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Related Concept Videos

Action Potential01:14

Action Potential

Neurons communicate by firing action potentials—the electrochemical signal that is propagated along the axon. The signal results in the release of neurotransmitters at axon terminals, thereby transmitting information to the nervous system. An action potential is a specific "all-or-none" change in membrane potential that results in a rapid spike in voltage.
Membrane potential in neurons
Neurons typically have a resting membrane potential of about -70 millivolts (mV). When they receive...
Action Potential: Phases of Stimulation01:28

Action Potential: Phases of Stimulation

The action potential is a complex electrical event that occurs in excitable cells, such as neurons and muscle cells. It consists of several distinct phases, each with specific characteristics.
Resting Phase:
In this phase, the cell's membrane is at its resting potential, typically around -70 millivolts (mV) for neurons. Inside the cell, there is a higher concentration of potassium ions (K+) and a lower concentration of sodium ions (Na+). Voltage-gated sodium channels are closed, and...
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
Action Potentials01:41

Action Potentials

Overview

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Related Experiment Video

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Monophasic action potential recordings in humans.

Hans J Moore1, Michael R Franz

  • 1Veterans Affairs Medical Center, Washington, DC 20422, USA.

Journal of Cardiovascular Electrophysiology
|February 9, 2007
PubMed
Summary

Monophasic action potential (MAP) recordings bridge basic and clinical electrophysiology. MAPs offer detailed local repolarization insights, aiding diagnosis of ventricular and atrial arrhythmias where electrocardiograms fall short.

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Area of Science:

  • Electrophysiology
  • Cardiology
  • Biomedical Engineering

Background:

  • The electrocardiogram (ECG) detects abnormal repolarization but lacks local detail.
  • Monophasic action potential (MAP) recordings provide insights into local transmembrane potentials.
  • Bridging basic science and clinical practice in electrophysiology is crucial.

Purpose of the Study:

  • To explain the fundamental principles of monophasic action potential recording.
  • To highlight the clinical applications of MAP recordings in cardiac arrhythmias.
  • To demonstrate the utility of MAPs in understanding local electrophysiological events.

Main Methods:

  • Utilizing specialized catheters for direct recording of cardiac electrical activity.
  • Analyzing MAP waveforms to assess local repolarization characteristics.
  • Correlating MAP data with clinical findings in patients with arrhythmias.

Main Results:

  • MAP recordings offer a detailed view of local repolarization, surpassing ECG capabilities.
  • MAP waveforms directly reflect transmembrane action potentials.
  • Clinical utility demonstrated in both ventricular and atrial arrhythmias.

Conclusions:

  • MAP recordings are a valuable tool for understanding local cardiac electrophysiology.
  • MAPs enhance the diagnosis and management of complex arrhythmias.
  • MAP technology facilitates a deeper connection between basic electrophysiological research and clinical cardiology.