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Intracoronary nicorandil improves TIMI flow and reduces AMR in STEMI patients undergoing primary PCINew Drug Opens Tiny Vessels After Heart Attack Treatment

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Key Takeaway
Consider intracoronary nicorandil for STEMI patients; improves TIMI flow and reduces AMR in this small trial.

This single-center randomized trial evaluated intracoronary nicorandil in 63 patients with first-episode ST-segment elevation myocardial infarction undergoing primary PCI. The intervention group received 2 mg of nicorandil after guidewire crossing, while the control group received standard PCI. The primary outcome was final post-PCI AMR, with secondary outcomes including QFR-derived indices, reperfusion measures, hemodynamics, biomarkers, and clinical events.

In the nicorandil group, the rate of post-PCI TIMI grade 3 flow was 96.9%, compared with 74.2% in the control group (P = 0.013). Final AMR was significantly lower in the nicorandil group (1.4 ± 0.5) versus the control group (2.7 ± 0.5) (P < 0.05). Multiplicity was controlled using the Benjamini–Hochberg false discovery rate where applicable.

Safety and tolerability data, including adverse events, serious adverse events, discontinuations, and tolerability, were not reported. The study did not report follow-up duration. Effects on wire-free, angiography-derived measures of microvascular function are not well defined. Funding or conflicts of interest were not reported.

Clinical relevance remains uncertain given the small sample size, lack of safety data, and incomplete reporting of follow-up and broader outcomes. These findings suggest a potential benefit for microvascular reperfusion but require confirmation in larger trials with comprehensive safety profiles.

  • Nicorandil improves blood flow in tiny heart vessels.
  • Helps patients with first heart attacks during stent surgery.
  • Still in trials, not available in hospitals yet.

A new drug given during heart surgery may help blood flow reach the heart muscle better.

Imagine waking up after a heart attack. The main artery is open. But the small ones are stuck.

This feeling is common. It happens even when doctors fix the big blockage.

Many patients worry about this. They think the surgery is done. But the work is not finished.

Why tiny blood vessels matter

Heart attacks block the big pipes that feed the heart. But tiny pipes matter too because they feed the cells. Many people still feel bad even after surgery because the small vessels are blocked.

This happens because small vessels get damaged during the event. They cannot carry blood to the heart muscle.

Doctors call this microvascular dysfunction. It leads to more pain and risk later.

Even if the main line is clear, the neighborhood is cut off. The heart tissue needs oxygen to survive.

Without it, the damage spreads. This is why we look deeper.

The surprising shift in care

Doctors used to focus on the main artery. Now they see the small ones. But here’s the twist...

We thought opening the big pipe was enough. We were wrong about the small ones.

This study looks at those hidden problems. It tests a drug to fix them.

For years, we ignored the microcirculation. Now we know it drives outcomes.

This changes how we measure success. It is not just about the stent.

Think of pipes clogged with rust. Nicorandil acts like a cleaner. It relaxes the walls.

It has two jobs. It widens the vessels like a nitrate. It also opens special channels.

This helps blood move freely again. It fixes the flow at the smallest level.

Imagine a traffic jam on a small street. This drug clears the cars.

It works fast during the procedure. The goal is immediate improvement.

63 patients joined this test. One group got the drug, one didn't. They watched blood flow for a while.

The drug group had better flow. 97% had perfect flow compared to 74%.

Resistance dropped significantly in the treated group. Lower resistance means easier travel for blood.

The measurements were taken with special tools inside the heart. They showed real changes in pressure that matter for health.

This is not just a guess or a hope. The data supports the theory strongly.

This doesn’t mean this treatment is available yet.

Experts say this is a promising step. It targets the hidden problem.

It proves we can fix the small vessels. This changes how we view recovery.

We are moving from fixing the blockage to fixing the flow.

Is this ready for you

Talk to your doctor. Don't ask for this drug now.

It is not approved for general use. You cannot get it at a pharmacy.

Doctors must weigh risks and benefits carefully.

If you have a heart attack, ask about standard care. Do not expect this new option.

Limitations to know

Small group. One hospital. Need more proof.

This was a single-center trial. Results might change with more people.

We need to see long-term safety. We do not know all side effects yet.

The study was short. We need to see if benefits last.

The Future of This Treatment

Bigger tests coming. Approval takes time.

Researchers will run larger trials soon across multiple hospitals. They need to confirm these results in different groups.

If successful, this could change standard care for everyone. But patience is key for patients waiting for help.

Regulatory bodies will review the data carefully. They want to be sure it is safe for all.

This is a step forward for science. But the journey is not over yet.

Study Details

Study typeCohort
EvidenceLevel 3
PublishedApr 2026
View Original Abstract ↓
BackgroundMicrovascular dysfunction remains a major driver of adverse outcomes after ST-segment elevation myocardial infarction (STEMI) despite successful restoration of epicardial patency by primary percutaneous coronary intervention (PCI). Nicorandil has nitrate-like vasodilatory properties and ATP-dependent potassium channel (KATP)-opening properties, effects that may improve reperfusion physiology. However, its effects on wire-free, angiography-derived measures of microvascular function are not well defined. We evaluated whether intracoronary nicorandil administered during primary PCI improves angiography-derived microvascular function assessed by angiographic microcirculatory resistance (AMR) and quantitative flow ratio (QFR).MethodsIn this prospective, single-center randomized trial, 63 patients with first-episode STEMI undergoing primary PCI were allocated 1:1 to intracoronary nicorandil (2 mg after guidewire crossing; n = 32) or control (standard PCI; n = 31). The prespecified primary endpoint was final post-PCI AMR. QFR-derived indices, reperfusion measures [Thrombolysis in Myocardial Infarction (TIMI) flow grade, no-reflow, ST-segment resolution], hemodynamics, biomarkers, and clinical events were analyzed as secondary/exploratory outcomes, with multiplicity controlled using the Benjamini–Hochberg false discovery rate (FDR) where applicable.ResultsBaseline characteristics were balanced between groups. Compared with control, intracoronary nicorandil was associated with a higher rate of post-PCI TIMI grade 3 flow (96.9% vs. 74.2%; overall P = 0.013). Final AMR was significantly lower in the nicorandil group (1.4 ± 0.5 vs. 2.7 ± 0.5; P 
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