ATTENTION GUYS PLZZZ !!! how does the⬆ in HR ( heart rate) leads to increase in Diastolic pressure .. while it doesn't affect the Systolic pressure although its increase results in increase of CO which affect Systolic pressure !! I need an explanation !!!
first of all the main determinant of systolic Bp is Sv while main determinant of diastolic Bp is TPR and HR . increased HR decreases diastolic timethe time during which heart fills which decreases SV and CO .But increased HR increases DBP as it decreases diastolic time =decreased amount if bliod in heart during diastole and this blood remains in blood vessels in diastole
Increase in HR doesn’t decrease the CO, only decreases SV. CO (ml/min) = SV x ‘HR’.
No .. it is not .. Increase HR just increase Diastolic pre. And not both .. you gotta correct ur information !
Inc hR inc pvs than inc diastolic than inc stroke vol inc systolic bp
HR increases if there is activation of sympathetic nervous sys., which also increases the total peripheral resistance resulting in an increase in Diastolic B.P.. however I’m not sure if it doesn’t affect Systolic pressure, as BP= ‘CO’ x TPR However I would like to ask you about the source of information so that I can find out how this happens. Cause if what you asked is the case then I’m pretty confused!
Well from what I understand (I’m not sure if this is entirely correct)CO is function of both HR and SV. But inc in HR results in dec. in SV, hence the net effect on Sys. BP in reduced, however effect of HR on diastolic BP would be pronounced as per the explanation given by Esraa Melegiey in the above comment. So inc in hr increases the Dias BP but has no effect on Syst. BP even though it causes an increase in CO. Then again this is my understanding, not sure to what extent it is correct!
First thing first thanks for your attention !! Okay .. actually from alot of sources which share the same idea !! .. in my collage I studied that the cardiac output affect systolic pre. more than diastolic while changes in TPR affect the diastolic more than systolic .. as I watched doctors in the YouTube say the same information that I got it from my college but in a bit different way !! .. they say that .. Diastolic pre. is affected primarily by TPR and also by increase in HR .. on the other hand the systolic pre. is affected primarily by Stroke Volume and increased also by sclerosis .. If you get me plz help me to understand what I misunderstand in my question above!
First know the exact definitions!!! Systolic pressure is the max pressure when the heart beats and diastolic pressure is the pressure value IN THE ARTERIES between two heartbeats.this is the clinical defnition of these two terms. Come in that way. Peak value of pressure won't change without critical complications. The blood vessel pressure mechanism functions and dilate the blood vessels. Refer my comment on your previous post regarding the proportionality relationship between CO and BP. BP is simply systolic pressure. Now I think u can clarify it!
Moreover HB is measured in number unit and CO is meadured in volume unit!! Don't confuse with both terms!
