Venous Return

Question 1

Mean Circulatory Filling Pressure

Answer 1

1000mL/(compliance, 140mL/mmHg) = 7 mmHg

Question 2

Central vs. Peripheral Venous Compartments

Answer 2

Thoracic vessels going into and including R atrium vs. everything else

Question 3

Why Blood Gathers in Peripheral Venous

Answer 3

Most compliance

Question 4

Venous Return =

Answer 4

(Ppv - Pcv)/R

Question 5

Venous Return Relationship to Central Venous Pressure

Answer 5

Inverse relationship

Question 6

Pcv Relationship to Cardiac Output

Answer 6

Pcv = Filling pressure of R heart, thus affecting output of R heart. However in steady state output of R and L heart should be equal, so it should have same effects on L heart

Question 7

Blood Volume and Venous Function Curve

Answer 7

Increase in Ppv shifts curve to R, decrease to L

Question 8

Venous Pressure Physiologic Value Determinant

Answer 8

Because Pcv has an inverse relationship w/ venous return and direct relationship w/ cardiac output, it is automatically driven to a level where those two are equal

Question 9

2 Clinical Measurements of Pcv

Answer 9

Observation of neck veins filling using semi recumbent table
Insert venous pressure cath tip to near R atrium

Question 10

Flow directed venous catheter

Answer 10

Measurement of L atrium filling pressure, stick balloon cath through R atrium up until gets wedged at terminal branch of pulmonary vascular, that pressure is L atrium filling pressure