cliot (version 1.0.0)

wells_dvt_score: Wells' Criteria for DVT

Description

Calculates the Wells' Criteria risk stratification score for Deep Vein Thrombosis (DVT). The score classifies patients into 'Likely' or 'Unlikely' probability groups to guide diagnostic testing (e.g., D-dimer vs. Ultrasound).

Usage

wells_dvt_score(active_cancer, paralysis_paresis, bedridden_recently_surgery,
                localized_tenderness, entire_leg_swollen, calf_swelling_gt_3cm,
                pitting_edema, collateral_superficial_veins, history_dvt,
                alternative_diagnosis_likely)

Value

A list containing:

Wells_Score

The calculated score (Range -2 to 9).

Risk_Category

Classification (Unlikely <2, Likely >=2).

Probability

Estimated prevalence of DVT in the risk group.

Arguments

active_cancer

Numeric (0 or 1). Active cancer (treatment ongoing, within 6 months, or palliative). (1 = Yes, +1 point).

paralysis_paresis

Numeric (0 or 1). Paralysis, paresis, or recent plaster immobilization of the lower extremities. (1 = Yes, +1 point).

bedridden_recently_surgery

Numeric (0 or 1). Recently bedridden > 3 days or major surgery within 4 weeks requiring general or regional anesthesia. (1 = Yes, +1 point).

localized_tenderness

Numeric (0 or 1). Localized tenderness along the distribution of the deep venous system. (1 = Yes, +1 point).

entire_leg_swollen

Numeric (0 or 1). Entire leg swollen. (1 = Yes, +1 point).

calf_swelling_gt_3cm

Numeric (0 or 1). Calf swelling > 3 cm compared to the asymptomatic leg (measured 10 cm below tibial tuberosity). (1 = Yes, +1 point).

pitting_edema

Numeric (0 or 1). Pitting edema confined to the symptomatic leg. (1 = Yes, +1 point).

collateral_superficial_veins

Numeric (0 or 1). Collateral superficial veins (non-varicose). (1 = Yes, +1 point).

history_dvt

Numeric (0 or 1). Previously documented DVT. (1 = Yes, +1 point).

alternative_diagnosis_likely

Numeric (0 or 1). Alternative diagnosis at least as likely as DVT. (1 = Yes, -2 points).

References

Wells PS, Anderson DR, Bormanis J, et al. Value of assessment of pretest probability of deep-vein thrombosis in clinical management. Lancet. 1997;350(9094):1795-1798. doi:10.1016/S0140-6736(97)08140-3

Examples

# Example 1: DVT Likely
# Cancer (+1), Swelling >3cm (+1), Tenderness (+1)
# Score = 3
wells_dvt_score(1, 0, 0, 1, 0, 1, 0, 0, 0, 0)

# Example 2: DVT Unlikely
# Recent surgery (+1), but alternative diagnosis likely (-2)
# Score = -1
wells_dvt_score(0, 0, 1, 0, 0, 0, 0, 0, 0, 1)