Related Experiment Video
Updated: Jul 5, 2025
09:36
Dual-Dye Optical Mapping of Hearts from RyR2R2474S Knock-In Mice of Catecholaminergic Polymorphic Ventricular Tachycardia
Published on: December 22, 2023
1.2K
Arrhythmogenic Cardiomyopathy: Definition, Classification and Arrhythmic Risk Stratification
Marisa Varrenti1, Alberto Preda1, Antonio Frontera1
1Electrophysiology Unit, De Gasperis Cardio Center, Niguarda Hospital, 20162 Milan, Italy.
Journal of Clinical Medicine
|January 23, 2024
Summary
Arrhythmogenic cardiomyopathy with left ventricular involvement poses a significant risk for sudden cardiac death. Current risk scores often underestimate this danger, necessitating a review to identify key risk factors.
Area of Science:
- Cardiology
- Cardiac Electrophysiology
- Cardiovascular Imaging
Background:
- Arrhythmogenic cardiomyopathy (ACM) is a myocardial disease causing fibrosis and ventricular arrhythmias.
- Left ventricular involvement is common in ACM and develops early.
- Existing risk stratification scores often underestimate arrhythmic risk in ACM patients with left ventricular involvement.
Purpose of the Study:
- To review current literature on arrhythmic risk stratification in arrhythmogenic cardiomyopathy.
- To identify key features associated with increased arrhythmic risk in ACM patients with left ventricular involvement.
Main Methods:
- Literature review of studies on arrhythmic risk stratification.
- Analysis of data concerning left ventricular involvement in arrhythmogenic cardiomyopathy.
- Synthesis of findings to identify high-risk features.
Main Results:
- Left ventricular involvement is a significant factor in ACM arrhythmic risk.
- Current risk stratification tools are inadequate for this patient group.
- Specific clinical, imaging, and genetic features require further investigation for risk assessment.
Conclusions:
- Accurate risk stratification in ACM with left ventricular involvement is crucial.
- Further research is needed to refine risk assessment tools for these patients.
- Improved risk stratification can guide therapeutic strategies and prevent sudden cardiac death.
Related Concept Videos
01:28Mechanism of Cardiac Arrhythmias
922
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.
922
01:28Disturbances in Heart Rhythm
961
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...
Arrhythmias are categorized by their speed, rhythm, and origin. A slow...
961
01:16ECG Interpretation of Arrhythmias I: Sinus Arrhythmias
216
Arrhythmias are disturbances in the heart's rhythm that lead to abnormal heartbeats. These irregularities can originate from different parts of the heart and are classified based on their origin and nature.
Types of Arrhythmias
Sinus Node Arrhythmias
Sinus Bradycardia: Originating from the sinoatrial (SA) node, sinus bradycardia involves slower impulses, resulting in a heart rate of less than 60 beats per minute (bpm). Causes include sleep, vagal stimulation, beta-blockers, hypothyroidism,...
Types of Arrhythmias
Sinus Node Arrhythmias
Sinus Bradycardia: Originating from the sinoatrial (SA) node, sinus bradycardia involves slower impulses, resulting in a heart rate of less than 60 beats per minute (bpm). Causes include sleep, vagal stimulation, beta-blockers, hypothyroidism,...
216
01:24Antiarrhythmic Drugs: Class II Agents as β-Adrenergic Blockers
746
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...
746
01:19Electrophysiology of Normal Cardiac Rhythm
4.4K
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...
4.4K
01:12Antiarrhythmic Drugs: Class III Agents as Potassium Channel Blockers
1.0K
Class III antiarrhythmic drugs are a group of medications that can prolong action potentials in the heart. They achieve this by blocking potassium channels or enhancing inward currents from sodium channels. However, these drugs have a unique property of "reverse use-dependence," which is most pronounced at slower heart rates and can lead to torsades de pointes—a specific type of arrhythmia. However, it is essential to note that excessive QT interval prolongation—a measure of...
1.0K