Ablation catheter orientation: In vitro effects on lesion size and in vivo analysis during PVI for atrial fibrillation.

Background: Catheter-delivered radiofrequency (RF) lesion formation is a complex phenomenon, and few studies have explored the effect of catheter orientation on lesion size and catheter orientation behavior during pulmonary vein isolation (PVI) procedures. We evaluated the influence of catheter orientation on lesion dimensions in an in vitro experimental setting and investigated the catheter orientation behavior during PVI.

Methods And Results: 72 lesions were created in vitro on a porcine heart using a contact force catheter in a parallel, oblique, and perpendicular tip to tissue orientation.

In Vitro Validation of the Lesion Size Index to Predict Lesion Width and Depth After Irrigated Radiofrequency Ablation in a Porcine Model.

Objectives: In an in vitro model, the authors tested the hypotheses that: 1) lesion dimensions correlate with lesion size index (LSI); and 2) LSI could predict lesion dimensions better than power, contact force (CF), and force-time integral (FTI).

Background: When performing radiofrequency (RF) catheter ablation for cardiac arrhythmias, reliable predictors of lesion quality are lacking. The LSI is a multiparametric index incorporating time, power, CF, and impedance recorded during ablation.

A Nonfluoroscopic Technique for Coronary Arteries Three-Dimensional Mapping during Epicardial Ventricular Tachycardia Ablation.

When performing epicardial ablation of ventricular tachycardia (VT), caution must be taken not to damage the coronary arteries. We report a case in which a new, nonfluoroscopic technique for incorporating an accurate, real-time reconstruction of the main coronary vessels into a three-dimensional electroanatomic map was used for epicardial VT ablation.

Noncontact mapping of left ventricle during CRT implant.

Introduction: Not all candidates for cardiac resynchronization therapy (CRT) are responders at follow-up. Echocardiographic parameters of dyssynchrony do not predict the response. Analysis of electrical properties of left ventricle (LV) by noncontact mapping (NCM) could be useful to better identify candidates for CRT.

Radiofrequency ablation of paroxysmal atrial fibrillation by mesh catheter.

Introduction: Pulmonary veins isolation usually requires a multielectrode catheter for mapping in addition to the ablation catheter. We describe our experience with a new multipolar catheter designed for simultaneous mapping and ablation (MESH, Bard).

Methods And Results: We tested the catheter in 15 patients (mean age 61.

A strategy to offset the extra cost of sirolimus-eluting stent in patients undergoing intervention for acute myocardial infarction.

Objective: To obtain a quantitative estimate of the overall costs and cost effectiveness ratio of sirolimus-eluting stents (SES) implantation and tirofiban infusion compared to abciximab and bare metal stent (BMS) in patients undergoing primary intervention for acute ST segment elevation myocardial infarction (STEMI).

Methods: In the attempt to make the unrestricted use of SES in STEMI patients affordable under the current European reimbursement system, between March 6, 2003, and April 23, 2004, 175 patients with STEMI were randomized to receive tirofiban infusion and SES versus abciximab and BMS as part of the STRATEGY trial. Costs and outcome were monitored for 2 years.

[Markers of coronary damage. From diagnosis to prognosis].

Unlabelled: Cardiovascular disease is a major public health problem. Rapid and accurate diagnosis in the emergency department is essential for timely initiation of treatment, thus any means for improving the speed and accuracy of acute coronary syndrome (ACS) diagnosis can contribute to better clinical and economic outcomes. Measurement of circulating level of troponin has proven to be a sensitive and specific test for cardiac damage detection but they do not discriminate between ischemic and not ischemic etiologies of myocardial injury.

[Efficacy of angiotensin-converting enzyme inhibitors in secondary prevention].

This paper reports the rationale for the cardiovascular protective effects of angiotensin-converting enzyme (ACE) inhibitors and reviews the overall results of recent randomized clinical trials. ACE-inhibitors prevent degradation of bradykinin, exert anti-ischemic action, inhibit thrombosis and platelet aggregation, are antiatherogenic, improve endothelial function and vessel remodeling, and have anti-inflammatory properties. Previous trials have shown that ACE-inhibitors reduce cardiovascular events in patients with heart failure or ventricular dysfunction.