Heart stents guided by a flow measurement led to fewer heart problems at 3 years

If you or someone you love ever needs a stent, you now have a smart question to ask: how do you decide which arteries to treat? A three-year look at a large trial found that people whose heart stents were chosen with a blood flow measurement had fewer major heart problems than people whose stents were chosen by looking at the images alone.

The biggest difference showed up in people with several narrowed arteries. That is good news for anyone facing this procedure, because it means a better way to choose is already being tested and working.

How the study worked

Researchers followed 3,825 adults at 26 centers in China who were having a procedure to open narrowed heart arteries, assigning each person by chance to flow-guided or image-guided care and tracking them for 3 years; the results were published Oct. 1, 2026, in JAMA Network Open. This was a follow-up analysis of a randomized trial that split people by how many arteries were narrowed, and it was done in China, so further studies will keep adding to the picture.

What they found

The researchers counted major heart problems: death, a heart attack, or needing another procedure to reopen an artery.

Among people with several narrowed arteries, 124 of 1,023 who had flow-guided stents had a major heart problem within 3 years. In the image-only group it was 188 of 1,043. In percentages, that is 12.1% versus 18.1%. The gap came mostly from fewer heart attacks and fewer repeat procedures.

People with just one narrowed artery saw the same pattern, with fewer problems in the flow-guided group. The size of the benefit did not differ meaningfully between the two groups of patients, so the approach looked helpful across the board. Several other ways of checking the numbers pointed the same direction.

What is QFR, and why does it help?

When a heart artery is narrowed, doctors can open it with a small balloon and a stent. The tricky part is knowing which narrowings are actually holding back blood flow. Some look serious on the images but let plenty of blood through.

QFR stands for quantitative flow ratio. It is software that uses the same images taken during the procedure to estimate how much blood gets past a narrowing. It does not need an extra wire inside the artery. With that information, doctors can place stents where they matter most.

The trial also shows the benefit did not fade. Earlier results at 1 year held up at 3 years.

What you can do today

If you have a heart appointment coming up, or a family member does, write down one question: how do you decide which narrowed arteries need a stent, and do you measure blood flow first? It is a normal, respectful question, and a good cardiologist will be glad to answer it. Keep taking the medicines you were prescribed after any procedure, too.