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Related Concept Videos

Electrocardiogram01:29

Electrocardiogram

2.8K
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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Acute Coronary Syndrome III: Diagnostic Studies01:30

Acute Coronary Syndrome III: Diagnostic Studies

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Diagnosing acute coronary syndrome or ACS begins with a thorough patient history. Notable symptoms include central, crushing chest pain radiating to the left arm, neck, jaw, or back, along with shortness of breath, sweating (diaphoresis), nausea, vomiting, dizziness, and palpitations.It is crucial to note any history of cardiac illnesses and assess risk factors, including age, gender, smoking, hypertension, diabetes, hyperlipidemia, and a sedentary lifestyle.During physical examination, vital...
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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.
The horizontal axis measures time and rate, and the vertical axis measures amplitude or voltage....
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Acute Coronary Syndrome II: Pathophysiology and Clinical Manifestations01:19

Acute Coronary Syndrome II: Pathophysiology and Clinical Manifestations

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The pathophysiology of Acute Coronary Syndrome [ACD] involves several key processes:The main underlying cause of ACD is atherosclerosis, a chronic inflammatory disease characterized by the buildup of lipid-laden plaques within the coronary arteries.As the atherosclerotic plaque grows in the coronary artery, it may become unstable due to the formation of a lipid-rich core and a thin fibrous cap. Inflammatory cells within the plaque, such as macrophages, secrete enzymes that degrade the...
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Correlation between ECG and Cardiac Cycle01:25

Correlation between ECG and Cardiac Cycle

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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...
7.7K
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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Related Experiment Video

Updated: Aug 13, 2025

A Research Method For Detecting Transient Myocardial Ischemia In Patients With Suspected Acute Coronary Syndrome Using Continuous ST-segment Analysis
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A Research Method For Detecting Transient Myocardial Ischemia In Patients With Suspected Acute Coronary Syndrome Using Continuous ST-segment Analysis

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QT interval dynamics in patients with ST-elevation MI.

Tomer Mann1, Amit Moses1, Anastasiea Yesaulov1

  • 1Department of Cardiology, Tel Aviv Sourasky Medical Center and Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel.

Frontiers in Cardiovascular Medicine
|January 23, 2023
PubMed
Summary
This summary is machine-generated.

Prolonged QT intervals in ST-elevation myocardial infarction (STEMI) patients are linked to higher mortality. QT dynamics and duration, particularly in women, are crucial for predicting long-term outcomes.

Keywords:
QTSTEMIall-cause mortalitydynamicsgender

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Area of Science:

  • Cardiology
  • Clinical Electrophysiology

Background:

  • Prolonged QT intervals are associated with ventricular arrhythmias in ST-elevation myocardial infarction (STEMI).
  • Limited understanding exists regarding QT interval dynamics, characterization, and long-term prognostic value in STEMI patients.

Purpose of the Study:

  • To characterize QT interval dynamics in patients with STEMI.
  • To determine the association between QT interval and mortality in STEMI patients.

Main Methods:

  • Retrospective analysis of 1,054 patients hospitalized for STEMI.
  • Electrocardiograms (ECGs) were analyzed for QT interval duration.
  • Median follow-up of 6 years for mortality assessment.

Main Results:

  • QT interval was longer in women compared to men (P=0.001).
  • QT prolongation was more pronounced in females, elderly patients, and those with LAD occlusion STEMI.
  • A QT cutoff of 445 ms identified a high-risk group with increased all-cause mortality.
  • QT intervals measured on arrival, day 2, and before discharge correlated with long-term mortality.

Conclusions:

  • QT duration is frequently prolonged in STEMI and predicts increased mortality and adverse events.
  • Gender significantly influences QT interval dynamics during STEMI.