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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.
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Calcium-Scoring CT ScanA calcium-scoring CT scan, also known as coronary artery calcium (CAC) scan, detects calcium deposits in the coronary arteries. This test assesses the risk of coronary artery disease (CAD), which can lead to cardiovascular events such as angina, heart failure, and sudden cardiac arrest.A calcium-scoring CT scan is generally recommended for individuals at intermediate risk of CAD without symptoms. It includes:Men aged 40-75 and women aged 50-75: Especially those with a...
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Acute Coronary Syndrome III: Diagnostic Studies01:30

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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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Blood Studies for Cardiovascular System I: Cardiac Biomarkers01:20

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Cardiac biomarkers are enzymes, proteins, and hormones released into the blood when cardiac cells are injured. They are powerful tools for triaging.
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Troponins
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Acute Coronary Syndrome I: Introduction01:30

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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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Acute Coronary Syndrome II: Pathophysiology and Clinical Manifestations01:19

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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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Updated: Dec 30, 2025

Histological Quantification of Chronic Myocardial Infarct in Rats
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Estimating Myocardial Infarction Size With a Simple Electrocardiographic Marker Score.

Daniel C Lee1, Christine M Albert2, Dhiraj Narula3

  • 1Northwestern University Feinberg School of Medicine Chicago IL.

Journal of the American Heart Association
|January 25, 2020
PubMed
Summary
This summary is machine-generated.

A simple electrocardiogram (ECG) score, the DETERMINE Score, effectively estimates myocardial infarction (MI) size. This accessible tool improves risk assessment for post-MI patients, offering a cost-effective alternative to advanced imaging.

Keywords:
electrocardiographymagnetic resonance imagingmyocardial infarctionprognosissudden death

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Area of Science:

  • Cardiology
  • Medical Imaging
  • Electrocardiography

Background:

  • Myocardial infarction (MI) size is critical for patient prognosis.
  • Cardiovascular magnetic resonance (CMR) is the gold standard for MI quantification.
  • Electrocardiography (ECG) offers a more accessible and cost-effective method for MI assessment.

Purpose of the Study:

  • To quantify the relationship between ECG markers and CMR-derived infarct size.
  • To evaluate the efficacy of the DETERMINE Score in estimating MI size.
  • To compare the DETERMINE Score with LVEF and the Modified Selvester Score.

Main Methods:

  • Analysis of ECG leads for Q waves, fragmented QRS, and T wave inversion in 551 post-MI patients.
  • Calculation of the DETERMINE Score based on weighted ECG markers.
  • Quantification of left ventricular ejection fraction (LVEF) and MI size (MI%) using CMR.

Main Results:

  • MI% increased significantly with the number of ECG markers (P<0.001).
  • The DETERMINE Score demonstrated strong correlation with MI% (R²=0.18), approaching LVEF accuracy (R²=0.22) and surpassing the Modified Selvester Score (R²=0.09).
  • The DETERMINE Score improved MI% estimation when added to LVEF or the Modified Selvester Score in multivariable analysis.

Conclusions:

  • A simple ECG-based DETERMINE Score effectively estimates myocardial infarction size.
  • This score enhances infarct size estimation beyond LVEF alone.
  • The DETERMINE Score presents a promising, inexpensive tool for risk assessment in post-MI patients.