An occlusion-focused triage approach sent more non-ST-elevation patients to early angiography

Design

Substudy of a multicentre cluster-randomised trial (DIFOCCULT-3)

Population

4,398 consecutive adults without diagnostic ST elevation on the admission ECG

Primary outcome

Immediate invasive management within 2 hours and adjudicated acute coronary occlusion

Effect

Early invasive management 45.4% vs 13.6%; occlusion identified within 2 hours 35.1% vs 16.7% (both P < 0.001)

DIFOCCULT-3 was a cluster-randomised trial comparing conventional STEMI/NSTEMI classification with an occlusion/non-occlusion myocardial infarction approach, which uses the electrocardiogram to look for signs of acute coronary occlusion even without diagnostic ST elevation. This substudy included 4,398 patients without diagnostic ST elevation.

Under the occlusion-focused approach, 45.4% had immediate invasive management (within 2 hours) against 13.6% under the conventional framework. Adjudicated acute coronary occlusion was identified within 2 hours in 35.1% against 16.7%, with no loss of angiographic yield. Guideline-defined very-high-risk NSTEMI criteria identified only a small share of patients and were applied inconsistently.

The abstract reports process and diagnostic measures, not mortality or infarct size. Faster identification of occlusion is plausible grounds for benefit, but this analysis does not show that patients did better.

• Look for occlusion signs on the first ECG, such as hyperacute T waves or reciprocal changes, even without ST elevation
• Repeat the ECG when pain continues or changes, rather than relying on one tracing
• Escalate to the interventional team early when the picture suggests occlusion; do not wait only for troponin
• Audit how often your unit applies very-high-risk NSTEMI criteria in practice

Why it matters

It challenges the assumption that ST elevation is the only door to emergency angiography.

Don't overread it

Earlier detection and earlier intervention are not the same as better survival, and clinical outcomes are not in this abstract.

The statistics, in plain English

The figures compare how many patients reached early angiography and how often occlusion was confirmed, which are measures of diagnosis and timing. They are not measures of survival. Cluster randomisation assigns hospitals or teams rather than individuals, so results depend on how consistently each site applied its approach.

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