Pediatric NIHSS Calculator (PedNIHSS)

Pediatric stroke: rarer, slower to diagnosis, and higher stakes per year of life

Childhood arterial ischemic stroke (roughly 1–2 per 100,000 children per year) is missed or delayed with depressing regularity — median times to diagnosis run around a full day in published cohorts, because hemiparesis in a child gets called migraine, Todd paresis, or conversion long before anyone says stroke, and because stroke mimics genuinely are more common in children. The etiologic landscape differs completely from adults: arteriopathies (focal cerebral arteriopathy, dissection, moyamoya), congenital heart disease, and sickle cell disease dominate, with atherosclerosis essentially absent. The PedNIHSS exists so that severity is documented in a standardized, trackable way across this heterogeneous population — Ichord's multicenter validation showed excellent inter-rater reliability when scored with the age-appropriate task modifications.

Using it honestly

Three cautions. First, the scale is validated for ages 2–18; neonatal stroke — which is more common than childhood stroke — needs different tools entirely. Second, unlike in adults, the score does not gate reperfusion: thrombolysis and thrombectomy in children are individualized, specialist, often off-label decisions (TIPS-era protocols and case series, not RCT thresholds), so the number informs communication and trajectory, not eligibility. Third, the language and cognitive items only work when the examiner anchors to developmental age — a silent two-year-old is not aphasic, and scoring against adult expectations manufactures deficit. When a children's hospital consult is not immediately available, score it, document the modifications used, and get the child to a pediatric stroke pathway.