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Related Concept Videos

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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Introduction
An electrocardiogram (ECG) is a diagnostic tool for identifying cardiac conditions such as arrhythmias, conduction abnormalities, and myocardial ischemia.
Definition
An electrocardiogram (ECG) visualizes the heart's electrical activity by tracing the electrical movement associated with each heartbeat on a graph or monitor. As the heart beats, an electrical wave passes through it, correlating with the cardiac cycle events.
Parts of an ECG
An ECG utilizes electrodes on the skin...
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ECG Interpretation of Arrhythmias I: Sinus Arrhythmias01:16

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Arrhythmias are disturbances in the heart's rhythm that lead to abnormal heartbeats. These irregularities can originate from different parts of the heart and are classified based on their origin and nature.
Types of Arrhythmias
Sinus Node Arrhythmias
Sinus Bradycardia: Originating from the sinoatrial (SA) node, sinus bradycardia involves slower impulses, resulting in a heart rate of less than 60 beats per minute (bpm). Causes include sleep, vagal stimulation, beta-blockers, hypothyroidism,...
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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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The electrical signals recorded on an electrocardiogram (ECG) occur before the mechanical processes of contraction and relaxation during the cardiac cycle.
A cardiac action potential originates in the SA node and spreads throughout the atria and the AV node in approximately 0.03 seconds. This results in the P wave in an ECG and triggers atrial contraction. The action potential is then briefly slowed at the AV node, allowing the atria to contract and fill the ventricles with blood before...
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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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General Approach to a Wide QRS Complex.

Roberto De Ponti1, Giuseppe Bagliani2, Luigi Padeletti3

  • 1Cardiology Department, University of Insubria, Varese, Italy.

Cardiac Electrophysiology Clinics
|August 26, 2017
PubMed
Summary
This summary is machine-generated.

Interpreting wide QRS complex on an electrocardiogram (ECG) is vital for distinguishing ventricular tachycardia from supraventricular tachycardia with aberrancy. Algorithms use ECG criteria to identify key differences for accurate diagnosis.

Keywords:
AberrancyQRS complexSupraventricular tachycardiaVentricular tachycardiaWide complex tachycardia

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Medical Diagnostics

Background:

  • Wide QRS complexes on electrocardiograms (ECGs) indicate altered cardiac activation patterns.
  • Accurate interpretation is essential for effective clinical decision-making.

Purpose of the Study:

  • To outline diagnostic approaches for wide QRS complex tachycardias.
  • To differentiate between ventricular tachycardia and supraventricular tachycardia with aberrancy.

Main Methods:

  • Utilizing established electrocardiogram (ECG) criteria for differential diagnosis.
  • Applying algorithms based on ventriculoatrial dissociation and atypical QRS morphologies.
  • Considering structural heart conditions that affect normal activation patterns.

Main Results:

  • ECG criteria can identify signs of ventriculoatrial dissociation.
  • Morphologies inconsistent with typical bundle branch block suggest specific diagnoses.
  • Underlying cardiac conditions complicate the differentiation process.

Conclusions:

  • Systematic ECG analysis is key to diagnosing wide QRS complex tachycardias.
  • Differentiating ventricular tachycardia from aberrantly conducted supraventricular tachycardia requires careful application of diagnostic criteria.
  • Structural heart disease poses challenges in the differential diagnosis of these arrhythmias.