Flashcards in Mutafova Deck (14)
What are hemodynamics?
physical principles governing the pressure, flow, resistance, & compliance of the cardiovascular system.
How would you describe the circuit of the circulatory system?
Closed circuit. This means that if there is a change in flow in one area of the body, it will be compensated for in another part of the body. Ex: increased skeletal muscle flow, decreased GI flow. End sum game.
Which parts of the circulatory system are in parallel circuit & which are in series?
Parallel: blood flow to skin or GI or urinary...
Does blood that flows thru kidney capillaries do it in series or in parallel?
It does it in series. Multiple capillaries.
T/F Vascular smooth muscle (unlike skeletal muscle) has some basal tone from intrinsic factors w/o neural input.
T/F Capillaries have only a very thin layer of smooth muscle in their tunica media.
False. They only have a layer of endothelial cells & a basement membrane.
What is the equation for the velocity of blood flow?
Where does the greatest drop in pressure come?
In the transition b/w the arterioles & the capillaries.
In Graves' disease, why do you see pulsatile flow at the level of the nail beds?
B/c of arteriolar vasodilation & reduced arteriolar resistance. Pulsatile flow isn't diminshed.
What are the pulse pressures like in patients with aortic regurgitation? Heart failure? Athletes?
Aortic Regurgitation: Large SV-->large PP
Heart Failure: Small SV-->small PP
Atheletes: Large SV-->large PP
What does the pulmonary wedge pressure estimate?
The LA pressure.
What happens to vascular compliance as you age?
Therefore, a given increase in volume, will correspond to a greater increase in pressure.
What is athersclerosis? Arteriosclerosis?
Athersclerosis: formation of multiple plaques w/i the arteries.
Arteriosclerosis: deposition of collagen around the atheroma...hardens the arterial wall.