Blood Pressure Flashcards

1
Q

How is MAP estimated

usually roughly 100mmHg

A

Area under curve of pressure (look at cardiac cycle diagram)

The diastolic pressure + 1/3 pulse pressure

pulse pressure is systolic minus diastolic pressure

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2
Q

What determines MABP?

A

Cardiac output x TPR

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3
Q

What are the short term regulators of MABP?

A

Nervous activity mainly so effects of vasoconstriction and vasodilation, as well as effects on the heart so inotropy aletring SV and HR being altered

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4
Q

What regulates MABP in the long term

A

Fluid control by the kidneys, affecting CO mainly, not TPR

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5
Q

What influences aortic pulse pressure

A

Systolic: Stroke volume; aortic compliance
Diastolic: aortic compliance; run off from aorta ( TPR and heart rate)

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6
Q

How does compliance of blood vessels (namely the aorta) alter with age

A

It decreases, so as the vessel becomes more filled with collagen (more stiff), for a given volume the change of pressure is larger. Thus pulse pressure will increase (increase in systolic pressure)

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7
Q

How does TPR alter diastolic pressure

A

If you increase TPR, there is a less rapid run off, thus increasing diastolic pressure. vice versa. This will decrease the pulse pressure

Increased heart rate means higher diastolic pressure- less time for run off

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