Drug eluting stent in urology.

The Drug eluting stents (DESs) are the most commonly used stents in interventional cardiology. DESs have been shown to minimize the restenosis rate after stenting the coronary vessels by addressing the phenomena of smooth muscle proliferation and inflammation. The effect of the DESs is attributed to the antiproliferative drugs which are coated onto the stent and are released in controlled fashion. The anti-proliferative drugs reduce the hyperplastic reaction by inhibiting the smooth muscle cell cycle and their proliferation. Urological stents are important instruments of the everyday urological practice with a variety of indications for their use. Nevertheless, their use is hampered by a number of complications such as infection, patient discomfort, encrustation, migration and hyperplastic reaction. In an attempt to reduce the complications, the concept of DESs was introduced to Urology. DESs for ureteral or urethral as well as polymeric or metal have been evaluated in experimental studies. The clinical evaluation of DESs is limited only to polymeric stent with results that require further investigation and confirmation. The development of stent designed for the urinary tract, the selection of the appropriate substances combined with the appropriate experimental and clinical investigation would provide DESs acceptable for the urological practice.