pasi_score: Psoriasis Area and Severity Index (PASI)

Description

Calculates the PASI score to assess the severity of psoriasis. The body is divided into four sections (Head, Arms, Trunk, Legs). Each section is scored for the severity of erythema, induration, and desquamation (0-4), and the percentage of area affected. The final score ranges from 0 to 72.

Usage

pasi_score(head_erythema, head_induration, head_desquamation, head_area_percent,
           arms_erythema, arms_induration, arms_desquamation, arms_area_percent,
           trunk_erythema, trunk_induration, trunk_desquamation, trunk_area_percent,
           legs_erythema, legs_induration, legs_desquamation, legs_area_percent)

Value

A list containing:

PASI_Score: The calculated total score.
Interpretation: General severity classification (Mild <=5, Moderate 5-10, Severe >10).
Subscores: Breakdown of weighted scores by body region.

Arguments

head_erythema: Numeric (0-4). Severity of redness on the head.
head_induration: Numeric (0-4). Severity of thickness on the head.
head_desquamation: Numeric (0-4). Severity of scaling on the head.
head_area_percent: Numeric (0-100). Percentage of head area affected.
arms_erythema: Numeric (0-4). Severity of redness on upper limbs.
arms_induration: Numeric (0-4). Severity of thickness on upper limbs.
arms_desquamation: Numeric (0-4). Severity of scaling on upper limbs.
arms_area_percent: Numeric (0-100). Percentage of upper limb area affected.
trunk_erythema: Numeric (0-4). Severity of redness on the trunk.
trunk_induration: Numeric (0-4). Severity of thickness on the trunk.
trunk_desquamation: Numeric (0-4). Severity of scaling on the trunk.
trunk_area_percent: Numeric (0-100). Percentage of trunk area affected.
legs_erythema: Numeric (0-4). Severity of redness on lower limbs.
legs_induration: Numeric (0-4). Severity of thickness on lower limbs.
legs_desquamation: Numeric (0-4). Severity of scaling on lower limbs.
legs_area_percent: Numeric (0-100). Percentage of lower limb area affected.

Details

Severity Scores: 0: None 1: Mild 2: Moderate 3: Severe 4: Very Severe

Area Scoring (Internal Conversion): 0%: 0 <10%: 1 10-29%: 2 30-49%: 3 50-69%: 4 70-89%: 5 90-100%: 6

References

Fredriksson T, Pettersson U. Severe psoriasis--oral therapy with a new retinoid. Dermatologica. 1978;157(4):238-244. doi:10.1159/000250825

Examples

Run this code


# Example 1: Severe Psoriasis
# Head: 2,2,2, 50% | Arms: 3,3,3, 60% | Trunk: 2,2,2, 40% | Legs: 4,4,4, 80%
pasi_score(2,2,2,50, 3,3,3,60, 2,2,2,40, 4,4,4,80)

# Example 2: Mild Psoriasis
# Head: 1,0,1, 5% | Arms: 1,1,0, 5% | Trunk: 0,0,0, 0% | Legs: 1,1,1, 10%
pasi_score(1,0,1,5, 1,1,0,5, 0,0,0,0, 1,1,1,10)

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