Some risks associated with having a stent include bleeding from the stent insertion site, having an allergic reaction to the dye used during the operation, contracting an infection and developing blood clots, according to the National Heart, Lung, and Blood Institute. Other risks include developing arrhythmia, having an irregular heartbeat or experiencing excessive tissue growth within the portion of the treated artery.
Other possible problems associated with stent procedures include coronary artery damage, heart attack, stroke or abnormal heart rhythms, explains Mayo Clinic. Heart attacks and strokes are rare. Sometimes, doctors use medications or temporary pacemakers if heart rhythm problems develop during the procedure. Emergency bypass surgery might be necessary if coronary artery damage occurs during the operation.
Other risks associated with stent placement include renarrowing of the artery, experiencing breathing problems after a bronchial stent, having kidney stones after a urethral stent, experiencing seizures or having a blood vessel become infected, according to Healthline. Although rare, the risks associated with aortic stents include blocked blood flow to the abdomen or lower body and leg paralysis due to blocked blood flow to the spinal cord, notes the NHLBI. Doctors typically keep stent patients overnight to closely monitor them for possible complications.