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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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Conduction System of the Heart01:20

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The cardiac conduction system produces and transmits electrical impulses that prompt myocardial contraction, ensuring efficient heart function. This intricate system ensures that the heart beats in a coordinated and efficient manner, beginning with the atria and then the ventricles. The conduction system optimizes cardiac output by maintaining this precise sequence, which is crucial for adequate blood circulation.
This system relies on the unique properties of nodal and Purkinje cells:...
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Conduction System of the Heart01:19

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Autorhythmicity is a term that refers to the heart's inherent ability to generate electrical signals and instigate muscle contractions. This self-regulating conduction system within the heart consists of two key components: the pacemaker cells and specialized conducting cells.
The pacemaker cells are located in two primary nodes: the sinoatrial (SA) node and the atrioventricular (AV) node. The SA node pacemaker cells can autonomously depolarize, triggering an action potential that leads to the...
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Mechanism of Cardiac Arrhythmias01:28

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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.
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ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias01:25

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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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Disturbances in Heart Rhythm01:29

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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.
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Microelectrode Array Recording of Sinoatrial Node Firing Rate to Identify Intrinsic Cardiac Pacemaking Defects in Mice
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Nodo sinusal y arritmias auriculares

Roy M John1, Saurabh Kumar2

  • 1From Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA. rjohn2@partners.org.

Circulation
|May 12, 2016
PubMed
Resumen
Este resumen es generado por máquina.

La disfunción del nodo sinusal (SND) y la fibrilación auricular (AF) a menudo coexisten debido a la remodelación auricular compartida. El tratamiento para la ENS y la FA depende de si predomina la FA o la miocardiopatía auricular fibrótica.

Palabras clave:
ablación, catéterFibrilación auricularparalización auricularmarcapasos artificialesSíndrome del seno enfermoNodo sinoatrial

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Área de la Ciencia:

  • Cardiología
  • Electrofisiología
  • Fisiopatología auricular

Sus antecedentes:

  • La disfunción del nodo sinusal (SND) y las arritmias auriculares, particularmente la fibrilación auricular (AF), frecuentemente coexisten.
  • Los mecanismos precisos que vinculan SND y AF siguen siendo incompletamente entendidos.
  • Ambas condiciones implican remodelación estructural y eléctrica del miocardio auricular.

Objetivo del estudio:

  • Revisar los conocimientos actuales sobre la fisiopatología del nodo sinusal.
  • Para aclarar la compleja relación entre la enfermedad de los ganglios sinusales y las arritmias auriculares.
  • Informar estrategias de tratamiento personalizadas basadas en el fenotipo de la enfermedad.

Principales métodos:

  • Revisión de la literatura sobre la investigación contemporánea sobre la END y la AF.
  • Análisis de los mecanismos fisiopatológicos, incluidos los factores genéticos y estructurales.
  • Síntesis de la información relativa a los enfoques de tratamiento para la SND y la AF combinadas.

Principales resultados:

  • La SND puede ser causada por la remodelación eléctrica de la FA, o ambas condiciones pueden surgir de la remodelación estructural auricular progresiva.
  • La fibrilación auricular se asocia a menudo con los desencadenantes y el sustrato auricular izquierdo.
  • La disfunción del nodo sinusal está relacionada con cambios estructurales, particularmente en la aurícula derecha.

Conclusiones:

  • Las estrategias de tratamiento para la ENS y la FA deben ser individualizadas en función del fenotipo predominante.
  • La ablación por catéter beneficia a los pacientes con FA y END secundaria.
  • La estimulación cardíaca es una terapia primaria para pacientes con miocardiopatía atrial fibrótica predominante.