Heparin, Low-Molecular-WeightDalteparinNadroparinAnticoagulantsEnoxaparinHeparinMolecular WeightFactor XaHeparin AntagonistsThrombin TimeVenous ThrombosisVenous ThromboembolismHeparin LyasePartial Thromboplastin TimeBlood CoagulationInjections, SubcutaneousFibrinolytic AgentsAntithrombinsHemorrhageThromboembolismThrombophlebitisPulmonary EmbolismAntithrombin IIIThrombosisAntithrombin ProteinsBody WeightAcenocoumarolPolysaccharidesFactor IXaWarfarinDermatan SulfateThrombinAngina, UnstableThrombophiliaWeight LossTreatment OutcomeWeight GainBandagesGlycosaminoglycansHirudinsAspirinThrombocytopeniaStockings, CompressionWhole Blood Coagulation TimeBlood Coagulation TestsPlatelet Aggregation InhibitorsDose-Response Relationship, DrugPostoperative ComplicationsAlloysProthrombin TimeDextransPregnancy Complications, CardiovascularKineticsTime FactorsProspective StudiesHeparitin SulfateOrthopedicsCapsulesFibrin Fibrinogen Degradation ProductsProthrombinFibrinHeparin Cofactor IIAntiphospholipid SyndromeBlood Loss, SurgicalAdministration, CutaneousBirth WeightHeart Valve ProlapseElectrophoresis, Polyacrylamide GelOligosaccharidesRecurrenceProtaminesChromatography, GelPregnancyDouble-Blind MethodDrug Therapy, CombinationGelatinParticle SizePlatelet Glycoprotein GPIIb-IIIa ComplexAcute DiseaseAdministration, OralNeoplasmsMyocardial InfarctionRandom AllocationProtein BindingPlacebosInfusions, IntravenousRandomized Controlled Trials as TopicAmino AcidsPlatelet AggregationThrombolytic TherapyBlood PlateletsAmino Acid SequenceRisk FactorsPregnancy OutcomeDrug Administration ScheduleMolecular Sequence DataRats, Sprague-DawleyDisease Models, AnimalRisk AssessmentFollow-Up Studies