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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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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

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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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 III: Characteristics of Dysrhythmias01:29

Dysrhythmias III: Characteristics of Dysrhythmias

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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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Electrocardiogram01:29

Electrocardiogram

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An electrocardiogram (ECG or EKG) is a critical diagnostic tool that records the electrical signals produced by the heart during each heartbeat. This recording is achieved through electrodes placed strategically on the arms, legs, and chest. The electrocardiograph amplifies these signals and produces 12 distinct tracings, offering a comprehensive understanding of the heart's electrical activity.
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Prevalence of Early Repolarization Patterns in Adults.

M P Barakoti1, A Karki1, M K Chaulagain1

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Early repolarization patterns on electrocardiograms are found in 2.82% of patients. This condition, once considered benign, is now linked to sudden cardiac death, with Type II being the most common pattern.

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Public Health

Background:

  • Early repolarization (ER) on electrocardiograms, characterized by J-point elevation, was historically viewed as benign.
  • Emerging evidence suggests ER is a rare but significant cause of idiopathic ventricular fibrillation and sudden cardiac death.
  • Understanding ER prevalence is crucial for risk assessment in cardiac events.

Purpose of the Study:

  • To determine the prevalence of early repolarization patterns in patients undergoing electrocardiography at Kathmandu Medical College Teaching Hospital.
  • To analyze the distribution of different early repolarization types within the studied population.
  • To identify potential sex-based differences in ER prevalence.

Main Methods:

  • Retrospective analysis of 12-lead electrocardiograms from patients at Kathmandu Medical College Teaching Hospital.
  • Systematic review of electrocardiograms to identify and classify early repolarization patterns (Types I, II, III, and IV/Brugada).
  • Collection and analysis of patient demographic data, including sex.

Main Results:

  • The overall prevalence of early repolarization patterns was 2.82%.
  • Prevalence was higher in males (4.95%) compared to females (0.77%).
  • Type II ER pattern (inferior or inferolateral leads) was the most common (1.25%), while Type IV (Brugada pattern) was not detected.

Conclusions:

  • Early repolarization is present in a notable percentage of the studied population, with significant sex disparity.
  • Type II early repolarization is the predominant pattern observed.
  • Knowledge of ER prevalence and types aids physicians in counseling patients regarding arrhythmia and sudden cardiac death risks.