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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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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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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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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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Tachyarrhythmias are a type of dysrhythmia where the heart rate exceeds 100 beats per minute. Here are some common types of tachyarrhythmias:Sinus TachycardiaSinus tachycardia originates from increased impulses from the sinus node, leading to an elevated heart rate. It is often triggered by stress, fever, or exercise.Patients may experience palpitations, a sensation of a racing heart, dizziness, and chest discomfort.Causes and Risk Factors: Common causes include physical exertion, emotional...
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Dysrhythmias V: Evaluating Dysrhythmias01:30

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Dysrhythmias, also known as arrhythmias, are disturbances in the heart's rhythm that range from benign to life-threatening. A thorough evaluation is crucial for appropriate management and involves a comprehensive medical history, physical examination, and various diagnostic tests.Medical HistorySymptoms: Collect detailed information on palpitations, dizziness, syncope, chest pain, and fatigue. Note their onset, frequency, and triggers.Previous Cardiac Issues: Document any history of heart...
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Atypical Cases of Typical Atrial Flutter? A Case Study.

Roberto De Ponti1, Jacopo Marazzato1, Fabio Angeli2

  • 1Department of Heart and Vessels, Ospedale di Circolo, Viale Borri, 57, Varese 21100, Italy; Department of Medicine and Surgery, University of Insubria, Viale Guicciardini, 9, Varese 21100, Italy.

Cardiac Electrophysiology Clinics
|September 24, 2022
PubMed
Summary

Catheter ablation for typical atrial flutter is safe and effective, but complex cases require careful assessment. Advanced mapping techniques are crucial for managing challenging arrhythmias and ensuring successful ablation strategies.

Keywords:
Atypical atrial flutterCatheter ablationElectroanatomic mappingElectrophysiologic studyTypical atrial flutter

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Area of Science:

  • Electrophysiology
  • Cardiac Arrhythmia

Background:

  • Typical atrial flutter ablation is generally safe and effective.
  • Potential challenges during ablation can be missed if not properly identified.

Observation:

  • Longer cycle lengths with isoelectric lines may indicate a complex arrhythmogenic substrate.
  • Prior cardiac surgery can alter the atrial substrate, leading to complex arrhythmias.
  • Isthmus-dependent circuits may be encountered, requiring specific ablation strategies.

Findings:

  • Conduction block of the cavotricuspid isthmus without the clinical arrhythmia can lead to missed diagnoses.
  • Electroanatomic mapping is essential for guiding procedures in complex cases.
  • Identifying and addressing modified atrial substrates is key to successful ablation.

Implications:

  • Ablation strategies must be tailored to individual patient substrates.
  • Comprehensive pre-procedural assessment is vital for managing potential pitfalls.
  • Electroanatomic mapping improves the safety and efficacy of atrial flutter ablation.