measuring vascular pressure

Question 1

Aortic pulse pressure

Answer 1

normal is 49mmhg (20-80mmHg)

pulse pressure= SP-DP

Question 2

what factors affect pulse pressure ?

Answer 2

• Stroke Volume

- vessel elasticity (Aorta)

Question 3

what is the mean arterial pressure ?

Answer 3

Avg pressure within artery over complete cardiac cycle

normal values 70-105

Question 4

right sides pressure

Answer 4

CVP- (0-8)
RVEDP- (0-8)
RVESP 15-30 (24)
Pulm art. pressure diastolic  (8-15)
PAPS- (15-30)

Question 5

left sided pressures

Answer 5

PCWP- 4-12
LAP 4-12
LVEDP 4-12
LVESP 90-140
AORTIC PRESSSURE S 90-140
AORTIC PRESSURE D 60-80

Question 6

what’s the value of doing a pulmonary catheter monitoring ?

Answer 6

Assess venous return
RV/LV function
Cardiac Output
Assess PVR and SVR

Question 7

what’s the formula for calculating resistace

Answer 7

SVR= MAP- CVP
———————— x80
CO

Question 8

what’s the normal range for SVR

Answer 8

800-1600 dynesseccm-5

Question 9

what are the factors affecting SVR ?

Answer 9

1.)blood vessel diameter (the smaller the vessel the more resistance.
2.)Local Autoregulation – Increasing metabolic demand vasodilation
3.)Sympathetic/Parasympathetic tone
a.)Baroreceptors in Aortic Arch and Carotid vessels
I.)High BP will stimulate receptors and cause a reflex vasodilation
B.)Chemoreceptors in Aortic Arch and Carotid vessels
Changes in CO2 and Pao2 will affect vasomotor tone
4.)Hypothalmus - Increasing temp vasodilation, decreasing temp causes vasoconstriction

Question 10

factors affecting PVR

Answer 10

same factors as SVT

more emphasis on local PaO2 and CO2 gradients due to hypoxic vasocontraction