Hamostaseologie
-
In the diagnosis of deep vein thrombosis in ambulatory patients, the recommended initial steps are assessment of clinical probability (CP) and a sensitive D-dimer test. With a low CP and negative D-dimer, thrombosis can be ruled out. All other constellations require further investigation with imaging techniques. ⋯ Secondary prophylaxis with a vitamin K antagonist is introduced in parallel as quickly as possible. The duration of treatment depends on the exposure and predisposing factors, weighing carefully the risk of recurrence on the one hand against the risk of bleeding on the other. The danger of a post thrombotic syndrome is reduced by the immediate begin of a long lasting compression therapy.
-
Managing perioperative haemostasis starts with the diligently taken patient history. Unfortunately, classic global tests such as the PT and aPTT have no predictive value with regard to an acquired intra- or postoperative bleeding diathesis. However, new assays for preoperative risk stratification are in clinical development. ⋯ A predefined validated algorithm reduces the need for blood products. To establish an evidence based approach for the use of blood components and other procoagulants in such a situation requires prospective clinical trials. The actual knowledge on the pathophysiology of such incidents (e. g. cross linking defects by use of colloids, dilutional effects of volume therapy, repeated use of FFP, of antifibrinolytics, frequency of unwanted effects) should also be considered.