Long-term success of antegrade endopyelotomy compared with pyeloplasty at a single institution.

Background And Purpose: The classic standard for surgical repair of ureteropelvic junction (UPJ) obstruction has been open pyeloplasty, with a 95% success rate. Antegrade endopyelotomy is a less-invasive option with a slightly lower success rate. However, recent data call into question the long-term durability of UPJ repair. We present the long-term success of treatment of UPJ obstruction comparing these two modalities.

Patients And Methods: We reviewed the medical records of patients undergoing percutaneous antegrade endopyelotomy or open and laparoscopic pyeloplasty for UPJ repair in our practice from 1988 to 2004. Success was defined as both radiographic and symptomatic improvement. We evaluated the impact of preoperative factors, including prior surgical repair, crossing vessels, renal function, and calculi, on success.

Results: The estimated 3-, 5-, and 10-year recurrence-free survival rates for the endopyelotomy group (N = 182) were 63%, 55%, and 41%, respectively, compared with 85%, 80%, and 75% for the pyeloplasty group (N = 175; P < 0.001). Of the failed endopyelotomies undergoing salvage open repair, 8 of 26 (31%) had crossing vessels. Poor renal function and previous failed pyeloplasty decreased success in the pyeloplasty group. Variation from standard cold-knife incision adversely affected endopyelotomy success.

Conclusions: Long-term success rates after both endopyelotomy and pyeloplasty are worse than previously reported. Although most failures in both groups occurred within 2 years, failures continue to appear after 5 and 10 years, and patients should be followed accordingly. In view of these results of endopyelotomy, laparoscopic pyeloplasty may prove to be the preferred minimally invasive approach to repair UPJ obstruction.