Lesson 5B (Part 2) Flashcards Preview

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Flashcards in Lesson 5B (Part 2) Deck (21)
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1

What are sonographic applications for the portal vein? (3)

1. Portal vein hypertension
2. Detect tumor invasion
3. Detect thrombosis

2

Hepatopetal flow

Flow is directed towards the liver

3

Hepatofugal flow

Flow is directed away from the liver

4

What is considered normal flow through the portal vein system?

Hepatopetal flow

5

What is the usual cause of hepatofugal flow in the liver?

Cirrhosis

6

Liver failure

Loss of function of 80-90% of liver cells

7

What are complications of liver failure? (2)

1. Hepatic encephalopathy
2. Impaired protein synthesis
- serum albumin
- PTT

8

What can cause portal hypertension

Veins around the scar tissue become obstructed

9

How does hepatic encephalopathy happen?

A build up of toxins in your blood due to loss of function

10

PTT

Amount of time it takes for your blood to clot

11

What is considered normal portal pressure?

5-10 mm/Hg

12

At what pressure do complications arise form portal hypertensiton?

12 mm/Hg

13

What occurs with portal hypertension? (4)

1. Varices
- little veins around get larger
2. Ascites
- surrounding fluid
3. Esophageal varices
- main complication
4. Portal /splenic veins will enlarge

14

What dies high pressure help to create?

Collaterals

15

What do patients with cirrhosis experience?

Rapid growth of scar tissue in the liver
- can lead to obstructions

16

What do porto-systemic collaterals form?

The opening and dilatation of prexisting vascular channels

17

Portosystemic anastomoses

Body connecting the portal system to the systemic system

18

What are the most important portosystemic anastomoses? (2)

1. Gastroesophageal collaterals
2. Esophageal varices

19

Within a week of birth the unbilical vein is obliterated, what ligament does it become?

Round
- ligamentum teres

20

What happens to the round ligament under extreme pressure?

May open to allow passage of blood

21

What does extreme pressure to the rough ligament come from? (2)

1. Cirrhosis
2. Portal hypertension