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相关概念视频

Decreased pulse rate01:14

Decreased pulse rate

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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...
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Cardiac Action Potential01:30

Cardiac Action Potential

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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
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ECG Interpretation of Arrhythmias I: Sinus Arrhythmias01:16

ECG Interpretation of Arrhythmias I: Sinus Arrhythmias

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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,...
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Dysrhythmias III: Characteristics of Dysrhythmias01:29

Dysrhythmias III: Characteristics of Dysrhythmias

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Dysrhythmias, also known as arrhythmias, are irregular heart rhythms that result from abnormal electrical activity in the heart, affecting its ability to circulate blood efficiently. Tachyarrhythmias, a subset of dysrhythmias, are characterized by abnormally fast heart rates exceeding 100 beats per minute. Here are some types of tachyarrhythmias with their distinct ECG features:Sinus Tachycardia:Sinus tachycardia presents a regular heart rhythm with an increased rate of 101-180 beats per...
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Dysrhythmias IV: Characteristics of Bradyarrhythmias01:18

Dysrhythmias IV: Characteristics of Bradyarrhythmias

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Bradyarrhythmias are cardiac rhythm disorders characterized by a slower-than-normal heart rate, typically defined as fewer than 60 beats per minute. Some of which are discussed here:Sinus BradycardiaSinus bradycardia presents a heart rate lower than 60 beats per minute, with a regular rhythm originating from the SA node. The ECG typically shows normal P waves preceding each QRS complex, a normal PR interval (0.12 to 0.20 seconds), and a normal QRS duration (0.06 to 0.10 seconds).First-Degree AV...
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ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias01:25

ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias

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Arrhythmia is a condition characterized by an irregular heart rhythm, with ECG changes that differ based on its origin and nature. The types of arrhythmias discussed below include atrial, junctional, and ventricular arrhythmias.Atrial ArrhythmiasPremature Atrial Complexes (PACs): PACs are early atrial beats caused by stress, caffeine, alcohol, electrolyte imbalances, hypoxia, hyperthyroidism, or certain medications (e.g., bronchodilators and decongestants). The ECG shows early P waves with an...
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相关实验视频

Updated: May 6, 2026

Programmed Electrical Stimulation in Mice
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延长QRS持续时间与死亡的关联在一个临床试验中,用于鼻节功能障碍的心脏起器治疗.

Michael O Sweeney1, Anne S Hellkamp, Kerry L Lee

  • 1Cardiac Arrhythmia Service, Brigham and Women's Hospital, 75 Francis St, Boston, MA 02115, USA. mosweeney@partners.org

Circulation
|May 4, 2005
PubMed
概括
此摘要是机器生成的。

延长的QRS持续时间 (QRSd) 预测了接受心脏起器的鼻节功能障碍患者的死亡. 较高的QRSd值与死亡风险增加有关,但与心力衰竭住院无关.

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科学领域:

  • 心脏病学 心脏病学
  • 电力生理学 电力生理学
  • 医学预测 医学预测

背景情况:

  • 延长的QRS持续时间 (QRSd) 是已知的预测因素死亡率和心力衰竭住院治疗心力衰竭患者.
  • 在需要心脏起器治疗的鼻节功能障碍患者中,基线QRSd的预后意义仍然不清楚.

研究的目的:

  • 调查基线QRS持续时间与死亡风险和心力衰竭住院的风险之间的关联,在接受心脏起器植入的鼻节功能障碍患者中.

主要方法:

  • 从2010年MOST试验 (Mode Selection Trial) 患者的12导电心电图中分析了基线QRS持续时间.
  • 这项研究是一项为期6年的随机试验,比较了双室与腹腔节奏在患有鼻节功能障碍的患者中.
  • 用调整的考克斯比例危险模型来评估死亡和心力衰竭住院预测因素.

主要成果:

  • 在23.4%的患者中观察到基线QRS持续时间>=120毫秒,并且与年龄较大,较低的射出分数,心肌病和先前心力衰竭有关.
  • 基线QRS持续时间>=120毫秒独立预测死亡风险增加 (HR 1.35;95% CI 1.07-1.70;P=0.010),但不是心力衰竭住院治疗.
  • 随着QRS持续时间从60到120毫秒 (P=0.002),死亡风险逐渐增加,在调整后,10毫秒的增加与1.14倍更高的危险比率 (95%CI1.05-1.23) 相联系.

结论:

  • 在需要心脏起器治疗的鼻节功能障碍患者中,基线QRS持续时间>=120毫秒显著与死亡风险增加有关.
  • 增加QRS持续时间是该患者群体死亡率的有价值的预后标志物.