Abdominal Vasculature - Part 4 Flashcards
What does the MPV drain? (4 )
- Gastrointestinal tract
- Pancreas
- Spleen
- GB
How much blood does the MPV supply to the liver?
70%
What makes up the MPV? (2)
- Splenic vein
2. SMV
When does the MPV bifurcate?
Just beyond the porta hepatis
What should the MPV not exceed? (3)
- 1.3cm in diameter in adults greater than 20 years of age
- 1.0cm in diameter between 10 and 20 years of age
- 0.85cm in diameter less than 10 years of age
What kind of flow does the MPV demonstrate?
Phasic low-flow velocities toward the liver
- hepatopetal
What happens to blood flow after inspiration in the MPV?
Will decrease
What happens to blood flow after expiration in the MPV?
Will increase
What happens to the MPV diameter after a meal?
It will increase
Where does the splenic vein course?
Posterior to the pancreas and crosses anterior to the superior mesenteric
artery
What kind of flow is demonstrated by the splenic vein?
Spontaneous phasic flow away from the spleen and toward the liver
- hepatopedal
What is the size of the splenic vein?
10mm or less
What happens to the splenic vein diameter with inspiration?
It increases
What does the splenic vein drain? (3)
- Spleen
- Pancreas
- Portion of the stomach
Where does the SMV course?
parallel to the SMA
What kind of flow is demonstrated by the SMV?
Spontaneous phasic flow toward the liver
What is the normal diameter of the SMV?
10mm or less
What happens to the diameter of the SMV during inspiration and following a meal?
It increases
What does the SMV drain? (3)
- Small intestines
- Ascending colon
- Transverse colon
Where does the right gonadal vein empty into?
IVC
Where does the left gonadal vein empty into?
Into the left renal vein
- occasionally into the left
suprarenal vein
Where do the lumbar veins a branch of?
The common iliac veins
Where do the lumbar veins course?
Lateral to the spine and posterior to the psoas muscles
Where does the abdominal aorta compared to the IVC?
Lies to the left of midline
Where does the abdominal aorta course?
Courses inferior and anterior in the abdomen to the level of the fourth lumbar vertebra
- umbilicus
What does the abdominal aorta bifurcate into?
Right and left common iliac arteries
Where does the IVC lie compared to the abdominal aorta?
To the right of midline
What level does the IVC form at?
Formed at the level of the fifth lumbar vertebra at the junction of the right and left
common iliac veins
Where does the IVC course?
Superiorly in the abdomen to the right atrium of the heart
Where does the IVC lay compared to the head of the pancreas?
Posterior
What should the size of the normal abdominal aorta not exceed in diameter?
3cm
What should the size of the normal suprarenal artery not exceed in diameter?
2.5cm
What should the size of the normal renal artery not exceed in diameter?
1.5cm
What should the size of the normal infrarenal artery not exceed in diameter?
1.5cm
What should the size of the normal common iliac artery not exceed in diameter?
1.0cm
What is the size of the IVC?
Less than 2.5cm
What happens to the IVC during inspiration?
It increases
What happens to the IVC during expiration?
It decreases
What is the US appearance of the aorta? (3)
- Anechoic tubular structure
- Thin hyper echoic wall margins
- Internal vascular flow
What kind of resistance is demonstrated in the aorta?
High-resistance multiphasic parabolic flow pattern
What kind of resistance is demonstrated in the IVC?
Spontaneous phasic flow and multiphasic pulsatile flow as it nears the diaphragm
