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Related Concept Videos

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.
Three major waveforms are present in a typical ECG recording: the P wave, the QRS complex, and...
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Myocarditis II: Clinical Features and Diagnostic Tests01:27

Myocarditis II: Clinical Features and Diagnostic Tests

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Myocarditis is an inflammation of the heart muscle. The symptoms vary widely, encompassing asymptomatic presentations to severe, acute manifestations.Clinical PresentationAsymptomatic cases: In some instances, myocarditis may be asymptomatic, with the infection resolving without intervention. These cases often go undetected unless discovered incidentally through diagnostic imaging or tests conducted for other reasons.General Early Symptoms: Early symptoms of myocarditis are non-specific and can...
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ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias01:25

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

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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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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.
Ionic Basis of Cardiac Action Potentials
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Electrocardiogram Fundamentals01:28

Electrocardiogram Fundamentals

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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 Rhythms01:24

ECG Interpretation of Rhythms

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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.
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Noninvasive Electrocardiography in the Perinatal Mouse
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Electrocardiogram changes in pediatric patients with myocarditis.

Anthony G Pompa1, Lee B Beerman1, Brian Feingold2

  • 1Pediatrics, University of Pittsburgh School of Medicine, Pittsburgh, PA, United States of America.

The American Journal of Emergency Medicine
|July 2, 2022
PubMed
Summary

A significant number of pediatric myocarditis patients present with normal electrocardiograms (ECGs). Abnormal ECGs, especially ST elevation, correlate with longer hospital stays and higher troponin levels in myocarditis cases.

Keywords:
ArrhythmiaElectrocardiogramMyocarditisPediatric cardiology

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Area of Science:

  • Pediatric Cardiology
  • Electrophysiology
  • Critical Care Medicine

Background:

  • Traditionally, abnormal electrocardiograms (ECGs) are expected in pediatric myocarditis.
  • Previous studies lacked objective evaluation of ECG changes in pediatric myocarditis versus controls.
  • The correlation between specific ECG findings and clinical outcomes in pediatric myocarditis remains unexplored.

Purpose of the Study:

  • To objectively evaluate ECG changes in pediatric myocarditis patients at presentation.
  • To compare ECG findings in pediatric myocarditis patients with healthy controls.
  • To determine if specific ECG changes correlate with clinical outcomes in pediatric myocarditis.

Main Methods:

  • Retrospective case-control study of pediatric patients with acute myocarditis and matched healthy controls over seven years.
  • ECGs were interpreted by electrophysiologists blinded to patient diagnoses.
  • Analysis included ECGs from presentation through hospital discharge.

Main Results:

  • 28% of pediatric myocarditis patients had a normal ECG at presentation; 88% had abnormalities during hospitalization.
  • Myocarditis patients with abnormal presenting ECGs had longer hospital (5 vs. 2 days) and ICU stays (1 vs. 0 days).
  • ST elevation was more frequent in myocarditis patients (41% vs. 17%) and correlated with higher peak troponin levels.

Conclusions:

  • A notable percentage of pediatric myocarditis cases do not show ECG abnormalities upon initial presentation.
  • Abnormal presenting ECGs in pediatric myocarditis are associated with increased hospital resource utilization.
  • Presenting ECG characteristics, such as ST elevation, may serve as early indicators for disease severity and guide management.