POSTER PRESENTATION Open Access Comparison of electroanatomic voltage mapping with late gadolinium enhancement CMR

Atrial fibrillation (AF) is associated with atrial remodel-ing, including atrial cellular pathology [1,2], left atrial enlargement [3], and low voltage on electroanatomic mapping (EAM)[4]. Recent studies have identified late gadolinium enhancement (LGE) in AF subjects pre-PVI as novel evidence of LA remodeling [5]. One study com-pared voltage by EAM obtained prior to a pulmonary vein isolation (PVI) procedure with the extent of atrial fibrosis using LGE [6]. Our goal was to further correlate EAM voltages with LGE. Methods Sixteen AF patients were imaged on a 1.5T scanner (Achieva, Philips Healthcare, NL) using high resolution LGE [7], prior to their first PVI. Left atrial LGE was obtained using an ECG-triggered, navigator-gated 3D GRE inversion recovery (IR) sequence obtained 10-20 minutes after the administration of 0.2 mmol/kg of Gd-DTPA, with spatial resolution of 1.3 × 1.3 × 4 mm 3. The left atrial cavity and enhanced tissue were segmented on the LGE images, using a threshold corresponding to the signal of enhanced mitral valves. EAM was performed b