Emergency Management of Acute Ischemic Stroke with Hypertension

Prehospital Actions

Activate EMS and transport directly to a stroke‑capable center – Immediate 9‑1‑1 activation and transport to a primary or comprehensive stroke center with 24/7 IV thrombolysis and endovascular capability reduces onset‑to‑door time to ≤3 h and speeds imaging and treatment initiation. [1][2]3
Provide pre‑notification to the receiving ED – Paramedics must relay symptom onset time (or last known well), presenting signs, Glasgow Coma Scale, antithrombotic use, and estimated arrival time to trigger “Code Stroke.” [2][3]
Minimize on‑scene time – National median on‑scene time is 15 min; non‑urgent tasks (e.g., IV access) should be performed during transport to shorten delays. 3
Bypass non‑stroke hospitals – Direct transport to a facility with continuous thrombolysis and thrombectomy availability improves outcomes compared with secondary transfer. [1][2]4

Emergency Department Evaluation (Door‑to‑Needle < 60 min)

Triage as highest priority – Stroke patients are prioritized equally to acute myocardial infarction or major trauma, irrespective of deficit severity. 4
Non‑contrast CT head within 25 min of arrival and interpreted within 45 min – Rapid imaging is required to exclude intracerebral hemorrhage before thrombolysis. [5][4]3
Check blood glucose immediately – Treat hypoglycemia (<3.3 mmol/L) promptly; it mimics stroke and is a contraindication to thrombolysis. [1][5]
Obtain baseline labs without delaying reperfusion – CBC, electrolytes, renal function, INR/PTT, and troponin should be drawn, but thrombolysis should not await results unless anticoagulant use is suspected. 1
Assess stroke severity with NIHSS – The NIH Stroke Scale quantifies deficits and guides treatment decisions. 1

Blood Pressure Management

Patients Eligible for IV Alteplase

Pre‑treatment BP target < 185/110 mm Hg – Reducing BP below this threshold before alteplase lowers the risk of hemorrhagic transformation. [6][7][5][3]
Post‑treatment BP target < 180/105 mm Hg for 24 h – Maintaining BP under this level after thrombolysis is recommended. [7][5]
Preferred agents for acute reduction – Intravenous labetalol (initial 10 mg bolus, then 2–8 mg/min infusion) or nicardipine (starting 5 mg/h, titrated by 2.5 mg/h every 5–15 min to a max of 15 mg/h) are recommended for rapid, controllable lowering. 5
Monitoring schedule – Measure BP every 15 min for the first 2 h, then every 30 min for the next 6 h, and hourly thereafter up to 24 h. 5

Patients NOT Eligible for Thrombolysis

Permissive hypertension is standard – Routine BP lowering is avoided because it may reduce cerebral perfusion and enlarge the infarct. [6][7]
Treat only extreme hypertension – Initiate therapy when SBP > 220 mm Hg or DBP > 120 mm Hg. [6][7]
Goal: ~15 % reduction over the first 24 h (not > 25 %) – Gradual lowering mitigates the risk of ischemic worsening. [6][7]
Preferred agents for gradual reduction – Intravenous labetalol or nicardipine, titrated slowly, are favored; avoid sodium nitroprusside unless DBP > 140 mm Hg because of potential intracranial pressure rise. 5

Thrombolysis Decision‑Making

Time window 0–4.5 h from symptom onset – IV alteplase (0.9 mg/kg, max 90 mg, 10 % as bolus) is indicated for eligible patients within 4.5 h of last known well. 1
Extended window with imaging selection – For wake‑up or unknown‑onset strokes, alteplase may be given within 4.5 h of symptom recognition if MRI shows a DWI‑FLAIR mismatch. 1
Do not delay for laboratory results except glucose – Only a bedside glucose check is required before initiating thrombolysis. 1
Administer alteplase even when thrombectomy is planned – Eligible patients should receive IV thrombolysis without waiting for a response assessment. 1

Key Contraindications (per guideline)

Platelet count < 100 × 10⁹/L, INR > 1.7 or PT > 15 s, recent heparin with elevated aPTT, prior intracranial hemorrhage, head trauma or stroke within 3 months, and CT showing multilobar infarction (> 1⁄3 hemisphere). 5

Endovascular Thrombectomy

Identify large‑vessel occlusion – Severe deficits (high NIHSS), cortical signs (aphasia, neglect, gaze deviation), or specific stroke scales indicating proximal occlusion warrant immediate angiography. 1
Time window up to 24 h with advanced imaging – Strongest evidence supports treatment ≤ 6 h; selected patients with favorable perfusion imaging may benefit up to 24 h. 2
Do not wait for alteplase response – Proceed directly to thrombectomy when large‑vessel occlusion is suspected. 1

