Lecture 18: Arterial System and Pulse Pressure (Hayward) Flashcards Preview

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Flashcards in Lecture 18: Arterial System and Pulse Pressure (Hayward) Deck (28):
1

BP usually measures:

arterial pressure

2

arterial or venous side has more resistance?

arterial side

3

Pressure in arterial system is a fx of:

volume in minus volume out

4

Dicrotic notch

assoc. with sudden release of push from heart; there is initial fast recoil that is very fast, which means there will be a squeeze of blood on arterial system that is greater than what's leaving at that time

5

What physiological factors determine arterial pressure?

cardiac output, vascular resistance

6

What physical factors determine arterial pressure?

blood volume, vessel compliance. We have less control over these

7

increased vessel compliance --> change in pressure for same volume in?

decreased

8

increased cardiac output --> MAP at constant TPR?

increases

9

Increased TPR with constant cardiac output --> MAP?

Increases

10

Total energy =

= KE + PE = systolic energy

11

What type of energy is used to move blood forward during diastole?

PE

12

outflow >>>inflow in ________

diastole

13

inflow > outflow in _______

systole

14

changes in CO force changes in _____ if TPR remains the same

MAP

15

pulse pressure =

systolic pressure - diastolic pressure

16

MAP formulas

MAP = CO * TPR = (HR*SV) * TPR = Pdia + [(Psys - Pdia)/3]

17

systolic pressure

peak pressure generated when heart pumps blood out to arterial system

18

Main factors contributing to systolic pressure (3)

1) ventricular stroke volume
2) rate of ejection
3) compliance of aorta

19

increased SV with all else same--> systolic pressure?

increases (i.e. athlete)

20

decreased compliance with all else same --> systolic pressure

increases

21

increased stroke volume --> diastolic pressure

decreases

22

importance of pulse pressure

tells you how volume is moving through the CV system. Pressure felt when feeling a pulse

23

hypertension

high resistance in system

24

aortic insufficiency during diastole --> arterial pressure, pulse pressure?

arterial pressure drops, pulse pressure rises

25

2 Possible causes of low pulse pressure

1) hemorrhage
2) congestive heart failure (damage to heart tissue)

26

3 possible causes of high pulse pressure

1) bradycardia (results in slow filling)
2) hypertension
3) decreased aortic compliance

27

measuring diastolic pressure

point when flow changes from turbulent to laminar flow when pressure cuff released

28

Normal system vs. pulmonary MAP

systemic: 100mmHg, pulmonary: 10mmHg

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