Corrected sinus node recovery time as a screening test in patients with typical atrial flutter post-ablation to predict pacemaker implantation.

Objective: The objective of the study was to establish the prognostic value of CSNRT regarding the necessity for pacemaker implantation in patients with atrial flutter (AFL) post-ablation.

Methods: This prospective cohort study, conducted at the National Institute of Cardiology "Ignacio Chavez" in Mexico City, assessed patients who had undergone ablation procedures to correct AFL, posterior to which an autonomic blockade was performed, and CSNRT was measured.

Results: The sample for this investigation was 40 patients.

Use of subcutaneous cardioverter-defibrillator. First cases reported from National Institute of Cardiology Ignacio Chávez-Mexico.

Introduction: The transvenous implantable cardioverter defibrillator (ICD) is the treatment of choice for the prevention of sudden cardiac death (SCD). Its use could be restricted when device-related infections occurs or in the pediatric population. In the later, an ICD represents a challenge, due to the minimal dimensions of the venous system in children, the length of the electrodes, the size of the generator, as well as the anatomical complexity in cases with associated congenital heart disease.

Supraventricular tachyarrhythmia and sinus node dysfunction as a first manifestation of short QT syndrome in a pediatric patient. Case Report.

Short QT syndrome (SQTS) represents a diagnosis challenge where the symptoms may vary from palpitations in an otherwise asymptomatic patient to sudden death. Is a recently discovered rare channelopathy, identified by Gussak in 2000, characterized by short QT intervals on the electrocardiogram and a tendency to develop atrial and ventricular arrhythmias in the absence of structural heart disease, hyperkalemia, hypercalcemia, hyperthermia, acidosis and endocrine disorders. We present the case of a 16-year-old patient with short QT-type channelopathy, who presented with sinus arrest and junctional rhythm, who later developed atrial tachycardia and atrial flutter.

Highlights and comments on EHRA/HRS/APHRS/LAHRS expert consensus on risk assessment in cardiac arrhythmias: use the right tool for the right outcome.

Patients with heart disease, or at high risk of developing a cardiac condition, usually undergo risk assessment by primary care physicians, internal medicine doctors, or cardiologists. There are several methods that can be used for this risk assessment, and their applicability differs with respect to availability, complexity, and usefulness in different geographic populations. This document focuses on some of the many relevant clinical topics recently presented in the "Expert Consensus on Risk Assessment in Cardiac Arrhythmias: Use the Right Tool for the Right Outcome," which include statements based on the best available evidence.

[Prevalence and spectrum of diseases that predispose to sudden cardiac death in Mexican children: a sample obtained from The Federico Gomez Children's Hospital of Mexico].

Objective: To determine the prevalence and spectrum of diseases that predispose to sudden cardiac death in Mexican children, and to identify the main early signs and symptoms that can enable the health personnel to suspect these diseases and to refer the patients to a tertiary hospital in a timely manner.

Methods: Incidence, prevalence, and period prevalence, as well as early symptoms, clinical data, and follow-up were recorded on all children found with diseases that predispose to sudden cardiac death in The Children's Hospital of Mexico.

Results: The study included 59 patients, with a mean age of 8 ± 5 years old, with 40 cardiomyopathies, and 19 with inherited arrhythmogenic diseases.

[Multidisciplinary meeting about the use of direct oral anticoagulants in nonvalvular atrial fibrillation].

Knowing the real impact of atrial fibrillation in the stroke, the Sociedad Mexicana of Electrofisiología y Estimulación Cardiaca (SOMEEC) had the initiative to develop a multidisciplinary meeting of experts the with the purpose to update the available scientific evidence from clinical practice guidelines, meta-analyses, controlled clinical trials, and complementing with the experience and views of a group of experts. To meet this goal, SOMEEC gathered a group of specialists in the area of cardiology, electrophysiology, neurology and hematology that given their experience in certain areas, they share the scientific evidence with the panel of experts to leave open a discussion about the information presented in this article. This document brings together the best scientific evidence available and aims to be a useful tool in the decision to use of new oral anticoagulants in nonvalvular atrial fibrillation and ischemic heart disease, or relating to the management of patients with stroke or renal failure, and even those that will be submitted to elective surgery and invasive procedures.

[Clinical guideline for diagnosis and treatment of atrial fibrillation].

