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Emergency Medicine · Neurology

Cincinnati Prehospital Stroke Severity Scale (CP-SSS) calculator

Enter the published formula inputs below to calculate and interpret this score.

Clinical inputs

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CP-SSS 0–1 — lower likelihood of severe stroke

Band: CP-SSS 0–1 — lower likelihood of severe stroke

Interpretation. CP-SSS 0–1 — lower likelihood of severe stroke

Suggested management. Below the ≥2 threshold used for severe stroke / LVO screening.

Cincinnati Prehospital Stroke Severity Scale (CP-SSS): 0 — CP-SSS 0–1 — lower likelihood of severe stroke. Interpretation: CP-SSS 0–1 — lower likelihood of severe stroke What to do: Below the ≥2 threshold used for severe stroke / LVO screening. Inputs: Conjugate gaze deviation (+2): false; Arm weakness (cannot hold up) (+1): false; Abnormal LOC questions or commands (+1): false Source: Katz BS et al. Design and validation of a prehospital scale to predict stroke severity: Cincinnati Prehospital Stroke Severity Scale. Stroke. DOI: 10.1161/STROKEAHA.115.008804. PMID: 25899242. Scope: CP-SSS 0–4 — conjugate gaze preference +2 (NIHSS gaze ≥1), arm weakness +1 (NIHSS arm ≥2), abnormal LOC questions or commands +1 (NIHSS LOC ≥1 each); score ≥2 predicts severe stroke (NIHSS ≥15) and supports LVO consideration. (2015)

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Clinical inputs

  • Conjugate gaze deviation (+2)
  • Arm weakness (cannot hold up) (+1)
  • Abnormal LOC questions or commands (+1)

Primary source

Katz BS et al. Design and validation of a prehospital scale to predict stroke severity: Cincinnati Prehospital Stroke Severity Scale. Stroke. DOI: 10.1161/STROKEAHA.115.008804. PMID: 25899242. Scope: CP-SSS 0–4 — conjugate gaze preference +2 (NIHSS gaze ≥1), arm weakness +1 (NIHSS arm ≥2), abnormal LOC questions or commands +1 (NIHSS LOC ≥1 each); score ≥2 predicts severe stroke (NIHSS ≥15) and supports LVO consideration. (2015)

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