Search results for "ABLATION"

Reliable Paroxysmal Atrial Fibrillation Substrate Assessment During Sinus Rhythm Through Optimal Estimation of Local Activation Waves Dynamics

2020

[EN] The analysis of coronary sinus (CS) electrograms (EGMs) during catheter ablation (CA) of atrial fibrillation (AF) is highly important for AF substrate evaluation. However, channels of the CS catheter may be affected by vigorous cardiac movement and bad contact. This work investigates the most reliable channels in preserving the AF dynamics during sinus rhythm (SR). Local activation waves (LAWs) were detected in 44 bipolar CS recordings of 60-300 seconds duration in 28 paroxysmal AF patients undergoing CA. Recordings consisted of five channels: distal, mid-distal, medial, mid-proximal and proximal. LAW duration, amplitude, area and correlation between dominant morphologies of each chann…

Variability in δ13C values between individual Daphnia ephippia: Implications for palaeo-studies

2018

The stable carbon isotope ratio (δ13C value) of Daphnia spp. resting egg shells (ephippia) provides information on past changes in Daphnia diet. Measurements are typically performed on samples of ≥20 ephippia, which obscures the range of values associated with individual ephippia. Using a recently developed laser ablation-based technique, we perform multiple δ13C analyses on individual ephippia, which show a high degree of reproducibility (standard deviations 0.1–0.5‰). We further measured δ13C values of 13 ephippia from surface sediments of three Swiss lakes. In the well-oxygenated lake with low methane concentrations, δ13C values are close to values typical for algae (−31.4‰) and the rang…

Intraoperative cryoablation of atrial fibrillation with the old-fashioned cryode tips: a simple, effective, and inexpensive method.

2006

Nowadays atrial fibrillation is usually treated simultaneously with cardiac procedures, and new cryo-systems have been developed for performing easier and faster intraoperative ablation. However, the old cryode designs can still be useful in surgical practice and represent a more cost-effective method. In this article we present a technique using old-fashioned cryodes for intraoperative treatment of atrial fibrillation and comment on its advantages and limitations.

Device Therapy for Rate Control: Pacing, Resynchronisation and AV Node Ablation

2017

Atrioventricular node ablation (AVNA) is generally reserved for patients whose atrial fibrillation (AF) is refractory all other therapeutic options, since the recipients will often become pacemaker dependent. In such patients, this approach may prove particularly useful, especially if a tachycardia-induced cardiomyopathy is suspected. Historically, an "ablate and pace" approach has involved AVNA and right ventricular pacing, with or without an atrial lead. There is also an evolving role for atrioventricular node ablation in patients with AF who require cardiac resynchronisation therapy for treatment of systolic heart failure. A mortality benefit over pharmacotherapy has been demonstrated in…

Is a 1-cm margin from major vessels adequate for radiofrequency ablation of pulmonary neoplasms?

2009

Curative therapies for hepatocellular carcinoma: an update and perspectives.

2015

Curative treatments, including liver transplantation, surgical resection and percutaneous treatments, are the recommended therapies in BCLC-0 (Barcelona Clinic of Liver Cancer) or BCLC-A hepatocellular carcinoma (HCC). This review provides an overview of some issues of clinical importance concerning curative treatments in HCC.

Development of accelerator mass spectrometry assisted by isotope-selective laser photodetachment for monitoring 129I

2013

Abstract A prototype system was developed to investigate an isotope-selective laser photodetachment technique for a 129 I accelerator mass spectrometer. A pulsed ion source for negative iodine ions (I − ) that employed laser ablation proved to be suitable for isotope-selective laser photodetachment. Laser photodetachment of pulsed negative iodine ions was estimated to have an efficiency of about 81% based on a model calculation for the prototype system with a tunable pulsed Ti:sapphire laser.

Commentary on: Microwave Ablation for Metastatic Spinal Tumors

2021

Radiofrequency thermal ablation vs percutaneous ethanol injection for small hcc in cirrhosis:metanalysis of randomized controlled trials

2009

1. Am J Gastroenterol. 2009 Feb;104(2):514-24. Epub 2009 Jan 13. Radiofrequency thermal ablation vs. percutaneous ethanol injection for small hepatocellular carcinoma in cirrhosis: meta-analysis of randomized controlled trials. Orlando A, Leandro G, Olivo M, Andriulli A, Cottone M. Department of Medicine, Pneumology and Nutrition Clinic, V. Cervello Hospital, University of Palermo, Piazza Mameli 1, Palermo, Italy. ambrogiorlando@tiscali.it OBJECTIVES: Radiofrequency thermal ablation (RF) and percutaneous ethanol injection (PEI) have been employed in the treatment of small hepatocellular carcinoma (HCC) as curative treatments. The aim of the study was to review the available evidence compari…

La termoablazione nel trattamento delle neoplasie epatiche primitive e secondarie

2004

Radiofrequency thermoablation is a locoregional procedure based on the use of electromagnetic waves that induce movement and consequently the production of heat. This is the basis for the coagulative necrosis produced in the tissues. The method, experimented with and developed in the '90s, is today extensively used in the treatment of focal hepatic lesions, both primary and secondary. The factors that condition the procedure are related essentially to the characteristics of the tumours and to the possibility of obtaining a predictable area of necrosis that guarantees the radicality of the treatment. As regards primary neoplasms, it should be stressed that the treatment for hepatocellular ca…