Regulation of Cardiac Activity and Circulation Flashcards Preview

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Flashcards in Regulation of Cardiac Activity and Circulation Deck (47)
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1

What happens to the arterial pressure as compliance decreases?

The systolic pressure will increase and the diastolic pressure will decrease.

The pulse pressure will widen as a result.

2

What happens to the arterial pressure as the peripheral resistance increases?

The systolic and diastolic pressure will both increase but the diastolic pressure will increase much more.

3

What happens to the arterial pressure as compliance increases?

The systolic pressure will decrease and the diastolic pressure will increase.

The pulse pressure will narrow as a result.

4

What happens to the arterial pressure as peripheral resistance decreases?

The systolic and diastolic pressure will both decrease, but the diastolic pressure will decrease more.

5

How does an increase in the cardiac output affect the mean arterial pressure?

It will increase it

6

How does an increase in the heart rate affect the mean arterial pressure?

It will increase the cardiac output, which will increase the mean arterial pressure.

7

How does an increase in venous return affect mean arterial pressure?

It will increase the cardiac output and it will increase the mean arterial pressure.

8

How does a decrease in the blood volume affect the mean arterial pressure?

It will lower the venous return and lower the mean arterial pressure.

9

How does anemia affect the mean arterial pressure?

It will lower the hematocrit, which will decrease blood viscosity and it will decrease the resistance which will decrease the mean arterial pressure.

10

How does increased metabolic activity affect the mean arterial pressure?

Metabolites will cause dilation of the vessels and the resistance will decrease as a result, and the mean arterial pressure will be decreased.

11

How will angiotensin affect the mean arterial pressure?

It will cause vasoconstriction, which will increase the resistance and increase the pressure.

12

What is the mean right atrial pressure?

2 mmHg

13

What is the right ventricular systolic pressure?

25 mmHg

14

What is the right ventricular diastolic pressure?

2 mmHg

15

What is the mean left atrial pressure?

6 mmHg

16

What is the left ventricular systolic pressure?

120 mmHg

17

What is the left ventricular diastolic pressure?

6 mmHg

18

What is the pulmonary artery pressure?

25/10 mmHg

19

What is the pulmonary wedge pressure?

6 mmHg

20

What is the mean brachial artery pressure?

95 mmHg

21

What is the mean central venous pressure?

5 mmHg

22

Is the intrathoracic or extra thoracic venous pressure greater?

Extrathoracic

23

Why is the extra thoracic venous pressure greater than the intrathoracic pressure?

The blood is coming off of the arteries which have a higher pressure than the CVP which is in the intrathoracic cavity.

24

What effect does aortic stenosis have on aortic arterial pressure?

The aortic arterial can actually decrease due to the stenosis creating a larger pressure gradient.

Normal is 120/80 -> 110/75

25

What effect does aortic stenosis have on left ventricular pressure?

The after load would have a massive increase and it would go up to 220/10 from the normal 115/5

26

What effect does aortic stenosis have on pulmonary artery pressure?

It would only have a slight increase from 25/10 to 30/18

27

What effect does aortic stenosis have on the central venous pressure?

Largely unchanged

28

What effect does aortic stenosis have on heart rate?

It would increase the heart rate slightly going from a normal 72 to 84 due to the increased after load reduction the cardiac output. Baroreceptor reflex.

29

What effect does aortic valve stenosis have on the left atrial pressure?

It is mostly unchanged going from 6 to 12.

30

What effect does mitral valve stenosis have on arterial pressure?

It will decrease the arterial pressure from normal to 84/52 due to causing problems with preload.

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