Intravascular Pressure
Intravascular Pressure - Related Videos
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.
05:51
Intracerebroventricular and Intravascular Injection of Viral Particles and Fluorescent Microbeads into the Neonatal Brain
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Cited by 18 •
2016
Here, we describe a simple method of intracerebroventricular and intravascular injection of viral particles or fluorescent microbeads into the neonatal mouse brain. The localization pattern of the virus and nanoparticles could be detected by microscopic evaluation or by in situ hybridization.
07:29
Intravascular Delivery of Biologics to the Rat Kidney
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Cited by 1 •
2016
The administration of drugs for recovery of kidney function requires control of the localization and distribution of the therapeutic compound. Here, we describe in detail a simple technique for intrarenal delivery of drugs in rats. This procedure may be easily performed with no mortality and high reproducibility.
09:43
In vivo Near Infrared Fluorescence (NIRF) Intravascular Molecular Imaging of Inflammatory Plaque, a Multimodal Approach to Imaging of Atherosclerosis
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Cited by 32 •
2011
We detail a new near-infrared fluorescence (NIRF) catheter for 2-dimensional intravascular molecular imaging of plaque biology in vivo. The NIRF catheter can visualize key biological processes such as inflammation by reporting on the presence of plaque-avid activatable and targeted NIR fluorochromes. The catheter utilizes clinical engineering and power requirements and is targeted for application in human coronary arteries. The following research study describes a multimodal imaging strategy...
02:34
Vapor Pressure
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2020
When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules move randomly about, they will occasionally collide with the surface of the condensed phase, and in some cases, these collisions will result in the molecules re-entering the condensed phase. The change from the gas phase to the liquid is called condensation. When the rate of condensation becomes equal to the rate of vaporization, neither the amount of the liquid nor the amount of the vapor...
FAQs
Cardiac contraction raises pressure as blood is ejected, producing the systolic value, whereas relaxation produces the lower diastolic value. Because pressure changes throughout the cardiac cycle, a single value cannot describe the complete pattern. Mean pressure provides an additional summary of the cycle and helps investigators evaluate cardiovascular function and hemodynamic behavior.
Pressure patterns reflect the combined effects of vessel resistance, vessel compliance, blood volume, and pressure gradients. Resistance influences opposition to flow, while compliance describes how readily vessels accommodate changes in volume. Together with the available blood volume and differences between locations, these factors help explain why pressure is not uniform throughout the circulation.
A pressure gradient is a difference in pressure between locations in the circulation, and it provides essential context for understanding blood flow. Measuring pressure at one site can therefore be less informative than considering how values change across the vascular system. Intravascular pressure studies use these relationships to examine hemodynamics and vascular physiology.
A pressure-sensitive transducer detects the force conveyed from blood within the vessel and produces a measurable record. When used with a catheter positioned inside the circulation, it allows pulsatile changes to be captured rather than treating pressure as a static quantity. This supports determination of systolic, diastolic, and mean pressure during experimental measurements.
The procedure commonly positions a fluid-filled catheter within a blood vessel and connects the catheter to a pressure-sensitive transducer. Pressure generated within the vessel is conveyed through the fluid, and the transducer records the resulting signal. The collected measurement can then be expressed as systolic, diastolic, or mean pressure for hemodynamic analysis.
Researchers measure it when they need direct information about cardiovascular function, blood-flow behavior, or vascular physiology. The approach also supports investigations of disease mechanisms and assessment of how drugs or medical interventions affect the circulation. Comparing pressure values or patterns under different conditions can reveal changes in hemodynamic state.
Measurements can distinguish the pressure reached during cardiac contraction from that present during relaxation and can also provide a mean value across the cycle. Examining these components helps characterize pulsatile cardiovascular behavior. When interpreted alongside resistance, compliance, blood volume, and pressure gradients, the results offer a broader view of circulation and vascular responses.