A prospective randomised multicentre trial comparing 10 Fr Teflon Tannenbaum stents with 10 Fr polyethylene Cotton-Leung stents in patients with malignant common duct strictures

Background-Stent blockage is a multifactorial process in which stent design and materials, bacteria, proteins, and bile viscosity play a role. Aims-To compare the patency of the 10 Fr Teflon Tannenbaum (TT) stent to th at of the 10 Fr Cotton-Leung (CL) polyethylene stent with sideholes, in pat ients with malignant obstructive jaundice. Methods-Patients were recruited to this prospective multicentre randomised study if they had a newly diagnosed malignant bile duct stricture below the hilum of the liver suitable for stenting with a 10 Fr stent. Data were col lected and monitored by a professional monitoring company. Primary patency was the interval between stent placement and first exchange or death withou t recurrent jaundice. Results-134 consecutive patients were recruited between November 1994 and J une 1997; 65 were randomised to the TT stent and 69 to the CL stent. Median patency and 95% confidence intervals were 181 (59, 303) days for the TT st ent and 133 (92, 174) days for the CL stent, with no significant difference between the two stents (p=0.49). Median survival and 95% confidence interv als were 115 (71, 159) days for the TT stent and 151 (112, 190) days for th e CL stent, with no significant difference between the two stents (p=0.765) . Conclusion-Neither Teflon as a stent material nor the Tannenbaum design pro long the patency of plastic stents.