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Related Concept Videos

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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Dysrhythmias III: Characteristics of Dysrhythmias01:29

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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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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.
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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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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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Intermittent Ventricular Pre-Excitation: Clinical Features and Electrophysiological Properties.

Antonio Gianluca Robles1,2, Zefferino Palamà2,3, Francesco Santoro4

  • 1Cardiology Department, L. Bonomo Hospital, Andria, Italy.

Journal of Cardiovascular Electrophysiology
|August 8, 2025
PubMed
Summary

Intermittent pre-excitation (IPX) shows no significant differences from persistent pre-excitation (PPX) in risk factors, except for AVRT inducibility. Invasive risk assessment via electrophysiological study is warranted for IPX.

Keywords:
Wolff–Parkinson–White syndromeelectrophysiological studyintermittent ventricular pre‐excitationrisk stratificationsudden cardiac death

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Medical Diagnostics

Background:

  • Intermittent pre-excitation (IPX) is often considered low-risk, but high-risk intermittent accessory pathways (APs) remain a diagnostic gray area.
  • Current guidelines lack clarity on risk stratification for IPX versus persistent pre-excitation (PPX).

Purpose of the Study:

  • To compare risk characteristics between symptomatic and asymptomatic patients with IPX and those with PPX.
  • To evaluate the reliability of IPX as a noninvasive marker for arrhythmic risk.

Main Methods:

  • A multicenter international registry included 392 patients undergoing electrophysiological (EP) study.
  • Data collected included arrhythmia inducibility (AVRT/AF), AP antegrade conduction properties, site, and number.

Main Results:

  • No significant demographic or EP differences were found between PPX and IPX groups, including AP properties and locations.
  • AV-reentrant tachycardia (AVRT) inducibility was more frequent in the IPX group.
  • No differences in demographic or EP features were observed between symptomatic and asymptomatic IPX patients.

Conclusions:

  • Intermittent pre-excitation (IPX) is an unreliable noninvasive marker for arrhythmic risk, similar to persistent pre-excitation (PPX).
  • AV-reentrant tachycardia (AVRT) inducibility is the only distinguishing EP feature identified.
  • An invasive risk assessment via electrophysiological study is recommended for patients with intermittent pre-excitation.