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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
Electrocardiogram Fundamentals01:28

Electrocardiogram Fundamentals

884
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...
884
Correlation between ECG and Cardiac Cycle01:25

Correlation between ECG and Cardiac Cycle

8.6K
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...
8.6K
ECG Interpretation of Rhythms01:24

ECG Interpretation of Rhythms

4.2K
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....
4.2K
ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias01:25

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

174
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...
174
Cardiac Action Potential01:30

Cardiac Action Potential

2.7K
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
2.7K

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Updated: Sep 19, 2025

Real-Time Cardiac Mapping with a Noninvasive Imageless Electrocardiographic Imaging System
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Real-Time Cardiac Mapping with a Noninvasive Imageless Electrocardiographic Imaging System

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A Distinctive Electrocardiographic Pattern: Unveiling the Spiked Helmet Sign.

Mascha Bosnjak1, Thomas Nottingham2, Gabriela Strey2

  • 1School of Medicine, University of Queensland, Brisbane, Australia.

JACC. Case Reports
|May 30, 2025
PubMed
Summary
This summary is machine-generated.

The spiked helmet sign (SHS) on electrocardiogram (ECG) can indicate gastric dilatation, not heart issues. Recognizing this link is crucial for correct diagnosis and treatment of acutely ill patients.

Keywords:
Pickelhaubenelectrocardiogramgastric dilatationspiked helmet sign

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Area of Science:

  • Cardiology
  • Gastroenterology
  • Medical Diagnostics

Background:

  • The spiked helmet sign (SHS) is a rare electrocardiogram (ECG) finding characterized by ST-segment elevation.
  • This distinctive ECG pattern is often not associated with cardiac conditions, despite its appearance.

Observation:

  • A case of gastric dilatation presenting with the spiked helmet sign (SHS) on ECG is reported.
  • This observation highlights an unusual association between a gastrointestinal condition and a specific ECG manifestation.

Findings:

  • SHS is identified as an uncommon manifestation of gastric dilatation, potentially caused by vagal stimulation from gastric distention.
  • This vagal stimulation can affect cardiac repolarization, leading to the observed ECG changes.
  • Differential diagnoses for ST-segment elevation include left bundle branch block, early repolarization, pericarditis, and TakoTsubo cardiomyopathy.

Implications:

  • Accurate interpretation of ECG findings, including SHS, requires considering the patient's overall clinical context and other diagnostic results.
  • Misinterpretation of SHS can lead to inappropriate management strategies.
  • Recognizing gastric dilatation as a potential cause of SHS is vital for timely and correct patient care.