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Related Concept Videos

Pulse rhythm01:30

Pulse rhythm

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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...
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Conduction System of the Heart01:19

Conduction System of the Heart

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Autorhythmicity is a term that refers to the heart's inherent ability to generate electrical signals and instigate muscle contractions. This self-regulating conduction system within the heart consists of two key components: the pacemaker cells and specialized conducting cells.
The pacemaker cells are located in two primary nodes: the sinoatrial (SA) node and the atrioventricular (AV) node. The SA node pacemaker cells can autonomously depolarize, triggering an action potential that leads to the...
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Conduction System of the Heart01:20

Conduction System of the Heart

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The cardiac conduction system produces and transmits electrical impulses that prompt myocardial contraction, ensuring efficient heart function. This intricate system ensures that the heart beats in a coordinated and efficient manner, beginning with the atria and then the ventricles. The conduction system optimizes cardiac output by maintaining this precise sequence, which is crucial for adequate blood circulation.
This system relies on the unique properties of nodal and Purkinje cells:...
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Electrophysiology of Normal Cardiac Rhythm01:19

Electrophysiology of Normal Cardiac Rhythm

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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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The Cardiac Cycle01:13

The Cardiac Cycle

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The heart beats rhythmically in a sequence called the cardiac cycle—a rapid coordination of contraction (systole) and relaxation (diastole).
The Process
Electrical signals—sent from the sinoatrial (SA) node in the right atrial wall to the atrioventricular (AV) node between the right atrium and right ventricle—cause both atria to simultaneously contract. When the signal reaches the AV node, it pauses for approximately a tenth of a second, allowing the atria to contract and...
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Disturbances in Heart Rhythm01:29

Disturbances in Heart Rhythm

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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 heart...
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Tachycardia-Induced Cardiomyopathy As a Chronic Heart Failure Model in Swine
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Tachycardia-Induced Cardiomyopathy As a Chronic Heart Failure Model in Swine

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A Confused Pacemaker.

Bernard Abi-Saleh1, Mohammad ElBaba1, Maurice Khoury1

  • 1Cardiac Electrophysiology Section, Cardiology Division, Department of Internal Medicine, American University of Beirut Medical Center, Beirut, Lebanon.

Cardiac Electrophysiology Clinics
|February 28, 2016
PubMed
Summary
This summary is machine-generated.

Managed Ventricular Pacing (MVP) mode in pacemakers can lead to ventricular lead oversensing and pacing failure. This mode is inappropriate for patients with complete atrioventricular conduction block, as indicated by ECG analysis.

Keywords:
CardiacElectrocardiogramHeartPacemaker

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Area of Science:

  • Cardiology
  • Biomedical Engineering
  • Electrophysiology

Background:

  • Improper pacemaker settings can lead to adverse events.
  • Managed Ventricular Pacing (MVP) is a pacing mode designed to promote intrinsic conduction.
  • Complete atrioventricular conduction block necessitates specific pacing strategies.

Observation:

  • Electrocardiogram (ECG) analysis revealed potential device malfunction.
  • Ventricular lead oversensing was suspected as a cause of pacing failure.
  • The patient's ECG indicated a complete atrioventricular conduction block.

Findings:

  • The pacemaker was configured to Managed Ventricular Pacing (MVP) mode.
  • MVP mode is contraindicated in patients with complete atrioventricular conduction block.
  • This inappropriate setting likely contributed to the observed pacing issues.

Implications:

  • ECG interpretation is crucial for diagnosing pacemaker-related complications.
  • Clinicians must carefully select pacing modes based on patient's conduction status.
  • Incorrect pacemaker mode selection can compromise patient safety and device efficacy.