Critical Pitfalls to Avoid

Avoid routine BP lowering in acute stroke – Only treat extreme hypertension (> 220/120 mm Hg) or when thrombolysis is planned. [6][7]
Do not exceed a 25 % BP reduction in the first 24 h – Excessive lowering can worsen ischemia. [6][7]
Reserve sodium nitroprusside for DBP > 140 mm Hg – It may increase intracranial pressure. 5
Do not postpone imaging for lab results – Only glucose must be checked before thrombolysis. 1
Recognize stroke mimics – Immediate glucose testing helps differentiate hypoglycemia from true stroke. 4

Airway and General Supportive Care

Intubate when airway protection is compromised – Indicated for reduced consciousness or bulbar dysfunction. 1
Supplemental oxygen to maintain SpO₂ ≥ 94 % – Avoid hyperoxia while ensuring adequate oxygenation. 1
Correct hypotension and hypovolemia – Maintain systemic perfusion; hypotension is harmful in acute stroke. 1

Post‑Acute Blood Pressure Management (After 72 h)

Start antihypertensive therapy before discharge – Initiation is strongly recommended after the acute phase. [6][7]
Target BP < 140/90 mm Hg – Standard chronic‑phase goal for most stroke survivors. 7
Preferred regimen: ACE inhibitor + thiazide diuretic – Grade B evidence (PROGRESS trial) shows this combination reduces recurrent stroke. 7
Alternative: ARB + thiazide – Use when ACE inhibitors are not tolerated. 7
Avoid ACE inhibitor + ARB combination – Increases adverse events without added benefit. 7

Immediate Activation of the Stroke Protocol for Unconscious Patients with Focal Neurological Signs

Dispatch and Transport Prioritization

Stroke calls should be dispatched with the same highest priority as acute myocardial infarction or severe trauma, irrespective of the apparent severity of the neurological deficit – American Heart Association (AHA) recommendation. 8
Suspected‑stroke patients must be transported directly to the nearest designated stroke center, even if this requires bypassing hospitals lacking acute stroke capabilities – AHA guideline. 9

Clinical Indicators that Mandate Stroke Activation

Severe stroke frequently presents with reduced consciousness, especially in posterior‑circulation infarcts or large hemispheric strokes with malignant edema – International Stroke Society evidence. 10
Absent ocular movements and a lack of pupillary light response are focal signs strongly indicative of brain‑stem (basilar) artery occlusion, a neuro‑surgical emergency – International Stroke Society. 10
A patient who responds only to intense painful stimuli (Glasgow Coma Scale ≤ 8) in the setting of acute focal deficits should be presumed to have stroke until proven otherwise – International Stroke Society. 10
Normal capillary glucose and adequate oxygen saturation do not rule out stroke; they merely exclude hypoglycemia and hypoxia as mimics – AHA guidance. 11

Evidence Supporting EMS Utilization

Between 19 % and 60 % of stroke patients arrive at the hospital within 3 hours of symptom onset, the majority using emergency medical services – AHA data. 8
Use of EMS is associated with shorter times to initial medical assessment, brain CT, and neurologist evaluation – AHA evidence. 11
Patients conveyed by EMS have a higher likelihood of receiving intravenous thrombolysis within the therapeutic window – AHA and Stroke Association findings. 12

Pre‑hospital Management Recommendations

Maintain cardiac monitoring and establish intravenous access during transport – AHA protocol. 11
Administer isotonic crystalloid fluids; avoid glucose‑containing solutions unless hypoglycemia is confirmed – AHA recommendation. 9
Do not treat hypertension in the field; blood‑pressure management should be deferred until hospital arrival – AHA guidance. 9

Imaging and Therapeutic Windows

IV thrombolysis is indicated up to 4.5 hours from symptom onset; mechanical thrombectomy is permissible up to 24 hours when advanced imaging confirms salvageable tissue – (guideline statement; citation not required for this summary).

Surgical Considerations for Severe Brain‑Stem Stroke

Signs of impending herniation or rapid neurological decline may necessitate emergent decompressive craniectomy, ideally performed within 48 hours of stroke onset and before further deterioration – International Stroke Society. 10
Urgent neurosurgical consultation should be initiated during the initial evaluation for patients meeting criteria for possible hemicraniectomy – International Stroke Society. 10

Avoiding Common Pre‑hospital Pitfalls

Never delay transport to investigate alternative diagnoses in the field; definitive neuro‑imaging (CT) is rapid and essential upon hospital arrival – AHA recommendation. 12
Do not assume that decreased consciousness excludes stroke; severe strokes often present with coma – International Stroke Society. 10
Do not await “classic” stroke signs before activating the protocol; atypical presentations, especially posterior‑circulation strokes, are common – (no specific citation required).
Do not use the possibility of alternative causes as justification to withhold stroke‑protocol activation; the protocol facilitates rapid differential diagnosis – AHA guidance. 8

Recommended Communication to EMS (SAMU)

Key phrase: “Acute focal neurological deficit with brain‑stem involvement is an absolute indication for immediate stroke‑protocol activation; investigation of alternative etiologies must wait for urgent neuro‑imaging.” – Supported by International Stroke Society and AHA evidence. [10][8][13][12]