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Cardiovascular System > Haemodynamics COPY > Flashcards

Haemodynamics COPY Flashcards

1
Q

How are the right and left coronary arteries perfused?

A

Backflow of blood in aorta
to coronary ostium
enters right and left coronary arteries

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2
Q

What does the perfusion rate of the peripheries depend on?

A

Peripheral resistance

state of arterioles

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3
Q

What is the systolic uptake?

A

Increase in pressure in aorta
due to LV ejecting blood into it
in systole

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4
Q

What is another term for systolic uptake on a graph?

A

The anacrotic limb

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5
Q

What is the peak systolic pressure?

A

Maximum pressure in aorta

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6
Q

What is the average peak systolic pressure?

A

120mmHg

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7
Q

What is sytolic decline?

A

LV ejects less blood into aorta

pressure in aorta falls

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8
Q

What is the dicrotic notch?

A

Pressure in aorta is higher than LV pressure
aortic valve closes
aorta recoils
gives slight increase in pressure

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9
Q

What is the diastolic run-off?

A

Aorta recoils
pushes blood out of aorta into arteries
pressure in aorta decreases

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10
Q

What is the end-diastolic pressure?

A

Lowest pressure in aorta

at end of diastole

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11
Q

What is the average end-diastolic pressure?

A

80mmHg

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12
Q

What is the dicrotic limb?

A

The overall decline in pressure in the aorta

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13
Q

Wjhat is the pulse pressure?

A

Peak systolic pressure - end-diastolic pressure

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14
Q

What is the average pulse pressure?

A

120 - 80 = 40mmHg

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15
Q

How is mean arterial blood pressure calculated?

A

Diastolic pressure + 1/3pulse pressure

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16
Q

What is the average mean arterial pressure?

A

80 + (1/3 x 40)

80 + 13 = 93mmHg

17
Q

What happens if mean arterial pressure falls below 70mmHg?

A

Organ perfusion is impaired

18
Q

What is felt in a pulse?

A

Shock wave that arrives before the blood itself

19
Q

What does the strength of a pulse depend on?

A

Force of contraction of LV

Pulse pressure

20
Q

What can cause a decrease in the strength of a pulse?

A

LV failure
Aortic valve stenosis
Hypovolaemia

21
Q

What can cause hypovolaemia?

A

Dehydration

Bleeding

22
Q

What is a weak pulse described as?

A

Thready

23
Q

What is a strong pulse described as?

A

A bounding pulse

24
Q

What can cause a bounding pulse?

A

Bradycardia

Low peripheral resistance

25
Q

How does bradycardia cause a bounding pulse?

A

Diastole has more time to occur
Increased diastolic run-off
Lower end-diastolic pressure
Widens pulse pressure

26
Q

What can cause low peripheral resistance?

A

Exercise

Pregnancy

27
Q

How does low peripheral resistance cause a bounding pulse?

A

Increased blood flow
Lower end diastolic volume, pressure
Widens pulse pressure

Cardiovascular System (22 decks)

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