Electrocardiography is the process of producing an electrocardiogram, a recording of the heart's electrical activity through repeated cardiac cycles. It is an electrogram of the heart which is a graph of voltage versus time of the electrical activity of the heart using electrodes placed on the skin. These electrodes detect the small electrical changes that are a consequence of cardiac muscle depolarization followed by repolarization during each cardiac cycle (heartbeat). Changes in the normal ECG pattern occur in numerous cardiac abnormalities, including:
Brugada syndrome (BrS) is a genetic disorder in which the electrical activity of the heart is abnormal due to channelopathy. It increases the risk of abnormal heart rhythms and sudden cardiac death. Those affected may have episodes of syncope. The abnormal heart rhythms seen in those with Brugada syndrome often occur at rest. They may be triggered by a fever.
Heart rate is the frequency of the heartbeat measured by the number of contractions of the heart per minute. The heart rate varies according to the body's physical needs, including the need to absorb oxygen and excrete carbon dioxide. It is also modulated by numerous factors, including genetics, physical fitness, stress or psychological status, diet, drugs, hormonal status, environment, and disease/illness, as well as the interaction between these factors. It is usually equal or close to the pulse measured at any peripheral point.
Arrhythmogenic cardiomyopathy (ACM), arrhythmogenic right ventricular dysplasia (ARVD), or arrhythmogenic right ventricular cardiomyopathy (ARVC), most commonly is an inherited heart disease.
A cardiac stress test is a cardiological examination that evaluates the cardiovascular system's response to external stress within a controlled clinical setting. This stress response can be induced through physical exercise or intravenous pharmacological stimulation of heart rate.
The QRS complex is the combination of three of the graphical deflections seen on a typical electrocardiogram. It is usually the central and most visually obvious part of the tracing. It corresponds to the depolarization of the right and left ventricles of the heart and contraction of the large ventricular muscles.
A right bundle branch block (RBBB) is a heart block in the right bundle branch of the electrical conduction system.
Left bundle branch block (LBBB) is a conduction abnormality in the heart that can be seen on an electrocardiogram (ECG). In this condition, activation of the left ventricle of the heart is delayed, which causes the left ventricle to contract later than the right ventricle.
Athletic heart syndrome (AHS) is a non-pathological condition commonly seen in sports medicine in which the human heart is enlarged, and the resting heart rate is lower than normal.
The Bruce protocol is a standardized diagnostic test used in the evaluation of cardiac function and physical fitness, developed by American cardiologist Robert A. Bruce.
ST elevation refers to a finding on an electrocardiogram wherein the trace in the ST segment is abnormally high above the baseline.
Hypertrophic cardiomyopathy screening is an assessment and testing to detect hypertrophic cardiomyopathy (HCM).
The British Journal of Sports Medicine is a twice-monthly peer-reviewed medical journal covering sports science and sports medicine including sport physiotherapy. It is published by the BMJ Group. It was established in 1964 and the editor-in-chief from 2008 to 2020 was Karim M. Khan. Jonathan Drezner has been editor-in-chief since January 1, 2021.
In electrocardiography, left axis deviation (LAD) is a condition wherein the mean electrical axis of ventricular contraction of the heart lies in a frontal plane direction between −30° and −90°. This is reflected by a QRS complex positive in lead I and negative in leads aVF and II.
The Clinical Journal of Sport Medicine (CJSM) is a peer-reviewed medical journal in the sports medicine field. It is published by Lippincott Williams & Wilkins. It was established in 1990 by the Canadian Academy of Sport and Exercise Medicine with Gordon Matheson as the founding editor. It is also the official journal of the Australasian College of Sport and Exercise Physicians, the American Medical Society for Sports Medicine (AMSSM) and American Osteopathic Academy of Sports Medicine. It is the pre-eminent non-surgical sports medicine journal of North America. In North America, sports medicine is a subspecialty field of medicine with an even split between surgical and non-surgical subspecialties. The surgical branch of sports medicine is a subspecialty field of orthopedics, whereas the non-surgical branch draws from specialties including family practice, physiatry, pediatrics, internal medicine and emergency medicine. The journal editor-in-chief is Christopher Hughes. There are active associated CJSM Blog and Podcast sites which are edited by Deputy Editor James MacDonald.
It remains a difficult medical challenge to prevent the sudden cardiac death of athletes, typically defined as natural, unexpected death from cardiac arrest within one hour of the onset of collapse symptoms, excluding additional time on mechanical life support. Most causes relate to congenital or acquired cardiovascular disease with no symptoms noted before the fatal event. The prevalence of any single, associated condition is low, probably less than 0.3% of the population in the athletes' age group, and the sensitivity and specificity of common screening tests leave much to be desired. The single most important predictor is fainting or near-fainting during exercise, which should require detailed explanation and investigation. The victims include many well-known names, especially in professional association football, and close relatives are often at risk for similar cardiac problems.
Frank I. Marcus was an American cardiologist and Emeritus Professor of Medicine at the University of Arizona Health Sciences Center, the author of more than 290 publications in peer-reviewed medical journals and of 90 book chapters. He was considered a world expert on arrhythmogenic right ventricular cardiomyopathy (ARVC) and was a member of the Editorial/Scientific Board of 14 Cardiovascular Journals as well as a reviewer for 26 other medical publications.
Right heart strain is a medical finding of right ventricular dysfunction where the heart muscle of the right ventricle (RV) is deformed. Right heart strain can be caused by pulmonary hypertension, pulmonary embolism, RV infarction, chronic lung disease, pulmonic stenosis, bronchospasm, and pneumothorax.
Sports cardiology is an emerging subspecialty field of Cardiology. It may also be considered a subspecialty field of Sports medicine, or alternatively a hybrid subspecialty that spans cardiology and sports medicine. Emergency medicine is another medical specialty that has some overlap with Sports Cardiology. Sports cardiology is now considered to be a distinct subspecialty in Europe and the USA, with a core curriculum developed in both regions. In Europe it has traditionally been grouped under Preventive Cardiology, but the subspecialty of Sports Cardiology is now considered a distinct field. In the USA, it has developed from being a special interest area to a distinct subspecialty as well.
The American Medical Society for Sports Medicine (AMSSM) is a large sports medicine membership organization, representing over 3000 physicians in the United States, established in 1991. AMSSM includes members who serve as team physicians at the youth level, NCAA, NFL, MLB, NBA, WNBA, MLS, and NHL, as well as with Olympic and Paralympic teams.
