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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...
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...
Cardiac Action Potential01:30

Cardiac Action Potential

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
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...
Bode Plots Construction01:24

Bode Plots Construction

The Bode plot is an essential tool in control system analysis, mapping the frequency response of a system through a magnitude plot and a phase plot, both against a logarithmic frequency axis. To construct a Bode plot, consider the transfer function H(ω):

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Related Experiment Video

Updated: Jul 14, 2026

Assessing Rat Diaphragm Motor Unit Connectivity Outcome Measures as Quantitative Biomarkers of Phrenic Motor Neuron Degeneration and Compensation
06:08

Assessing Rat Diaphragm Motor Unit Connectivity Outcome Measures as Quantitative Biomarkers of Phrenic Motor Neuron Degeneration and Compensation

Published on: April 19, 2024

Visualizing pacemaker-induced phrenic nerve stimulation with acoustic cardiography.

Stefan Toggweiler1, Richard Kobza, Markus Roos

  • 1Division of Cardiology, Kantonsspital Luzern, Lucerne, Switzerland.

Pacing and Clinical Electrophysiology : PACE
|June 6, 2007
PubMed
Summary

Acoustic cardiography is a simple, non-invasive test useful in any diagnostic setting. It can also monitor biventricular pacemaker implantation to prevent phrenic nerve stimulation.

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Last Updated: Jul 14, 2026

Assessing Rat Diaphragm Motor Unit Connectivity Outcome Measures as Quantitative Biomarkers of Phrenic Motor Neuron Degeneration and Compensation
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Area of Science:

  • Cardiology
  • Biomedical Engineering

Background:

  • Biventricular pacemakers are crucial for managing heart failure.
  • Phrenic nerve stimulation is a potential complication during pacemaker implantation.
  • Accurate monitoring is essential to optimize pacemaker function and patient safety.

Observation:

  • Acoustic cardiography (ACG) was evaluated as a monitoring tool.
  • The study assessed ACG's applicability in diverse diagnostic scenarios.
  • ACG's utility during biventricular pacemaker implantation was specifically examined.

Findings:

  • Acoustic cardiography is a versatile, non-invasive diagnostic tool.
  • ACG effectively identified pacemaker settings that could cause phrenic nerve stimulation.
  • The test can be seamlessly integrated into pacemaker implantation procedures.

Implications:

  • ACG offers a simple method for ensuring pacemaker safety and efficacy.
  • This technique enhances patient care by preventing adverse events.
  • Wider adoption of ACG in cardiology can improve procedural outcomes.