Control of arterial pressure 1 Flashcards

1
Q

blood pressure

A

outwards hydrostatic pressur exerted by the blood on blood vessel walls

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2
Q

pulse pressure

A

difference between systolic and diastolic

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3
Q

when is the first koroktoff sound heard

A

at peak systolic pressure

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4
Q

when is the last koroktoff sound heard

A

at minimum diastolic ; muffled/muted

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5
Q

why is no sound heard after

A

because of smooth uninterrupted laminar flow

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6
Q

when is diastolic pressure recorded

A

at the fifth koroktoff sound as its the point at which the sound disappears

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7
Q

MAP

A

Average arterial blood pressure during a single cardiac sound

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8
Q

map calc

A

2x diastolc + systolic/ 3
dbp + 1/3rd pulse pressure

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9
Q

why msut MAP be regulated

A

high enoguh to perfuse vital organd and not too high to damage blood vessels

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10
Q

MAP calc assoc

A

co x svr

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11
Q

what are the mjaor resistance vessels

A

arterioles

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12
Q

effect of suddenly standing up

A

venous return to heart decraeses
map decraeses
reduced rate of firing of baroreceptors
vagal tone decraeses
sympa increases
hr increases, sv increases
svr increases

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13
Q

result of standing up

A

rapid correction of the transient fall in map

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14
Q

postural hypotension

A

Results from failure of Baroreceptor responses to gravitational shifts in blood, when moving from horizontal to vertical position

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15
Q

positive result in hypotension

A

A positive result is indicated by a drop, within 3 minutes of standing from lying position:
in systolic blood pressure of at least 20 mmHg (with or without symptoms) or
a drop in diastolic blood pressure of at least 10 mm Hg (with symptoms)

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16
Q

what do barorecpetors only respond to

A

acute changes in blood pressure

17
Q

when is baroreceptor firing decraesed

A

if high blood pressure is sustained