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[ MDster Editorial Team ](https://mdster.com/about) · Jun 14, 2026 · 5 min read · 11 [ Reviewed by Dr. Ali Ragab, MBBCH, MSc, MCAI ](https://mdster.com/medical-reviewers/dr-ali-ragab) [Editorial Policy](https://mdster.com/editorial-policy) | [Corrections Policy](https://mdster.com/corrections) [ Board Review ](https://mdster.com/blog?tag=board-review) [ Emergency Medicine ](https://mdster.com/blog?tag=emergency-medicine) [ Stroke ](https://mdster.com/blog?tag=stroke) [ EMS ](https://mdster.com/blog?tag=ems) [ Neurology ](https://mdster.com/blog?tag=neurology) ![Suspected LVO Stroke: EMS Destination, BP, and Reperfusion](https://mdster.com/storage/blog/images/suspected-lvo-stroke-ems-destination-bp-and-reperfusion.jpg) Share this article Share this post On this page 1. [ The Case: A Prehospital Stroke Routing Problem ](#the-case-a-prehospital-stroke-routing-problem) 2. [ Clinical Reasoning: What Is the Mechanism? ](#clinical-reasoning-what-is-the-mechanism) 3. [ Penumbra, Not Just Time ](#penumbra-not-just-time) 4. [ Mothership Versus Drip and Ship ](#mothership-versus-drip-and-ship) 5. [ ED Workup: Parallel, Not Sequential ](#ed-workup-parallel-not-sequential) 6. [ Blood Pressure Before Thrombolysis ](#blood-pressure-before-thrombolysis) 7. [ Reperfusion: Drug, Device, or Both ](#reperfusion-drug-device-or-both) 8. [ After Lysis and Thrombectomy: The First 24 Hours ](#after-lysis-and-thrombectomy-the-first-24-hours) 9. [ Communicating the Destination Decision ](#communicating-the-destination-decision) 10. [ Key Points for Board Exams ](#key-points-for-board-exams) 11. [ Conclusion ](#conclusion) 12. [ Frequently Asked Questions ](#blog-faqs) 13. [ References ](#references-heading) On this page 1. [ The Case: A Prehospital Stroke Routing Problem ](#the-case-a-prehospital-stroke-routing-problem) 2. [ Clinical Reasoning: What Is the Mechanism? ](#clinical-reasoning-what-is-the-mechanism) 3. [ Penumbra, Not Just Time ](#penumbra-not-just-time) 4. [ Mothership Versus Drip and Ship ](#mothership-versus-drip-and-ship) 5. [ ED Workup: Parallel, Not Sequential ](#ed-workup-parallel-not-sequential) 6. [ Blood Pressure Before Thrombolysis ](#blood-pressure-before-thrombolysis) 7. [ Reperfusion: Drug, Device, or Both ](#reperfusion-drug-device-or-both) 8. [ After Lysis and Thrombectomy: The First 24 Hours ](#after-lysis-and-thrombectomy-the-first-24-hours) 9. [ Communicating the Destination Decision ](#communicating-the-destination-decision) 10. [ Key Points for Board Exams ](#key-points-for-board-exams) 11. [ Conclusion ](#conclusion) 12. [ Frequently Asked Questions ](#blog-faqs) 13. [ References ](#references-heading) Aphasia plus dense right hemiplegia 45 minutes from last known well is not a benign stroke alert. This is a dominant hemispheric LVO until proven otherwise, and the first management error may occur before the patient reaches the ED. The Case: A Prehospital Stroke Routing Problem ---------------------------------------------- A 68-year-old woman develops sudden global aphasia and right hemiplegia. GCS is 12, glucose is 7.8 mmol/L, BP is 195/105 mmHg, and LAMS is 4. She takes aspirin but no anticoagulant. EMS is 15 minutes from a PSC and 40 minutes from a CSC. The extra 25 minutes matters, but so does avoiding a second transfer if CTA confirms proximal left MCA or ICA occlusion. Clinical Reasoning: What Is the Mechanism? ------------------------------------------ The syndrome localizes to the dominant anterior circulation. Global aphasia with contralateral motor deficit strongly suggests a proximal left MCA occlusion, often embolic, with threatened cortex extending beyond the infarct core. Important mimics remain on the board-style differential: - Intracerebral hemorrhage - Hypoglycemia or severe metabolic derangement - Seizure with Todd paresis - Complicated migraine - Subdural hematoma - Sepsis or toxic encephalopathy with focal recrudescence The normal glucose and abrupt maximal deficit push ischemic LVO higher. Noncontrast CT still decides hemorrhage versus ischemia; CTA decides whether the transport gamble was correct. Penumbra, Not Just Time ----------------------- The target is ischemic penumbra: electrically silent but structurally viable tissue maintained by collateral flow. In practical terms, reperfusion therapy buys function only if the core has not consumed the territory. Consequently, ED workflow should protect three clocks simultaneously: 1. Onset-to-needle for IV thrombolysis. 2. Onset-to-puncture for EVT. 3. Door-in-door-out if the first facility cannot perform EVT. Mothership Versus Drip and Ship ------------------------------- As of June 2026, AHA/ASA guidance emphasizes local system performance and supports direct transport to the closest EVT-capable hospital for suspected LVO when rapid interhospital transfer is not reliable. In this case, LAMS 4 and only 25 added transport minutes make the CSC route defensible. [\[1\]](#cite-1 "Reference [1]") StrategyMain advantageMain riskDrip and ship to PSCFaster IV thrombolysis and stabilizationTransfer delay before EVTMothership to CSCOne-stop CTA, lysis, and EVTLater IV thrombolysis if eligible Clinical judgment dictates the final call. A PSC with excellent door-in-door-out may outperform a distant CSC in some regions. Conversely, a PSC that routinely holds LVO patients for prolonged transfer activation becomes a time sink. > **Clinical Pearl:** Prehospital LVO scores do not diagnose LVO; they estimate enough probability to justify a systems decision. ED Workup: Parallel, Not Sequential ----------------------------------- The receiving team should have CT cleared before arrival. Registration, pharmacy, neurology, radiology, and neurointerventional activation should occur from EMS prenotification. Minimum high-yield workflow: - Confirm last known well and baseline function. - Repeat glucose and focused contraindication screen. - Obtain noncontrast CT immediately. - Add CTA head/neck for suspected LVO. - Do not delay thrombolysis for routine labs unless anticoagulant exposure or bleeding risk is suspected. - Use perfusion imaging selectively for extended or unclear windows. The EMS report should include age, sex, exact last known well, deficits, LAMS, BP, glucose, antiplatelet or anticoagulant status, witness contact, ETA, and airway concerns. Blood Pressure Before Thrombolysis ---------------------------------- Her BP of 195/105 blocks immediate IV thrombolysis because systolic pressure exceeds the eligibility threshold. Target SBP is less than 185 mmHg and DBP less than 110 mmHg before IV alteplase or tenecteplase, then less than 180/105 mmHg for 24 hours after treatment. [\[2\]](#cite-2 "Reference [2]") Reasonable agents include: - Labetalol 10–20 mg IV over 1–2 minutes; may repeat once. - Nicardipine 5 mg/h IV, titrated by 2.5 mg/h every 5–15 minutes to a maximum of 15 mg/h. - Clevidipine 1–2 mg/h IV, doubled every 2–5 minutes to a maximum of 21 mg/h. If BP cannot be maintained at target, IV thrombolysis should not be administered. Do not overcorrect into hypotension; the penumbra is pressure-sensitive. Reperfusion: Drug, Device, or Both ---------------------------------- For disabling deficits within 4.5 hours, current AHA/ASA guidance endorses either alteplase or tenecteplase when no contraindication exists. EVT is standard for appropriate LVO patients, with selection increasingly driven by vascular and tissue imaging rather than clock time alone. [\[1\]](#cite-1 "Reference [1]") Aspirin use alone is not a contraindication. A CT