Artificial Pacemaker – ABC CARDIOL

IJCS

Editorial

Assessment of Quality of Life after Diagnosis of Reflex Syncope: A Subjective Outcome of Great Clinical Importance with Multifactorial Cause

Nágela Nunes et al. Alfredo de Souza Bomfim

Syncope, a clinical syndrome characterized by transient loss of consciousness (TLOC), is defined by specific elements, namely: sudden onset and rapid recovery, loss of postural tone, full recovery of consciousness, amnesia of the event, nonresponsiveness, and a typical event duration of up to 5 minutes (usually lasting seconds). The pathophysiology of syncope involves global cerebral hypoperfusion, primarily due to a drop in blood pressure (BP), with various factors contributing individually or in combination to syncope (). Even brief periods of cessation of cerebral blood flow (6–8 s) or a systolic BP of 50–60 mmHg at the level of the heart (equivalent to 30–45 mmHg at the level of the brain in the upright position) can lead to TLOC. Pathophysiological mechanisms may include a decrease in peripheral vascular resistance, cardiac output, or a decrease in both. The etiology of syncope is didactically classified into three types: 1) orthostatic hypotension (OH); 2) reflex syncope (also termed vasovagal or neurally mediated syncope); and 3) cardiac syncope.

[…]

Ler artigo completo

IJCS

Case Report

First-degree Atrioventricular Block as an Early Marker of Advanced Disease of the Conduction System in a Patient with Hereditary Val142Ile Cardiac Amyloidosis

Nágela S. V. Nunes et al. Evandro Tinoco Mesquita Claudio Tinoco Mesquita Paulo Roberto Benchimol-Barbosa

Introduction

Cardiac amyloidosis (CA) is a type of restrictive cardiomyopathy secondary to amyloid infiltration in the heart. The most common clinical forms are immunoglobulin light chain amyloidosis (AL) and amyloidosis resulting from amyloid deposits secondary to the destabilization of the protein tetramer transthyretin (ATTR), which is divided into two types: the hereditary form (ATTRm) and the wild type (ATTRwt).

Cardiac impulse conduction disorders and atrial arrhythmias are more frequent in ATTR than in the AL form, and this seems to reflect the longer survival of patients affected by ATTR, given that the AL form manifests with high mortality up to 6 months from diagnosis, because conduction system disease appears to be a later manifestation.

[…]

Ler artigo completo

IJCS

Case Report

Pacemaker Implantation without Fluoroscopy and Guided by Anatomical Mapping

Mauricio Montemezzo et al. Ahmed AlTurki Marcos Jakolinski Jose Carlos Moura Jorge

Introduction

Cardiogenic syncope is an uncommon pathology in the context of pregnancy, and an associated transient atrioventricular block is even more rare. The harmful effects of radiation exposure for fetus are already well-known. Thus, alternative guiding techniques are being proposed as an alternative in order to avoid radiation exposure. Previous reports have described the use of intracardiac echocardiography or three-dimensional (3D) electroanatomical mapping. Despite efforts to develop non-fluoroscopic approaches, cardiac device implantation still requires some fluoroscopic imaging. Each hour of fluoroscopic imaging is estimated to increase the lifetime risk of developing a fatal malignancy by up to 1%, as well as being an increased risk of a genetic defect in up to 20 in every 1 million births.^,

With technological advancement, the use of less invasive techniques, together with short procedure times and less radiation exposure is essential. Therefore, repurposing technologies, which were originally developed for other applications, but that have been proven to be safe, should be encouraged. In this light, the present study advocates the use of the CARTO system technology (Biosense Webster, INC., Diamond Bar, CA) to delineate right atrium and right ventricle geometry so as to allow the pacemaker lead to be identified as a catheter to navigate the cardiac cavity without fluoroscopic exposure.

[…]

Ler artigo completo

IJCS

Review Article

Cardiac Arrhythmias and Covid-19

Alexsandro Alves Fagundes et al. Sissy Lara de Melo Luciana Armaganijan Ricardo Kuniyoshi … Luis Gustavo Belo de Moraes Vanessa Alves Guimarães Borges Mauricio Scanavacca Martino Martinelli Filho Ricardo Alkmim Teixeira

Abstract

Cardiovascular manifestations of COVID-19 include cardiac rhythm disturbances, whose mechanisms, incidence, and most common types are not well established in this population. Intense inflammatory response and metabolic activity contribute to recurrence of pre-existing arrhythmias, and other arrhythmias can occur due to myocardial injury, acute coronary insufficiency, and electrolyte disturbances. Brady- and tachyarrhythmias, as well as conduction disorders have been described. QT interval prolongation and fatal ventricular arrhythmias ( Torsades de Pointes ) may result from the pathological process or adverse effect of drugs (antiarrhythmics, chloroquine / hydroxychloroquine, azithromycin and antivirals). Patients with congenital heart disease and hemodynamic repercussions, patients with signs of heart failure, pulmonary hypertension, cyanosis, hypoxemia, and those who underwent heart transplantation and immunosuppression are at greater risk. In patients with implantable cardioverter-defibrillators (ICDs), the risk depends on the presence of structural heart disease. In the course of COVID-19, in-person assessment of these patients should be limited to high-risk situations, including syncope, worsening of heart failure and shock delivery by ICDs. Likewise, cardiac implantable electronic device implantation or replacement surgery should be limited to emergency and urgent cases, including symptomatic high-degree atrioventricular block, ICD for secondary prevention and pulse generator replacement due to battery drain.

Ler artigo completo

Assessment of Quality of Life after Diagnosis of Reflex Syncope: A Subjective Outcome of Great Clinical Importance with Multifactorial Cause

First-degree Atrioventricular Block as an Early Marker of Advanced Disease of the Conduction System in a Patient with Hereditary Val142Ile Cardiac Amyloidosis

Introduction

Pacemaker Implantation without Fluoroscopy and Guided by Anatomical Mapping

Introduction

Cardiac Arrhythmias and Covid-19

Abstract

Formato de Documento Eletrônico (Vancouver)

Formato de Documento Eletrônico (ABNT)

Formato de Documento Eletrônico (APA)

Formato de Documento Eletrônico (ISO)

Formato de Documento Eletrônico (Vancouver)

Formato de Documento Eletrônico (ABNT)

Formato de Documento Eletrônico (APA)

Formato de Documento Eletrônico (ISO)

Formato de Documento Eletrônico (Vancouver)

Formato de Documento Eletrônico (ABNT)

Formato de Documento Eletrônico (APA)

Formato de Documento Eletrônico (ISO)

Formato de Documento Eletrônico (Vancouver)

Formato de Documento Eletrônico (ABNT)

Formato de Documento Eletrônico (APA)

Formato de Documento Eletrônico (ISO)