Ethanol extract of the mixture of Ligusticum wallichii and Angelica acutiloba exerts significant anticoagulant effect on human blood in in vitro experiments. At concentration of 1:25 in the serum, the extract prolongs the prothrombin, thromboplastin and thrombin times, thus inhibits all the three steps of the coagulation process, i.e, the exogenous, the endogenous precoagulation steps and the formation of fibrins. Finally, at concentration of 1:50 in the serum, the mixture significantly reduces theplatelet aggregation blocking the clotting process.
Anticoagulants ; Blood ; Biochemistry

We inserted the 0.6 mm caliber graft-heparin (in inner wall) conduits into the tailarteries of 14 mice. The results showed that the graft conduit could be used repeatedly with no blood oozing out in the wound, no massive internal hemorrhage, and no additional coagulative reagent given during the whole experiment. On the other hand, the graft-heparin conduits of variant caliber were inserted into the femur arteries of 4 rabbits and 4 dogs for blood pressure experiment and femur arterio-venous bypass tests. The results showed that the anticoagulative effect of these conduits was markedly improved, but there was a strip of thrombus. There was no thrombus track in the wall of the conduit. The strip of thrombus was formed first in the cone of conduit where caliber changed. The results indicate that the blood flow resistance is in inverse proportion to 4 power of the conduit radius. So the thinner the conduit is, the more sensitive to conduit radius variation the conduit resistance will be. In studying and making the arfificial conduit, one must take notice of the conduit caliber, which should be equal to the caliber of the blood vessel.
Animals ; Anticoagulants ; administration & dosage ; Blood Vessel Prosthesis ; Dogs ; Heparin ; administration & dosage ; Mice ; Rabbits ; Regional Blood Flow

OBJECTIVE: To discuss blood collection tubes with different additives and their effects on the testing results of alcohol concentration in blood samples. METHODS: Blood samples from 10 volunteers were collected 2 hours after drinking with seven different types of disposable vacuum blood collection tubes, including ordinary tube without anticoagulant, coagulant tube, separating gel-coagulant tube, sodium citrate (1:4) tube, sodium citrate (1:9) tube, sodium citrate (9:1) tube and EDTA-K2 tube. The alcohol concentrations in these blood samples were analyzed by headspace gas chromatography. RESULTS: The concentration testing results of the same blood samples in different types of tubes were different from one to another. The sequence was as follows: separating gel-coagulant tube > coagulant tube > ordi- nary tube without anticoagulant > EDTA-K2 tube> sodium citrate (1:9) tube> sodium citrate (1:4) tube, whereas the results of the same blood sample in sodium citrate (1:9) tube and sodium citrate (9:1) tube showed no obvious difference. CONCLUSION It is better to collect a suspicious drunk driver's blood sam- ple using a disposable vacuum blood collection tube, with the EDTA-K2 tube being preferred.
Anticoagulants ; Blood Specimen Collection/methods* ; Citrates ; Ethanol/blood* ; Humans ; Sodium Citrate

PURPOSE: To assess the efficacy and safety of autologous transfusion of filtered shed blood in total knee arthroplasty (TKA). MATERIALS AND METHODS: A total of 42 patients with TKA (group A; without autologous transfusion in 15 patients, group B; with autologous transfusion in 27 patients) were evaluated retrospectively. The influence of autologous reinfusion of filtered blood, bleeding tendency, amount of blood drainage, rate of allogenic transfusion, and the postoperative changes of hemoglobin were analyzed. RESULTS: Allogenic transfusion was needed in 26.7% (4/15) of group A and none of group B till postoperative 48 hours. Till postoperative 14 days, 46.7% (7/15) of group A needed allogenic transfusion while 7.4% (2/27) in group B. The average drained blood volume was 1,197+/-400 mL in group A and 975+/-422 mL in group B. The average decrease of hemoglobin at postoperative 1, 7, and 14 days was 2.9+/-1.5, 2.9+/-1.6, and 2.3+/-1.5 g/dL respectively in group A and 2.7+/-0.8, 4.0+/-1.0, and 2.9+/-1.3 g/dL respectively in group B. CONCLUSIONS: An autotransfusion system lowered the allogenic transfusion rate, while anticoagulants did not increase the amount of drained blood. An autotransfusion system with anticoagulants was effective and safe to save the shed blood in TKA.
Anticoagulants ; Arthroplasty ; Blood Transfusion, Autologous ; Blood Volume ; Drainage ; Hemoglobins ; Hemorrhage ; Humans ; Knee ; Retrospective Studies

