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Related Concept Videos

Cardiac Output and Stroke Volume01:11

Cardiac Output and Stroke Volume

Cardiac output (CO) is an integral aspect of human physiology, reflecting the heart's efficiency and responsiveness to the body's needs. It represents the volume of blood that the left or right ventricle ejects into the aorta or pulmonary trunk each minute. The CO is calculated by multiplying the heart rate (HR)—the number of heartbeats per minute—by the stroke volume (SV)—the amount of blood pumped out with each heartbeat.
In an average resting adult male, the typical cardiac output averages...
Regulation of Stroke Volume01:27

Regulation of Stroke Volume

The regulation of stroke volume, which is the amount of blood the heart pumps out during each heartbeat, is critical for maintaining a healthy circulatory system. Stroke volume is influenced by three main factors: preload, contractility, and afterload.
Preload refers to the degree of stretch on the heart before it contracts. It's analogous to the stretching of a rubber band; the more it's stretched, the more forcefully it snaps back. This concept is encapsulated in the Frank-Starling law of the...
Cardiac Output II: Effect of Stroke Volume on Cardiac Output01:22

Cardiac Output II: Effect of Stroke Volume on Cardiac Output

Cardiac output (CO), the amount of blood the heart pumps per minute, is a parameter in cardiovascular physiology determined by stroke volume and heart rate. Stroke volume, the amount of blood pushed from one of the ventricles per heartbeat, is influenced by preload, afterload, and contractility.
Preload
Preload refers to the initial elongation of the cardiac myocytes before contraction and is related to the volume of blood filling the heart at the end of diastole, or end-diastolic volume. The...
Imaging Studies for Cardiovascular System V: CT01:28

Imaging Studies for Cardiovascular System V: CT

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

Imaging Studies for Cardiovascular System VI: Calcium -Scoring CT

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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Related Experiment Video

Updated: May 10, 2026

In vitro Assessment of Aortic Regurgitation Using Four-Dimensional Flow Magnetic Resonance Imaging
11:16

In vitro Assessment of Aortic Regurgitation Using Four-Dimensional Flow Magnetic Resonance Imaging

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Do flow-gradient groups determined by MDCT predict outcomes: validating CT stroke volume.

Faisal Rahman1, Pallavi Pandey2, Ankur Pandey3,4

  • 1Division of Cardiology, Johns Hopkins Hospital, Baltimore, MD, USA.

The International Journal of Cardiovascular Imaging
|April 9, 2025
PubMed
Summary
This summary is machine-generated.

Computed tomography blood pool based (CT-blp) analysis accurately estimates stroke volume in patients undergoing transcatheter aortic valve replacement (TAVR). This method aids in identifying low-flow, low-gradient aortic stenosis, improving patient stratification for TAVR.

Keywords:
Aortic stenosisComputed tomographyPatient outcomesStroke volumeTranscatheter aortic valve replacement

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Area of Science:

  • Cardiology
  • Medical Imaging
  • Interventional Cardiology

Background:

  • Accurate diagnosis of severe aortic stenosis is challenging, particularly in patients with low-flow states.
  • Non-invasive imaging modalities are crucial for timely diagnosis and treatment initiation.

Purpose of the Study:

  • To evaluate the accuracy of CT blood pool based (CT-blp) analysis in estimating stroke volume compared to echocardiogram and right heart catheterization.
  • To assess the performance of CT-blp in predicting 30-day and 1-year outcomes in patients undergoing transcatheter aortic valve replacement (TAVR).

Main Methods:

  • Retrospective, single-center study involving 345 patients with aortic stenosis undergoing TAVR.
  • Stroke volume calculated using CT-blp, echocardiogram, and right heart catheterization prior to TAVR.
  • Comparison of modality performance in predicting short-term and long-term clinical outcomes.

Main Results:

  • CT-blp demonstrated a stronger correlation with cath-derived stroke volume (r=0.60) than echocardiogram (r=0.37).
  • No significant difference in mortality was observed between groups stratified by flow and gradient using CT-blp or echo.
  • The composite of mortality and hospital readmission was significantly higher in the low-flow, low-gradient group identified by CT-blp (30-day OR 2.6; 1-year OR 1.9).

Conclusions:

  • CT-blp provides a reliable estimation of stroke volume, correlating well with invasive measurements in patients evaluated for TAVR.
  • CT-blp can effectively stratify patients into flow-gradient groups, aiding in the identification of low-flow, low-gradient aortic stenosis when echocardiography is limited.
  • Further research with larger cohorts is warranted to validate these findings and their clinical implications.