Related Experiment Video

Updated: May 5, 2026

Recapitulation of an Ion Channel IV Curve Using Frequency Components
10:14

Recapitulation of an Ion Channel IV Curve Using Frequency Components

Published on: February 9, 2011

15.6K

Mechanisms and control of repolarization

E Carmeliet1

  • 1University of Leuven, Belgium.

European Heart Journal
|November 1, 1993
PubMed

Insights

This study explores drug interventions to prolong the cardiac action potential by modulating ion channel currents. It details how altering sodium (Na+), calcium (Ca2+), potassium (K+), and chloride (Cl-) channels impacts action potential duration.

Area of Science:

  • Pharmacology
  • Cardiovascular Physiology
  • Ion Channel Biophysics

Background:

  • The cardiac action potential duration (APD) is a critical determinant of cardiac function and arrhythmogenesis.
  • Modulation of ion channel activity is a key target for therapeutic interventions in cardiovascular diseases.

Purpose of the Study:

  • To review and discuss interventions, particularly drug-induced, that prolong the action potential.
  • To provide a detailed analysis of the effects of these interventions on specific ion channel currents.

Main Methods:

  • Review of existing literature on action potential prolongation.
  • Analysis of studies investigating the modulation of inward and outward ion currents.
  • Focus on the effects on sodium (Na+), calcium (Ca2+), potassium (K+), and chloride (Cl-) channels.

Main Results:

  • Interventions targeting specific ion channels can effectively prolong the action potential.
  • Drug-induced modulation of Na+, Ca2+, K+, and Cl- currents significantly impacts APD.
  • Detailed understanding of current components is crucial for predicting APD changes.

Conclusions:

  • Drug-based modulation of ion channels offers a viable strategy for prolonging the action potential.
  • Precise targeting of ion channel subtypes is essential for therapeutic efficacy and safety.
  • Further research into the intricate regulation of ion channels can lead to novel cardiovascular therapies.

More Related Videos

Electromechanical Assessment of Optogenetically Modulated Cardiomyocyte Activity12:52

Electromechanical Assessment of Optogenetically Modulated Cardiomyocyte Activity

Published on: March 5, 2020

9.8K
Voltage-Dependent Potassium Current Recording on H9c2 Cardiomyocytes via the Whole-Cell Patch-Clamp Technique08:11

Voltage-Dependent Potassium Current Recording on H9c2 Cardiomyocytes via the Whole-Cell Patch-Clamp Technique

Published on: November 11, 2022

3.1K

Related Concept Videos

The Role of Ion Channels in Neuronal Computation01:19

The Role of Ion Channels in Neuronal Computation

A postsynaptic neuron usually receives numerous impulses from several other presynaptic neurons. The axon hillock of the postsynaptic neuron integrates all these signals and determines the likelihood of firing an action potential.
Sometimes a single EPSP is strong enough to induce an action potential in the postsynaptic neuron. However, multiple presynaptic inputs must often create EPSPs around the same time for the postsynaptic neuron to be sufficiently depolarized to fire an action potential....
3.2K
Depolarizing Blockers: Mechanism of Action01:28

Depolarizing Blockers: Mechanism of Action

Depolarizing blockers act on skeletal muscle fibers' membranes and induce their depolarization. Most depolarizing blockers have two quaternary N+ atoms that bind the nicotinic acetylcholine receptors and cause neuromuscular blockade within minutes.
Succinylcholine is the most commonly used depolarizing blocker. Chemically, it constitutes two molecules of acetylcholine joined together by an acetate methyl group. They act on the receptors in the same way as acetylcholine. Because...
3.4K
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...
20.7K
Propagation of Action Potentials01:23

Propagation of Action Potentials

The propagation of an action potential refers to the process by which a nerve impulse, or "action potential," travels along a neuron.
Neurons (nerve cells) have a resting membrane potential, with a slightly negative charge inside compared to outside. This is maintained by ion channels, such as sodium (Na+) and potassium (K+) channels, which control the flow of ions. When a stimulus, like a touch or a signal from another neuron, triggers the neuron, sodium channels open, allowing sodium ions to...
15.5K
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...
7.8K
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
11.9K