How is an NIH Stroke Scale (NIHSS) score of 3 classified?

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Last updated: October 31, 2026 • View editorial policy

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Clasificación del NIHSS de 3 Puntos

Un puntaje NIHSS de 3 se clasifica como accidente cerebrovascular menor (minor stroke). 1, 2, 3

Definición y Contexto Clínico

Según las guías internacionales más recientes, un NIHSS ≤3 define consistentemente un accidente cerebrovascular isquémico menor 1, 2, 3. Esta clasificación tiene implicaciones terapéuticas críticas, particularmente para el manejo antiagregante.

Implicaciones Pronósticas

  • Buen pronóstico general: Un puntaje NIHSS <6 predice una buena recuperación 4
  • Variabilidad importante: Más de la mitad de todos los accidentes cerebrovasculares isquémicos presentan severidad leve (NIHSS ≤3) al momento inicial 5
  • Riesgo residual: Aproximadamente 15% de pacientes con NIHSS ≤4 pueden tener mal pronóstico a 3 meses, especialmente en circulación posterior 6

Manejo Específico para NIHSS de 3

Terapia Antiagregante Dual

Para pacientes con NIHSS 0-3 de origen no cardioembólico, se debe iniciar terapia antiagregante dual (aspirina + clopidogrel) dentro de las primeras 12-24 horas 1, 2, 3:

  • Dosis de carga:

    • Aspirina 160-325 mg
    • Clopidogrel 300-600 mg

  • Mantenimiento:

    • Aspirina 81 mg diario + Clopidogrel 75 mg diario
    • Duración: 21-30 días
    • Seguido por monoterapia antiagregante indefinida

Consideraciones Importantes

Advertencia crítica: No confiar únicamente en el puntaje NIHSS total. Los ítems individuales afectados (especialmente síntomas motores derechos, campo visual) pueden predecir peor pronóstico independientemente del puntaje bajo 7. En circulación posterior, un NIHSS de 2-4 puede asociarse con peor pronóstico que el mismo puntaje en circulación anterior 6.

Ventana Terapéutica

Si el paciente se presenta entre 3-4.5 horas del inicio de síntomas, el tratamiento con alteplasa IV puede ser razonable, aunque los riesgos deben sopesarse contra los beneficios potenciales en accidentes cerebrovasculares leves 8.

References

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