Atrial functional mitral regurgitation: A cautionary tale?

Key Points Approximately one‐third of patients with functional mitral regurgitation (FMR) have atrial FMR (A‐FMR) and need to be identified. Transcatheter edge to edge repair (TEER) may benefit patients with A‐FMR. Many unknowns remain concerning A‐FMR and TEER which require further investigation.