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Related Concept Videos

Electrocardiogram01:29

Electrocardiogram

3.3K
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.
Three major waveforms are present in a typical ECG recording: the P wave, the QRS complex, and...
3.3K
ECG Interpretation of Rhythms01:24

ECG Interpretation of Rhythms

4.3K
An electrocardiogram (ECG)graphically represents the heart's electrical activity on ECG paper or a monitor.
Components of the Electrocardiogram
The primary components of a normal ECG waveform in Normal sinus rhythm(NSR) include the P wave, PR interval, QRS complex, ST segment, T wave, and occasionally a U wave.
ECG waveforms are divided by vertical and horizontal lines at standard intervals.
The horizontal axis measures time and rate, and the vertical axis measures amplitude or voltage....
4.3K
Electrocardiogram Fundamentals01:28

Electrocardiogram Fundamentals

887
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...
887
ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias01:25

ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias

180
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...
180
Dysrhythmias IV: Characteristics of Bradyarrhythmias01:18

Dysrhythmias IV: Characteristics of Bradyarrhythmias

130
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...
130
ECG Interpretation of Arrhythmias I: Sinus Arrhythmias01:16

ECG Interpretation of Arrhythmias I: Sinus Arrhythmias

429
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,...
429

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Related Experiment Video

Updated: Sep 22, 2025

Noninvasive Electrocardiography in the Perinatal Mouse
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Multiple QRS Morphologies: Findings on an Initial Newborn ECG.

Omar Meziab1, Craig J Byrum2, Jess Randall3

  • 1Department of Cardiology, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts, USA.

JACC. Case Reports
|May 26, 2022
PubMed
Summary

This study presents an uncommon cause of wide complex tachycardia in neonates. The electrocardiogram revealed multiple QRS configurations, suggesting a rare diagnosis in infants without heart disease.

Keywords:
AV, atrioventricularAVN, atrioventricular nodeECG, electrocardiogramLBBB, left bundle branch blockVA, ventriculoatrialatriofascicular fiberpediatricwide complex tachycardia

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Area of Science:

  • Pediatric Cardiology
  • Neonatal Electrocardiography
  • Cardiac Electrophysiology

Background:

  • Wide complex tachycardia (WCT) in neonates typically has a broad differential diagnosis.
  • Identifying the etiology of WCT is critical for appropriate management in this population.
  • Structural heart disease is often considered in neonates presenting with WCT.

Purpose of the Study:

  • To describe an unusual case of wide complex tachycardia in a neonate.
  • To highlight an uncommon underlying diagnosis for WCT in infants without structural heart disease.
  • To emphasize the importance of detailed electrocardiogram analysis in neonatal arrhythmias.

Main Methods:

  • Case report presentation.
  • Electrocardiogram (ECG) analysis.
  • Review of relevant literature on neonatal arrhythmias.

Main Results:

  • The electrocardiogram demonstrated wide complex tachycardia with multiple QRS morphologies.
  • The patient was a neonate without evidence of structural heart disease.
  • An uncommon etiology for the wide complex tachycardia was suspected.

Conclusions:

  • Wide complex tachycardia in neonates can arise from rare underlying conditions.
  • Electrocardiographic pattern recognition is crucial for diagnosing challenging neonatal arrhythmias.
  • Further investigation may be warranted for unexplained WCT in neonates, even without structural abnormalities.