领先I的S/QRS比:与需要永久起器相关的表面心电学发现,在患有右捆分支阻塞的患者中
Behzad B Pavri1, Jack Goodman1, Eitan Frankel1
1Thomas Jefferson University Hospital, Philadelphia, PA 19107.
Heart rhythm
|May 21, 2025
概括
领先I的缩小S波,S/QRS比率低于0.56,预测需要永久起器 (PPM) 在右捆分支阻塞 (RBBB) 的患者. 这一发现有助于识别需要PPM的患者.
科学领域:
- 心脏病学 心脏病学
- 电力生理学 电力生理学
- 医学诊断 医学诊断 医学诊断
背景情况:
- 右束支部阻塞 (RBBB) 可以表明潜在的心脏导电系统疾病.
- I中的S波反映了右心室脱极化,其持续时间和振幅提供了诊断线索.
- 形成了一个假设,I中的特定S波特征可能预测需要永久起器 (PPM).
研究的目的:
- 为了评估S/QRS比率在I作为心电图 (ECG) 标记器预测需要PPM在RBBB患者.
- 确定心电图测量是否可以识别需要PPM的RBBB患者.
主要方法:
- 对218名RBBB患者的ECG进行了回顾性分析,分为对照组 (没有PPM) 和病例组 (接受了PPM).
- 测量包括PR间隔,QRS轴,QRS持续时间 (QRSd),I中的S波持续时间,以及S/QRS比率.
- 患者因各种心脏阻塞类型或昏迷而接受了PPM.
主要成果:
- 在PPM组中,S/QRS比率在随访期间显著下降,从0.52降至0.43 (P<.001).
- 一个S/QRS比率<0.56独立地与增加对PPM的需求相关 (OR 6.87,P <.001).
- 在PPM组中,QRS持续时间也增加了 (P < .001),但S/QRS比率仍然是一个重要的预测指标.
结论:
- 降低I的S/QRS比率 (<0.56) 是对RBBB.患者需要PPM的重要预测指标.
- 这种心电图测量提供了有价值的预后信息,即使经QRS持续时间调整.
- 这些发现支持使用I中的S/QRS比率用于RBBB患者的风险分层.
相关概念视频
Disturbances in Heart Rhythm
812
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...
812
ECG Interpretation of Arrhythmias I: Sinus Arrhythmias
161
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,...
161
Antiarrhythmic Drugs: Class I Agents as Sodium Channel Blockers
1.2K
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,...
1.2K
Electrocardiogram Fundamentals
471
Introduction
An electrocardiogram (ECG) is a diagnostic tool for identifying cardiac conditions such as arrhythmias, conduction abnormalities, and myocardial ischemia.
Definition
An electrocardiogram (ECG) visualizes the heart's electrical activity by tracing the electrical movement associated with each heartbeat on a graph or monitor. As the heart beats, an electrical wave passes through it, correlating with the cardiac cycle events.
Parts of an ECG
An ECG utilizes electrodes on the skin...
An electrocardiogram (ECG) is a diagnostic tool for identifying cardiac conditions such as arrhythmias, conduction abnormalities, and myocardial ischemia.
Definition
An electrocardiogram (ECG) visualizes the heart's electrical activity by tracing the electrical movement associated with each heartbeat on a graph or monitor. As the heart beats, an electrical wave passes through it, correlating with the cardiac cycle events.
Parts of an ECG
An ECG utilizes electrodes on the skin...
471
Electrophysiology of Normal Cardiac Rhythm
1.9K
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...
1.9K
Mechanism of Cardiac Arrhythmias
867
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.
867


