cp_sss_stroke_score: Cincinnati Prehospital Stroke Severity Scale (CP-SSS)

In cliot: Clinical Indices and Outcomes Tools

Cincinnati Prehospital Stroke Severity Scale (CP-SSS)

Description

Calculates the CP-SSS score to identify patients with suspected acute ischemic stroke who are at high risk for Large Vessel Occlusion (LVO). This tool helps EMS providers triage patients to the appropriate facility (e.g., Comprehensive Stroke Center for thrombectomy).

Usage

cp_sss_stroke_score(conjugate_gaze_deviation, severe_arm_weakness,
                    loc_questions_incorrect)

Arguments

conjugate_gaze_deviation	Numeric (0 or 1). Presence of conjugate gaze deviation (eyes fixed to one side). (1 = Yes, +2 points).
severe_arm_weakness	Numeric (0 or 1). Presence of severe arm weakness (arm falls to bed before 10 seconds or cannot lift arm). (1 = Yes, +1 point).
loc_questions_incorrect	Numeric (0 or 1). Patient answers 1 or both Level of Consciousness questions incorrectly (Age and Month). (1 = Yes, +1 point).

Value

A list containing:

CP_SSS_Score	The calculated score (Range 0-4).
LVO_Likelihood	"High Likelihood" if Score >= 2, otherwise "Low Likelihood".
Recommendation	Triage guidance based on the score.

References

Katz BS, McMullan JT, Sucharew H, Adeoye O, Broderick JP. Design and validation of a prehospital scale to predict severe stroke. Stroke. 2015;46(6):1508-1512. doi:10.1161/STROKEAHA.115.008804

Examples

# Example 1: High Probability of LVO
# Gaze deviation (+2), Severe Arm Weakness (+1), LOC intact
# Score = 3
cp_sss_stroke_score(1, 1, 0)

# Example 2: Low Probability
# Arm drift only (Severity 0 unless falls rapidly), LOC incorrect (+1)
# Score = 1
cp_sss_stroke_score(0, 0, 1)

cliot documentation built on Dec. 1, 2025, 1:06 a.m.