Symptom onset is the clock that every reperfusion decision runs on, and it is the one most often recorded wrong. The time written in the notes is usually the time of arrival, or the time someone first took the complaint seriously, and in a health system where patients reach hospital through two or three steps those can be hours apart.
Ask it as a specific question, anchored to something the patient remembers: what were you doing, had you eaten, was it light outside. Ask whether there was an earlier episode that settled — stuttering onset changes the interpretation of both the ECG and the lysis window. Then write the time you were told and how you established it.
The decision this feeds is not academic. Beyond twelve hours the case for routine fibrinolysis largely disappears, and between three and twelve hours the balance between lysis and transfer depends on how long the transfer would take. Both of those calculations start from a number someone has to ask for properly.
- Anchor onset to a remembered event rather than accepting a round number.
- Ask specifically about an earlier episode that settled; stuttering onset is common and changes the window.
- Record how the time was established, not just the time.
- Recheck the onset time with a relative if the patient is unwell or unsure.
Why it matters
Every reperfusion decision is calculated from a number that is routinely recorded as the time of arrival instead.
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