Related Experiment Video
Updated: May 1, 2026
13:08
Measurement of Factor V Activity in Human Plasma Using a Microplate Coagulation Assay
Published on: September 9, 2012
19.9K
Dose-dependent Effects of Four-factor Prothrombin Complex Concentrate on Clotting Time in Rotational
Stanislaw Vander Zwaag1, Kinga Towarek-Nocon2, Imre Kukel1
1Institute of Cardiac Anesthesiology, Medical Faculty and Heart Center, TUD Dresden University of Technology, Dresden, Germany.
Journal of Cardiothoracic and Vascular Anesthesia
|April 29, 2026
Summary
Four-factor prothrombin complex concentrate (PCC) dosing showed inconsistent reductions in clotting time after cardiac surgery. EXTEM-CT did not reliably predict severe bleeding, suggesting PCC should not be escalated based solely on this measure.
Area of Science:
- Cardiology
- Anesthesiology
- Hematology
Background:
- Cardiac surgery patients often experience coagulopathy.
- Prothrombin complex concentrate (PCC) is used to manage bleeding.
- Viscoelastic testing, like rotational thromboelastometry (ROTEM), guides hemostatic therapy.
Purpose of the Study:
- To assess if four-factor PCC dosing predictably reduces EXTEM clotting time (CT).
- To evaluate EXTEM-CT's ability to predict severe postoperative bleeding after cardiac surgery.
Main Methods:
- Retrospective cohort study at a tertiary academic cardiac center.
- 175 adult patients undergoing cardiac/aortic surgery received a single PCC dose.
- Rotational thromboelastometry (ROTEM) measured EXTEM-CT before and after PCC administration.
Main Results:
- Median EXTEM-CT decreased from 104 to 76 seconds post-PCC.
- On-pump EXTEM-CT strongly predicted clotting time reduction (p < 0.001).
- PCC dose had a modest, non-significant effect on clotting time reduction (p = 0.14); EXTEM-CT poorly predicted severe bleeding (AUC = 0.486).
Conclusions:
- Weight-based PCC dosing provides inconsistent reductions in ROTEM-measured CT in cardiac surgery.
- EXTEM-CT is an unreliable predictor of severe postoperative bleeding.
- PCC dosing escalation should not rely solely on EXTEM-CT prolongation.
More Related Videos
Related Concept Videos
01:29Venous Thrombosis III: Interprofessional Care
482
Venous thrombosis requires effective prevention and treatment strategies to improve patient outcomes and reduce potential complications.Prevention StrategiesHealthcare providers must prioritize preventing venous thromboembolism (VTE) for all adult patients upon admission. Interventions depend on bleeding and thrombosis risk, medical history, current medications, diagnoses, planned procedures, and patient preferences. Patients on bed rest should change positions every two hours and, if not...
482
01:18Anticoagulant Drugs: Vitamin K Antagonists and Direct Oral Anticoagulants
2.7K
Oral anticoagulants are vital tools in preventing and treating blood clotting disorders. This diverse class of medications can be categorized as vitamin K antagonists, exemplified by warfarin, and direct thrombin inhibitors (DTIs), such as dabigatran, as well as factor Xa inhibitors, including rivaroxaban.
Warfarin, a prominent vitamin K antagonist family member, exerts its effect by inhibiting the enzyme VKORC1 (vitamin K epoxide reductase complex 1). By hindering this enzyme, warfarin...
Warfarin, a prominent vitamin K antagonist family member, exerts its effect by inhibiting the enzyme VKORC1 (vitamin K epoxide reductase complex 1). By hindering this enzyme, warfarin...
2.7K
01:30Anticoagulant Drugs: Low-Molecular-Weight Heparins
2.6K
Hemostasis is a crucial process that prevents excessive blood loss from damaged blood vessels. It involves various mechanisms such as vasoconstriction, platelet adhesion and activation, and fibrin formation. The importance of each mechanism depends on the type of vessel injury. In contrast, thrombosis is the abnormal formation of a blood clot within the blood vessels, leading to potential complications if the clot obstructs blood flow. Thrombosis can be caused by increased coagulability of the...
2.6K
01:14Time Course of Drug Effect
2.6K
The progression of a drug's impact can be analyzed by examining both the concentration-time course and the effect-time course. The concentration-time course is determined by the drug's half-life and is influenced by factors such as its pharmacokinetics, including absorption, distribution, metabolism, and elimination. The effect of the drug is often related to its concentration in the plasma and is calculated using the maximum drug effect and the plasma concentration that generates 50...
2.6K
01:15Drug Concentration Versus Time Correlation
3.0K
The plasma drug concentration-time curve is a crucial tool in pharmacokinetics, representing the drug's concentration in plasma at different time intervals post-administration. This curve illustrates the drug's journey from absorption into the systemic circulation, distribution to body tissues, and eventual elimination through excretion or biotransformation.
Two pivotal parameters are the minimum effective concentration (MEC) and the minimum toxic concentration (MTC). The MEC is the...
Two pivotal parameters are the minimum effective concentration (MEC) and the minimum toxic concentration (MTC). The MEC is the...
3.0K
01:14Pharmacokinetic–Pharmacodynamic Relationship: Duration of Dose-Effect Relationship
124
For drugs producing a quantal response, onset occurs when plasma concentration reaches a minimum effective level (Cmin). The drug's action duration depends on how long the plasma concentration remains above Cmin.Two primary factors influence this duration: dose size and the rate of drug removal from the action site. Both depend on the drug's redistribution to poorly perfused tissues and elimination processes. A larger dose promotes rapid onset and prolongs the effect's duration.Consider a...
124