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Related Concept Videos

Electrocardiogram01:29

Electrocardiogram

4.9K
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...
4.9K
ECG Interpretation of Rhythms01:24

ECG Interpretation of Rhythms

10.0K
An electrocardiogram (ECG)graphically represents the heart's electrical activity on ECG paper or a monitor.
Components of the Electrocardiogram
The primary components of a normal ECG waveform in Normal sinus rhythm(NSR) include the P wave, PR interval, QRS complex, ST segment, T wave, and occasionally a U wave.
ECG waveforms are divided by vertical and horizontal lines at standard intervals.
The horizontal axis measures time and rate, and the vertical axis measures amplitude or voltage....
10.0K
Electrocardiogram Fundamentals01:28

Electrocardiogram Fundamentals

1.2K
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.
Parts of an ECG
An ECG utilizes electrodes on the skin...
1.2K
ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias01:25

ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias

294
Arrhythmia is a condition characterized by an irregular heart rhythm, with ECG changes that differ based on its origin and nature. The types of arrhythmias discussed below include atrial, junctional, and ventricular arrhythmias.Atrial ArrhythmiasPremature Atrial Complexes (PACs): PACs are early atrial beats caused by stress, caffeine, alcohol, electrolyte imbalances, hypoxia, hyperthyroidism, or certain medications (e.g., bronchodilators and decongestants). The ECG shows early P waves with an...
294
Correlation between ECG and Cardiac Cycle01:25

Correlation between ECG and Cardiac Cycle

10.9K
The electrical signals recorded on an electrocardiogram (ECG) occur before the mechanical processes of contraction and relaxation during the cardiac cycle.
A cardiac action potential originates in the SA node and spreads throughout the atria and the AV node in approximately 0.03 seconds. This results in the P wave in an ECG and triggers atrial contraction. The action potential is then briefly slowed at the AV node, allowing the atria to contract and fill the ventricles with blood before...
10.9K
ECG Interpretation of Arrhythmias I: Sinus Arrhythmias01:16

ECG Interpretation of Arrhythmias I: Sinus Arrhythmias

598
Arrhythmias are disturbances in the heart's rhythm that lead to abnormal heartbeats. These irregularities can originate from different parts of the heart and are classified based on their origin and nature.
Types of Arrhythmias
Sinus Node Arrhythmias
Sinus Bradycardia: Originating from the sinoatrial (SA) node, sinus bradycardia involves slower impulses, resulting in a heart rate of less than 60 beats per minute (bpm). Causes include sleep, vagal stimulation, beta-blockers, hypothyroidism,...
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Real-Time Electrocardiogram Monitoring During Treadmill Training in Mice
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Electrocardiographic interpretation in athletes.

Mark Abela1,2,3, Sanjay Sharma4

  • 1Department of Cardiology, Mater Dei Hospital, Msida, Malta - markabela88@gmail.com.

Minerva Cardiology and Angiology
|October 16, 2020
PubMed
Summary

Intensive exercise can trigger sudden cardiac arrest in susceptible athletes. Electrocardiography (ECG) screening helps identify at-risk individuals by differentiating normal athlete heart changes from serious cardiac conditions.

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Area of Science:

  • Cardiology
  • Sports Medicine
  • Exercise Physiology

Background:

  • Regular moderate exercise offers cardiovascular benefits, but intense exercise can paradoxically lead to sudden cardiac arrest in individuals with underlying heart conditions.
  • Sudden cardiac arrest in athletes, though rare, can be devastating, particularly in young individuals, necessitating risk identification strategies.

Purpose of the Study:

  • To review the normal electrocardiographic (ECG) patterns of the "athlete's heart."
  • To provide insights into differentiating physiological ECG changes from those indicative of serious cardiac disease in athletes.

Main Methods:

  • Review of literature on exercise-induced cardiac events and ECG findings in athletes.
  • Analysis of physiological adaptations in the athlete's heart and their ECG manifestations.
  • Comparison of normal ECG patterns with those of pathological cardiac conditions.

Main Results:

  • Intensive exercise can precipitate cardiac arrest through mechanisms like catecholamine surges and myocardial ischemia.
  • Electrocardiography (ECG) is a cost-effective screening tool for detecting electrical and structural heart abnormalities in athletes.
  • Physiological ECG changes in athletes (e.g., sinus bradycardia, J-point elevation) can overlap with pathological patterns, complicating interpretation.

Conclusions:

  • Differentiating normal physiological ECG variations in athletes from signs of serious cardiac disease is crucial for accurate risk assessment.
  • ECG screening, when interpreted carefully considering factors like age, sex, and ethnicity, can aid in identifying athletes at risk of sudden cardiac arrest.