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Related Concept Videos

Antiarrhythmic Drugs: Class I Agents as Sodium Channel Blockers01:22

Antiarrhythmic Drugs: Class I Agents as Sodium Channel Blockers

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Class I antiarrhythmic drugs are used to treat various types of arrhythmias or irregular heart rhythms. These drugs block the sodium (Na+) channels in the cardiac cells, thereby affecting the movement of electrical impulses across the heart. Class I antiarrhythmic drugs are divided into three subgroups: Class IA, Class IB, and Class IC, each with distinct mechanisms of action and effects on the heart.
Class 1A Antiarrhythmic Drugs: These drugs work by moderately blocking sodium channels,...
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Ion Channels01:19

Ion Channels

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The movement of ions like sodium, potassium, and calcium into and out of the cell is essential to maintain the electrochemical gradient in living cells. The ion channels—a class of membrane transport proteins—help maintain this ionic gradient for the smooth functioning of physiological activities such as maintaining cell size and volume, conducting nerve impulses, and gas and nutrient exchange.
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Antiepileptic Drugs: Potassium Channel Activators01:20

Antiepileptic Drugs: Potassium Channel Activators

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Ezocgabine or retigabine, an antiepileptic drug of remarkable efficacy, has revolutionized the management of seizures. It is a potassium channel activator, explicitly targeting the family of Q subtype potassium channels. It enhances the transmembrane potassium currents, regulating neuronal excitability. This action stabilizes the resting membrane potential, a pivotal factor in mitigating the hyperexcitability that characterizes epilepsy.
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Antiepileptic Drugs: Sodium Channel Blockers01:08

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Antiepileptic drugs are specialized medications that prevent seizures in individuals diagnosed with epilepsy. These drugs primarily function by blocking the movement of sodium ions through channels in the neuronal membrane, inhibiting the repetitive firing of action potentials often associated with seizures.
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Disorders of Acid-Base Balance01:29

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The human body maintains a precise pH range of arterial blood between 7.35 and 7.45. Deviations result in either acidosis (pH < 7.35) or alkalosis (pH > 7.45). These conditions are further classified as respiratory or metabolic disorders based on their underlying cause.
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Ligand-Gated Ion Channel Receptor: Gating Mechanism01:30

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Ligand-gated ion channels are transmembrane proteins that play a vital role in intercellular communication and functions of the nervous system. They allow the influx of ions across the membrane once the neurotransmitter binds, allowing the subsequent transmission of electrical excitation across the neurons. Other ligand-gated ion channels, like the γ-aminobutyric acid (GABA) receptor, permit anions like chloride into the cells on the binding of the GABA molecule. Their entry into the cell...
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Determination of the Relative Cell Surface and Total Expression of Recombinant Ion Channels Using Flow Cytometry
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Ion Channel Diseases: an Update for 2016.

Gordon F Tomaselli1,2, Andreas S Barth3,4

  • 1Division of Cardiology, Johns Hopkins University, 720 N. Rutland Ave. Ross 844, Baltimore, MD, 21205, USA. gtomasel@jhmi.edu.

Current Treatment Options in Cardiovascular Medicine
|February 23, 2016
PubMed
Summary

Inherited cardiac channelopathies cause sudden cardiac death (SCD) in hearts without structural issues. Predicting life-threatening arrhythmias is difficult, but genetics and management strategies are improving.

Keywords:
ArrhythmiaIon channel diseasesSudden cardiac death

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Area of Science:

  • Cardiology
  • Genetics
  • Electrophysiology

Background:

  • Ion channelopathies are inherited electrical heart disorders.
  • They are a common cause of sudden cardiac death (SCD) in individuals with structurally normal hearts.
  • These conditions exhibit variable penetrance and expressivity, complicating risk prediction.

Purpose of the Study:

  • To provide an updated overview of inherited cardiac channelopathies.
  • To discuss the role of genetic testing in diagnosis and management.
  • To focus on common channelopathies associated with increased SCD risk.

Main Methods:

  • Review of current literature on channelopathies.
  • Analysis of genetic testing approaches.
  • Discussion of management strategies for inherited arrhythmias.

Main Results:

  • Genetics play a crucial role in diagnosing and understanding channelopathies.
  • Genetic testing aids in identifying at-risk individuals.
  • Management strategies aim to prevent sudden cardiac death.

Conclusions:

  • Understanding the genetics of channelopathies is key to risk stratification.
  • Genetic testing and tailored management are essential for preventing SCD.
  • Further research is needed to improve prediction and treatment of these disorders.