Wire-guided selective cannulation of the bile duct with a sphincterotome: a prospective randomized comparative study with the standard method

Objective. Wire-guided cannulation (WGC) is expected to reduce the incidence of post-ERCP pancreatitis (PEP). Our aim was to compare the incidence of PEP and the success rate of deep biliary cannulation using WGC or the standard cannulation method with contrast injection (STD). Material and methods. A total of 172 cases with an intact papilla were randomized into the STD group (n = 86) and the WGC group (n = 86). First a trainee endoscopist attempted the cannulation and if it was not successful, an expert endoscopist tried. When the cannulation was not successful within 10 min, the other method was conducted as a second attempt. The primary endpoint was the incidence of PEP and the secondary endpoint was the success rate of selective cannulation. Results. In successful cases, PEP occurred in 6.5% in the STD group and 3.0% in the WGC group in the first attempt. Overall rate of PEP was 6.0% (3, mild; 1, moderate and 1, severe) in the STD group and 2.3% (2, mild) in the WGC group, which were not significantly different. Selective cannulation rate in the first attempt was 73.8% in the STD group and 77.9% in the WGC group. After a crossover, the cannulation was successful in the second attempt in 36.4% and 42.1% and finally in 95.2% and 100% by the STD and WGC method, respectively. Conclusions. The incidence of PEP tended to be lower in the WGC method compared to the STD method. In addition, all cases of pancreatitis in the WGC group were mild. The success rate of cannulation was comparable between two groups.