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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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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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Disturbances in Heart Rhythm01:28

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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 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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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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New pattern of atypical advanced interatrial block.

Tiago Luiz Silvestrini1, Cengiz Burak2, Andrés F Miranda-Arboleda2

  • 1Instituto de Ritmologia Cardíaca, Santa Catarina, Brazil.

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|August 19, 2023
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Summary

Researchers identified a new pattern of atypical interatrial block (IAB) with a distinct triphasic P-wave morphology in inferior leads. This finding may help in understanding atrial depolarization and associated risks.

Keywords:
Atrial abnormalitiesInteratrial blockP wave

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Medical Diagnostics

Background:

  • Interatrial block (IAB) is characterized by prolonged P-wave duration (≥ 120 ms) due to delayed conduction within the Bachmann bundle.
  • Advanced IAB is classified into typical and atypical forms, with atypical IAB further categorized by duration or morphology.
  • Current understanding of atypical IAB morphology is limited.

Purpose of the Study:

  • To report a novel pattern of atypical advanced interatrial block (IAB).
  • To describe the unique triphasic P-wave morphology observed in the inferior leads associated with this new IAB pattern.

Main Methods:

  • Evaluation of two clinical cases using surface electrocardiograms (ECGs).
  • Measurement of P-wave duration and amplitude using digital calipers and ECG analysis software.
  • Comparison with existing data on IAB and P-wave characteristics.

Main Results:

  • Identification of a new atypical advanced IAB pattern with prolonged P-wave duration (>160 ms).
  • Observation of a distinct triphasic P-wave morphology in all inferior leads (P +/+/- and P +/-/+).
  • Speculation that the triphasic morphology reflects sequential right-to-left atrial depolarization.

Conclusions:

  • This study presents a novel pattern of atypical advanced interatrial block.
  • Further research is needed to investigate the potential association of this new pattern with an increased risk of atrial fibrillation and stroke.