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Imaging Studies for Cardiovascular System II:Types of Echocardiography01:20

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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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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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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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Microbubble Contrast Agent Use During Invasive Coronary Microvascular Assessment.

Rahul Bahl1, Samay Mehta1, Henry Seligman1

  • 1Faculty of Medicine, National Heart and Lung Institute, Imperial College London, London, United Kingdom.

Journal of the Society for Cardiovascular Angiography & Interventions
|November 21, 2025
PubMed
Summary
This summary is machine-generated.

Ultrasound microbubbles improve invasive coronary flow reserve (CFR) Doppler signals in patients with poor baseline quality. This enhances measurement reliability for coronary microvascular assessment in clinical practice.

Keywords:
angina with non-obstructed coronary arteriescoronary flow reservecoronary microvascular dysfunctioncoronary physiologymicrovascular angina

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Area of Science:

  • Cardiology
  • Medical Imaging
  • Vascular Physiology

Background:

  • Invasive Doppler-derived coronary flow reserve (CFR) assessment faces challenges with Doppler signal quality, hindering clinical use.
  • Poor signal quality limits the reliability of coronary microvascular function measurements.

Purpose of the Study:

  • To evaluate if ultrasound microbubble contrast agents can improve Doppler signal quality during invasive CFR measurements.
  • To assess the impact of microbubbles on reducing measurement variability in coronary flow velocity.

Main Methods:

  • Coronary flow velocity was measured using a Doppler sensor-tipped wire in 15 participants.
  • Baseline Doppler signal quality was assessed, and participants were grouped into good or poor quality.
  • Signal-to-noise ratio, AI-based Doppler envelope quality score, and coefficient of variation were analyzed after microbubble administration (SonoVue).

Main Results:

  • In patients with poor baseline signals (N=10), microbubble contrast significantly improved signal-to-noise ratio, Doppler envelope quality, and reduced coefficient of variation (P < .05).
  • No significant changes were observed in patients with good baseline signals (N=5).
  • Microbubble administration did not induce significant coronary hyperemia (P = .875).

Conclusions:

  • Ultrasound microbubble contrast agents effectively enhance Doppler signal quality in invasive CFR measurements.
  • These agents hold potential for improving the reliability of coronary microvascular assessment in clinical settings.
  • Enhanced signal quality may facilitate wider adoption of invasive CFR for diagnosing coronary microvascular dysfunction.