follows: an aortoesophageal fistula that developed following a road traffic accident (Patient #1); anastomotic leakage after esophagectomy for esophageal cancer (Patients #2 and #3); perforation of a colon conduit after esophagectomy for esophageal cancer (Patient #4). In the image-guided therapy suite, a mixture of α-CA (Aron alpha A; Sankyo, Tokyo, Japan) and oily contrast agent (Lipiodol; Guerbet, Tokyo, Japan) in a ratio of 0.3mL:1.7mL was endoscopically injected through the fistula using a dispersion tube and a 2.5-mL glue syringe. We used 50% glucose to push the solution from the syringe into the dispersion tube. Because the presence of moisture causes the glue to set, exposure to normal levels of humidity in the air will start polymerization occurring within seconds. However, by making the glue syringe containing the α-CA and Lipiodol air-tight, we were able to inject the solution safely during endoscopy in the image-guided therapy suite. The procedure was repeated every 1 or 2 weeks until the fistula was closed. In all four patients, the esophageal fistulas were successfully closed with four or six endoscopic injections of α-CA (●" Fig.1). This method is a feasible and safe procedure that may be effective for the treatment of nonhealing esophageal fistulas. Endoscopy_UCTN_Code_TTT_1AO_2AI