UNLABELLED Clot waveform analysis extends the interpretation of aPTT measurement curves. The curve is mathematically processed to obtain information about fibrin formation kinetics including semiquantitative determination of thrombin, prothrombinase and tenase activity. PATIENTS, METHOD In this study the feasibility of clot waveform analysis for monitoring of haemophilia A was investigated us...

We report a patient with tetralogy of Fallot who developed spontaneous bilateral perirenal hematoma at the age of 35. Polycythemia was seen from the age of 3 in this patient. Prolonged clotting time and partial thromboplastin time were observed on various occasions before he developed perirenal hematoma. Blood letting was done periodically according to the value of hemoglobin level and packed c...

Unfractionated heparin (UFH) has been in clinical use for more than half a century. Despite its undoubted contribution to the treatment and prevention of thrombosis, heparin is significantly limited by its variable biochemical composition and unpredictable pharmacokinetics. The situation is compounded by the fact that methods for monitoring heparin do not necessarily reflect its therapeutic eff...

BACKGROUND In 1996, a weight-based protocol for administration of heparin was implemented and assessed at the authors' institution. Since then, several modifications have been made, including introduction of a lower-target protocol. These changes warranted re-evaluation of the standard and lower-target protocols. OBJECTIVE To determine and compare the efficacy and safety of the standard and l...

Our aim was to determine the quantitative effects of a single-dose of Nattokinase (NK) administration on coagulation/fibrinolysis parameters comprehensively in healthy male subjects. A double-blind, placebo-controlled cross-over NK intervention study was carried out in 12 healthy young males. Following the baseline blood draw, each subject was randomized to receive either a single-dose of 2,000...

Acquired inhibitors to factor VIII (FVIII) are rare, but life-threatening in up to 22% of cases. The optimal therapy for suppression of these inhibitors remains unclear. Prednisolone is the mainstay of therapy, producing responses in approximately 30% of cases. Intravenous immunoglobulin (IVIg) has a similar response rate, but a more rapid effect. We report the results of prednisolone 1 mg kg(-...

We investigated the possibility that samples of blood could be contaminated by heparinized blood gas syringes, giving spurious results in coagulation tests. We collected coagulation test samples before (n=5) and after (n=13) blood gas sampling from a venous cannula in a volunteer. The results of activated partial thromboplastin time (APTT) tests were compared between control samples and samples...

The effects of argatroban, a direct thrombin inhibitor, on the International Normalized Ratio (INR), activated partial thromboplastin time (aPTT) and functional factor X during warfarin co-administration were established to provide means to interpret INRs during argatroban/warfarin co-therapy. Twenty-four subjects receiving warfarin (7.5 mg, day 1; 3-6 mg/day, days 2-10) and argatroban (1-4 mic...

The course and treatment of a life-threatening hemorrhagic episode in a patient with hemophilia A whose plasma contained a high concentration of an inhibitor of factor VIII activity is presented. The inhibitor of factor VIII was localized to the most anodal fractions of immunoglobulin G on electrophoresis, and was thus presumed to be an antibody directed against factor VIII. No therapeutic bene...

INTRODUCTION The Clinical and Laboratory Standards Institute (CLSI) has produced a guideline detailing how to determine the activated partial thromboplastin time's (APTT) sensitivity to clotting factor deficiencies, by mixing normal and deficient plasmas. Using the guideline, we determined the factor sensitivity of two APTT reagents. METHODS APTTs were performed using Actin FS and Actin FSL o...