Is the portal vein monophasic?
The portal vein normally exhibits a monophasic, low-velocity Doppler signal, with slight respiratory variation. The normal range of flow velocity is wide but is usually between 20 and 40 cm/sec.
What flows into the portal vein?
Approximately 75% of total liver blood flow is through the portal vein, with the remainder coming from the hepatic artery proper….
| Portal vein | |
|---|---|
| Source | splenic vein, superior mesenteric vein, inferior mesenteric vein, pancreatic vein |
| Drains to | liver sinusoid |
| Identifiers | |
| Latin | vena portae hepatis |
What is antegrade flow in the portal vein?
The term antegrade refers to flow in the forward direction with respect to its expected direction in the circulatory system. For example, antegrade flow moves away from the heart in the systemic arteries and toward the heart in the systemic veins.
How does blood flow through the portal venous system?
Blood passes from branches of the portal vein through cavities between hepatocellular sinusoids. Blood also flows from branches of the hepatic artery and mixes in the sinusoids to supply the hepatocytes with oxygen.
What does Hepatopetal flow mean?
Hepatopetal denotes flow of blood towards the liver, which is the normal direction of blood flow through the portal vein. The term is typically used when discussing the portal vein or recanalized vein of the ligamentum teres in patients with suspected portal hypertension.
What causes Hepatofugal flow?
The most common cause of hepatofugal flow in the portal venous system is portal hypertension, which in turn is usually caused by cirrhosis, less commonly by hepatic venous outflow obstruction or extrahepatic portal vein thrombosis.
What are the tributaries of the portal vein?
The principal tributaries to the portal vein are the lienal vein, with blood from the stomach, the greater omentum (a curtain of membrane and fat that hangs down over the intestines), the pancreas, the large intestine, and the spleen; the superior mesenteric vein, with blood from the small intestine and part of the …
What drains to the portal vein?
The portal system drains the capillaries of the mesenteric and splenic veins and ends in the hepatic capillaries (Figure 76-1). The portal vein supplies partially oxygenated blood flow to the liver, supplementing the highly oxygenated blood flow of the hepatic artery to the liver.
What is Hepatopetal flow in the main portal vein?
What is portal blood flow?
Portal circulations are venous channels that connect one capillary system with another and do not depend on the central pumping action of the heart.
What are the main tributaries of the portal vein?
What is Recanalized umbilical vein?
A recanalized umbilical vein is a sonographic finding that is common in patients with cirrhosis or portal hypertension. The umbilical vein is developed in the fetus and carries oxygenated blood from… Expand. lindseysimon.weebly.com.
When is a portal vein Doppler trace monophasic?
A normal portal vein Doppler trace should be monophasic with a little variation in maximum and minimum velocity, with no reversal of flow. In this particular case, when the line drops below the 0 cm/s level, there is reversal of flow.
Where does the portal venous system develop in an embryo?
The portal venous system develops from the vitelline and umbilical veins that drain the intestinal blood of the embryo. It has been postulated that during embryologic development, there is a regression failure in the right primitive vitelline vein.
How to diagnose a portal vein aneurysm?
Abdominal ultrasound with Doppler demonstrating the portal vein aneurysm as an anechoic lesion with a monophasic, nonpulsatile venous flow pattern. Management options were discussed with the patient, who chose conservative care with serial imaging to monitor the size of the aneurysm.