Atrial fibrillation (AF) is associated with long-term increase in the incidence of cerebrovascular disease, heart failure and mortality. The incidence of ischemic stroke in patients with non-valvular atrial fibrillation averages 5 % per year, from two to seven more frequent than in patients without atrial fibrillation (AF). One in six ischemic stroke occurs in patients with AF.

[Design of a multicenter registry to evaluate rhythm versus rate control in atrial fibrillation: Atrial Fibrillation Mexican Registry (ReMeFA)].

Unlabelled: Atrial fibrillation is the most common arrhythmia, predominantly affecting individuals older than 70 years of age. There is little information about its management in Mexico, for this purpose the Mexican Registry of Atrial Fibrillation (ReMeFa) was designed.

Methods: ReMeFA is a prospective multicentric, observational registry concerning the treatment of atrial fibrillation in Mexico.

[Catheter ablation of monomorphic sustained ventricular tachycardia].

The interventional treatment of arrhythmias with catheter ablation have become the first line therapy for a significant number of tachyarrithmias, offering curative treatment in the majority of them. Ventricular arrhythmias form a group of great interest for the interventional electrophysiologist, because in contrast to the traditional thought, today we can identify some sub-groups of monomorphic sustained ventricular tachycardia (MSVT) with very good percentages of cure, whereas others like those with ischemic etiology ablation is still a palliative procedure. In this paper we will review the different types of MSVT, its etiology and therapeutic options from the interventionist point of view.

[Arrhythmias in adults with congenital heart disease].

Unlabelled: Patients with surgical correction of congenital cardiopathies have a high incidence of macro-reentrant arrhythmias. In previous reports the incidence of atrial fibrillation or flutter is around 20% preoperatively and increases to 10% more after surgery. In Mustard and Senning procedures the incidence could be as high as 30%.

Association of congenital, diffuse electrical disease in children with normal heart: sick sinus syndrome, intraventricular conduction block, and monomorphic ventricular tachycardia.

Introduction: Rhythm disturbances in children with structurally normal hearts are usually associated with abnormalities in cardiac ion channels. The phenotypic expression of these abnormalities ("channelopathies") includes: long and short QT syndromes, Brugada syndrome, congenital sick sinus syndrome, catecholaminergic polymorphic ventricular tachycardia, Lènegre-Lev disease, and/or different degrees of cardiac conduction disease.

Methods: The study group consisted of three male patients with sick sinus syndrome, intraventricular conduction disease, and monomorphic sustained ventricular tachycardia.

Non-invasive assessment of endothelial function. Intra and inter-observer variability.

Background And Objectives: Non-invasive evaluation of endothelial function with high resolution ultrasound has become a widely accepted tool in determination of high risk subjects for early atherosclerosis. Despite its simple appearance, ultrasonographic assessment of brachial artery changes, is technically challenging and has a significant learning curve. In the present study, we evaluate the intra and inter-observer variability in assessing peripheral endothelial function with high resolution ultrasound at a tertiary referral center.

[Cardiac stimulations for the treatment of supraventricular arrhythmias].

Unlabelled: Permanent cardiac stimulation in patients with supraventricular tachycardia is used primary for treatment and prevention of atrial fibrillation (AF). Different strategies of stimulation have been design for this purpose. Among the most important are: preferential standard atrial pacing, multisite atrial pacing or septal atrial pacing and pacing algorithms for prevention or treatment.

[Electrophysiologic study and ablation therapy in idiopathic paroxystic atrial fibrillation].

Objective: To analyze the results of radiofrequency catheter ablation (RFCA) of the pulmonary veins (PV) in patients with paroxysmal atrial fibrillation (PAF).

Material And Methods: We describe 4 patients (38 +/- 12 years, interval 8-52; 11 men) with symptomatic PAF, refractory to antiarrhythmic drugs. Special mapping catheters were used and ablation was performed at the ostium/antrum of those veins with abnormal electrical activity (AEA).

[Internal cardioversion in chronic atrial fibrillation].

The importance of atrial fibrillation has always motivated the search of new treatment alternatives. Internal cardioversion has been proposed as a choice in the treatment of atrial fibrillation, giving rise to the development of atrial defibrillator. We present the case of a 68 years old patient without structural heart disease and with diagnosis of chronic atrial fibrillation of 10 months of evolution.