Clinical Calculators for Stroke Management

Acute Stroke Assessment

The NIH Stroke Scale (NIHSS) is the most widely used and validated scoring system for quantifying stroke severity, with scores ranging from 0 to 42, and provides critical prognostic information and guides treatment decisions, as recommended by the American Heart Association 1.
Patients with NIHSS <10 have a 60-70% chance of achieving favorable outcomes at 1 year, while those with NIHSS >20 have only a 4-16% chance, indicating large strokes with poor prognosis, according to the American College of Cardiology 1, 2.
The NIHSS evaluates 11 domains, including level of consciousness, orientation and commands, gaze, visual fields, and facial movement, with a score of 0-4 for motor function in arms and legs, as outlined by the American Heart Association 1, 3.

The American Heart Association recommends using the AHA/ACC CV Risk Calculator to identify individuals who could benefit from therapeutic interventions, which estimates 10-year risk for atherosclerotic cardiovascular disease, including stroke 5, 6, 7, 8.
The Framingham Stroke Profile (FSP) calculates sex-specific 10-year cumulative stroke risk using Cox proportional hazards modeling, with independent predictors including age, systolic blood pressure, hypertension, diabetes, smoking, cardiovascular disease, atrial fibrillation, and left ventricular hypertrophy, as recommended by the American College of Cardiology 6, 11.

The CHA2DS2-VASc score is the AHA-recommended tool for informing risk-based anticoagulation decisions in patients with nonvalvular atrial fibrillation, with scoring components including congestive heart failure, hypertension, age, diabetes, prior stroke, vascular disease, and sex category, as outlined by the American Heart Association 9, 10, 12.
Oral anticoagulation is recommended for patients with annual stroke risk ≥2%, generally corresponding to CHA2DS2-VASc score ≥2 in men or ≥3 in women, according to the American College of Cardiology 9, 10.
The HAS-BLED score assesses bleeding risk in anticoagulated AF patients, with scores >2 associated with clinically relevant and major bleeding, and components including hypertension, abnormal renal/liver function, prior stroke, prior bleeding, labile INR, age >65, and antiplatelet/NSAID use, as recommended by the American Heart Association 12.

Several alternative scores exist, including the ATRIA score, GARFIELD-AF score, and R2CHADS2, but have limited validation and are not currently recommended by major guidelines, according to the American College of Cardiology 5, 6, 7.

Risk calculators should not be used as the sole basis for treatment decisions, but rather interpreted in the context of the patient's complete clinical picture, as recommended by the American Heart Association 5, 6, 7, 8.
Risk calculators are not validated across all populations, and most have limited validation in diverse age, sex, and race/ethnic groups, according to the American College of Cardiology 5, 6, 7.