measuring vascular pressure Flashcards

1
Q

Aortic pulse pressure

A

normal is 49mmhg (20-80mmHg)

pulse pressure= SP-DP

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2
Q

what factors affect pulse pressure ?

A
  • Stroke Volume

- vessel elasticity (Aorta)

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3
Q

what is the mean arterial pressure ?

A

Avg pressure within artery over complete cardiac cycle

normal values 70-105

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4
Q

right sides pressure

A
CVP- (0-8)
RVEDP- (0-8)
RVESP 15-30 (24)
Pulm art. pressure diastolic  (8-15)
PAPS- (15-30)
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5
Q

left sided pressures

A
PCWP- 4-12
LAP 4-12
LVEDP 4-12
LVESP 90-140
AORTIC PRESSSURE S 90-140
AORTIC PRESSURE D 60-80
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6
Q

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

A

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

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7
Q

what’s the formula for calculating resistace

A

SVR= MAP- CVP
———————— x80
CO

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8
Q

what’s the normal range for SVR

A

800-1600 dynesseccm-5

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9
Q

what are the factors affecting SVR ?

A

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

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10
Q

factors affecting PVR

A

same factors as SVT

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

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