BACKGROUND: The administration of low dose heparin and dextran therapy in patients with arterial bypass surgery is thought to prevent thrombosis and graft occlusion. The purpose of this study was to evaluate the effectiveness of low dose heparin and dextran in atherosclerosis patients presenting hypercoagulability. METHODS: Whole blood coagulation was evaluated using thrombelastography and standard coagulation testing before and a day after surgery in nine atherosclerotic patients and nine control patients. Heparin 5000 U and dextran 500 ml were administrated in atherosclerotic patients during their operations. RESULTS: Atherosclerotic patients showed higher maximal amplitude compared to the control patients during preoperative thrombelastography. After surgery atherosclerotic patients revealed no significant change, but the control group became more hypercoagulable in status compared to the preoperative period. CONCLUSIONS: Intravenous heparin and dextran prevented postoperative change to a more hypercoagulable state than the preoperative status in atherosclerotic patients undergoing arterial bypass surgery.
Anticoagulants ; Arteriosclerosis Obliterans* ; Arteriosclerosis* ; Atherosclerosis ; Blood Coagulation ; Dextrans* ; Heparin* ; Humans ; Preoperative Period ; Thrombelastography ; Thrombophilia ; Thrombosis ; Transplants

Pseudothrombocytopenia is usually associated with anticoagulant ethylene diaminetetraacetic acid (EDTA). The platelet clumping that occurs in EDTA-dependent pseudothrombocytopenia (EDPT) can sometimes be prevented by the use of other anticoagulants such as heparin or sodium citrate. As an alternative, we used kanamycin before or after the withdrawal of EDTA-anticoagulated blood in a 6-year-old boy with EDPT. Kanamycin used supplementarily during the differentiation of EDPT effectively prevented platelet clumping.
Anticoagulants ; Blood Platelets* ; Child ; Citric Acid ; Edetic Acid ; Heparin ; Humans ; Kanamycin* ; Male ; Platelet Aggregation* ; Sodium

Anticoagulants ; adverse effects ; pharmacology ; Blood Coagulation Disorders ; chemically induced ; Drug Interactions ; Humans ; Warfarin ; adverse effects ; pharmacology

PURPOSE: We underwent this study to evaluate the factors which influence labeling efifciency when modified in vivo erythrocyte labeling technique was used. MATERIALS AND METHODS: Thirty healthy volunteers (M: F=19: 11, age: 25 +/- 2 yrs) were enrolled in this study. Totally, two hundred ten samples were obtained from them. The 1 mg of stannous pyrophosphate was injected intravenously at the beginning of labeling. After suitable tinning time (5 min, 20 min, 35 min) passed by, blood (5 mL, 3 mL or 1 mL) was withdrawn into 10 mL syringe previously containing Tc-99m (740 MBq) and anticoagulant (heparin, ACD or CPDA) through 19-gauged scalp needle. The generator ingrowth time of Tc-99m was within 24 hrs in each case. The blood samples were placed on rotating invertor during incubation (10 min, 25 min, 40 min) but some of them were not. Immediately after the conclusion of incubation, the labeled blood specimens to analyze were centrifuged. and then %Unbound Tc-99m was calculated. Statical analysis was used paired T-test and one way ANOVA with SPSS 10.0. RESULTS: The binding efficiency at 1 mL of blood volume was 73 +/- 32%, 91 +/- 10% at 3 mL and 96 +/- 7% at 5 mL (p< 0.01). The binding efficiency at 5 min of tinning time was 45 +/- 23%, 98 +/- 6% at 20 min and 97 +/- 8% at 35 min (p< 0.001). The binding efficiency at 10 min of incubation time was 96 +/- 7%, 95 +/- 12% at 25 min and 98 +/- 3% at 40 min (p> 0.05). The binding efficiency in case of using rotating invertor was 96 +/- 7% and the binding efficiency in case of not using it was 87 +/- 18% (p> 0.05). There was no significant difference between them. In binding efficiency according to kinds of anticoagulants, ACD was 98 +/- 4%, CPDA was 97 +/- 6% and heparin was 89 +/- 20% (p< 0.001). CONCLUSION: When modified in vivo erythrocyte labeling technique is used with Tc-99m, the methods to obtain the highest labeling efficiency are as follow. The withdrawing blood volume should be over 3 mL, tinning time should be kept between 20 min and 35 min, and incubation time should be kept between 10 min and 40 min. ACD or CPDA have to be used as a anticoagulant except heparin and the blood samples should be placed on rotating invertor during incubation.
Anticoagulants ; Blood Volume ; Erythrocytes* ; Healthy Volunteers ; Heparin ; Needles ; Scalp ; Syringes ; Tin

