布鲁加达综合征中运动诱导的QRS延长:改善疾病表型和诊断的影响
Praloy Chakraborty1, Mahbod Rahimi2, Adrian M Suszko2
1Division of Cardiology, Peter Munk Cardiac Center, University Health Network, Toronto, Ontario, Canada; Heart Rhythm Institute, University of Oklahoma Health Science Center, Oklahoma City, Oklahoma, USA.
JACC. Clinical electrophysiology
|June 27, 2024
概括
运动压力测试显示,运动期间QRS持续时间的延长是布鲁加达综合征 (BrS) 的关键指标. 这一发现有助于诊断BrS,并以非侵入性方式预测procainamide反应.
科学领域:
- 心脏病学 心脏病学
- 电子生理学 电子生理学
- 医学诊断 医学诊断 医学诊断
背景情况:
- 布鲁加达综合征 (BrS) 的特点是静止时异常的室内激活.
- 目前用于BrS的诊断方法可能需要进一步改进以提高准确性.
研究的目的:
- 调查布鲁加达综合征在运动压力测试期间心室激活的动态变化的诊断效用.
- 评估运动诱导的心电图 (ECG) 变化是否可以改善疾病表型和诊断BrS.
主要方法:
- 在53名BrS患者和52名对照患者的压力测试期间对12导电图进行了回顾性分析.
- 通过QRS持续时间 (QRSd) 评估双心室激活和使用S波和终端R波持续时间使用右心室激活.
- 评估运动诱导的QRSd变化,以预测在单独的测试和验证队列中的procainamide反应.
主要成果:
- 虽然对照组在运动期间显示QRSd缩短,但BrS患者表现出QRSd延长 (P < 0.001).
- 与对照组相比,BrS患者的恢复QRSd明显长 (P = 0.002).
- 在V6中运动诱导的QRSd延长显示出高灵敏度和特异性,可以预测积极的普罗卡因胺反应.
结论:
- 运动诱导的QRSd延长是BrS的一致发现,与右心室激活延迟有关.
- 这种心电图表现型作为一个有价值的,非侵入性的工具来预测procainamide反应.
- 这些发现表明,压力测试可以帮助在药理挑战之前诊断BrS.
相关概念视频
01:29Electrocardiogram
2.3K
An electrocardiogram (ECG or EKG) is a critical diagnostic tool that records the electrical signals produced by the heart during each heartbeat. This recording is achieved through electrodes placed strategically on the arms, legs, and chest. The electrocardiograph amplifies these signals and produces 12 distinct tracings, offering a comprehensive understanding of the heart's electrical activity.
Three major waveforms are present in a typical ECG recording: the P wave, the QRS complex, and...
Three major waveforms are present in a typical ECG recording: the P wave, the QRS complex, and...
2.3K
01:30Cardiac Action Potential
1.3K
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
1.3K
01:16ECG Interpretation of Arrhythmias I: Sinus Arrhythmias
209
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,...
209
01:26Exercise Stress Test
195
Introduction
Exercise stress testing, commonly known as a treadmill test, is a noninvasive procedure used to evaluate cardiovascular function and diagnose heart conditions.
Definition
An exercise stress test measures the heart's response to exertion using a treadmill or stationary bicycle. Chest electrodes record the heart's electrical activity through an ECG, and blood pressure is monitored regularly.
Purposes
Exercise stress testing, commonly known as a treadmill test, is a noninvasive procedure used to evaluate cardiovascular function and diagnose heart conditions.
Definition
An exercise stress test measures the heart's response to exertion using a treadmill or stationary bicycle. Chest electrodes record the heart's electrical activity through an ECG, and blood pressure is monitored regularly.
Purposes
195
01:14Decreased pulse rate
536
Bradycardia is a medical condition in which the heart rate is slower than normal. It occurs when the heart's natural pacemaker, the sinus node, generates slower electrical impulses than the standard rhythm. In adults, bradycardia is diagnosed when the pulse rate falls below 60 beats per minute, indicating a deviation from the normal heart rate range.
There are specific risk factors that can elevate the likelihood of developing bradycardia. Advanced age is a significant factor, with...
There are specific risk factors that can elevate the likelihood of developing bradycardia. Advanced age is a significant factor, with...
536
01:24Antiarrhythmic Drugs: Class II Agents as β-Adrenergic Blockers
735
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...
735