chads_65_score: CHADS-65 Score (Canadian Cardiovascular Society)

In cliot: Clinical Indices and Outcomes Tools

CHADS-65 Score (Canadian Cardiovascular Society)

Description

Calculates the CHADS-65 score for atrial fibrillation stroke risk stratification, based on the Canadian Cardiovascular Society (CCS) guidelines. This score modifies the standard CHADS2 score by lowering the age threshold to 65. It is used to guide the decision for Oral Anticoagulant (OAC) therapy.

Usage

chads_65_score(age, chf, hypertension, diabetes, stroke_tia)

Arguments

age	Numeric. Patient age in years. (>= 65 years adds +1 point).
chf	Numeric (0 or 1). Congestive Heart Failure. (1 = Yes, +1 point).
hypertension	Numeric (0 or 1). History of Hypertension. (1 = Yes, +1 point).
diabetes	Numeric (0 or 1). Diabetes Mellitus. (1 = Yes, +1 point).
stroke_tia	Numeric (0 or 1). History of Stroke or TIA. (1 = Yes, +2 points).

Value

A list containing:

CHADS_65_Score	The calculated score (Range 0-6).
Recommendation	Clinical guidance regarding antithrombotic therapy.

References

Andrade JG, et al. 2018 Focused Update of the Canadian Cardiovascular Society Guidelines for the Management of Atrial Fibrillation. Can J Cardiol. 2018;34(11):1371-1392. doi:10.1016/j.cjca.2018.08.026

Examples

# Example 1: High Risk
# 66yo (+1), No other factors
# Score = 1 -> OAC Recommended
chads_65_score(66, 0, 0, 0, 0)

# Example 2: Low Risk
# 50yo, No risk factors
# Score = 0 -> No therapy
chads_65_score(50, 0, 0, 0, 0)

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