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Related Concept Videos

Electrocardiogram01:29

Electrocardiogram

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 the T...
Electrocardiogram Fundamentals01:28

Electrocardiogram Fundamentals

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 to...
Electrophysiology of Normal Cardiac Rhythm01:19

Electrophysiology of Normal Cardiac Rhythm

The normal cardiac rhythm is a synchronized electrical activity that facilitates the regular and coordinated contraction of the heart muscle. This process is essential for efficient blood circulation throughout the body. The fundamental elements involved in establishing and maintaining this rhythm include the unique electrical properties of cardiac muscle cells, the sinoatrial (SA) node's pacemaker function, the specialized conducting system, and the ionic mechanisms underlying each phase of...
Correlation between ECG and Cardiac Cycle01:25

Correlation between ECG and Cardiac Cycle

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...
Instrumentation Amplifier01:25

Instrumentation Amplifier

An electrocardiography (ECG) machine is an essential piece of medical equipment used to monitor the electrical activity of the heart. It operates by detecting small electrical changes on the skin that result from the depolarization of the heart muscle during each heartbeat. However, these signals are in the microvolt range and can be easily overwhelmed by noise or interference.
To overcome this challenge, an ECG machine utilizes an instrumentation amplifier. This specialized amplifier is...
Mechanism of Cardiac Arrhythmias01:28

Mechanism of Cardiac Arrhythmias

Arrhythmias are irregular heart rhythms occurring when the heart's electrical impulses become abnormal. These disturbances can lead to various symptoms, depending on their severity and the underlying cause. Some common factors contributing to arrhythmias include hypoxia, ischemia, electrolyte imbalances, excessive catecholamine exposure, drug toxicity, and muscle overstretching. Arrhythmias can be classified into two main types based on the rate and site of origin of abnormal heart rhythms.

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Related Experiment Video

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Real-Time Cardiac Mapping with a Noninvasive Imageless Electrocardiographic Imaging System
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Published on: April 11, 2025

Electromechanical association: a subtle electrocardiogram artifact.

Emre Aslanger1, Kivanc Yalin

  • 1Istanbul Faculty of Medicine, Cardiology Department, Istanbul University, Millet Bv, Capa-Istanbul, Turkey. mr_aslanger@hotmail.com

Journal of Electrocardiology
|March 1, 2011
PubMed
Summary

Unusual electrocardiogram (ECG) artifacts from radial artery impulses can mimic abnormal T waves. This subtle, dangerous artifact can deceive even experienced clinicians, requiring careful differentiation from actual cardiac conditions.

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Area of Science:

  • Cardiology
  • Biomedical Engineering
  • Medical Imaging

Background:

  • Electrocardiogram (ECG) artifacts can mimic serious cardiac disorders.
  • While most artifacts are recognizable, some subtle patterns can deceive experienced clinicians.
  • Previous reports identified radial arterial impulse as a cause of unusual ECG artifacts.

Observation:

  • This study presents three additional cases of ECG artifacts caused by radial arterial impulse.
  • The artifact closely imitates an abnormal T wave morphology on the ECG.
  • Caught-in-the-act evidence demonstrates the dynamic relationship between arterial pulse and the artifact.

Findings:

  • Radial arterial impulse is a significant, often overlooked source of ECG artifact.
  • The artifactual T wave changes can be mistaken for genuine myocardial abnormalities.
  • High-fidelity monitoring or simultaneous pulse palpation can aid in identification.

Implications:

  • Accurate identification of this artifact is crucial to avoid misdiagnosis of cardiac conditions.
  • Awareness among clinicians can prevent unnecessary investigations and treatments.
  • Further research into artifact detection algorithms may improve ECG interpretation accuracy.