نظرة سريرية عامة

The National Institutes of Health Stroke Scale is a standardized neurologic examination that quantifies deficits relevant to acute stroke. It samples consciousness, gaze, visual fields, facial movement, strength in each limb, ataxia, sensation, language, speech clarity, and neglect. The resulting 0–42 score supports baseline documentation, communication between teams, serial monitoring, prognostic research, and assessment around reperfusion therapy. It does not diagnose stroke and should not postpone brain or vascular imaging.

Accurate use requires formal training and the standardized examination instructions, picture, naming, and sentence materials. Score what the patient does, not what the examiner believes the patient could do. Administer items in order, avoid coaching beyond permitted prompts, and record the first response except where the protocol specifies otherwise. Document time, dominant side, relevant disability, intubation, language barrier, amputation, and other factors that make an item untestable.

دواعي الاستخدام

• Baseline deficit assessment in suspected acute stroke
• Serial assessment before and after reperfusion treatment
• Standardized clinical communication and research

القيود والسلامة

The NIHSS weights anterior-circulation findings and language or dominant-hemisphere deficits more heavily than some posterior-circulation findings. A patient with disabling gait ataxia, vertigo, dysphagia, diplopia, cognitive change, or isolated hand weakness may have a low score. Conversely, previous neurologic deficits can elevate the baseline. Never use a low NIHSS to rule out stroke, large-vessel occlusion, or a clinically disabling deficit.

Severity bands are convenient descriptions, not universal treatment cutoffs. Reperfusion eligibility depends on symptom timing, whether deficits are disabling, imaging, contraindications, premorbid function, and local or national protocol. Patients with low scores may still benefit from treatment in selected contexts, while a high score alone neither confirms large-vessel occlusion nor determines thrombectomy eligibility. Any sudden deterioration should prompt immediate reassessment for hemorrhage, edema, seizure, re-occlusion, hypoglycemia, or another complication.

• Formal scoring requires trained administration of standardized prompts and visual materials
• Posterior circulation and right-hemisphere deficits may be underrepresented
• Never delay emergency imaging or reperfusion workflow to complete the score

المعادلة

NIHSS total = sum of 15 scored neurologic items; conventional total range 0–42

تفسير النتائج

• 0 — No deficit detected by NIHSS: Stroke is still possible; posterior and subtle deficits may be missed. Continue diagnostic stroke pathway when clinical suspicion remains.
• 1–4 — Minor stroke range: May still represent a disabling or large-vessel event. Assess disability, timing, imaging, and reperfusion eligibility.
• 5–15 — Moderate stroke range: Increasing likelihood of significant functional impact. Urgent specialist evaluation and reperfusion/LVO pathway.
• 16–20 — Moderate–severe: High risk of major disability and complications. High-acuity monitoring, airway vigilance, and urgent stroke treatment.
• 21–42 — Severe stroke range: High morbidity and mortality risk. Immediate comprehensive stroke and critical-care management.

المراجع

1. Brott T, et al. Measurements of acute cerebral infarction: a clinical examination scale. Stroke. 1989.
2. Lyden P. Using the NIH Stroke Scale: A Cautionary Tale. Stroke. 2017.
3. AHA/ASA Guideline for Early Management of Acute Ischemic Stroke.

الأسئلة الشائعة

Can an NIHSS of 0 rule out stroke?

No. Posterior circulation stroke and subtle but disabling deficits may score zero. Use history, full neurologic examination, glucose testing, and urgent imaging.

Does a score below 5 mean thrombolysis is contraindicated?

No. Treatment depends particularly on whether the deficit is disabling, as well as time, imaging, bleeding risk, and the applicable stroke protocol.

Can this calculator replace NIHSS certification?

No. It totals selected responses, but reliable administration requires standardized training, official examination materials, and adherence to scoring instructions.