Stents are usually safe and complications are rare. However, they do have some possible risks. Vascular stents that use traditional metal materials can lead to blood clots, allergic reactions, or inflammation scarring. Drug-eluting stents have fewer risks and may be more effective than bare-metal stents. Blood may temporarily appear in the urine in response to ureteral or prostatic stents. Vascular and coronary stents can cause arrhythmia and discomfort, in rare cases. Though rare, a heart attack or stroke is possible.

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