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Related Concept Videos

Imaging Studies for Cardiovascular System V: CT01:28

Imaging Studies for Cardiovascular System V: CT

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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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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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Imaging Studies for Cardiovascular System VI: Calcium -Scoring CT01:25

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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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Imaging Studies for Cardiovascular System IV: CMRI01:21

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Cardiovascular magnetic resonance imaging, or CMRI, is a non-invasive diagnostic test that employs a magnetic field and radiofrequency waves to create precise images of the heart and arteries. It provides comprehensive information about cardiac anatomy, function, perfusion, and tissue characterization without ionizing radiation.IndicationsCMRI diagnoses various heart conditions, including tissue damage from heart attacks, ischemic heart disease, myocarditis, aortic issues (tears, aneurysms,...
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Computed Tomography01:10

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Tomography refers to imaging by sections. Computed tomography (CT) is a non-invasive imaging technique that uses computers to analyze several cross-sectional X-rays to reveal minute details about structures in the body.
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Radiological investigations are paramount in the diagnosis and management of various pulmonary diseases. Two essential investigations are the Pulmonary Angiogram and the Positron Emission Tomography (PET) Scan.
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In Vivo Quantitative Assessment of Myocardial Structure, Function, Perfusion and Viability Using Cardiac Micro-computed Tomography
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Myocardial hypoperfusion on conventional contrast computed tomography.

Shing Ching1, Tak Shun Chung1

  • 1Division of Cardiology, Department of Medicine and Geriatrics, United Christian Hospital, Hong Kong, China.

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|September 1, 2015
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Summary

Non–electrocardiogram (ECG)–gated computed tomography (CT) can detect myocardial hypoenhancement, an early sign of acute myocardial infarction, before ECG changes appear. This finding aids in earlier revascularization decisions for chest pain patients.

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Area of Science:

  • Radiology
  • Cardiology
  • Emergency Medicine

Background:

  • Non–electrocardiogram (ECG)–gated contrast computed tomography (CT) is standard for diagnosing aortic dissection in patients with chest pain.
  • Myocardial assessment for hypoenhancement, indicative of ischemia, is crucial alongside aortic evaluation.

Observation:

  • Modern multidetector CT allows myocardial perfusion assessment with minimal artifact, even without ECG gating.
  • Two cases presented with acute chest pain and initially nondiagnostic studies.

Findings:

  • CT aortogram revealed myocardial hypoenhancement in the left anterior descending artery territory, a sign of acute myocardial infarction.
  • This hypoenhancement preceded ST-segment elevation on ECG.

Implications:

  • Recognizing CT-detected myocardial hypoenhancement can lead to earlier diagnosis of acute myocardial infarction.
  • This may facilitate prompt revascularization decisions, improving patient outcomes.