TEG Flashcards
(TEG) trace Thromboelastography is a
Viscoelastic hemostatic assay that measures global
properties of whole blood clot formation.
SP time definition and normal value range
Splitting time - start of trace till first deflection from 0 (first detectable fibrin)
R time definition
start of trace till 2mm total deviation
Delta time definition and normal value range.
What is the physiologic process which occurs during the delta segment?
R - SP = delta time (eg split of trace until 2mm deviation). Normal is (42-66s [0.7 - 1.1 min]).
Thrombin burst occurs here. Use this to compare TEG with TEG-H. Difference of greater than 2m between TeG and TEGH indicates heparin effect.
K time definition and normal value range
What physiologic coagulation process does this indicate?
Time interval between 2mm deviation until 20mm deviation. Normal 1-3 min kaolin activated.
Indicates fibrin cross-linkage and rate of bonding between fibrin and platelets. Also a measure of fibrinogen function.
Alpha angle definition and normal value range
the angle at which the curve rises from SP to K and is related directly to K time as a measure of fibrin platelet interaction and therefore functional fibrinogen (normal 59–74°)
MA
MA maximum ampliltude
ELY30
Estimated % lysis at 30min post MA (measured at 15m and predicts next 15)
LY30
Actual % lysis at 30min post MA
The K time is shortened by:
platelet function and increased fibrinogen level
The K time is lengthened by:
anticoagulants, thrombocytopenia, hypofibrinogenemia,
A30
Amplitude at 30m post-MA
one unit of FFP will decrease R time by ____)
2.5 min (give one unit FFP for every 2.5m prolonged)
Tx for decreased angle = _____
What is the dose?
cryoprecipitate (0.06 U/kg for angle <45 degrees)
Treat Decreased MA—____for slight decrease and ____ for more significant decrease
DDAVP ; platelets
