An early-window stroke question can make IV thrombolysis and thrombectomy look like competing choices. The more useful reading is often that they are parallel decisions: assess for IV thrombolysis now, and evaluate for endovascular treatment without letting one pathway delay the other.
Consider an illustrative, deliberately incomplete MCQ stem: a patient is 55 minutes from last known well. The CT shows no hemorrhage, blood pressure is 176/98 mmHg, glucose is 6.4 mmol/L, and no anticoagulant use is reported. Those details support urgent assessment—but they do not, by themselves, establish complete eligibility. The stem does not describe the neurologic deficit or whether it is disabling, nor does it provide a full medication history or contraindication review.
Read the clues without overreading them
The 2026 AHA/ASA acute ischemic stroke guideline recommends starting IV thrombolysis as quickly as possible for eligible adults within 4.5 hours, with treatment recommended for disabling deficits; IV thrombolysis is not recommended for mild, non-disabling deficits in this window. The guideline also advises against delaying eligible IV thrombolysis for additional multimodal imaging. When a patient is eligible for both IV thrombolysis and endovascular thrombectomy (EVT), it recommends giving IV thrombolysis promptly, without waiting to see whether the patient improves before proceeding with EVT.
| Stem detail | What it supports | What it does not establish |
|---|---|---|
| 55 minutes since last known well | The patient is within the usual early IV-thrombolysis window; act promptly | Eligibility, which depends on the full clinical picture |
| No hemorrhage on noncontrast CT | A key imaging requirement for considering IV thrombolysis is met | Whether there is a large-vessel occlusion or a complete diagnosis |
| BP 176/98 mmHg; glucose 6.4 mmol/L | The blood pressure is below the usual 185/110 mmHg pretreatment threshold; the glucose is not low | That all treatment criteria are satisfied |
| No anticoagulant use reported | No use has been reported so far | A reconciled medication history or exclusion of every relevant risk |
The board-ready answer is therefore conditional, not hesitant: complete the IV-thrombolysis eligibility check immediately; if the deficit is disabling and no contraindication applies, give IV thrombolysis promptly, while arranging vascular imaging and EVT assessment in parallel when indicated. Do not invent a large-vessel occlusion from a plain CT, and do not turn “no anticoagulant reported” into a confirmed medication reconciliation.
Three reasoning errors to catch
Treating reperfusion options as either/or. A possible thrombectomy transfer is not, by itself, a reason to skip IV thrombolysis in a patient eligible for both. Likewise, do not wait after IV thrombolysis to see whether the examination improves before moving the EVT pathway forward.
Mistaking supportive details for a completed checklist. A negative CT, blood pressure below the usual threshold, and non-low glucose address important points. They do not answer whether the symptoms are disabling, whether the history reveals a relevant exclusion, or whether vascular imaging supports EVT. The question stem may be designed to test the next decision, but it has not supplied every fact needed for certainty.
Treating the time window as spare time. Being well inside the window is a reason to move efficiently, not to wait for every parallel workup to finish. Conversely, the clock alone does not establish eligibility: the clinical deficit and the full review still matter.
A six-minute retrieval drill for the two-track decision
This is a revision exercise, not an exam timing rule. Close your notes and spend one minute writing a single-sentence response to the vignette. Include both parts: what happens to IV-thrombolysis assessment now, and what happens to EVT evaluation.
For the next two minutes, sort the stem into two columns: supports acting quickly and still needs checking. Put the time, CT, blood pressure, glucose, and reported medication history in the first column where appropriate. Put the nature and functional impact of the deficit, the complete medication history, other eligibility details, and evidence of a treatable arterial occlusion in the second.
Now test whether you have learned the reasoning rather than memorized the wording. If vascular imaging shows a proximal occlusion, does that make IV thrombolysis unnecessary for an otherwise eligible patient? No: it adds an EVT pathway. If the deficit is mild and non-disabling, would the same IV-thrombolysis conclusion automatically hold? No: the missing clinical detail changes the decision.
Use the final minute to compare your answer with the current guideline and mark the first error, if any: false competition, checklist closure, or unearned certainty. Retrieval practice means trying to recall and apply the rule before rereading it; checking the rationale helps identify and correct a gap. A completed question count is not a substitute for knowing which fact changed your decision.
Practical takeaways
- In an early-window MCQ, separate the immediate IV-thrombolysis decision from the parallel EVT assessment.
- A normal CT, an acceptable blood pressure, and a non-low glucose support assessment; they do not prove full eligibility.
- If eligible for both treatments, current AHA/ASA guidance supports prompt IV thrombolysis without waiting for clinical response or delaying EVT.
- Practise retrieving the two-track answer, then change one stem detail to see whether the decision actually changes.
