偶然的低温诱导的J波与巨大的R波相结合,由早收缩增强:一个案例报告
Koji Takahashi1, Hiroe Morioka1, Shigeki Uemura1
1Department of Cardiology, Yawatahama City General Hospital, Ehime, JPN.
Cureus
|June 21, 2024
概括
低温可以导致心电图 (ECG) 异常,包括J波 (奥斯本波). 这项研究表明J波是由延迟导电引起的,而不是外向电流,挑战了以前的假设.
科学领域:
- 心脏病学 心脏病学
- 电力生理学 电力生理学
- 医学性低温症 医学性低温症
背景情况:
- 低温时的12导电心电图 (ECG) 显示了J波 (奥斯本波),长时间的间隔和心律失常.
- J波是低温的病名,历史上归因于损伤电流或短暂的外向电流.
- 最近的发现表明J波可能与延迟导电有关,挑战了既定的理解.
研究的目的:
- 为了研究低温引起的J波的潜在机制.
- 呈现一个低温病例与新的心电图发现,包括巨大的R波和短的RR间隔.
主要方法:
- 一个患有低温症的病人的病例报告分析.
- 电心电图 (12导电心电图) 监测和解释.
- 审查有关低温和心电图发现的现有文献.
主要成果:
- 该病例呈现了低温引起的J波和以前未报告的巨型R波.
- 观察到短的RR间隔,与早收缩有关.
- 这些发现支持J波是由延迟导电引起的假设.
结论:
- 低温引起的J波的起源很可能是由于导电延迟.
- 这挑战了长期以来关于短暂向外电流介导的理论.
- 新的心电图发现,如巨大的R波,可能发生在严重的低温下.
更多相关视频
08:22In vitro Assessment of Myocardial Protection following Hypothermia-Preconditioning in a Human Cardiac Myocytes Model
Published on: October 27, 2020
3.0K
09:23Confirmation of Myocardial Ischemia and Reperfusion Injury in Mice Using Surface Pad Electrocardiography
Published on: November 24, 2016
13.3K
相关概念视频
Disturbances in Heart Rhythm
933
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...
933
Cardiac 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
Electrocardiogram
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
Correlation between ECG and Cardiac Cycle
4.3K
The electrical signals recorded on an electrocardiogram (ECG) occur before the mechanical processes of contraction and relaxation during the cardiac cycle.
A cardiac action potential originates in the SA node and spreads throughout the atria and the AV node in approximately 0.03 seconds. This results in the P wave in an ECG and triggers atrial contraction. The action potential is then briefly slowed at the AV node, allowing the atria to contract and fill the ventricles with blood before...
A cardiac action potential originates in the SA node and spreads throughout the atria and the AV node in approximately 0.03 seconds. This results in the P wave in an ECG and triggers atrial contraction. The action potential is then briefly slowed at the AV node, allowing the atria to contract and fill the ventricles with blood before...
4.3K
Mechanism of Cardiac Arrhythmias
910
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.
910
Electrophysiology of Normal Cardiac Rhythm
3.2K
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...
3.2K
