 Relative Atrial Index

The Relative Atrial Index (RAI) is a measurement used in cardiology, particularly in the assessment of atrial stunning or atrial remodeling, often in the context of atrial fibrillation (AF). It helps to evaluate the function and health of the atria, which are the upper chambers of the heart. RAI is typically calculated using echocardiographic data, and it provides insights into the relationship between the size and function of the atria.