The causes of ischemic stroke are widely diverse, ranging from large artery atherosclerosis to cardioembolism, and it is important to use preventive therapy toward the goal reducing the future risk of recurrent ischemic stroke, myocardial infarction, and vascular death. Antithrombotic therapy is one of the fundamental medical approaches for secondary prevention of ischemic stroke, which is broadly divided into two general categories, those that exert their effect via platelet inhibition (antiplatelet agents), and those that influence various factors in the clotting cascade (anticoagulants). In general, the clinical guidelines recommend antiplatelet agents for patients with non-cardioembolic stroke, while anticoagulants is indicated for patients with presumed or proven cardioembolic stroke. Many clinical trials have attempted to test the efficacy and safety of antithrombotics in ischemic stroke. This review will discuss on currently available antithrombotic agents that have demonstrated efficacy for secondary prevention of ischemic stroke.
Anticoagulants ; Arteries ; Atherosclerosis ; Blood Platelets ; Fibrinolytic Agents ; Humans ; Myocardial Infarction ; Platelet Aggregation Inhibitors ; Secondary Prevention* ; Stroke*

BACKGROUND: The identification of in vitro hemolysis (IVH) using a hematology analyzer is challenging because centrifugation of the specimens cannot be performed for cell counts. In the present study, we aimed to develop a scoring system to help identify the presence of hemolysis in anticoagulated blood specimens. METHODS: Thirty-seven potassium EDTA anticoagulated blood specimens were obtained, and each specimen was divided into 3 aliquots (A, B, and C). Aliquots B and C were mechanically hemolyzed by aspirating 2 and 5 times, respectively, using a 27-gauge needle and then tested; aliquot A was analyzed immediately without any hemolysis. After the cells were counted, aliquots B and C were centrifuged and the supernatants were tested for the hemolytic index and lactate dehydrogenase levels. RESULTS: The 4 hematologic parameters were selected and scored from 0 to 3 as follows:< 34.0, 34.0-36.2, 36.3-38.4, and > or =38.5 for mean cell hemoglobin concentration (MCHC, g/dL); <0.02, 0.02, 0.03, and > or =0.04 for red blood cell ghosts (10(12)/L); <0.13, 0.13-0.38, 0.39-1.30, and > or =1.31 for difference value (g/dL) of measured hemoglobin and calculated hemoglobin; and <0.26, 0.26-0.95, 0.96-3.34, and > or =3.35 for difference value (g/dL) of MCHC and cell hemoglobin concentration mean. The hemolysis score was calculated by adding all the scores from the 4 parameters. At the cutoff hemolysis score of 3, the IVH of aliquots B and C were detected as 64.9% and 91.9%, respectively. CONCLUSIONS: The scoring system might provide effective screening for detecting spurious IVH.
Anticoagulants/*pharmacology ; *Blood Specimen Collection ; Edetic Acid/pharmacology ; Hemoglobins/analysis ; Hemolysis/drug effects ; Humans