Hepatic Venous Pressure Gradient
Hepatic Venous Pressure Gradient - Related Videos
07:10
Measurement of the Hepatic Venous Pressure Gradient and Transjugular Liver Biopsy
0 Views •
Cited by 110 •
2020
Here, we present a protocol for measurement of hepatic venous pressure gradient (HVPG),the gold standard to diagnose clinically significant portal hypertension. Moreover, we describe how to perform a transjugular liver biopsy within the same session.
10:40
Visualization and Analysis of Blood Flow and Oxygen Consumption in Hepatic Microcirculation: Application to an Acute Hepatitis Model
0 Views •
Cited by 10 •
2012
An optical system was developed to visualize hepatic microcirculation with FITC-labeled erythrocytes and to measure the partial pressure of oxygen in the microvessels with laser-assisted phosphorimetry. This method can be used to investigate physiological and pathological mechanisms by analyzing microvascular structure, diameter, blood flow velocity, and oxygen tension.
09:52
Isolated Hepatic Perfusion as a Treatment for Liver Metastases of Uveal Melanoma
0 Views •
Cited by 23 •
2015
Here, we present a protocol how to perform an isolated liver perfusion (IHP) with melphalan and we also discuss IHP as a treatment option for liver metastases of uveal melanoma.
07:26
Synthesis and Microdiffraction at Extreme Pressures and Temperatures
0 Views •
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.
09:38
Femoral Arterial and Venous Catheterization for Blood Sampling, Drug Administration and Conscious Blood Pressure and Heart Rate Measurements
0 Views •
Cited by 53 •
2012
Chronic catheterization of blood vessels in the rat is often required for administration of substances, obtain blood sample over a period of time or for direct conscious blood pressure measurements. Femoral arterial catheterization of the rat and corresponding measurements of blood pressure in the conscious animal will be demonstrated.
FAQs
The subtraction separates pressure transmitted from the hepatic sinusoids from the pressure measured without temporary flow occlusion. Free hepatic venous pressure provides the comparison value, while wedged pressure reflects sinusoidal pressure under occlusion. Their difference therefore offers an indirect estimate of the pressure gradient relevant to portal hypertension rather than relying on either measurement alone.
Changes in the gradient provide information about the hemodynamic burden associated with cirrhosis and portal hypertension. Because HVPG is linked to intrahepatic vascular resistance, its measurement can help characterize disease severity and indicate whether the pressure-related abnormalities are changing as chronic liver disease progresses.
Portal pressure contributes to complications of chronic liver disease, including variceal bleeding. By quantifying the sinusoidal pressure gradient indirectly, HVPG helps clinicians evaluate the hemodynamic severity associated with these complications. This information supports clinical assessment and provides a measurable variable for following pressure-related risk over time.
Clinicians obtain a free hepatic venous pressure and a wedged hepatic venous pressure, then subtract the former from the latter. The wedged measurement requires temporary occlusion of blood flow so that pressure transmitted from the hepatic sinusoids can be assessed. This paired-measurement approach produces the gradient used for clinical interpretation.
HVPG can be measured in relation to treatment to determine whether a portal pressure-lowering intervention changes the underlying hemodynamic state. Comparing measurements helps clinicians assess treatment response rather than relying only on clinical observation. In this way, the gradient serves as an objective indicator of therapeutic effect in chronic liver disease.
Clinical researchers use HVPG to connect changes in intrahepatic vascular resistance with disease progression and therapeutic outcomes. Repeated or comparative measurements can therefore provide a hemodynamic endpoint for studying chronic liver disease. The method helps investigators examine whether an intervention is associated with meaningful changes in portal pressure-related physiology.