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Pressure optimization protocol improves reperfusion success and reduces postdilation in STEMI patientsNew stenting technique improves blood flow after heart attacks

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Key Takeaway
Consider pressure optimization protocol (POP) in STEMI patients to improve reperfusion and reduce postdilation frequency.

This multicenter randomized trial enrolled 607 patients undergoing primary percutaneous coronary intervention (PCI) for ST-segment elevation myocardial infarction (STEMI). The study compared a pressure optimization protocol (POP), where stent inflation is maintained at ≥14 atm until stability, against conventional rapid inflation-deflation stenting.

The primary hierarchical reperfusion endpoint showed significant improvement in the POP arm with a WIN ratio of 1.42 (95% CI: 1.11-1.79; P = 0.004). Specific components included ST-segment resolution ≥70% (+5.70%, 95% CI: -1.89 to 12.56) and final TIMI grade 3 flow (+5.95%, 95% CI: 1.80-10.00). Additionally, the need for postdilation was significantly lower in the POP group (65.3%) compared to the conventional group (91.0%; P < 0.001).

Regarding safety, major adverse cardiovascular events (MACE) were lower in the POP arm (2.0% vs. 4.1%), but this trend did not reach statistical significance (HR: 0.49; 95% CI: 0.18-1.31; P = 0.15). The study is limited by a small sample size for long-term clinical outcomes, and larger trials are required to confirm the impact on long-term safety.

How this fits prior evidence

How this fits prior evidence: This finding addresses a gap in optimizing mechanical techniques during primary PCI for STEMI. While previous coverage noted that intracoronary thrombolysis reduces major adverse cardiovascular events and that ticagrelor reduces mortality and major adverse cardiovascular events compared to clopidogrel, this study specifically evaluates the impact of stent inflation protocols on reperfusion success and postdilation rates.

When someone suffers a heart attack, doctors must act fast to open blocked arteries. A recent study looked at a specific technique called pressure optimization protocol (POP) used during stenting. Instead of quickly inflating and deflating a stent, doctors maintained high pressure until the area became stable. This method aims to ensure the artery stays open more effectively.

The trial included over 600 patients undergoing procedures for heart attacks. The results showed that the POP method led to significantly better blood flow success compared to standard methods. It also cut the need for postdilation—a follow-up step where doctors must manually expand the stent—from about 91% down to roughly 65%.

While the study suggests a trend toward fewer serious complications like stroke or heart attack within 30 days, this specific result was not statistically certain. Because the study had a limited number of patients for long-term tracking, more research is needed to see how these results hold up over several years.

What this means for you:
A steady pressure technique during stenting improves blood flow and reduces the need for extra procedures.

Common questions

How does this new stenting method work?

Instead of quickly inflating and deflating a stent, doctors use a pressure optimization protocol. This means they maintain high pressure until the area is stable for at least 30 seconds. This technique was shown to improve blood flow success rates compared to conventional methods.

Does this method reduce the need for extra procedures?

Yes, the study found that patients using the pressure optimization protocol needed postdilation much less often. Only 65.3% of patients in the new group needed it, compared to 91.0% of those who received the conventional treatment.

Is this method safer for heart attack patients?

The study showed a trend toward fewer major adverse events, such as stroke or heart attack, in the group using the new technique. However, because the sample size was small for long-term tracking, this specific safety result was not statistically significant.

Study Details

Study typeRct
Sample sizen = 307
EvidenceLevel 2
PublishedAug 2026
View Original Abstract ↓
BACKGROUND: Incomplete microvascular reperfusion during primary percutaneous coronary intervention (PCI) for ST-segment elevation myocardial infarction (STEMI) remains a major challenge. OBJECTIVES: This study sought to determine whether the pressure optimization protocol (POP) improves reperfusion outcomes compared with conventional rapid inflation-deflation stenting in patients undergoing primary PCI for STEMI. METHODS: In this multicenter randomized trial with blinded endpoint assessment, patients undergoing primary PCI were assigned 1:1 to POP (stent inflation to ≥14 atm maintained until pressure stability, defined as no pressure drop ≥0.3 atm over 30 seconds) or conventional rapid inflation-deflation stenting. The primary endpoint was hierarchical reperfusion success, analyzed using the Finkelstein-Schoenfeld unmatched WIN ratio: ST-segment resolution ≥70% at 90 minutes, final TIMI grade 3, and absence of slow-flow/no-reflow. RESULTS: Between September 30, 2024, and November 11, 2025, 607 patients underwent randomization (POP arm, n = 307; conventional arm, n = 300). POP improved the primary hierarchical reperfusion endpoint (WIN ratio: 1.42; 95% CI: 1.11-1.79; P = 0.004). The net WIN difference was +12.64% (95% CI: 3.69-20.98), driven mainly by the first 2 hierarchical components, ST-segment resolution ≥70% (+5.70%; 95% CI: -1.89 to 12.56) and final TIMI grade 3 flow (+5.95%; 95% CI: 1.80-10.00). Postdilation was less frequent with POP (213 of 326 stents [65.3%] vs 294 of 323 [91.0%]; P < 0.001). At median follow-up of 30 days (IQR: 29-32), major adverse cardiovascular events (death, myocardial infarction, stent thrombosis, or stroke) occurred in 6 of 307 vs 12 of 300 patients; Kaplan-Meier estimated event rates were 2.0% (95% CI: 0.4-3.5) and 4.1% (95% CI: 1.8-6.3), respectively (HR: 0.49; 95% CI: 0.18-1.31; P = 0.15). CONCLUSIONS: Among patients with STEMI undergoing primary PCI, pressure-optimized stent inflation resulted in significantly higher rates of successful reperfusion than conventional stenting and reduced need for post dilation. A trend toward fewer 30-day major adverse cardiovascular events was observed. Larger trials are warranted to assess effects on longer-term clinical outcomes. (RAPID-POP: A Randomized Controlled Trial; NCT06430892).
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