Viewing a single comment thread. View all comments

WebW3b OP t1_iy9fy7n wrote

Reply to comment by shaokim in Eli5, how do contracted Blood Vessels lead to Increased Cardiac Preload? by WebW3b

You’re correct but what I was asking/confused about in the post was about your first paragraph. I had trouble understanding how the vasoconstriction increases/keepsConstant preload (before getting overwhelmed)

It’s true that preload & BP ultimately decreases due to overwhelming blood loss, I just couldn’t comprehend the first part about how the body tries to maintain/increase the initial drop before the overwhelming fall

Your reply is immensely insightful and much appreciated!!

2

shaokim t1_iy9jasw wrote

This great page shows factors affecting central venous pressure.

It isn't the arterial vasoconstriction that affects preload, but venous vasoconstriction, that would also occur in the compensation by sympathetic factors (such as circulating adrenaline).

3

WebW3b OP t1_iyc4fxg wrote

This proves to be very useful, Lots of Thanks!

2