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Related Concept Videos

Electrocardiogram01:29

Electrocardiogram

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 the T...
Acute Coronary Syndrome II: Pathophysiology and Clinical Manifestations01:19

Acute Coronary Syndrome II: Pathophysiology and Clinical Manifestations

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...
Electrocardiogram Fundamentals01:28

Electrocardiogram Fundamentals

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 to...
ECG Interpretation of Rhythms01:24

ECG Interpretation of Rhythms

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

Correlation between ECG and Cardiac Cycle

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...
Acute Coronary Syndrome I: Introduction01:30

Acute Coronary Syndrome I: Introduction

Acute Coronary Syndrome (ACS) encompasses a spectrum of heart conditions caused by sudden obstruction of coronary arteries, typically resulting from the rupture of an atherosclerotic plaque and subsequent thrombus (blood clot) formation. This obstruction can lead to partial or complete blockage of blood flow, causing varying degrees of myocardial ischemia or infarction.ACS includes the following clinical entities:Unstable Angina (UA)Non-ST-Elevation Myocardial Infarction (NSTEMI)ST-Elevation...

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Related Experiment Video

Updated: May 17, 2026

A Research Method For Detecting Transient Myocardial Ischemia In Patients With Suspected Acute Coronary Syndrome Using Continuous ST-segment Analysis
18:11

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

Published on: December 28, 2012

Electrocardiographic patterns mimicking ST segment elevation myocardial infarction.

Peter Pollak1, William Brady

  • 1Division of Cardiovascular Medicine, Department of Medicine, University of Virginia School of Medicine, Lee Street, Charlottesville, VA 22908, USA.

Cardiology Clinics
|October 30, 2012
PubMed
Summary

The 12-lead ECG is crucial for diagnosing ST-elevation myocardial infarction (STEMI) and guiding treatment. However, STEMI mimics and confounders can complicate diagnosis, necessitating careful evaluation to ensure timely and appropriate patient care.

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Area of Science:

  • Cardiology
  • Medical Diagnostics

Background:

  • The 12-lead electrocardiogram (ECG) is essential for diagnosing ST-elevation myocardial infarction (STEMI).
  • Accurate ECG interpretation is critical for initiating emergent reperfusion therapy in STEMI patients.
  • Non-coronary syndromes and specific ECG patterns can mimic or obscure STEMI findings.

Purpose of the Study:

  • To differentiate true STEMI from conditions that mimic or confound ECG diagnosis.
  • To highlight the importance of recognizing STEMI mimics and confounders.
  • To optimize diagnostic accuracy and treatment timeliness in patients with ST-segment elevation.

Main Methods:

  • Review of ECG findings in STEMI, STEMI mimics, and STEMI confounders.
  • Analysis of clinical scenarios involving ST-segment elevation.
  • Comparison of diagnostic criteria for STEMI versus mimic/confounder conditions.

Main Results:

  • STEMI mimics (e.g., pericarditis, early repolarization) present with ST-segment elevation but have non-coronary causes.
  • STEMI confounders (e.g., LBBB, LVH, paced rhythms) obscure definitive STEMI diagnosis on ECG.
  • Accurate differentiation is key to appropriate management.

Conclusions:

  • Distinguishing STEMI from mimics and confounders on a 12-lead ECG is clinically vital.
  • Prompt diagnosis of STEMI ensures timely reperfusion therapy.
  • Avoiding delays in diagnosing alternative causes of ST-segment elevation is crucial for patient outcomes.