A reperfusion marker that predicts early deterioration but not three-month outcome

Design

retrospective analysis of a prospective endovascular stroke registry, 2010-2021

Population

229 patients after mechanical thrombectomy with post-contrast FLAIR; mean age 69.7, 52.0% female

Primary outcome

association of reperfusion markers with early neurological deterioration and 3-month outcome

Effect

adjusted odds ratio 3.45 (95% CI 1.33-8.95) for early deterioration; no association with 3-month function

A substantial minority of patients deteriorate or extend their infarct despite successful recanalisation. Post-contrast FLAIR imaging can show a hyperintense acute reperfusion marker, thought to reflect early blood-brain barrier disruption. In 229 consecutive thrombectomy patients from a French endovascular registry imaged 4 to 48 hours after gadolinium, the marker was present in 48.9% and ocular gadolinium leakage in 41.9%; 60.3% had one or the other.

The reperfusion marker was independently associated with early neurological deterioration (adjusted odds ratio 3.45, 95% CI 1.33 to 8.95) and infarct growth (2.46, 95% CI 1.22 to 4.95). It was not associated with haemorrhagic transformation or with three-month functional outcome. Ocular leakage, despite being common, predicted nothing. Older age, higher creatinine and a shorter interval between the two FLAIR sequences predicted both markers; single-pass recanalisation predicted the reperfusion marker only.

That last association deserves caution rather than enthusiasm - it may reflect the imaging timing rather than anything about the procedure. And a marker that tracks early deterioration but not three-month function is a marker of a process, not yet a tool for prognosis. Treat a positive finding as a reason to watch the patient more closely over the next 48 hours, not as information to give the family about recovery.

• Read the marker as a short-term deterioration flag, not as a three-month prognostic sign.
• Do not use it in outcome discussions with families - it was not associated with functional outcome.
• Note that the interval between FLAIR sequences predicts the marker, so timing confounds its presence.
• Ocular gadolinium leakage was frequent and predicted nothing; do not report it as significant.
• Consider tighter neurological observation in the first 48 hours where the marker is present.

Why it matters

It separates an imaging sign of reperfusion injury from a prognostic marker, which is the distinction most likely to be lost when the finding reaches a report.

Don't overread it

This is a retrospective registry analysis at a single thrombectomy centre; the associations are adjusted but not causal, and imaging timing confounds marker detection.

The statistics, in plain English

The odds ratio for early deterioration, 3.45, has a confidence interval from 1.33 to 8.95 - clearly above 1.0 but spanning a sevenfold range, which is what 229 patients and a relatively uncommon outcome will support. That the same marker showed no association with three-month outcome is the more important negative: an imaging finding tied to a short-term event but not to recovery has limited use in counselling.

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