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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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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 (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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Electrocardiogram01:29

Electrocardiogram

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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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Echocardiography plays a role in assessing cardiac health and detecting heart conditions, with various types providing critical insights for diagnosis and treatment.
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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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Could contrast-enhanced CT detect STEMI prior to electrocardiogram?

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Contrast-enhanced computed tomography (CT) detected myocardial hypoperfusion in a patient with atypical symptoms and a normal electrocardiogram (ECG). This imaging technique may aid in diagnosing myocardial infarction when initial ECGs are inconclusive.

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Area of Science:

  • Cardiology
  • Radiology
  • Medical Imaging

Background:

  • Myocardial infarction (MI) diagnosis typically relies on electrocardiogram (ECG) and troponin levels.
  • Atypical presentations and normal initial ECGs can complicate MI diagnosis.
  • Contrast-enhanced computed tomography (CT) offers high-resolution imaging of cardiac structures.

Observation:

  • A patient presented with atypical symptoms suggestive of MI but had a normal ECG on admission.
  • Contrast-enhanced CT was the initial diagnostic modality used.
  • The CT scan revealed evidence of myocardial hypoperfusion.

Findings:

  • A subsequent ECG showed ST-segment elevation, and troponin levels were elevated.
  • Coronary angiography confirmed occlusion of the left anterior descending artery.
  • Percutaneous coronary intervention was performed after failed thrombolysis.

Implications:

  • High-resolution contrast-enhanced CT may serve as an early diagnostic tool for suspected MI, especially with normal initial ECGs.
  • Further research is needed to establish the role of CT in MI workup alongside or as an alternative to coronary angiography.
  • This case highlights the potential of advanced imaging in identifying acute coronary syndromes with non-specific initial findings.