Abnormal left atrium morphology Left atrial fibrosis 2024-04-03T07:43:55Z Atrial fibrosis is an hallmark of atrial structural remodelling, characterized by the aberrant activation, proliferation and differentiation of fibroblasts, and subsequent excessive synthesis and irregular deposition of extracellular matrix proteins. Atrial fibrillation (AF) is one of the most common tachyarrhythmias observed in the clinic and is characterized by structural and electrical remodelling. Atrial fibrosis, an emblem of atrial structural remodelling, is a complex multifactorial and patient-specific process involved in the occurrence and maintenance of AF.