Time is brain. Every minute of untreated ischemic stroke destroys approximately 1.9 million neurons. The difference between a door-to-CT time of 45 minutes and 20 minutes isn't administrative — it's neurological function the patient either keeps or loses permanently.
The AHA Target: Stroke guidelines set a door-to-CT benchmark of 25 minutes or less. Most high-performing stroke centers hit it consistently. The ones that do aren't smarter — they're more choreographed.
The clock starts before the door
The single biggest gain available to most departments is not inside the hospital at all. It is the pre-notification call.
When EMS calls a stroke alert from the field with a last-known-well time and a stroke scale, the receiving team can assemble, the scanner can be cleared, and the patient can move from the ambulance stretcher toward CT without stopping. When the first anyone hears of it is the patient arriving at triage, you have already lost ten to fifteen minutes that cannot be recovered downstream.
Last known well is the most important number in the entire encounter, and it is the one most often recorded badly. It is not when the patient was found, and not when symptoms were noticed — it is the last moment anyone can attest they were at their neurological baseline. Get the witness's phone number before they leave.
Parallel, not sequential
Slow departments are not doing the wrong things. They are doing the right things one after another. Registration, then triage, then assessment, then labs, then transport, then scan — each step waiting politely for the previous one to finish.
Fast departments collapse that queue. Registration happens with a temporary identifier and gets corrected later. The neurological assessment happens while the patient is moving. Blood is drawn and the IV is placed in the scanner suite, not before leaving for it. Nothing waits for anything else unless it genuinely must.
- Pre-notification triggers assembly, not preparation The alert pages the whole team at once — physician, nurse, CT tech, pharmacy. They converge on arrival rather than being summoned in sequence once the patient is already in a room.
- Do not fully register before scanning A temporary record is enough to order and perform the scan. Complete registration is an administrative need, and it should never sit in front of imaging.
- Skip the room The highest-performing pathway takes the patient from the ambulance stretcher directly to CT. Every transfer onto a bed in a bay is minutes spent, and the assessment can be done at the scanner.
- Assess while moving The stroke scale, the history and the last-known-well confirmation all happen in transit or in the scanner suite. None of them require a stationary patient in a treatment bay.
- Draw blood at the scanner, and do not wait for results Point-of-care glucose is the one result you need immediately, because hypoglycaemia is the great stroke mimic. Most other labs should not hold up imaging or the treatment decision.
- Have the physician read the scan at the console Waiting for a formal report adds delay that the pathway cannot afford. The immediate question is narrow: is there blood?
Check a glucose on every stroke alert, every time, before anyone commits to a diagnosis. Hypoglycaemia produces convincing focal deficits — including dense hemiplegia — and it is fixed in ninety seconds. Missing it is the most avoidable error on this pathway.
Assign a timekeeper, publish the times
Teams do not become fast by intending to be fast. They become fast by measuring, and by being uncomfortable with the number.
Give someone explicit ownership of the clock during every stroke alert — arrival, scan start, scan read, treatment decision. Then review the times as a group afterwards, without blame and without exception. What you will find is that the delays are almost never clinical. They are handoffs, waiting for a bed, waiting for registration, waiting for someone to be found.
Those are all fixable. But only once they are visible.
Run the pathway as a drill on a quiet shift, with a volunteer as the patient. Almost every team that does this discovers at least one structural delay they did not know they had — a badge that does not open a door, a phone nobody answers, a scanner that is routinely occupied at shift change.
Stroke scenarios where the clock is real and the sequencing is yours to get right. Register first and you watch the minutes go. Miss the glucose and the case turns. The choreography becomes something the team has rehearsed rather than something it reads about.
What every clinician should remember
- EMS pre-notification is the largest single time saving available to most departments
- Last known well is the critical number — capture the witness's contact details before they leave
- Run steps in parallel; registration and full labs must never sit in front of imaging
- Check a point-of-care glucose on every stroke alert — hypoglycaemia mimics stroke convincingly
- Assign a timekeeper and review the times openly; the delays are almost always structural, not clinical