Atrial fibrillation burden: an update-the need for a CHA2DS2-VASc-AFBurden score

Area of Science:

• Cardiology
• Neurology
• Clinical Risk Stratification

Background:

• Atrial fibrillation (AF) is a recognized independent risk factor for stroke.
• Current guidelines classify AF dichotomously (present/absent), with anticoagulation decisions based solely on clinical variables.
• Emerging evidence suggests a continuous relationship between AF burden and stroke risk across various AF phenotypes.

Purpose of the Study:

• To explore the concept of AF burden as a continuous variable in stroke risk assessment.
• To propose a refined risk stratification model, the CHA2DS2VASc-AFBurden score, integrating AF burden with existing clinical scores.
• To review existing literature supporting a biological gradient of stroke risk associated with AF burden.

Main Methods:

• Literature review of studies investigating AF burden and stroke risk.
• Analysis of data supporting a biological gradient in stroke risk related to AF burden.
• Conceptual development of the CHA2DS2VASc-AFBurden score.

Main Results:

• Data indicate a biological gradient where increasing AF burden is associated with higher stroke risk.
• The current binary AF classification may underestimate stroke risk in certain patient groups.
• AF burden can be quantified and integrated into risk assessment models.

Conclusions:

• AF burden represents a significant, quantifiable factor in stroke risk.
• The CHA2DS2DS2VASc-AFBurden score offers a potential method for more personalized stroke risk assessment in AF.
• Individualized stroke risk assessment in AF should consider both clinical factors and AF burden.