Control of arterial pressure 1 Flashcards
blood pressure
outwards hydrostatic pressur exerted by the blood on blood vessel walls
pulse pressure
difference between systolic and diastolic
when is the first koroktoff sound heard
at peak systolic pressure
when is the last koroktoff sound heard
at minimum diastolic ; muffled/muted
why is no sound heard after
because of smooth uninterrupted laminar flow
when is diastolic pressure recorded
at the fifth koroktoff sound as its the point at which the sound disappears
MAP
Average arterial blood pressure during a single cardiac sound
map calc
2x diastolc + systolic/ 3
dbp + 1/3rd pulse pressure
why msut MAP be regulated
high enoguh to perfuse vital organd and not too high to damage blood vessels
MAP calc assoc
co x svr
what are the mjaor resistance vessels
arterioles
effect of suddenly standing up
venous return to heart decraeses
map decraeses
reduced rate of firing of baroreceptors
vagal tone decraeses
sympa increases
hr increases, sv increases
svr increases
result of standing up
rapid correction of the transient fall in map
postural hypotension
Results from failure of Baroreceptor responses to gravitational shifts in blood, when moving from horizontal to vertical position
positive result in hypotension
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)
