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Related Concept Videos

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...
Cardiac Action Potential01:30

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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.
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Ionic Basis of Cardiac Action Potentials
Correlation between ECG and Cardiac Cycle01:25

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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...
Action Potentials01:41

Action Potentials

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Ventricular electrical activation in cardiac resynchronization as characterized by body surface potential mapping.

Carlos Alberto Pastore1, Nancy Tobias, Nelson Samesima

  • 1Instituto do Coração, Hospital das Clínicas, Faculdade de Medicina, Universidade de São Paulo, São Paulo, SP, Brazil. ecg_pastore@incor.usp.br

Arquivos Brasileiros De Cardiologia
|May 30, 2007
PubMed
Summary

Body surface potential mapping (BSPM) assessed cardiac electrical activation in patients with congestive heart failure (CHF) and left bundle branch block (LBBB). Atriobiventricular pacing (CRT) synchronized ventricular activation, normalizing electrical timing.

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Medical Imaging

Background:

  • Congestive heart failure (CHF) and left bundle branch block (LBBB) significantly impair cardiac electrical activation.
  • Cardiac resynchronization therapy (CRT) with biventricular pacing (BIV-PM) is a key treatment for these patients.
  • Assessing electrical activation patterns is crucial for optimizing CRT outcomes.

Purpose of the Study:

  • To evaluate cardiac electrical activation using body surface potential mapping (BSPM) in patients with CHF and LBBB.
  • To compare electrical activation before and after biventricular pacemaker implantation.
  • To analyze the effects of native LBBB, right ventricular (RV) pacing, and atriobiventricular pacing on ventricular activation.

Main Methods:

  • BSPM was used to analyze mean cardiac electrical activation times (mRV, mAS, mLV) in 28 CHF patients with LBBB.
  • Measurements were taken in three conditions: native LBBB, RV pacing, and atriobiventricular pacing.
  • Results were compared to a control group (CG) of normal individuals.

Main Results:

  • Native LBBB showed delayed left ventricular (LV) activation (mLV) and asynchrony.
  • RV pacing further increased RV activation time (mRV) and LV-RV asynchrony.
  • Atriobiventricular pacing resulted in similar mLV and mRV, approaching normal activation patterns and synchrony.

Conclusions:

  • BSPM demonstrates that atriobiventricular pacing synchronizes ventricular activation in CHF patients with LBBB.
  • This synchronization normalizes electrical timing between RV, LV, and anteroseptal areas.
  • BSPM is a valuable tool for assessing CRT effectiveness in improving cardiac electrical function.