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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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ECG Interpretation of Rhythms01:24

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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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Exercise Stress Test01:26

Exercise Stress Test

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Introduction
Exercise stress testing, commonly known as a treadmill test, is a noninvasive procedure used to evaluate cardiovascular function and diagnose heart conditions.
Definition
An exercise stress test measures the heart's response to exertion using a treadmill or stationary bicycle. Chest electrodes record the heart's electrical activity through an ECG, and blood pressure is monitored regularly.
Purposes
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Electrocardiogram Fundamentals01:28

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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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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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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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A Research Method For Detecting Transient Myocardial Ischemia In Patients With Suspected Acute Coronary Syndrome Using Continuous ST-segment Analysis
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Non-conscious detection of ST-segment elevation during physician ECG interpretation.

Gregory J DiGirolamo1, Nikolaos Kakouros2, Federico Sorcini3

  • 1Department of Psychology, College of the Holy Cross, Worcester, MA, United States of America; Department of Radiology, UMass Chan Medical School, Worcester, MA, United States of America.

Journal of Electrocardiology
|October 24, 2025
PubMed
Summary

Physicians missed 18% of ST-elevation myocardial infarctions (STEMIs) on ECGs. Eye-tracking revealed non-conscious detection of STEMIs, suggesting a sophisticated diagnostic mechanism beyond conscious recognition.

Keywords:
ECGErrorsEye-trackingNon-consciousST-elevations

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Area of Science:

  • Cardiology
  • Medical Imaging
  • Cognitive Neuroscience

Background:

  • Electrocardiograms (ECGs) are crucial for diagnosing ST-elevation myocardial infarctions (STEMIs).
  • Diagnostic errors in STEMI interpretation can lead to delayed treatment and adverse patient outcomes.
  • Understanding the cognitive processes underlying ECG interpretation is essential for improving accuracy.

Purpose of the Study:

  • To investigate the role of non-conscious cognitive processes in the detection of STEMIs on ECGs.
  • To determine if physicians' eye movements reveal subconscious detection of missed STEMIs.
  • To explore the potential of eye-tracking technology in enhancing ECG interpretation.

Main Methods:

  • Eight experienced physicians interpreted 90 ECGs (45 STEMI, 45 Normal) without clinical context.
  • Eye movements were recorded during ECG interpretation using eye-tracking technology.
  • Physicians consciously marked recognized or considered STEMIs.

Main Results:

  • Physicians missed 18% of STEMIs.
  • Eye-tracking data showed significantly longer viewing durations (P=0.02) and increased transitions (P=0.02) to ECG leads with missed STEMIs compared to normal leads.
  • More frequent fixations (P=0.02) were observed on leads with missed STEMIs.

Conclusions:

  • Non-conscious cognitive processes contribute to STEMI detection, even when not consciously recognized.
  • The findings suggest a holistic, non-conscious mechanism for identifying culprit lesion sites on ECGs.
  • Eye-tracking technology holds promise for improving ECG interpretation accuracy and reducing diagnostic errors in clinical practice.