1,720,985 research outputs found
Single chamber ICD with single-pass AV defibrillation lead. Outcome s of the ADAMO Italian Registry
No full textCardiac resynchronization therapy and mortality reduction in heart failure: A proven association
No full textCardiac resynchronization therapy (CRT) is currently used for treatment of refractory heart failure and is effective in reducing symptoms and increasing quality of life and exercise tolerance. Data from the literature also show that CRT may prolong event-free survival and reduce heart failure mortality. This therapy is also highly cost-effective as compared to optimized medical treatment. The reduction of the risk of death occurs in both nonischemic and ischemic heart failure, although in this latter group CRT benefit seems to be less. It is still controversial whether a back-up defibrillator should be implanted to all patients undergoing CRT. Finally, left ventricular reverse remodeling occurring after 3 to 6 months of treatment predicts long-term benefit of CRT on mortality
Radiofrequency ablation of atrial fibrillation: is the persistence of all intraprocedural targets necessary for long-term maintenance of sinus rhythm?
No full textBACKGROUND - Several approaches have been developed for radiofrequency catheter ablation of atrial fibrillation, but the correct intraprocedural end point is still under debate, and few data exist about the destiny of ablation lesions over time. The aim of the present study was to evaluate the long-term maintenance of intraprocedural end points of ablation procedures. METHODS AND RESULTS - Inclusion criteria were (1) a previous ablation procedure of pulmonary vein (PV) encircling performed for drug-refractory persistent atrial fibrillation; (2) a "complete" intraprocedural end point, which consisted of voltage abatement inside the lesions, PV disconnection, and exit-block pacing from inside the lesions, attained in all PVs; and (3) stable sinus rhythm documented during a minimum follow-up of 2.5 years after the procedure. Twenty volunteers were selected (12 males, mean age 59±7 years) and underwent a repeat electrophysiological study. After a follow-up of 36.4±4.7 months, complete volt..
Paroxysmal atrial fibrillation ablation with the mutlipolar mapping and ablation catheter
No full textPulmonary veins (PVs) ablation is a valid treatment option for atrial fibrillation. The standard approach
for PVs isolation usually requires two catheters or an electroanatomical reconstruction of the left atrium.
We describe our initial experience with a single device for mapping and ablating in a patient referred to our
center for the relapsing of atrial fibrillation 3 years after a previous ablation procedure. The newly available
catheter MESH was safe and effective to quickly isolate two reconnected.
Introduction
Ablation within or around the pulmonary
veins (PVs) is a valid treatment option for atrial fibrillation.
Usually PVs isolation requires the combined
use of a multielectrode catheter for mapping
together with an ablation catheter. Alternatively
a point-by-point mapping and ablation can be
achieved using a three-dimensional nonfluoroscopic
system.1–7
We describe the case of a patient with recurrent
paroxysmal atrial fibrillation subjected to PVs
ablation by using a newly available device that allows
to map and ablate simultaneously with the
same catheter
Diagnosis of mitral valve diseases using indirect (esophageal) left atrial pulse
No full textThe diagnostic usefulness of the indirect (esophageal) left atrial pulse (ESO) has been analyzed in: 1) 25 patients (pts) with mitral insufficiency (MI), 2) 18 pts with mitral stenosis, 3) 29 pts with combined valvular disease, 4) 10 normal subjects. In addition, in 1) and 4), the ESO was recorded under the following dynamic conditions: a) during isometric exercise (handgrip), b) after inhalation of amyl nitrite, c) after intravenous infusion of methoxamine. The ESO tracing demonstrated estimates of the severity of the disease. Under dynamic conditions no modification from the resting morphology was obtained in the control group, whereas in MI the following modifications were observed: a) increased, progressive, positive elevation of the systolic phase of the ESO during the handgrip and the administration of the methoxamine; b) tendency to return to normal morphology after amyl nitrite
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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