AIMS Obtaining optimal pulmonary vein (PV) occlusion with the endoscopic laser balloon ablation system (EAS) can be difficult, hypothetically influenced by PV geometry. The aim of this study was to determine the impact of PV orientation on atrial fibrillation (AF)-free survival after PV isolation (PVI) using the EAS. METHODS AND RESULTS Forty-three patients undergoing a single EAS PVI were in...

BACKGROUND The perfusion index (PI), derived from the pulse oximetry signal, has been shown to be an accurate predictor for identifying high illness severity in neonates. The plethysmographic variability index (PVI) is a measure of the dynamic change in PI occurring during a complete respiratory cycle. OBJECTIVES The aim of this study was to establish the reference range of PVI in spontaneous...

BACKGROUND AND PURPOSE The PVI(CC) of the craniospinal compartment defines the shape of the pressure-volume curve and determines the damping of cyclic arterial pulsations. Despite no reports of direct measurements of the PVI(CC) among healthy elderly, it is believed that a change away from adequate accommodation of cardiac-related pulsations may be a pathophysiologic mechanism seen in neurodege...

BACKGROUND Few data exist on dynamic variables predicting fluid responsiveness during laparoscopic surgery. The aim of this study was to explore the effects of laparoscopy on four dynamic variables: respiratory variations in pulse pressure (ΔPP), stroke volume variation by Vigileo/FloTrac (SVV (Vigileo) ), pleth variability index (PVI) and respiratory variations in pulse oximetry plethysmograph...

BACKGROUND The second-generation cryoballoon is effective in achieving acute pulmonary vein isolation (PVI) and favorable clinical outcome. To date, no data are available on factors affecting late PV reconnection after second-generation cryoballoon ablation. METHODS AND RESULTS A total of 29 consecutive patients (25 male, 86.2%; mean age 57.8±13.8 years) underwent a repeat procedure, after a ...

BACKGROUND Pulmonary vein antrum isolation (PVI) as a treatment of paroxysmal atrial fibrillation (AF) is associated with a high rate of success; however, outcomes for treating persistent and long-standing persistent AF with PVI alone are substantially lower and often require multiple procedures to maintain long-term freedom from atrial arrhythmias. Foci and/or substrate outside the pulmonary v...

BACKGROUND Cardiac CT angiography (CCTA) has become an important adjunct in the structural assessment of the pulmonary veins (PV) prior to pulmonary vein isolation (PVI). Published data is conflicting regarding a relationship between left atrial appendage (LAA) and the risk of ischemic stroke (CVA) following PVI. We investigated the associations of volumetric and morphologic left atrial (LA) an...

Background: Hypotension occurs commonly during caesarean section under spinal anaesthesia. As the onset may be rapid, it may fail to be detected by non-invasive blood pressure (BP) measurement in a timely fashion. Pulse oximeters can continuously and non-invasively measure tissue perfusion (perfusion index (PI)) and its variation with the respiratory cycle (pleth variability index (PVI)). As wi...

Atrial fibrillation (AF) is a major public health issue worldwide, the incidence of which is likely to continue to rise. With the birth of pulmonary vein isolation(PVI), cardiac ablation has emerged as key strategy for the treatment of AF. PVI using traditional point by point radiofrequency ablation is time consuming and technically challenging. Refining patient selection for PVI also remains a...

In this article, we propose a new representation of Lax type for the sixth Painlevé equation. This representation, formulated in the framework of the loop algebra so(8)[z, z−1] of type D (1) 4 , provides a natural explanation of the affine Weyl group symmetry of PVI. After recalling a standard derivation of PVI, we describe in Section 2 fundamental Bäcklund transformations for PVI. In Section 3...