orbit_bleeding_risk_score: ORBIT Bleeding Risk Score for Atrial Fibrillation

In cliot: Clinical Indices and Outcomes Tools

ORBIT Bleeding Risk Score for Atrial Fibrillation

Description

Calculates the ORBIT Bleeding Risk Score to predict major bleeding in patients with atrial fibrillation on oral anticoagulation. The score uses five clinical variables: Older age, Reduced hemoglobin/hematocrit/anemia, Bleeding history, Insufficient kidney function, and Treatment with antiplatelet agents.

Usage

orbit_bleeding_risk_score(age_gt_74, reduced_hemoglobin_or_hct_anemia,
                          bleeding_history, insufficient_kidney_function,
                          treatment_with_antiplatelet)

Arguments

age_gt_74	Numeric (0 or 1). Older Age (>74 years). (1 = Yes, +1 point).
reduced_hemoglobin_or_hct_anemia	Numeric (0 or 1). Reduced hemoglobin (<13 mg/dL for men, <12 mg/dL for women) or hematocrit (<40% for men, <36% for women) or history of anemia. (1 = Yes, +2 points).
bleeding_history	Numeric (0 or 1). Bleeding History (GI bleed, intracranial hemorrhage, or hemorrhagic stroke). (1 = Yes, +2 points).
insufficient_kidney_function	Numeric (0 or 1). Insufficient kidney function (eGFR <60 mg/dL/1.73 m^2). (1 = Yes, +1 point).
treatment_with_antiplatelet	Numeric (0 or 1). Treatment with antiplatelet agents. (1 = Yes, +1 point).

Value

A list containing:

ORBIT_Score	The calculated risk score (Range 0-7).
Risk_Group	Classification (Low: 0-2, Medium: 3, High: 4-7).
Bleeding_Risk	Estimated major bleeding rate per 100 patient-years.

References

O'Brien EC, Simon DN, Thomas LE, et al. The ORBIT bleeding score: a simple bedside score to assess bleeding risk in atrial fibrillation. Eur Heart J. 2015;36(46):3258-3264. doi:10.1093/eurheartj/ehv476

Examples

# Example 1: High Risk
# Anemia (+2), Bleeding Hx (+2), Antiplatelet (+1)
# Score = 5
orbit_bleeding_risk_score(0, 1, 1, 0, 1)

# Example 2: Low Risk
# Age 70 (0), No other risk factors
# Score = 0
orbit_bleeding_risk_score(0, 0, 0, 0, 0)

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