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Flashcards in peripheral circulation Deck (31):
1

peripheral circulation

- pulmonary circuit
- systemic circuit
- R and L heart ventricle

2

RIGHT VENTRICLE

- weaker

3

LEFT VENTRICLE

- stronger
- more powerful pump

4

systemic circuit

- higher pressure

5

flow to pulmonary and systemic circuit

- equal

6

RIGHT AND LEFT VENTRICLE

- has EQUAL CARDIAC OUTPUT
- FLOW EQUAL

7

pulmonary arterial blood and R atrium has

- the same systemic mixed venous blood entering

8

RIGHT ATRIUM (S.C)

- 0 mm Hg pressure

9

peripheral veins (S.C)

- 15 mm Hg

10

pressure gradient (S.C)

- 93 mm Hg
- great pressure gradient
- to facilitate the return of blood to the heart
- aorta==> RA
- pressure gradient is proportional to venous return

11

R ventricle (P.C)

- 25/0 mm Hg

12

L ventricle (S.C)

- 120/0 mm Hg

13

pulmonary artery (P.C) (systolic25/diastolic8 )

- 25/8 mm Hg

14

aorta (S.C) (systolic 120/ diastolic 80)

- 120/80 mm Hg

15

Mean pulmonary artery or pulmonary wedge pressure (P.C)

- 15 mm Hg
- for LV pressure measurement

16

mean arterial blood pressure (S.C)

- 93 mm Hg

17

capillary (P.C)

- 7-9 mm Hg

18

capillary skeletal renal glomerular pressure (S.C)

30 mm Hg
45-50 mm Hg

19

L atrium (P.C)

- 5- 10 mm Hg

20

pressure gradient (P.C)

- 15-5= 10 mm Hg

21

pulmonary circuit

- begin with pulmonary artery and ends with pulmonary vein
- pressure difference PA-PV=10

22

systemic circuit

- begins with aorta and ends in right atrium (0 mm Hg)
- pressure difference aorta - RA= 93

23

patient with R ventricular failure develop peripheral edema RV (25)==>RA(0)

- normal pressure of 25 mmHg in RV will increase due to backing up of blood 40 mm Hg then normal pressure in RA 0 due to increase in the pressure in RV pressure in RA will become 20
- pressure gradient systemically 93 mm Hg make it 100
- 100 minus 20 pressure from RA
- 80 mm Hg
- therefore DECREASE IN PRESSURE GRADIENT causing decrease in venous return causing stasis of blood in peripheral veins
- causing INCREASE HYDROSTATIC PRESSURE in the capillary
- INCREASE FILTRATION
= EDEMA

24

DECREASE VENOUS RETURN

- increase capillary pressure that leads to edema

25

systemic circuit

- AORTA
- ARTERIES
- ARTERIOLES
- CAPILLARIES
- VENULES
- VEINS
- VENA CAVAE

26

ARTERIOLES

- has the GREATEST PRESSURE DROP
- 80 TO 40 mm Hg
- due to massive branching of vessels
- increases cross sectional area
- decrease fluid in vessel
BENEFITS
- low pressure in the capillaries to facilitate the filtration and exchange

27

AORTA

- SMALLEST CROSS- SECTIONAL AREA
- highest velocity

28

CAPILLARIES

- LARGEST CROSS- SECTIONAL AREA
- lowest velocity

29

velocity is

- inverse to cross sectional area
- lowest velocity

30

systemic VEINS

- has the LARGEST blood volume
- very high compliance compared to systemic ARTERIES

31

pulmonary system/VESSELS

- has the second largest blood volume
- very high compliance systemic ARTERIES