ABSTRACT
High-definition mapping of atrial fibrillation is most commonly performed from the endocardial surface. This report describes an example of a case in which combined mapping of the endocardium and epicardium of the left atrium demonstrated electrical dissociation between the 2 surfaces and implies that endocardial mapping alone may not provide sufficient information. (Level of Difficulty: Advanced.).
ABSTRACT
Long-standing persistent atrial fibrillation remains a significant therapeutic challenge, often proving to be resistant to treatment with antiarrhythmic medications and transcatheter ablation. Hybrid ablation, which combines a minimally invasive surgical and transcatheter approach, is emerging as a promising treatment option. In this video tutorial, we demonstrate our method of hybrid ablation for long-standing persistent atrial fibrillation using advanced 3D electro-anatomical voltage mapping to guide the ablation process and thereby improve the ultimate effectiveness of the procedure.
Subject(s)
Atrial Fibrillation/surgery , Body Surface Potential Mapping/methods , Catheter Ablation/methods , Heart Conduction System/physiopathology , Minimally Invasive Surgical Procedures/methods , Surgery, Computer-Assisted/methods , Atrial Fibrillation/diagnosis , Atrial Fibrillation/physiopathology , Heart Conduction System/surgery , Humans , Intraoperative PeriodABSTRACT
MicroRNAs (miRNAs) are a class of small non-coding RNAs which function in gene regulation with an important role in cell proliferation, maturation, and activity. The regulatory role of these small RNA molecules has recently begun to be explored in ovarian cells, uncovering their influence on gonadal development, steroidogenesis, apoptosis, ovulation, and corpus luteum development. This emerging area of research has extended and reshaped our understanding on how ovarian function is regulated. Here, we review the current understanding of miRNA biogenesis, the role and mechanism that miRNAs play in post-transcriptional gene expression regulation, and specifically the current evidence of miRNA involvement in ovarian development and function. Future comprehensive understanding of the role of miRNAs in the ovary in both physiological and pathological conditions may offer new treatment strategies for infertility and other ovarian disorders.
