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Related Concept Videos

Electrocardiogram Fundamentals01:28

Electrocardiogram Fundamentals

2.1K
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...
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Electrocardiogram01:29

Electrocardiogram

10.1K
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...
10.1K
Pulse rhythm01:30

Pulse rhythm

1.7K
Pulse rhythm refers to the pattern of pulsations within specific intervals, offering valuable insights into the regularity or irregularity of the heart's beats as observed through the pattern of pulsation within specific intervals. A regular pulse exhibits a consistent heart rate with uniform waveforms and pulsation force, variations of which can be classified as normal, weak, or bounding.
Conversely, an irregular pulse pattern is termed dysrhythmia, stemming from disruptions in cardiac...
1.7K
ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias01:25

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

1.1K
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...
1.1K
Correlation between ECG and Cardiac Cycle01:25

Correlation between ECG and Cardiac Cycle

17.1K
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...
17.1K
Electrophysiology of Normal Cardiac Rhythm01:19

Electrophysiology of Normal Cardiac Rhythm

10.6K
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...
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Related Experiment Video

Updated: Apr 19, 2026

Patient Directed Recording of a Bipolar Three-Lead Electrocardiogram using a Smartwatch with ECG Function
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Patient Directed Recording of a Bipolar Three-Lead Electrocardiogram using a Smartwatch with ECG Function

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Computed bipolar precordial leads for improved P wave detection.

Velislav N Batchvarov1, Elijah R Behr1

  • 1Cardiovascular and Cell Sciences Research Institute, St. George's University of London, London, United Kingdom.

Journal of Electrocardiology
|December 25, 2014
PubMed
Summary

This study shows computed ECG leads can reveal hidden P waves for better rhythm analysis in noisy Holter recordings. This improves diagnosis for conditions like Brugada syndrome.

Keywords:
Computed bipolar leadsElectrocardiographyP waveUnipolar leadsprecordial leads

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A Research Method For Detecting Transient Myocardial Ischemia In Patients With Suspected Acute Coronary Syndrome Using Continuous ST-segment Analysis
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A Research Method For Detecting Transient Myocardial Ischemia In Patients With Suspected Acute Coronary Syndrome Using Continuous ST-segment Analysis
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Area of Science:

  • Cardiology
  • Biomedical Engineering
  • Signal Processing

Background:

  • Brugada syndrome diagnosis requires accurate electrocardiogram (ECG) interpretation.
  • Holter monitoring provides continuous ECG data but can be affected by noise and signal overlap.
  • Identifying P waves is crucial for assessing cardiac rhythm and conduction.

Observation:

  • A 24-hour Holter recording from an 85-year-old man with suspected Brugada syndrome exhibited significant noise.
  • Standard 12-lead ECG analysis was hindered by indiscernible P waves due to signal merging and noise.
  • Computed bipolar precordial leads derived from unipolar leads significantly reduced noise.

Findings:

  • P waves, obscured in standard leads, became clearly visible in the computed bipolar precordial leads.
  • The computed leads facilitated accurate rhythm analysis despite the challenging recording quality.
  • This demonstrates the utility of derived ECG leads in overcoming signal degradation.

Implications:

  • Computed ECG leads offer a valuable tool for improving rhythm analysis in challenging Holter recordings.
  • This technique can enhance diagnostic accuracy for arrhythmias and conduction abnormalities.
  • Further research into computed leads may optimize ECG interpretation in various clinical scenarios.