Background and Study Aim: Endoscopic retrograde cholangiopancreatography (ERCP) is an important gastrointestinal
endoscopic procedure in the study and treatment of pancreaticobiliary diseases. The
critical step of the procedure is cannulation of the common bile duct (CBD) and/or
the pancreatic duct. Cannulation can be a technical challenge at times. Fat is a natural
stimulator for bile secretion and relaxation of the sphincter of Oddi. The objective
of this study was to determine the effect of a liquid fatty meal on deep CBD cannulation
during ERCP.
Patients and Methods: We performed a randomized double-blind study in 84 patients to examine the effect
of a liquid fatty meal on deep CBD cannulation during ERCP, in a teaching medical
center. In the study group, each patient had a liquid fatty meal orally about 1 hour
before the procedure. In the control group, each patient had the same volume of a
non-fat meal. The appearance of the major papilla, the cannulation rate, the cannulation
time, and the fluoroscopy time during cannulation were compared for the two groups.
Results: The orifice of the CBD/pancreatic duct was much more easily identified in the group
who ingested the fatty meal. Compared with the non-fat meal group, in the fatty meal
group the mean and the median deep CBD cannulation times were shorter, at 8.0 minutes
vs. 14.7 minutes (P = 0.005) and 8.0 minutes vs. 11.5 minutes (P = 0.008), respectively. Additionally, in the fatty meal group, the mean and the median
fluoroscopy times during deep CBD cannulation were lower, at 3.3 minutes vs. 6.1 minutes
(P = 0.040) and 2.5 minutes vs. 3.9 minutes (P = 0.013), respectively. There were no complications, such as aspiration, associated
with the liquid meals given shortly before the ERCP procedure.
Conclusions: To avoid prolonged cannulation and unnecessary radiation exposure, patients should
have a liquid fatty meal before ERCP procedures.
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Q. Cai, M.D., PhD
Division of Digestive Diseases
1365 Clifton Road · Suite B1262 · Emory University School of Medicine · Atlanta, GA
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eMail: qcai@emory.edu