Rapid Initial Assessment and Prioritization in Acute Stroke

Initial Clinical Priorities (First 5–10 minutes)

• Airway, breathing, and circulation must be assessed immediately on patient arrival to ensure hemodynamic stability before any further evaluation. 1
• Vital signs—including blood pressure, heart rate and rhythm, temperature, oxygen saturation, and hydration status—should be measured promptly to guide acute management. 1, 2, 3
• Rapid bedside glucose testing is required to exclude hypoglycemia as a stroke mimic. 1, 4
• Determining the exact time of symptom onset (last known well) is the single most critical historical element for eligibility for time‑dependent therapies. 5, 6

History Taking – Medication and Risk Factors

• Current anticoagulant use (warfarin, direct oral anticoagulants, or heparin) must be documented; an INR > 1.7 excludes intravenous thrombolysis. 7
• Current antiplatelet therapy (aspirin, clopidogrel, or dual agents) should be recorded, as it influences treatment decisions. 7
• Ongoing antihypertensive medications and the patient’s blood pressure control status are relevant for acute blood‑pressure management. 7
• Use of stimulants or sympathomimetic drugs (e.g., diet pills, cocaine, amphetamines) should be identified because they may affect both presentation and therapeutic choices. 7
• Presence of atrial fibrillation or any irregular heart rhythm suggests a cardioembolic source and impacts reperfusion strategy. 7
• Traditional vascular risk factors—hypertension, diabetes mellitus, and smoking history—must be documented. 7
• Dementia is associated with cerebral amyloid angiopathy and may influence hemorrhagic risk assessment. 7
• Alcohol or illicit drug use, as well as liver disease or active malignancy, can be linked to coagulopathy and affect treatment safety. 7
• Recent carotid endarterectomy or stenting is a risk factor for post‑procedural intracerebral hemorrhage. 7

Symptom Characteristics

• Sudden onset of neurological deficits strongly favors stroke, whereas a gradual progression points toward alternative diagnoses such as tumor. 5
• If prior similar symptoms resolved completely, the therapeutic clock restarts from the onset of the new episode. 6

Focused Physical Examination

• A systematic head‑to‑toe exam (head, face, neck, cardiac, pulmonary, abdominal, and extremity assessment) is essential to uncover stroke causes, comorbidities, or conditions that may modify acute management. 7, 5
• Specific findings to seek include:
  
  • Signs of head or facial trauma and tongue‑biting (suggesting seizure activity). 5
  • Carotid bruits on auscultation. 5
  • Cardiac murmurs, arrhythmias, or signs of congestive heart failure. 5
  • Pulmonary rales indicating underlying lung disease. 5
  • Skin lesions such as Janeway lesions or Osler nodes that may indicate embolic sources. 5

Neurological Assessment

• The National Institutes of Health Stroke Scale (NIHSS) or Canadian Neurological Scale should be employed to quantify deficits, aid communication, infer vessel occlusion location, estimate prognosis, and guide therapeutic selection. 1, 2, 4, 5
• The NIHSS can be completed within minutes, facilitating rapid decision‑making. 7
• Key NIHSS components include assessment of consciousness level, orientation, facial symmetry, motor strength (arm and leg drift), limb ataxia, sensory perception, language, articulation, and extinction/inattention. 5, 7, 4, 3
• The Glasgow Coma Scale should be recorded for patients with depressed consciousness, particularly when intracerebral hemorrhage is suspected. 7
• Ongoing or recurrent seizure activity must be monitored, as seizures can mimic or coexist with stroke. 1, 2, 3

Laboratory and Bedside Diagnostic Studies

• Initial laboratory panel (performed without delaying imaging or treatment) should include:
  
  • Complete blood count. 4
  • Electrolytes and random glucose. 6
  • Coagulation studies (INR and aPTT); INR is required before thrombolysis in patients on warfarin. 1, 2
  • Renal function (creatinine and eGFR); imaging should not be postponed in disabling strokes despite renal impairment. 1, 2, 3
  • Cardiac troponin, as elevated levels are linked to poorer outcomes. 7
  • Toxicology screen for cocaine and other sympathomimetics. 7
  • Urinalysis, urine culture, and pregnancy test in women of child‑bearing age. 7
• A 12‑lead electrocardiogram should be obtained promptly but must not delay thrombolysis unless the patient is hemodynamically unstable. 1, 2, 3
• Chest radiography is reserved for cases with clinical evidence of acute cardiac or pulmonary disease and may be deferred until after acute treatment decisions. 1, 2, 3

Immediate Neuroimaging

• Emergent neuroimaging (non‑contrast CT or MRI) is required to differentiate ischemic from hemorrhagic stroke and to exclude alternative pathologies. 1, 4
• Vascular imaging (CT‑angiography or MR‑angiography) should be considered to identify large‑vessel occlusion when reperfusion therapy is contemplated. 7

Swallowing Assessment

• A validated swallowing screen should be performed as early as possible (ideally within 24 hours) but must not postpone acute therapeutic decisions; patients remain nil‑per‑os until screening is completed. 1, 2, 3

Critical Pitfalls to Avoid

• Do not postpone neuroimaging or reperfusion therapy for the completion of routine blood work, except when an INR is needed for patients on warfarin. 1, 2, 3
• Do not accept “onset unknown” without exhaustive questioning using time anchors (e.g., phone call timestamps, TV program schedules). 6
• Do not discharge patients with transient ischemic attack from the emergency department without full diagnostic evaluation, functional assessment, secondary‑prevention initiation, and a clear follow‑up plan. 1, 2
• Do not overlook common stroke mimics such as hypoglycemia, seizure, migraine, psychogenic disorders, hypertensive encephalopathy, CNS infection, tumor, or drug toxicity. 5, 6
• Do not rely on severity scales alone for prognosis; they should be integrated with clinical and imaging data. 7
• Prolonged emergency‑department stays worsen outcomes; rapid admission to a stroke unit or neuroscience ICU and initiation of time‑sensitive treatments (blood‑pressure lowering, coagulopathy reversal) should occur in the ED. 7

