Stroke Assessment: FAST Screening, NIHSS Scoring, and Time-Critical Nursing Interventions

A stroke kills approximately 1.9 million neurons per minute. That number — from a 2006 study by Saver in Stroke — is the single most important fact in stroke nursing because it explains why every other aspect of stroke care is organized around speed. A patient who receives thrombolytic therapy within 60 minutes of symptom onset has dramatically better outcomes than one who receives it at 3 hours. And a patient treated at 3 hours has dramatically better outcomes than one treated at 4.5 hours (the outer limit of the tPA window for most patients). The implications for nursing are concrete: your job in a suspected stroke is to accelerate every step in the chain. Rapid recognition (FAST screening in under 30 seconds), immediate notification (stroke alert activation), focused assessment (NIHSS in under 10 minutes), emergent imaging (CT scan to rule out hemorrhage), and — if the patient qualifies — thrombolytic administration. The target from door to tPA needle is 60 minutes or less. Every minute you shave off this timeline preserves brain tissue that the patient will need for the rest of their life. Here is the uncomfortable reality: the biggest delays in stroke care are not in the ED or the imaging suite. They are in recognition. The patient who wakes up with slurred speech and assumes it will pass. The family member who waits 2 hours to see if the symptoms resolve before calling 911. The triage nurse who attributes facial droop and arm weakness to dehydration or anxiety. Missed recognition is missed treatment, and missed treatment is permanent disability. If you remember nothing else from this guide: when in doubt, activate the stroke alert. A false alarm costs nothing. A missed stroke costs everything. This content is for educational purposes only and does not constitute medical advice.

FAST is the rapid screening tool that every nurse should be able to perform in under 30 seconds on any patient with a sudden neurological change. F — Face: Ask the patient to smile or show their teeth. Look for asymmetry — one side of the face droops, the smile is uneven, or the nasolabial fold (the crease from nose to mouth) is flattened on one side. A central facial droop (forehead spared, lower face affected) is consistent with stroke. A peripheral facial droop (entire side of face including forehead) suggests Bell's palsy or another peripheral cause — but do not rule out stroke on this basis alone. A — Arms: Ask the patient to hold both arms extended in front of them, palms up, with eyes closed for 10 seconds. A positive finding: one arm drifts downward (pronator drift) or cannot be raised at all. The drift indicates motor weakness on that side, which in the context of sudden onset suggests a contralateral brain lesion (a right-sided drift indicates a left brain stroke, and vice versa). S — Speech: Ask the patient to repeat a simple sentence (you cannot teach an old dog new tricks or the sky is blue in Cincinnati). Listen for slurred speech (dysarthria), garbled or nonsensical words (receptive or expressive aphasia), or inability to speak at all (global aphasia). Speech changes in stroke are sudden — they were speaking normally an hour ago, and now they cannot. T — Time: Note the exact time symptoms were first observed or the last time the patient was known to be normal (the last known well time). This is the most critical piece of information for treatment decisions because thrombolytic eligibility is measured from last known well, not from arrival time. If the patient woke up with symptoms, the last known well is when they went to sleep — which may put them outside the tPA window. Any positive finding on FAST in the context of sudden onset warrants immediate stroke alert activation. Do not wait for a full assessment. Do not wait for a doctor to evaluate. Activate the alert, start the NIHSS, and get the patient to CT. NurseIQ includes FAST screening practice scenarios with video-based facial droop and speech assessment exercises.

The NIHSS (National Institutes of Health Stroke Scale) is a standardized 15-item assessment that quantifies stroke severity on a 0-42 point scale. It takes 5-10 minutes to administer and is performed serially — on presentation, at regular intervals during treatment, and at discharge. The serial scores track improvement or deterioration and guide treatment decisions. Scoring overview: 0 = no stroke symptoms. 1-4 = minor stroke. 5-15 = moderate stroke. 16-20 = moderate-to-severe. 21-42 = severe stroke. The score predicts outcomes: patients with NIHSS 0-5 are likely to have good functional recovery. Patients with NIHSS above 25 have a high probability of significant long-term disability or death. The score also influences treatment decisions — some thrombectomy trials used NIHSS ≥ 6 as an inclusion criterion. The 15 items tested: level of consciousness (LOC) and LOC questions and commands (3 items), best gaze (horizontal eye movements), visual fields, facial palsy, motor function of each arm and each leg (4 items), limb ataxia (coordination), sensory, best language (naming, reading, describing a picture), dysarthria (speech clarity), and extinction/inattention (neglect). Each item is scored on a defined scale (typically 0-2 or 0-4) with specific criteria for each score. Common NIHSS pitfalls: testing items in the wrong order (the scale is designed to be administered in sequence — skipping around introduces error), coaching the patient (if the patient cannot perform a task, score the deficit — do not help them or repeat instructions beyond what the protocol allows), and confusing pre-existing deficits with acute findings (a patient with a prior stroke may have baseline deficits that should not be attributed to the current event — document the baseline if known). The NIHSS is a mandatory competency for stroke-certified hospitals, and many facilities require annual NIHSS certification for nurses working in the ED, ICU, and stroke units. NurseIQ includes full NIHSS administration practice with scoring guides and video-based assessment scenarios.

The single most critical imaging result in stroke care is the CT head: is this an ischemic stroke (blocked vessel, 85% of strokes) or a hemorrhagic stroke (ruptured vessel, 15% of strokes)? The treatment for each is not just different — it is opposite. Giving tPA to a hemorrhagic stroke patient is catastrophic because tPA dissolves clots, and a hemorrhagic stroke is already bleeding. The CT must be completed and read before any thrombolytic is administered. Ischemic stroke treatment: the goal is to restore blood flow. Alteplase (tPA) is the standard thrombolytic — administered IV within 4.5 hours of symptom onset (3 hours is the standard window; 3-4.5 hours is extended for selected patients without certain exclusion criteria). The dose is 0.9 mg/kg (max 90 mg), with 10% given as a bolus over 1 minute and the remaining 90% infused over 60 minutes. Nursing responsibilities during tPA infusion: blood pressure monitoring every 15 minutes (target SBP < 180 and DBP < 105 — hypertension during tPA increases hemorrhagic transformation risk), neurological checks every 15 minutes during infusion and for 6 hours after, and immediate infusion stop and provider notification if the patient develops sudden headache, vomiting, or neurological deterioration (signs of hemorrhagic conversion). Mechanical thrombectomy (endovascular clot retrieval) is available for large vessel occlusions within 6-24 hours of symptom onset in selected patients. This extends the treatment window far beyond tPA and can produce dramatic results — a patient with a complete middle cerebral artery occlusion and dense hemiplegia can regain significant function after clot retrieval. Nursing priorities: maintain hemodynamic stability for the interventional procedure, monitor the arterial access site (groin puncture) for bleeding post-procedure, and perform serial neurological assessments. Hemorrhagic stroke treatment: the goal is the opposite — stop the bleeding and reduce intracranial pressure. Thrombolytics are absolutely contraindicated. Blood pressure management is aggressive (target SBP < 140 for intracerebral hemorrhage per AHA/ASA guidelines — tighter control than ischemic stroke). If the patient is on anticoagulants, reversal agents are administered emergently: vitamin K and 4-factor PCC for warfarin, idarucizumab for dabigatran, andexanet alfa for factor Xa inhibitors. Neurosurgical consultation is obtained for large hemorrhages or those with hydrocephalus. NurseIQ includes ischemic vs hemorrhagic treatment algorithm practice, tPA dosing and monitoring scenarios, and post-thrombectomy assessment exercises.