Related Experiment Video
Updated: Jun 11, 2026
10:12
Enrichment of Mammalian Tissues and Xenopus Oocytes with Cholesterol
Published on: March 25, 2020
Cholesterol and cardiac arrhythmias
Charitha L Goonasekara1, Elise Balse, Stephan Hatem
1Department of Anesthesiology, Pharmacology and Therapeutics, University of British Columbia, 2350 Health Sciences Mall, Vancouver, BC, V6T 1Z3, Canada.
Expert Review of Cardiovascular Therapy
|July 7, 2010
Summary
High cholesterol contributes to cardiac arrhythmias like atrial fibrillation and ventricular arrhythmias. Cholesterol-lowering statin drugs may effectively treat these heart rhythm disorders by improving membrane function.
Area of Science:
- Cardiology
- Biochemistry
- Pharmacology
Background:
- Cardiac arrhythmias, including ventricular arrhythmias and atrial fibrillation, are significant causes of death and stroke.
- High cholesterol levels are increasingly linked to the development of cardiac arrhythmias.
- Cholesterol affects cardiac membrane properties, influencing ion channels, pumps, and hormone receptors.
Purpose of the Study:
- To explore the role of cholesterol in cardiac arrhythmias.
- To investigate the potential of cholesterol-lowering therapies for treating heart rhythm disorders.
Main Methods:
- Review of recent evidence linking cholesterol to cardiac arrhythmias.
- Analysis of cholesterol's effects on membrane proteins, fluidity, and lipid rafts.
- Examination of statins' protective effects against arrhythmias.
Main Results:
- High cholesterol alters membrane properties, impacting cardiac function.
- Statins demonstrate protective effects against ventricular arrhythmias and atrial fibrillation.
- Cholesterol reduction is a potential therapeutic strategy for arrhythmias.
Conclusions:
- Cholesterol plays a role in the pathogenesis of cardiac arrhythmias.
- Cholesterol-lowering therapy, particularly with statins, may offer a treatment avenue for cardiac arrhythmias.
- Further research into the mechanisms of cholesterol's impact on cardiac electrophysiology is warranted.
Related Concept Videos
01:28Mechanism of Cardiac Arrhythmias
Arrhythmias are irregular heart rhythms occurring when the heart's electrical impulses become abnormal. These disturbances can lead to various symptoms, depending on their severity and the underlying cause. Some common factors contributing to arrhythmias include hypoxia, ischemia, electrolyte imbalances, excessive catecholamine exposure, drug toxicity, and muscle overstretching. Arrhythmias can be classified into two main types based on the rate and site of origin of abnormal heart rhythms.
01:29Disturbances in Heart Rhythm
Arrhythmia or dysrhythmia refers to an abnormal heart rhythm caused by a defect in the heart's conduction system. It can cause the heart to beat irregularly, too quickly, or too slowly, leading to symptoms like chest pain, shortness of breath, and fainting. Factors such as stress, caffeine, alcohol, nicotine, cocaine, certain drugs, congenital defects, diseases, and electrolyte abnormalities can trigger arrhythmias.
Arrhythmias are categorized by their speed, rhythm, and origin. A slow heart...
Arrhythmias are categorized by their speed, rhythm, and origin. A slow heart...
01:29Cholesterol: Significance and Regulation
Although not a source of energy, cholesterol plays a significant role as a foundational structure for bile salts, steroid hormones, and vitamin D, as well as being a crucial component of plasma membranes. Approximately 15% of blood cholesterol is derived from our diet, with the remainder synthesized from acetyl CoA by the liver and intestines. Cholesterol is eliminated from the body through its conversion into bile salts, which are eventually discarded in the feces.
Considering cholesterol and...
Considering cholesterol and...
01:22Antiarrhythmic Drugs: Class I Agents as Sodium Channel Blockers
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,...
Class 1A Antiarrhythmic Drugs: These drugs work by moderately blocking sodium channels,...
01:24Antiarrhythmic Drugs: Class II Agents as β-Adrenergic Blockers
Adrenergic stimulation generally impacts cardiac rate and rhythm. Specifically, stimulation of the β-adrenoceptors triggers an increase in intracellular calcium ion influx and pacemaker currents, which may cause arrhythmias. Catecholamines like adrenaline also demonstrate β2-adrenoceptor-mediated hypokalemia, impacting cardiac action potential and disrupting the normal cardiac rhythm. Class II antiarrhythmic drugs are β-adrenoceptor antagonists or β-blockers, which indirectly block calcium...
01:20Antiarrhythmic Drugs: Class IV Agents as Calcium Channel Blockers
Class IV antiarrhythmic drugs, such as verapamil and diltiazem, block calcium channels. They primarily affect the heart, slowing the conduction in calcium-dependent tissues like the SA and AV nodes. These drugs manage reentrant supraventricular tachycardia (SVT) and reduce ventricular rate in atrial flutter/fibrillation.
Verapamil, a calcium channel blocker, inhibits calcium movement across myocardial cell membranes and vascular smooth muscle. This results in the dilation of coronary and...
Verapamil, a calcium channel blocker, inhibits calcium movement across myocardial cell membranes and vascular smooth muscle. This results in the dilation of coronary and...