Please enable JavaScript.
Coggle requires JavaScript to display documents.
Free flap perfusion (Perfusion pressure (MAP - main determinant of the…
Free flap perfusion
Perfusion pressure
-
Transmural pressure is decreased by an increase in extravascular pressure (flap tissue does not have lymph drainage - oedema risk, haematoma, dressings, positioning)
-
Vessel radius
-
Vasodilation results in increased flow (anaesthesia and analgesia, normothermia)
Vasoconstriction reduces flow (hypothermia, hypovolaemia, SNS activation, resp alkalosis)
-
-
Fundamentals
Free flaps have their circulation detached and reanastamosed distantly and are thus vulnerable to ischaemia
Flow is laminar and can be described with Hagen Poiseulle equation: 
-