A new disease entity: Atrial functional mitral regurgitation

Area of Science:

• Cardiology
• Cardiac Surgery
• Heart Failure Research

Background:

• Functional mitral regurgitation (MR) traditionally linked to left ventricular (LV) issues.
• Mitral annular (MA) dilatation, especially from left atrial (LA) enlargement in atrial fibrillation (AF), causes a distinct form of MR.
• This distinct MR, termed atrial functional MR (AFMR), occurs even without LV systolic dysfunction.

Purpose of the Study:

• To differentiate between newly recognized AFMR and traditional ventricular functional MR (VFMR).
• To highlight AFMR as a significant cause of heart failure in patients with AF.
• To emphasize AFMR as a key therapeutic target in heart failure management.

Main Methods:

• Review of current literature and understanding of functional MR pathophysiology.
• Comparison of etiological factors and clinical implications of AFMR and VFMR.
• Analysis of MA dynamics, LA influence, and leaflet remodeling in AFMR.

Main Results:

• AFMR involves MA dilatation due to LA enlargement, disrupted MA geometry, reduced MA contractility, and atriogenic tethering.
• Ventricular functional MR (VFMR) is primarily associated with LV dilatation and systolic dysfunction.
• AFMR presents unique mechanisms distinct from VFMR, impacting heart failure progression.

Conclusions:

• AFMR is an important, recently recognized cause of heart failure in patients with AF.
• Distinguishing AFMR from VFMR is critical for targeted therapeutic strategies.
• Further research into AFMR mechanisms and treatments is warranted for improved patient outcomes.