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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

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 I: Introduction01:30

Acute Coronary Syndrome I: Introduction

456
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...
456
Pulse rhythm01:30

Pulse rhythm

1.2K
Pulse rhythm refers to the pattern of pulsations within specific intervals, offering valuable insights into the regularity or irregularity of the heart's beats as observed through the pattern of pulsation within specific intervals. A regular pulse exhibits a consistent heart rate with uniform waveforms and pulsation force, variations of which can be classified as normal, weak, or bounding.
Conversely, an irregular pulse pattern is termed dysrhythmia, stemming from disruptions in cardiac...
1.2K
Holter Monitor: 24-Hour Monitoring01:23

Holter Monitor: 24-Hour Monitoring

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Holter monitoring is a continuous electrocardiography (ECG) recording that tracks the heart's electrical activity over an extended period, generally 24 to 48 hours. This noninvasive diagnostic tool detects irregular heart rhythms that may not be captured during a standard ECG performed in a clinical setting.DeviceThe Holter monitor is a portable, small device connected to several electrodes on the patient's chest. These electrodes detect the heart's electrical signals and transmit them to the...
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Updated: Dec 7, 2025

Impact of High-intensity Interval Exercise and Moderate-Intensity Continuous Exercise on the Cardiac Troponin T Level at an Early Stage of Training
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A 0/1-Hour Algorithm Using High-Sensitivity Cardiac Troponin.

Kenji Inoue1, Masayuki Shiozaki1, Satoru Suwa2

  • 1Juntendo University Nerima Hospital Department of Cardiology Tokyo Japan.

Journal of Acute Medicine
|September 30, 2020
PubMed
Summary
This summary is machine-generated.

The European Society of Cardiology (ESC) recommends high-sensitivity cardiac troponin (hs-cTn) 0-hour/1-hour algorithms for suspected non-ST elevation myocardial infarction (NSTEMI). This approach accurately rules out myocardial infarction (MI) and can reduce emergency department crowding and unnecessary procedures.

Keywords:
high-sensitivity cardiac troponinhs-cTnnon ST elevation myocardial infarctionrisk stratificationtroponin

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Area of Science:

  • Cardiology
  • Biomarkers
  • Emergency Medicine

Background:

  • The European Society of Cardiology (ESC) guidelines advocate for high-sensitivity cardiac troponin (hs-cTn) 0-hour/1-hour algorithms in patients with suspected non-ST elevation myocardial infarction (NSTEMI).
  • These algorithms stratify patients into rule-out, observe, and rule-in groups, incorporating a critical time element.
  • The development of highly sensitive hs-cTn assays with low limits of detection and precise 99th percentiles is crucial for algorithm efficacy.

Purpose of the Study:

  • To evaluate the effectiveness of hs-cTn 0-hour/1-hour algorithms in diagnosing non-ST elevation myocardial infarction (NSTEMI).
  • To assess the potential of these algorithms to reduce emergency department (ED) crowding and unnecessary invasive procedures like coronary angiography (CAG).

Main Methods:

  • Application of the ESC-recommended hs-cTn 0-hour/1-hour algorithm in a prospective Asian study of approximately 400 patients with suspected NSTEMI.
  • Analysis of patient stratification into rule-out, observe, and rule-in groups based on hs-cTn levels and time points.
  • Evaluation of outcomes including need for urgent CAG and diagnosis of myocardial infarction (MI) or unstable angina (UA) within 30 days.

Main Results:

  • The hs-cTn algorithm demonstrated high specificity and negative predictive value (>95%) for ruling out MI.
  • In a prospective Asian study, no patients in the rule-out or observe groups required urgent CAG within 30 days, despite some undergoing elective procedures.
  • The introduction of hs-cTn assays correlated with an increase in NSTEMI diagnoses and a decrease in unstable angina diagnoses.

Conclusions:

  • The hs-cTn 0-hour/1-hour algorithm is a valuable tool for the rapid and accurate assessment of patients with suspected NSTEMI.
  • This algorithm shows potential to significantly decrease emergency department workload and avoid unnecessary invasive cardiac interventions.
  • Combining hs-cTn algorithms with novel risk scores may further enhance diagnostic performance in NSTEMI evaluation.