Substrate Targeted Ablation of Atrial Fibrillation Guided by High Density Voltage Mapping: Long-Term Results.

Background: Long-term ablation results for atrial fibrillation (AF) have been disappointing, particularly for non-paroxysmal AF (NPAF). We hypothesize fibrosis in paroxysmal AF (PAF) and NPAF would be reflected in voltage fragmentation and visualized by high density mapping. Targeted ablation of discrete low voltage bridges (LVB) would eliminate endocardial fragmentation and should have a positive effect on long-term sinus rhythm (SR) survival.

US Naval Research Laboratory focus issue: introduction.

Rather than concentrate on a single topic, this feature issue presents the wide variety of research in optics that takes place at a single institution, the United States Naval Research Laboratory (NRL) and is analogous to an NRL feature issue published in Applied Optics in 1967. NRL is the corporate research laboratory for the Navy and Marine Corps. It conducts a broadly based multidisciplinary program of scientific research and advanced technological development in the physical, engineering, space, and environmental sciences related to maritime, atmospheric, and space domains.

Optics research at the U.S. Naval Research Laboratory.

The Naval Research Laboratory (NRL) was established in Washington, DC in 1923 and is the corporate laboratory for the U.S. Navy and Marine Corps.

Direct visualization of the slow pathway using voltage gradient mapping: a novel approach for successful ablation of atrioventricular nodal reentry tachycardia.

Aims: Ablation of atrioventricular nodal reentry tachycardia (AVNRT) has become treatment of choice because of a high success and low complication rate. Most ablations are successful in utilizing an anatomic approach, but anatomic variance, unusual pathway locations, or multiple pathways may complicate the procedure. Visualization of the slow pathway could expedite ablation success and enhance safety.

Assessment of the accuracy of two gutta-percha gauges used to alter gutta-percha tip diameter.

This study sought to compare the accuracy of two gauges used to alter gutta-percha (GP) cone tips. Randomly selected size 20 cones (with tapers of 0.02, 0.