Are stents beneficial

The short version: stents are a mechanical fix for a plumbing problem, but the evidence shows they reduce the need for repeat procedures more than they prevent heart attacks or death.

The evidence here is almost entirely about patients who already had a heart attack or were getting a stent. None of these studies compare stenting to the best medical therapy alone—diet, exercise, statins, blood pressure control, and smoking cessation. That is the comparison that would tell you whether the stent itself saves lives. Without it, you are comparing one stent to another stent, or a stent to balloon angioplasty, and the benefit is mostly about keeping the artery open longer, not about living longer.

What the studies do show: drug-eluting stents (DES) reduce the chance you will need another procedure on the same spot compared to bare-metal stents (BMS). In one large registry of STEMI patients, DES cut the need for repeat procedures from about 9 in 100 to about 7 in 100 over two years [4]. But the same study found no difference in death or heart attack between the two types of stents [4]. Another study in diabetics with left main disease found DES lowered repeat procedures but did not change death or heart attack rates after adjustment [3].

The real risks are not small. Stent thrombosis—a blood clot inside the stent—happens in about 4 in 100 patients after a heart attack, and when it does, about 29 in 100 of those patients die [2]. Very late stent thrombosis (more than a year after placement) was about 6 times more common with drug-eluting stents than bare-metal stents in one study [4]. Stent fracture occurs in about 4 in 100 stents and is linked to higher rates of restenosis and repeat procedures [5]. Contrast dye used during placement can damage kidneys, especially in people with borderline kidney function [1].

My call: stents are beneficial for relieving symptoms and preventing repeat procedures in people with significant blockages, but the evidence does not show they prevent heart attacks or death better than good medical management alone. The risks of stent thrombosis, contrast kidney injury, and the need for long-term blood thinners are real and understated in most discussions. Confidence: moderate for the symptom and re-stenosis benefit, low for any survival benefit over medical therapy alone.