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Related Concept Videos

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.
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Dysrhythmias IV: Characteristics of Bradyarrhythmias01:18

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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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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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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.
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Electrophysiology of Normal Cardiac Rhythm01:19

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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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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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Ablation of Ischemic Ventricular Tachycardia Using a Multipolar Catheter and 3-dimensional Mapping System for High-density Electro-anatomical Reconstruction
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Split accessory pathway potentials in a patient with antidromic AVRT.

Weizhuo Liu1,2, Wentao Gu2, Xinping Luo2

  • 1Department of Critical Care Medicine, Shanghai Chest Hospital, Shanghai Jiaotong University, Shanghai, China.

Journal of Cardiovascular Electrophysiology
|January 22, 2022
PubMed
Summary
This summary is machine-generated.

Split pathway potentials in Wolff-Parkinson-White syndrome indicate slow conduction and can be an effective ablation target. This case highlights intra-pathway conduction delay as a key finding for successful ablation.

Keywords:
antidromic AVRTcatecholamine-dependent pre-excitationintrapathway delaypathway automaticitysplit pathway potentials

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Area of Science:

  • Electrophysiology
  • Cardiology

Background:

  • Accessory pathway potential is a key indicator for ablation in Wolff-Parkinson-White syndrome.
  • Mild pre-excitation on surface ECG can be associated with accessory pathways.

Observation:

  • A 27-year-old female with palpitations presented with mild pre-excitation.
  • An accessory pathway with weak anterograde conduction was identified.
  • Isoproterenol infusion unmasked significant pre-excitation and induced antidromic atrioventricular reentrant tachycardia.

Findings:

  • Widely split double pathway potentials were observed during mapping at the tricuspid annulus.
  • These potentials indicated intra-pathway conduction delay.
  • Radiofrequency ablation at this site resulted in accelerated pathway rhythm and elimination of the accessory pathway, rendering tachycardia noninducible.

Implications:

  • Split pathway potentials can signify slow conduction within accessory pathways in pre-excitation syndromes.
  • Identifying and ablating sites with split potentials can be crucial for successful treatment of Wolff-Parkinson-White syndrome.
  • This case demonstrates the diagnostic and therapeutic value of detailed electrophysiological mapping.