完全的心脏阻塞诱导的Torsades de Pointes
Benjamin A Szumowski1, Youstina Mary Beshay-Taylor1, Ramy Sadek2
1Internal Medicine, Southwest Healthcare Medical Education Consortium, Temecula, USA.
Cureus
|April 1, 2024
概括
高度的心房静脉阻塞会导致心,可能会延长QT间隔. 及时识别和治疗病因对于管理Torsades de Pointes风险至关重要.
科学领域:
- 心脏病学 心脏病学
- 电力生理学 电力生理学
- 内部医学 内部医学
背景情况:
- 高度心房 (AV) 阻塞是白心脏的一个公认的病因.
- 心率和 QT 间隔持续时间之间存在着很好的反向关系.
研究的目的:
- 突出了在管理Torsades de Pointes时鉴定胸病的病因的关键作用.
- 为了强调AV阻塞,心肌梗塞,QT延长和TdP之间的联系.
主要方法:
- 审查已建立的电生理学原则.
- 分析心率,QT间隔和心律不整的发展之间的关系.
- 讨论临床管理策略.
主要成果:
- 高度的静脉动脉阻塞直接导致胸肌梗塞.
- 胸与QT间隔延长有关.
- 延长的QT间隔是Torsades de Pointes的一个重要风险因素.
结论:
- 识别和解决白心的根本原因,如AV阻塞,对于预防和治疗Torsades de Pointes至关重要.
- 有效的管理取决于确定病因,以逆转心律失常并防止复发.
相关概念视频
01:28Disturbances in Heart Rhythm
950
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...
950
01:12Antiarrhythmic Drugs: Class III Agents as Potassium Channel Blockers
988
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...
988
01:30Cardiac Action Potential
1.4K
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
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
1.4K
01:20Antiarrhythmic Drugs: Class IV Agents as Calcium Channel Blockers
832
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...
832
01:22Antiarrhythmic Drugs: Class I Agents as Sodium Channel Blockers
1.4K
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,...
1.4K
01:28Mechanism of Cardiac Arrhythmias
918
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.
918