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Related Concept Videos

Electrocardiogram01:29

Electrocardiogram

1.7K
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...
1.7K
Cardiac Action Potential01:30

Cardiac Action Potential

663
Cardiac action potentials are essential for proper heart function, enabling the rhythmic contractions needed for adequate blood circulation. Nodal cells and Purkinje fibers, specialized for electrical conduction, generate these action potentials.
The cardiac action potential process involves a series of phases characterized by the movement of ions across the cardiac cell membranes, leading to the depolarization and repolarization of the cardiac myocytes.
Ionic Basis of Cardiac Action Potentials
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ECG Interpretation of Rhythms01:24

ECG Interpretation of Rhythms

325
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....
325
Electrophysiology of Normal Cardiac Rhythm01:19

Electrophysiology of Normal Cardiac Rhythm

1.8K
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...
1.8K
Disturbances in Heart Rhythm01:28

Disturbances in Heart Rhythm

737
Arrhythmia or dysrhythmia refers to an abnormal heart rhythm caused by a defect in the heart's conduction system. It can cause the heart to beat irregularly, too quickly, or too slowly, leading to symptoms like chest pain, shortness of breath, and fainting. Factors such as stress, caffeine, alcohol, nicotine, cocaine, certain drugs, congenital defects, diseases, and electrolyte abnormalities can trigger arrhythmias.
Arrhythmias are categorized by their speed, rhythm, and origin. A slow...
737
Electrocardiogram Fundamentals01:28

Electrocardiogram Fundamentals

457
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...
457

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Decoding the Pacing Spikes: An Electrocardiographis Challenge.

Avinash Jeewooth1, Atul Kaushik2, Aparna Jaswal1

  • 1Department of Electrophysiology, Fortis Escorts Heart Institute (FEHI), New Delhi, India.

JACC. Case Reports
|April 4, 2025
PubMed
Summary
This summary is machine-generated.

This study details a 50-year-old woman

Keywords:
cardiac pacemakerelectrocardiogramelectrophysiology

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Area of Science:

  • Cardiology
  • Electrophysiology

Background:

  • Complete heart block presents a significant risk for symptomatic bradycardia.
  • Pacemaker implantation is a standard treatment for symptomatic atrioventricular block.

Purpose of the Study:

  • To present a case of symptomatic complete heart block.
  • To discuss the diagnostic approach, including electrocardiogram interpretation.
  • To highlight the management with dual-chamber pacemaker implantation.

Main Methods:

  • Case report of a 50-year-old female patient.
  • Electrocardiogram (ECG) analysis for diagnosis of complete heart block.
  • Surgical implantation of a dual-chamber pacemaker.

Main Results:

  • Successful implantation of a dual-chamber pacemaker.
  • Resolution of symptoms associated with complete heart block.
  • Demonstration of effective pacing on post-operative ECG.

Conclusions:

  • Dual-chamber pacemaker implantation is effective for symptomatic complete heart block.
  • Thorough electrocardiogram interpretation is crucial for diagnosis and management.
  • Understanding the underlying mechanisms aids in patient care.