What question did this study set out to answer?

To assess whether left ventricular unloading before reperfusion reduces infarct size in anterior STEMI patients without cardiogenic shock.

June 24, 2026European Heart Journal Acute Cardiovascular Care

Time is muscle—or is it? Challenging reperfusion dogma in the STEMI-DTU era

Q: What is the clinical evidence from this study?

Study design: RCT. Population: anterior STEMI without cardiogenic shock (n=527). Intervention: Left ventricular unloading with a trans-valvular microaxial flow pump combined with a 30-min delay to PCI vs. Immediate PCI alone. Primary outcome: Infarct size.

View Full Paper

Ask AI

Bookmark

Key result

Left ventricular unloading with a trans-valvular microaxial flow pump and a 30-minute delay to PCI did not reduce infarct size compared with immediate PCI alone in anterior STEMI without shock.

Why the study?

Does left ventricular unloading with a trans-valvular microaxial flow pump combined with a 30-min delay to PCI reduce infarct size in patients with anterior STEMI without cardiogenic shock?

Key Points

To assess whether left ventricular unloading before reperfusion reduces infarct size in anterior STEMI patients without cardiogenic shock.
Randomized trial with 527 patients assessing left ventricular unloading using a trans-valvular microaxial flow pump
Intervention compared unloading with a 30-min delay to PCI versus immediate PCI
Analysis included bleeding and vascular complications as outcomes.
No reduction in infarct size was observed with unloading compared to immediate PCI
Bleeding and vascular complications were higher in the unloading group, with rates of 30.8%
Challenges identified in patient selection and mechanical support consistency.

Study Design

Type

RCT (n=527)

Multicenter

Yes

Structured PICO

Does left ventricular unloading with a trans-valvular microaxial flow pump combined with a 30-min delay to PCI reduce infarct size in patients with anterior STEMI without cardiogenic shock?

Population

527 patients with anterior STEMI without cardiogenic shock

Intervention

Left ventricular unloading with a trans-valvular microaxial flow pump before reperfusion, combined with a protocolized 30-min delay to percutaneous coronary intervention (PCI)

Comparator

Immediate PCI alone

Outcome

Infarct sizesurrogate

Limitations

Most patients were hypertensive, which negatively affects rotational support pump function due to high afterload.
Without consistent unloading, the 30-min delay period limits mechanical conditioning and may have confounded beneficial effects.
The trial did not mandate a radial-first approach, leading to only 16% of control patients being treated according to guidelines.
The trial used a performance goal for safety outcomes rather than a direct comparison to the control group.
Most patients were hypertensive, which negatively affects rotational support pump function
30-min delay period limits mechanical conditioning without consistent unloading
Control group did not mandate radial first approach, leading to only 16% being treated according to guidelines
Safety outcomes were compared to a performance goal rather than the control group

Discussion

No takes yet. Share an insight, caveat, or question.

Implication

This editorial discussion highlights that left ventricular unloading with delayed reperfusion does not reduce infarct size in anterior STEMI without cardiogenic shock, reinforcing immediate PCI as the standard of care.

Cite This Study

Thevathasan et al. (2026) conducted an RCT in anterior STEMI without cardiogenic shock (n=527). Left ventricular unloading with a trans-valvular microaxial flow pump combined with a 30-min delay to PCI vs. Immediate PCI alone was evaluated on Infarct size. Left ventricular unloading with a trans-valvular microaxial flow pump and a 30-minute delay to PCI did not reduce infarct size compared with immediate PCI alone in anterior STEMI without shock.

synapsesocial.com/papers/6a3c2384d15afadd906fa474 https://doi.org/10.1093/ehjacc/zuag080

Topics

STEMI management Mechanical circulatory support Percutaneous coronary intervention

View Full Paper

Ask AI

Bookmark

Time is muscle—or is it? Challenging reperfusion dogma in the STEMI-DTU era

Key Points

Study Design

Structured PICO

Limitations

Discussion

Implication

Cite This Study

Topics

Time is muscle—or is it? Challenging reperfusion dogma in the STEMI-DTU era

Key Points

Study Design

Structured PICO

Limitations

Discussion

Implication

Cite This Study

Also Consider

Topics

Also Consider