showing intracranial hemorrhage is. Recent DOAC use, severe coagulopathy, active bleeding, or persistently uncontrolled BP require protocol-specific exclusion. After Lysis and Thrombectomy: The First 24 Hours ------------------------------------------------ The ICU plan is surveillance for hemorrhagic transformation, edema, re-occlusion, access-site bleeding, and reperfusion injury. BP should be monitored every 15 minutes for 2 hours, every 30 minutes for 6 hours, then hourly for 16 hours after thrombolytic initiation. [\[2\]](#cite-2 "Reference [2]") Avoid reflexively driving SBP below 140 after successful reperfusion; 2026 AHA/ASA updates caution that intensive SBP lowering has not improved functional outcome and may cause harm after EVT. [\[1\]](#cite-1 "Reference [1]") Communicating the Destination Decision -------------------------------------- Families deserve transparency, not false certainty. A concise explanation works best: the nearer hospital can start clot-dissolving medication sooner, but the farther center can remove a large clot immediately if present. Avoid disparaging the PSC. Frame the CSC choice around the patient’s severe deficits, high LVO probability, and the risk of losing time during transfer. Key Points for Board Exams -------------------------- - Sudden aphasia plus contralateral hemiplegia suggests dominant anterior circulation LVO. - LAMS 4 supports direct EVT-capable destination when regional protocols allow. - Thrombolysis BP target is less than 185/110 before treatment and less than 180/105 afterward. - Noncontrast CT excludes hemorrhage; CTA identifies the target lesion. - EMS prenotification should include last known well, LVO score, BP, glucose, anticoagulants, and ETA. Conclusion ---------- This case is not simply PSC versus CSC. It is a systems-of-care problem where physiology, imaging access, transfer reliability, and BP control intersect. The best Emergency Medicine answer is fast, protocol-aligned, and honest about uncertainty. Frequently Asked Questions ---------------------------- ### Does a high LAMS score prove that the patient has a large vessel occlusion? No. LAMS estimates LVO probability and supports destination planning, but CTA or equivalent vascular imaging confirms the occlusion. ### Should IV thrombolysis be delayed for CTA in this patient? No, if she is otherwise eligible and noncontrast CT excludes hemorrhage, IV thrombolysis should not be delayed for advanced vascular imaging. ### Is aspirin use a contraindication to alteplase or tenecteplase? Aspirin alone is not a contraindication. Anticoagulant exposure, coagulopathy, active bleeding, uncontrolled BP, or hemorrhage on CT are more important exclusions. ### Why not rapidly normalize the blood pressure before thrombectomy? Excessive BP reduction can worsen collateral-dependent penumbral perfusion. Treat to reperfusion thresholds, but avoid hypotension or aggressive normalization. References (3) ------------------ 1. 1. [ professional.heart.org/en/science-news/2026-guideline-for-the-early-management-of-patients-with-acute-ischemic-stroke/top-things-to-know ](https://professional.heart.org/en/science-news/2026-guideline-for-the-early-management-of-patients-with-acute-ischemic-stroke/top-things-to-know) [↩](#cite-ref-1-1 "Back to text") 2. 2. [ AHA/ASA 2019 Update to the 2018 Guidelines for Early Management of Acute Ischemic Stroke, clinical slide set. ](https://professional.heart.org/en/-/media/PHD-Files-2/Science-News/2/2019/2019-Guidelines-for-the-Early-Management-of-Patients-with-Acute-Ischemic-Stroke-Slide-Set.pdf) [↩](#cite-ref-2-1 "Back to text") 3. 3. [ Prabhakaran S, Gonzalez NR, et al. 2026 Guideline for the Early Management of Patients With Acute Ischemic Stroke. 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