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Related Concept Videos

Blood Studies for Cardiovascular System I: Cardiac Biomarkers01:20

Blood Studies for Cardiovascular System I: Cardiac Biomarkers

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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.
The essential diagnostic tools for detecting myocardial necrosis and monitoring individuals suspected of having acute coronary syndrome (ACS) include:
Troponins
Troponins, particularly cardiac troponins I and T, are the most precise and sensitive markers of myocardial injury. They are detectable within 4-6 hours of myocardial injury and remain...
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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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Acute Coronary Syndrome I: Introduction01:30

Acute Coronary Syndrome I: Introduction

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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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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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Imaging Studies for Cardiovascular System V: CT01:28

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Cardiac computed tomography (CT) scanning is an advanced cardiac imaging technique that utilizes CT technology, with or without intravenous (IV) contrast, to produce accurate cross-sectional virtual slices of specific areas of the heart, coronary circulation, and major blood vessels such as the aorta, pulmonary veins, and arteries. The computer processes these slices to generate three-dimensional images. Multidetector CT (MDCT) is a rapid form of CT scanning that captures multiple slices...
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Blood Studies for Cardiovascular System II: CRP, Hcy, and Cardiac Natriuretic Peptide Markers01:19

Blood Studies for Cardiovascular System II: CRP, Hcy, and Cardiac Natriuretic Peptide Markers

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Cardiac biomarkers are critical in diagnosing, prognosing, and managing cardiovascular diseases. Routine measurement of specific biomarkers such as B-type natriuretic peptide (BNP), C-reactive protein (CRP), and homocysteine (Hcy) is common practice in clinical settings to evaluate heart function and predict cardiovascular events.
These markers indicate stress or strain on the heart muscle:
Natriuretic Peptides (BNP)
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Related Experiment Video

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Using Extraordinary Optical Transmission to Quantify Cardiac Biomarkers in Human Serum
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High sensitive cardiac troponin T: Testing the test.

Dominik G Haider1, Thomas Klemenz1, Georg Martin Fiedler2

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|November 27, 2016
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High-sensitive cardiac troponin T (hs-TnT) shows high sensitivity but low specificity for diagnosing acute myocardial infarction (AMI). The assay detects general myocardial damage, not specific to AMI, even with international algorithms.

Keywords:
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Area of Science:

  • Cardiology
  • Biomarkers
  • Diagnostic Accuracy

Background:

  • High-sensitive cardiac troponin T (hs-TnT) is widely used for acute myocardial infarction (AMI) diagnosis.
  • hs-TnT levels vary significantly based on patient pathophysiology.
  • The diagnostic applicability of the current hs-TnT assay requires further investigation.

Purpose of the Study:

  • To evaluate the diagnostic performance of the current hs-TnT assay for acute myocardial infarction (AMI).
  • To assess the specificity and sensitivity of hs-TnT in a diverse patient population.

Main Methods:

  • Retrospective analysis of 1573 patients' hs-TnT results from an emergency department.
  • Categorization of patients into acute cardiac events (NSTEMI, STEMI) and control groups.
  • Receiver Operating Characteristic (ROC) curve analysis to determine diagnostic accuracy.

Main Results:

  • Overall hs-TnT sensitivity for acute cardiac events exceeded 92%.
  • Specificity varied around 35%, indicating limited discriminatory power.
  • Area Under the Curve (AUC) for total cardiac events was 0.81, with AUCs of 0.79 for NSTEMI and 0.84 for STEMI.
  • The ESC algorithm showed 83% sensitivity for NSTEMI but misclassified 43% of non-NSTEMIs.

Conclusions:

  • The hs-TnT assay exhibits very low specificity for diagnosing AMI.
  • Current hs-TnT assays, including delta values, reflect general myocardial damage rather than specific AMI.
  • Myocardial damage alone, as indicated by hs-TnT, is insufficient for AMI diagnosis, even with established algorithms.