Pressure-flow Methods
Pressure-flow Methods - Related Videos
08:54
Measuring Blood Pressure in Mice using Volume Pressure Recording, a Tail-cuff Method
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Cited by 175 •
2009
The CODA 8-Channel High Throughput Non-Invasive Blood Pressure system measures the blood pressure in up to 8 mice or rats simultaneously. This tail-cuff system uses Volume Pressure Recording (VPR) to measure the blood pressure by determining the tail blood volume.
07:26
Synthesis and Microdiffraction at Extreme Pressures and Temperatures
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Cited by 5 •
2013
The laser heated diamond anvil cell combined with synchrotron micro-diffraction techniques allows researchers to explore the nature and properties of new phases of matter at extreme pressure and temperature (PT) conditions. Heterogeneous samples can be characterized in situ under high pressure by 2D mapping and combined powder, single-crystal and multigrain diffraction approaches.
08:57
Cross Cylindrical Flow: Measuring Pressure Distribution and Estimating Drag Coefficients
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2023
Source: David Guo, College of Engineering, Technology, and Aeronautics (CETA), Southern New Hampshire University (SNHU), Manchester, New Hampshire The pressure distributions and drag estimations for cross cylindrical flow have been investigated for centuries. By ideal inviscid potential flow theory, the pressure distribution around a cylinder is vertically symmetric. The pressure distribution upstream and downstream of the cylinder is also symmetric, which results in a zero-net drag force.
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.
09:23
Turbulence Sphere Method: Evaluating Wind Tunnel Flow Quality
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2023
Source: Jose Roberto Moreto and Xiaofeng Liu, Department of Aerospace Engineering, San Diego State University, San Diego, CA Wind tunnel tests are useful in the design of vehicles and structures that are subjected to airflow during their use. Wind tunnel data are generated by applying a controlled air flow to a model of the object being studied. The test model usually has a similar geometry but is a smaller scale compared to the full-sized object. To ensure accurate and useful data is collected...
FAQs
A pressure gradient shows the difference in pressure between two measured locations, linking the driving force to fluid movement through a biological system. Its interpretation becomes more informative when paired with the corresponding flow rate, because changes in the gradient may indicate altered transport performance. This relationship helps investigators examine circulation, ventilation, or other organ-level fluid movement under defined conditions.
Resistance summarizes how strongly a biological pathway opposes fluid movement for a given pressure difference. When pressure and flow data are collected together, investigators can identify changes in resistance rather than relying on pressure or flow alone. This supports characterization of impaired circulation or obstruction and provides a quantitative way to compare system performance across experimental conditions.
Measurements from multiple locations allow investigators to determine where pressure changes occur within a biological system. Comparing local values can help distinguish a broader performance change from a problem associated with a particular segment or region. Combined with flow-rate data, this approach strengthens interpretation of transport through vessels, airways, or other pathways without treating the system as a single undifferentiated unit.
Pressure-flow results are most interpretable when measurements are obtained under defined conditions, because changes in the surrounding experimental or clinical setup can alter both pressure and flow. Investigators should therefore document the measurement locations, the associated flow-rate data, and the conditions under which they were obtained. Consistent conditions make comparisons between patients, organs, or experiments more meaningful.
A typical workflow combines pressure measurements at one or more relevant locations with flow-rate measurements from the same system. Investigators then examine pressure differences and calculate resistance or related performance measures. The resulting values can be compared across defined conditions to identify altered transport, characterize functional impairment, and support physiological interpretation in cardiovascular or respiratory studies.
These methods are useful when clinicians or researchers need quantitative evidence about how effectively blood or air moves through an organ system. In cardiovascular and respiratory contexts, the measurements can help characterize obstruction or impaired circulation, compare function across patients, and evaluate changes under defined conditions. They also contribute to diagnosis, treatment planning, and physiological research.