Haemodynamics Flashcards
What is whole unclothed blood called?
Plasma
What is serum?
Blood collected from clotted blood (clotting factors removed or used up)
How do you stop clotting to get plasma?
Add heparin to sample
What vessel type controls total peripheral resistance?
Arterioles
What is the comments cause of increased whole blood viscosity?
Multiple myeloma
What does blood do in the peripheries if it has increased viscosity?
Sludge
So think of haematological problems in peripheral ischaemia
How is blood viscosity a marker of inflammation?
Raised acute phase proteins can increase viscosity slightly. Things like CRP, complement and fibrinogen. So we often measure CRP as an inflammatory marker.
What is the difference between flow and velocity?
Flow is volume per unit times
Velocity is distance moved per unit time
Why would blood flow change from laminar to turbulent?
High Rate of Flow Passing through and obstructed vessel Sharp turns in a blood vessel Rough blood vessel surfaces Increased flow resistance
A bruit is …
is the noise from turbulent flow in a vessel
What is a thrill?
Vibration felt after blood flows through a stenosis is a thrill
What do you feel in a pulse?
The pressure difference (shock wave) in a vessel immediately before blood passes
Why would someone develop a bounding pulse?
A bounding pulse means a high pulse pressure. SO a big difference between sysBP and diasBP. Could be seen in bradycardia- longer diastole means lower diasBP.
What is turbulent flow?
Blood flowing in all directions in a vessel causing a continue mixing.
How do you calculate pulse pressure?
Systollic BP- Diastollic BP
