Ventricular ion channels and arrhythmias: an overview of physiology, pathophysiology and pharmacology

Area of Science:

• Cardiology
• Molecular Biology
• Pharmacology

Background:

• Cardiac ion channels are essential transmembrane proteins regulating heart electrophysiology.
• Dysfunctional mutations in these channels are linked to inherited cardiac arrhythmias.
• Ion channels represent key targets for antiarrhythmic therapies.

Purpose of the Study:

• To review the physiology, structure, and function of major cardiac ion channels (Na_V, Ca_V, K_V, K_ir).
• To explore the pathophysiology of inherited arrhythmias caused by ion channel mutations.
• To discuss antiarrhythmic drugs based on their ion channel targets.

Main Methods:

• Literature review of cardiac ion channel physiology and pathophysiology.
• Summary of genetic mutations affecting cardiac ion channel function.
• Classification of antiarrhythmic drugs targeting specific ion channels.

Main Results:

• Detailed overview of ventricular Na_V, Ca_V, K_V, and K_ir channel characteristics and roles.
• Explanation of how ion channel dysfunction leads to arrhythmias.
• Categorization of antiarrhythmic drugs by their ion channel targets.

Conclusions:

• Cardiac ion channels are fundamental to normal heart function and are implicated in arrhythmias.
• Understanding ion channel genetics and pharmacology is vital for treating cardiac arrhythmias.
• This review provides a comprehensive resource on cardiac ion channels and their therapeutic modulation.