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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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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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Dysrhythmias VI: Management of Dysrhythmias01:25

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Dysrhythmia management involves a multifaceted approach, incorporating pharmacological treatments, medical procedures, surgical interventions, lifestyle modifications, and patient education.Pharmacological ManagementAntiarrhythmic Drugs:Class I (Sodium Channel Blockers): This class includes quinidine and procainamide, which reduce the speed of impulse conduction in the heart, stabilize the cardiac membrane, and control arrhythmias. Quinidine and procainamide are Class IA agents that prolong the...
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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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Dysrhythmias II: Classification of Tachyarrhythmias01:28

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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 IV: Characteristics of Bradyarrhythmias01:18

Dysrhythmias IV: Characteristics of Bradyarrhythmias

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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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Atrial Arrhythmia Recurrence After First Direct-Current Cardioversion in People With Atrial Flutter.

Chang Yoon Doh1, Francis Phan2,3, Khidir Dalouk3

  • 1Department of Internal Medicine, Oregon Health & Science University, Portland, Oregon, USA.

Journal of Cardiovascular Electrophysiology
|August 13, 2025
PubMed
Summary
This summary is machine-generated.

A new REAL-PDX risk score predicts atrial arrhythmia recurrence after cardioversion. This score helps identify patients needing closer monitoring or intervention for better outcomes.

Keywords:
atrial arrhythmia recurrenceatrial flutterdirect‐current cardioversion

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Clinical Risk Prediction

Background:

  • Recurrence of atrial arrhythmias after direct-current cardioversion (DCCV) is common, but risk factors are not well understood.
  • Predicting recurrence is crucial for managing patients and optimizing treatment strategies.

Purpose of the Study:

  • To develop and validate a clinical predictive risk score for atrial flutter (AFL) recurrence after the first DCCV.
  • To identify key factors associated with increased risk of AFL recurrence.

Main Methods:

  • Prospective enrollment of patients with atrial arrhythmia undergoing DCCV into a Veterans Affairs EP database (2002-2016).
  • Comparison of recurrence times between atrial fibrillation (AF) and AFL using Kaplan-Meier analysis.
  • Development of the REAL-PDX risk score using Cox proportional hazards modeling in a derivation cohort and validation in a separate cohort.

Main Results:

  • The median time to recurrence was significantly longer for AFL (1.7 years) than AF (3.4 months).
  • Independent predictors of AFL recurrence included chronic kidney disease (CKD), older age, left atrial (LA) dilation, and longer duration since diagnosis.
  • The REAL-PDX score (REnal disease, Age ≥65, LA dilation, Prior Diagnosis) effectively stratified patients into high and low risk groups in the validation cohort, showing significantly shorter time to recurrence and higher risk in the high-risk group.

Conclusions:

  • The REAL-PDX risk score is a simple and effective tool for predicting AFL recurrence after DCCV.
  • This score can aid clinicians in guiding decisions regarding anticoagulation, cavotricuspid isthmus ablation, or pulmonary vein isolation.