The Current Guideline Has No Door-to-Needle Number
A short read on where stroke time benchmarks actually come from, and what a single late case shows and doesn't show. A composite of cases I see repeatedly, with no detail drawn from any actual matter.
An expert report lands on your desk. It records a door-to-needle time of 68 minutes, the interval from the patient's arrival to the moment the clot-dissolving drug reached the vein, and states that the hospital fell outside the 60-minute standard, citing the American Heart Association guideline. The timestamps are not in dispute.
Is the report correct that a standard was missed? It is right about the minutes but wrong about the document. Sixty minutes is the 2013 figure. The current 2026 edition carries no numeric door-to-needle target at all, only a recommendation that hospitals track the interval. A benchmark quoted from that edition is quoted from a document that does not contain one. The same confusion runs through the imaging interval: 45 minutes was never a target for getting the scan done. It was the 2013 target for reading it. Acquiring the scan and interpreting it are separate intervals, held in separate fields of the record, and a benchmark quoting one figure for both belongs to neither.
Does that mean the interval doesn't matter? No, and the opposite error starts exactly here. In a national registry analysis, faster treatment tracked lower mortality, less bleeding into the stroke, and a greater chance of going home, incrementally and with no threshold anywhere in the curve. Speed carries real weight. What it doesn't carry is a number, a single chart either met or breached.
Consider the mirror image. Another report answers the same allegation by showing the hospital met its imaging benchmark in more than half of its stroke patients that year and treats the case as closed. These figures are written as system targets with a compliance threshold, not as per-patient deadlines. A proportion lives in a quality report. The case lives in two timestamps in one chart. Neither answers the question the other asks.
So the question underneath a stroke timing opinion is narrower than either report makes it: not whether the interval was long, but which edition governed on the date of care, whether that edition contains a number for the interval being measured, and whether the number quoted is a per-patient deadline or a population metric.
Three things follow for a reviewer. A time benchmark should be traced to the edition that contains it before it is treated as a standard, because the figures moved and they measure different things. A hospital's compliance rate and a patient's chart are different pieces of evidence and cannot answer each other. And an opinion quoting a superseded edition has shown that the check was never run, which goes to the opinion rather than to the defendant.
Underneath the benchmark dispute sits a harder question. An interval can only be argued once somebody recognized the stroke, and often nobody did: a third of missed strokes arrived while a treatment window was still open.
— T.B.K
Tobias B. Kulik, MD, FAAN
CorteXion LLC · Scientia et Veritas
The Commentary in this month's Writings
Delayed Stroke Diagnosis: What the Timestamps Cannot Show — cortexion.co/writings/delayed-stroke-diagnosis
Primary source
Prabhakaran S, Gonzalez NR, Zachrison KS, et al. 2026 Guideline for the Early Management of Patients With Acute Ischemic Stroke: A Guideline From the American Heart Association/American Stroke Association. Stroke. 2026;57:e316-e436. doi:10.1161/STR.0000000000000513
A note on cadence. The CorteXion Brief is monthly, occasionally twice in a month when the docket warrants it. One question per issue, no drip sequences, no scheduled series. If you prefer not to receive future issues, you may unsubscribe below.
