Transfusion and coagulation management in liver transplantation

Table 4 Parameters of viscoelastic tests - thromboelastography/rotational thromboelastometry

Parameter	TEG®	ROTEM®	Description
Clotting time	R	CT	Relates to concentration of soluble clotting factors in the plasma, the period of initial fibrin formation (time to reach 2 mm amplitude on the tracing)
Clot kinetics	K (K value) (min)	CFT	Measure the kinetics of clot formation
			Measures the speed to reach a specific level of clot strength (period for amplitude to increase from 2 to 20 mm)
	Alpha angle (angle in degrees) (°)	Alpha	Measures the rate of clot formation, reflects rate of fibrin build up and cross-linking (angle between a tangent to the tracing at 2 mm amplitude and the horizontal midline)
Clot strength	MA (mm)	MCF	Represents the ultimate strength of the clot (platelets and fibrin), maximum dynamic properties of fibrin and platelet bonding via GPIIb/IIIa receptors (greatest vertical width of tracing)
Clot stability	LY30	CLI	Relates to clot stability and lysis, measures the rate of amplitude reduction from MA at 30 min (in per cent)

TEG: Thromboelastography; ROTEM: Rotational thromboelastometry; R: Reaction time; CT: Clotting time; CFT: Clot formation time; MCF: Maximum clot firmness; CLI: Clot lysis index; MA: Maximum amplitude; MCF: Maximum clot firmness; LY30: Lysis at 30 min as a ratio of MA.