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Related Concept Videos

Electrocardiogram01:29

Electrocardiogram

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An electrocardiogram (ECG or EKG) is a critical diagnostic tool that records the electrical signals produced by the heart during each heartbeat. This recording is achieved through electrodes placed strategically on the arms, legs, and chest. The electrocardiograph amplifies these signals and produces 12 distinct tracings, offering a comprehensive understanding of the heart's electrical activity.
Three major waveforms are present in a typical ECG recording: the P wave, the QRS complex, and...
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Dysrhythmias III: Characteristics of Dysrhythmias01:29

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Dysrhythmias, also known as arrhythmias, are irregular heart rhythms that result from abnormal electrical activity in the heart, affecting its ability to circulate blood efficiently. Tachyarrhythmias, a subset of dysrhythmias, are characterized by abnormally fast heart rates exceeding 100 beats per minute. Here are some types of tachyarrhythmias with their distinct ECG features:Sinus Tachycardia:Sinus tachycardia presents a regular heart rhythm with an increased rate of 101-180 beats per...
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Electrocardiogram Fundamentals01:28

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Introduction
An electrocardiogram (ECG) is a diagnostic tool for identifying cardiac conditions such as arrhythmias, conduction abnormalities, and myocardial ischemia.
Definition
An electrocardiogram (ECG) visualizes the heart's electrical activity by tracing the electrical movement associated with each heartbeat on a graph or monitor. As the heart beats, an electrical wave passes through it, correlating with the cardiac cycle events.
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Related Experiment Video

Updated: Mar 6, 2026

Autonomic Function Following Concussion in Youth Athletes: An Exploration of Heart Rate Variability Using 24-hour Recording Methodology
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[Microvolt T-Wave Alternans in Adolescent Elite Athletes].

V V Komolyatova1, L M Makarov1, N N Fedina1

  • 1Center for Syncope and Arrhythmias in Children and Adolescents of Federal Medico-Biology Agency of Russia, Moskvorechie str. 20, 115409 Moscow, Russia.

Kardiologiia
|March 16, 2017
PubMed
Summary

Microvolt T-wave alternans (MTA) provides insights into heart electrical stability. This study determined normal MTA ranges during exercise tests in young elite athletes, crucial for understanding cardiac health in this population.

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Area of Science:

  • Cardiology
  • Sports Medicine
  • Electrophysiology

Context:

  • Microvolt T-wave alternans (MTA) is a recognized indicator of myocardial electrical instability.
  • Assessing cardiac electrical properties in athletes is vital for performance and health monitoring.

Purpose:

  • To establish the normal range of MTA parameters during bicycle exercise testing (ET) in adolescent elite athletes.
  • To provide reference values for MTA in a young, high-performing athletic cohort.

Summary:

  • The study analyzed MTA parameters in 500 adolescent elite athletes (ages 9-18) using bicycle ET.
  • ECG registration was performed in clinical and orthostatic positions with automated analysis during exercise.
  • Data were collected from athletes across 27 different sports.

Impact:

  • Establishes normative MTA values for adolescent elite athletes during exercise.
  • Aids in the interpretation of MTA results for cardiac risk assessment in young athletes.
  • Contributes to the understanding of cardiac electrical behavior under physiological stress in elite youth sports.