Performance characteristics of retrograde single-balloon endoscopy: A single center experience.
OBJECTIVE
To evaluate the technical success, diagnostic yield (DY) and therapeutic potential of retrograde single balloon enteroscopy (rSBE).


METHODS
A retrospective review of 136 rSBE procedures performed at a tertiary academic referral center from January 2006 and September 2013 was completed. Patient characteristics including age, gender and inpatient status were collected. The indication for the procedure was categorized into one of three groups: Obscure gastrointestinal bleeding (GIB), evaluation for Crohn's disease and abnormal imaging. Procedural characteristics including insertion depth (ID), procedure time, concordance with pre-procedural imaging and complications were also recorded. Lastly, DY, defined as the percentage of cases producing either a definitive diagnosis or findings that could explain clinical symptoms and therapeutic yield (TY), defined as the percentage of cases in which a definitive intervention was performed, were determined. Mucosal tattooing and biopsy alone were not included in the TY.


RESULTS
A total of 136 rSBE procedures were identified. Mean patient age was 57.5 (± 16.2) years, 67 (49.2%) were male, and 110 (80.9%) procedures were performed on an outpatient basis. Indications for rSBE included GIB in 55 (40.4%), evaluation of inflammatory bowel disease (IBD) in 29 (21.3%), and imaging suggestive of pathology other than GIB or IBD in 43 (31.6%). Nine (6.6%) rSBEs were performed for other indications. Mean ID was 68.3 (± 39.3) cm proximal to the ileocecal valve and mean time to completion was 41.7 (± 15.5) min. Overall, 73 (53.7%) cases were diagnostic and 25 (18.4%) cases were therapeutic in which interventions (argon plasma coagulation, stricture dilatation, polypectomy, etc.) were performed. Pre-procedural imaging was performed in 88 (64.7%) patients. Endoscopic concordance of positive imaging findings was seen in 31 (35.2%) cases. Follow up data was available in 93 (68.4%) patients; 2 (2.2%) reported post-procedural abdominal pain within 30 d following rSBE. There were no other reported complications.


CONCLUSIONS
rSBE exhibits an acceptable diagnostic and TY, rendering it a safe and effective procedure for the evaluation and treatment of small bowel diseases.
Kaci E Christian, Karan Kapoor, Eric M Goldberg, Department of Medicine, Division of Gastroenterology, University of Maryland Medical Center, Batimore, MD 21201, United States.
Kaci E
KE
Christian
Kaci E Christian, Karan Kapoor, Eric M Goldberg, Department of Medicine, Division of Gastroenterology, University of Maryland Medical Center, Batimore, MD 21201, United States.
Karan
K
Kapoor
Kaci E Christian, Karan Kapoor, Eric M Goldberg, Department of Medicine, Division of Gastroenterology, University of Maryland Medical Center, Batimore, MD 21201, United States.
Eric M
EM
Goldberg
Endoscopy; Enteroscopy; Retrograde; Single-balloon