ABP Flashcards
Mention what is and what is the Function of arterial blood pressure ?
lateral pressure exerted by blood on the walls of BVS
F
Opening of the vessel \
driving force of blood to tissue
2 filtration filtration of blood to tissue at capillaries
filtration at the kideny
the blood pressure depend on ?
The Volume ?
NO Volume in relation to the diamtere ( compliance or distenability)
when bp constant ?
if amount of blood entering = leaving
this is not the case!
why bp is not constant in sys and dia
because only 1/3 of the blood of sv entering the vessel during systole leaves it to reach aretrioles
what is the resulut of that the the enrty is not equal what is leaving
SP =120 mm Hg 90-140
DP=80 mm Hg 60-90
المقصود اختلاف ضغط الدم خلال دورة القلب اثناء الانقباض والانبساط
اثناء الانقباض ودخول الدم للشرايين يكون الدم في اعلي ضعط له يوصل لمتوسط 120 بينما اثناء الانبساط يكون الدم مش بيدخل للشرايين ويعتمد تحرك الدم علي elastic recoil فهو هنا هيعدي لبقية vessel اثناء راحة القلب
MAP=
MAP=DP + 1/3PP=93 MM HG
90-100 NORMAL
The MAP is regulated by
blood pressure reflexes neither systole nor diastole
Why the arterial tree pressure is more or less the same ?
that is beacuse the small resistance in arterires compared to the arterioles and this lead to what ? leads to minimal or negligble amount of pressure lost so raidal art - unlar approximately
pulse pressure
SD-DP =40 MEAN !
30-50 NORMAL
Why is the pressure in femoral more than the brachial artey
it is because the effect of gravity !
increasing Bp below heart level than that of above it by 0.77 mm Hg for each 1cm
GR/ the SP IN abdominal aorta is higher than the ascending ?
that is because as you go peripherally the elasticity of the vessel decrease so the windkessel effect decrase and the systolic bp incrasse and diastoclic decrease
the windkessel pheomenon reprsents the storage of presser in the blood vessel in the shape of dilatation of the vessel this decrsases SP and it can be released during diastole by what is called elastic recoil and the increases the DP
why females during menopause have lower BP?
ESTROGEN!
Why children have less BP
because the vasmotor centre is not well developed so
increasing age – incresae the development of vasomotor tone and it sympathatic acitivty in vc of blood vessel incresaes the resistance and bp
Why is the bp changable during the intervals of the day
because during the morning you are still under parasymp eff after waking up
and during the afternoon the symp activitg take the upper hand !
during inspiration decrease the BP
during insp the intrathoracic pressure decrases and the vessels are dilated so the bp decresase
Emotions like anger
emotions like grief
effect on bp
1- increse symp
2-decrease parasymp
Excercise — iso tonic المشي والسباحة
isomertic رفع الاثقال
SPB increases at both
the DP decrases at isotoinc
and markedly increases during isometric
Static pressure MCP MSFP
Dynamic bp ?
1depends on blood volume in relation to the cirulatory capacity distensability
represnts the degree of filling of bv with blood 7-8 m during stoppage of circ
2 depends on the pumping force of the heart
detreminants of arterial BP mention
^P=F x R
MAP=COP x TPR
GR/ why the MAP increase during incresasr of HR although the pp decreased?
While increasing the HR the diastolic pressure increases breacuse the time of diatsole is shortened and then the pulse pressure decreses
but MAP= DP+ 1/3PP
The increase in the DP more than the decrese in the 1/3pp
Why the TPR affect mainly the DP?
Becausre it depends mainly on the resist in the arterioles when to which the blood reach the diastole has already begun so increase in the peripheral resistance affect mainly the DP and therefore MAP increase and then SP increase because of the increase of DP
الدم في الانقباض هينضم لدم اصلا ضغطه عال فهيعلي عليه !
TPR is the 2nd effector of the ABP ?
that is because it controls the outflow of blood to the capillary
يزود الدياستول و ال ماب و السيستول
العامل الاهم المؤثر علي المقاومة الطرفية الكلية هو ؟
مساحة مقطع الوعاء الدموي
a small change in the radius cause a great effect on the the TPR
because it is related to the radius to the power 4
العامل الاهم المؤثر علي المقاومة الطرفية الكلية هو ؟
مساحة مقطع الوعاء الدموي
a small change in the radius cause a great effect on the the TPR
because it is related to the radius to the power 4!
Total blood volume in relation to the capacity of blood vessel
mention its effect on the ABP
لو زادت كمية الدم بالنسبة للمساحة اللي ماشي فيها هيؤدي ذلك الي شوية زيادة الرجوع الوريدي و زيادة ملء القلب وزيادة المخرج القلبي وبالتالي زيادة الضغط الدموي والعكس صحيح
Elasticity affect the pp GR .
Because according to windkessel phenomenon
the bv store some of the systolic pressure as dilatation preventing
incerase in sp
and decresa in dp
and incerar in pp
atherosclerosis increases PP
because this affect the elasticity and this leads to high SP
LOW DP and higher PP
Determinant of ABP
MAP =CO X TPR
TOTAL BLOOD VOLUME AND CAPACITY OF BLOOD VESSELS
ELASTICITY !
MAIN DETERMINANTS OF SP
SV
ELASTICITY IN AORTA AND BIG ARTERIES
MAIN DETERMINANTS OF DP
TPR
ELASTICITY \
HEART RATEEEEE
pHYSIOLOGICAL FACTORS ON ABP
SEB ASD STRESS EXERCISE BODY POSITION AGE SED DIURENAL AND NOCTURNAL VARIATION
The arterioles are the most effector on the TPR
BECAUSE THEIR DIAMETER IS ABLE TO BE CHANGE EASILHY BY NEURAL OR HORMONAL EFFECTS
Detrminant of pp
The sv
elasticity
the aortic incometence ivcrease pp why?
because this lead to drop of DP as blood flow back to the ventricle
