INTRODUCTION Mitral valve prolapse syndrome (MVP) is the most common valvular abnormalityin the young and is correlated with increased frequency of cardiac dysrhythmias and sudden death.The aim of this study was to compare frequency of "early repolarization" in electrocardiogram(ECG) between MVP patients and healthy adults. METHODS In this cross-sectional study, we compared ECG presentations ...

As "time is myocardium" in the settings of acute myocardial infarction, it is important to make the diagnosis as quickly as possible, and a high clinical suspicion is needed to avoid missing the diagnosis, resulting in unwarranted interventions. The electrocardiogram is a crucial tool in the identification of acute chest pain, enabling a detailed analysis of patterns of ST-segment elevation. We...

Since its description in 1992, Brugada Syndrome has become the second cause of death among young adults in some countries1. The Brugada syndrome is an autosomal dominant disease with incomplete penetrance, which may cause syncope and sudden cardiac death in young individuals with a normal heart. It is characterized by an electrocardiographic (ECG) pattern of complete or incomplete right bundle ...

A young woman with spontaneous left pneumothorax had a phasic voltage alternation of her electrocardiogram that resolved with expansion of the lung. Likely explanations for this phenomenon are a respiratory dependent change in cardiac anatomy and a change in the volume conductor with respiration.

Numerous papers have been published in the past few years describing the changes in the electro-cardiogram of animals submitted to hypothermia (Prec et al. and the pattern is now fairly well established. Information regarding changes in the human cardiogram, however, is scanty and has been derived from various sources. Electrocardiograms of patients suffering from severe exposure to cold have b...

We made continuous electrocardiographic recordings on magnetic tape during 15 episodes of ischemia in five patients with variant angina to determine the characteristics of the QRS changes. Orthogonal leads were used and the electrocardiograms were analyzed visually and by digital computer. Changes were quantified by subtracting baseline electrocardiograms from those obtained during ischemia. La...