18 Questions
What does the R time measure in TEG parameters?
Time until clot starts forming
If the K time is extended in TEG parameters, what issue with coagulation factors might be indicated?
Fibrinogen is forming clot slowly
What does the Alpha angle in TEG parameters represent?
The angle of slope between R time and K time
If the lysis at 30 minutes (LY30) is high in TEG parameters, what might this indicate?
Clot is being lysed too much
What does the Maximum Amplitude (MA) measure in TEG parameters?
Platelets and fibrinogen
If the Alpha angle is shallow in TEG parameters, what might this indicate?
Fibrinogen forming clot slowly
What does the R time measure in TEG parameters?
Clot formation time
If the Lysis at 30 minutes (LY30) is high in TEG parameters, what might this indicate?
Excessive clot lysis
What does the K time measure in TEG parameters?
Clot formation time
What does Thromboelastography (TEG) measure?
Multiple components of the coagulation cascade
What might an extended R time, K time, and alpha angle in TEG parameters indicate?
Deficiency in coagulation factors and fibrinogen
What should be used to increase the amount of coagulation factors in a patient with an extended R time and K time in TEG parameters?
Fresh frozen plasma (FFP)
What is the difference between Thromboelastography (TEG) and prothrombin time (PT) or partial thromboplastin time (PTT) tests?
TEG is a dynamic test that measures multiple components of the coagulation cascade
What does the Maximum Amplitude (MA) measure in TEG parameters?
High amplitude clot achieves
If the Alpha angle is shallow in TEG parameters, what might this indicate?
Fibrinogen is forming clot slowly
What does the R time measure in TEG parameters?
Time until clot starts forming
What does the K time measure in TEG parameters?
Time until clot reaches amplitude of 20 mm
If the Lysis at 30 minutes (LY30) is high in TEG parameters, what might this indicate?
Clot is being lysed too much
Study Notes
TEG Parameters
- R time measures the time it takes for clotting to begin after blood is added to the TEG analyzer.
- An extended K time may indicate a problem with coagulation factors, such as a deficiency or abnormality.
Alpha Angle
- The Alpha angle represents the speed of clotting.
- A shallow Alpha angle may indicate a problem with clotting speed or strength.
Lysis at 30 minutes (LY30)
- A high LY30 may indicate a problem with clot break-down or increased fibrinolysis.
Maximum Amplitude (MA)
- MA measures the maximum strength of the clot.
Thromboelastography (TEG)
- TEG measures the viscoelastic properties of blood, including clotting time, strength, and stability.
- TEG provides a comprehensive picture of the coagulation process, unlike PT or PTT tests which only measure specific aspects.
Coagulation Factors
- An extended R time and K time may indicate a need for coagulation factors, such as fresh frozen plasma or cryoprecipitate, to increase the amount of coagulation factors in a patient.
Comparison with Other Tests
- TEG is different from PT or PTT tests, which only measure specific aspects of coagulation, whereas TEG provides a comprehensive picture of the coagulation process.
Abnormal Results
- An extended R time, K time, and alpha angle may indicate a problem with coagulation, such as a bleeding disorder or a need for coagulation factors.
Test your knowledge of Thromboelastography (TEG) parameters and their relationship to coagulation factors. This quiz covers R time, K time, and Alpha angle, and how their extension or shallowness can indicate issues with coagulation factors and clot formation.
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