Key Historical Contraindications and Eligibility Criteria for Acute Ischemic Stroke Reperfusion Therapy

Medication History (Absolute Priority)

• The American Heart Association/American Stroke Association (AHA/ASA) states that current use of anticoagulants (warfarin, direct oral anticoagulants, heparin) and the timing of the last dose directly determine eligibility for intravenous thrombolysis. 8
• Documentation of antiplatelet therapy (aspirin, clopidogrel, dual antiplatelet) is required when assessing acute stroke patients for reperfusion treatment. 8
• For patients on warfarin, an International Normalized Ratio (INR) > 1.7 constitutes an absolute contraindication to thrombolysis. 9
• Presence of a direct thrombin inhibitor or factor Xa inhibitor with elevated sensitive laboratory tests excludes the use of thrombolytic agents. 9

Recent Medical/Neurological Events

• A prior stroke or serious head trauma within the preceding 3 months is an absolute contraindication to intravenous thrombolysis. 8
• Major surgery performed within the past 14 days precludes thrombolytic therapy. 9
• Recent hemorrhage (gastro‑intestinal or genitourinary bleeding within 21 days, or any active bleeding) is an absolute contraindication to thrombolysis. 8
• Myocardial infarction occurring within 3 months is a relative contraindication, requiring individualized risk‑benefit assessment. 10
• Arterial puncture at a non‑compressible site performed within 7 days excludes thrombolysis. 9

Functional Baseline (Pre‑stroke mRS)

• The AHA/ASA recommends that only patients with a pre‑stroke Modified Rankin Scale (mRS) score of 0–1 are eligible for endovascular thrombectomy in the 0–6 hour window. 11
• Patients with a pre‑stroke mRS > 1 have uncertain benefit from endovascular therapy and should be evaluated on a case‑by‑case basis. 11

Clinical Presentation Features that May Indicate Stroke Mimics

• A witnessed seizure at symptom onset may represent a post‑ictal state rather than an acute stroke; however, persistent ischemic deficits still warrant consideration of thrombolysis. 8
• Severe headache, vomiting, or coma on arrival roughly doubles the likelihood that the presentation is due to intracerebral hemorrhage rather than ischemic stroke. 8
• When symptoms improve rapidly but do not fully resolve, thrombolysis remains indicated; if symptoms resolve completely (i.e., a transient ischemic attack), the therapeutic clock restarts from the onset of new symptoms. 12
• Gradual progression of neurological deficits suggests a non‑vascular mimic such as a tumor, prompting further diagnostic evaluation. 12

Additional Absolute or Relative Contraindications

• A history of intracranial hemorrhage is an absolute contraindication to intravenous thrombolysis. 9
• Known intracranial neoplasm, arteriovenous malformation, or aneurysm excludes the use of thrombolytic agents. 9
• Recent intracranial or intraspinal surgery is an absolute contraindication to thrombolysis. 9
• Pregnancy is a relative contraindication; treatment decisions should balance maternal and fetal risks. 13
• Recent pericarditis or a known bleeding diathesis precludes thrombolytic therapy. 10

Vascular Risk Factors Influencing Post‑Acute Management

• Atrial fibrillation or other irregular heart rhythms suggest a cardioembolic source and guide post‑stroke anticoagulation strategies. 8
• In patients with diabetes mellitus and a prior stroke, intravenous thrombolysis is not recommended in the 3–4.5 hour treatment window. 9
• Recent use of stimulants (e.g., cocaine, amphetamines) can precipitate stroke and should be considered when differentiating mimics. 12
• Recent infection or fever may indicate an infectious stroke mimic or endocarditis, influencing diagnostic work‑up. 12

Practical Assessment Tips for History‑Taking

• “Onset unknown” should never be accepted without exhaustive questioning; clinicians should use time anchors (e.g., TV programs, phone calls, bathroom visits) and witness accounts to establish the last known normal time. 12
• For wake‑up strokes, the onset time is defined as the last moment the patient was awake and symptom‑free, not the time the deficit was discovered. 8
• EMS personnel and witnesses are valuable sources of timing and medication information, especially when the patient is aphasic or confused. 8
• Critical exclusion criteria (anticoagulant use, recent surgery, prior intracranial hemorrhage) should be obtained while imaging proceeds; imaging should not be delayed for a complete vascular risk‑factor history. 12
• Headache alone does not rule out ischemic stroke; however, severe headache combined with vomiting, coma, systolic blood pressure > 220 mmHg, or glucose > 170 mg/dL in non‑diabetics raises suspicion for hemorrhage and warrants urgent imaging. 8

Guideline Recommendations for Acute Stroke Evaluation and Management

Immediate Clinical Assessment

Determination of Symptom Onset

Neurological Evaluation

NIHSS Scoring Components (generic examples)

All component definitions are derived from the cited NIHSS literature. 16

Laboratory and Ancillary Testing

Neuroimaging

Blood Pressure Management

Patients Not Eligible for Thrombolysis

Patients Eligible for Thrombolysis

Intravenous Thrombolysis (rtPA)

Endovascular Therapy

Antiplatelet and Anticoagulation Therapy

Neuroprotective Agents

Seizure Management

In‑Hospital Stroke Unit Care

Etiologic Evaluation and Secondary Prevention

Critical Pitfalls to Avoid