Search results
Results from the WOW.Com Content Network
The normal hepatic vein Doppler waveform is typically described in four parts, including atrial contraction and right atrium pressure elevation.
The normal periodic hepatic vein waveform is typically described in four parts: a wave: atrial contraction. coinciding with the "p wave" on the electrocardiogram, contraction elevates pressure within the right atrium creating a gradient for late diastolic filling of the right ventricle.
Passive hepatic congestion, also known as congested liver in cardiac disease, describes the stasis of blood in the hepatic parenchyma, due to impaired hepatic venous drainage, which leads to the dilation of central hepatic veins and hepatomegaly.
Budd-Chiari syndrome, also known as hepatic venous outflow obstruction (HVOO), refers to the clinical picture that occurs when there is partial or complete obstruction of the hepatic veins.
Ultrasound. The imaging modality of choice, which may show: hepatomegaly splenomegaly. portal venous abnormalities: portal vein dilatation. portal venous pulsatility. decreased portal venous flow velocity. may progress to hepatofugal flow. hepatic arterial abnormalities. elevated hepatic artery resistive index (> 0.8)
The resistive index (RI) is the most common Doppler parameter used for hepatic arterial evaluation. The usual range in normal, as well as post-transplant individuals, is between 0.55 and 0.8. It is measured by: Resistive index (RI) = (peak systolic velocity - end-diastolic velocity)/peak systolic velocity. Hepatic arterial resistive index is ...
Contrast-enhanced ultrasound may have a role in the diagnosis of cirrhosis, as diminished mean hepatic venous transit time is similar to that of perfusion CT 13. CT. CT is insensitive in early cirrhosis. More established findings include: surface and parenchymal nodularity. regenerative nodules (majority): isodense/hyperdense to the rest of liver
Hepatic vein Doppler is also often performed in the work-up for tricuspid regurgitation. The tricuspid valve may be consistently visualized in the right ventricle modified parasternal long axis, apical 4 chamber, and right ventricular inflow-outflow views; only the modified parasternal long axis allows visualization of the posterior valve leaflet.
Portal venous flow is normally towards the liver (hepatopetal), with the normal main portal vein peak systolic velocities usually measuring 20-40 cm/s 1,3. The mean flow velocity of portal vein in adults is 19.3 cm/s 6 .
TIPS evaluation is useful to ensure that a transjugular intrahepatic portosystemic shunt (TIPS) is working properly and that no stenosis has occurred within the stent. Ultrasound is often used as a first-line modality.