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The Cardiac Cycle01:13

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The heart beats rhythmically in a sequence called the cardiac cycle—a rapid coordination of contraction (systole) and relaxation (diastole).
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Electrical signals—sent from the sinoatrial (SA) node in the right atrial wall to the atrioventricular (AV) node between the right atrium and right ventricle—cause both atria to simultaneously contract. When the signal reaches the AV node, it pauses for approximately a tenth of a second, allowing the atria to contract and...
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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.
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The cardiac cycle refers to the sequence of events that occur in the heart from the beginning of one heartbeat to the next. It's characterized by alternating periods of contraction (systole) and relaxation (diastole) of the heart muscles.
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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.
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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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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...
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Dual-loop intra-atrial reentry in humans.

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  • 1Department de Rhythmologie, Hôpital Cardiologique du Haut-Lévêque, Bordeaux-Pessac, France.

Circulation
|February 15, 2000
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Summary

Dual-loop atrial reentrant tachycardias, previously undescribed, were observed in patients post-atrial septal defect surgery. Ablating one loop transformed the tachycardia, necessitating a second ablation for complete resolution.

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Cardiac Surgery

Background:

  • Dual-loop atrial reentrant tachycardias are not clinically described.
  • Patients with drug-resistant atrial tachycardia post-atrial septal defect closure were studied.

Purpose of the Study:

  • To describe and characterize dual-loop atrial reentrant tachycardias.
  • To investigate the electrophysiological mechanisms and ablation strategies for these tachycardias.

Main Methods:

  • Utilized multipolar catheters and 3-dimensional electroanatomic mapping (Biosense) in five patients.
  • Performed linear radiofrequency ablation targeting the narrowest parts of the identified reentrant loops.

Main Results:

  • Six figure-8 dual-loop tachycardias were mapped, with cycle lengths of 262±40 ms.
  • Ablation of one loop (cavotricuspid isthmus) transformed the tachycardia into a single-loop arrhythmia requiring a second ablation.
  • No recurrences were observed after a mean follow-up of 19±6 months.

Conclusions:

  • Figure-8 double-loop tachycardias can mimic common atrial flutter post-surgical atriotomy.
  • Ablation of one loop results in a new tachycardia requiring a second ablation at a different isthmus.