Coronary Flow Velocity
Coronary Flow Velocity - Related Videos
06:39
Ultrasound Based Assessment of Coronary Artery Flow and Coronary Flow Reserve Using the Pressure Overload Model in Mice
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Cited by 20 •
2015
Coronary flow reserve (CFR) is useful for assessment of myocardial oxygen demand and evaluation of cardiovascular risk. This study establishes a step-by-step transthoracic Doppler echocardiographic (TTDE) method for longitudinal monitoring of the changes in CFR, as measured from coronary artery in mice, under the experimental pressure overload of aortic banding.
10:56
Automated Measurement of Microcirculatory Blood Flow Velocity in Pulmonary Metastases of Rats
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Cited by 2 •
2014
A method is presented to measure microcirculatory blood flow velocity in pulmonary cancer metastases of the pleural surface in rats in an automated fashion, using closed-chest pulmonary intravital microscopy. This model has potential to be used as a widespread tool to perform physiologic research on pulmonary metastases in rodents.
07:53
Micro-particle Image Velocimetry for Velocity Profile Measurements of Micro Blood Flows
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Cited by 12 •
2013
Micro-particle image velocimetry (μPIV) is used to visualize paired images of micro particles seeded in blood flows which are cross-correlated to give an accurate velocity profile. Shear rate, maximum velocity, velocity profile shape, and flow rate, each of which has clinical applications, can be derived from these measurements.
01:11
Velocity and Acceleration in Steady and Unsteady Flow
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2025
In fluid mechanics, velocity and acceleration are key concepts for analyzing particle motion in both steady and unsteady flow. Consider a fluid particle moving along a pathline, where its velocity depends on its position and time. The particle's acceleration is obtained by differentiating the velocity with respect to time. The acceleration can be generalized to any point in the flow, and expressed as components along three perpendicular directions, representing changes in velocity over time.
08:41
Ultrasound Velocity Measurement in a Liquid Metal Electrode
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Cited by 14 •
2015
Ultrasound velocimetry is used to study mixing by fluid flow in liquid metal electrodes. The focus of this manuscript is to illustrate the methods used for making precise, spatially-resolved ultrasound measurements while limiting oxidation and controlling and monitoring temperature, applied current, and the heater power being supplied.
FAQs
Doppler ultrasound estimates movement by detecting frequency shifts generated when red blood cells travel through a coronary vessel. The measured shift is translated into blood-flow speed, allowing clinicians to examine coronary circulation through functional information rather than structural appearance alone. This approach supports assessment under both resting and increased-demand conditions.
An increased-demand measurement tests whether coronary blood delivery can rise when the heart requires more oxygen. If velocity fails to increase appropriately, the finding can suggest impaired vasodilation, even when resting flow does not reveal the problem. Comparing responses across conditions therefore adds functional information about the circulation’s ability to adapt.
Coronary flow velocity can contribute to evaluating different levels of coronary dysfunction. Findings may help identify problems involving epicardial stenosis and microvascular dysfunction, giving clinicians functional evidence relevant to both larger coronary vessels and the microcirculation. These are distinct clinical targets, so interpretation should consider which part of the coronary circulation may be affected.
During a clinical assessment, Doppler ultrasound is used to obtain coronary flow velocity measurements under relevant physiologic conditions. Clinicians can examine values at rest and during increased cardiac demand, then consider whether the response indicates adequate vasodilation. The resulting comparison supports evaluation of coronary function rather than relying on a single isolated measurement.
Coronary flow reserve reflects the circulation’s capacity to increase blood delivery when demand rises. Measurements at rest and under increased demand provide the functional comparison needed to evaluate that capacity. A reduced response can point toward impaired vasodilation and helps place velocity findings in a clinically meaningful framework for cardiovascular assessment.
Medicine uses these measurements to support cardiovascular diagnosis, risk assessment, and evaluation of treatment responses. Their value extends beyond identifying whether flow changes: comparative findings can help clinicians judge functional status and determine whether it changes after treatment. Interpretation remains centered on how effectively the coronary circulation responds to increased physiologic demand.