PMID- 9058500 OWN - NLM STAT- MEDLINE DCOM- 19970520 LR - 20190727 IS - 0049-3848 (Print) IS - 0049-3848 (Linking) VI - 85 IP - 3 DP - 1997 Feb 1 TI - Very low doses of unfractionated heparin potentiate the anti-Xa activity of low molecular weight heparin (enoxaparin). PG - 259-65 AB - Some previous reports indicated that a minimal amount of anti-IIa is necessary for the optimal anti-Xa activity of low molecular weight heparin (LMW-H). To know if we could improve the prophylactic activity of LMW-H, providing a mild antithrombin effect, we conducted an experiment in which we administered subcutaneously to 10 volunteers, very low doses of unfractionated heparin (UFH), (1000 IU), a LMW-H (enoxaparin, 2000 IU = 20mg), or both heparins together on alternate days, and measure the anti-Xa activity before, and 4 hours after injection. We found that the anti-Xa activity in the first group (UFH), increased by 33%, over the basal values; in the second group (LMW-H), by 93%, but it increased by 282%, in the third group (UFH + LMW-H) showing clearly (p < 0.0069), that UFH could increase synergistically, more than additive, the anti-Xa activity of enoxaparin. The impact on the cost-effectiveness of antithrombotic prophylaxis and the therapeutic results with the herein combined scheme should be evaluated. FAU - Perez-Requejo, J L AU - Perez-Requejo JL AD - Centro Policlinico Valencia, Venezuela. FAU - Lucena-Solano, O AU - Lucena-Solano O FAU - Perez-Garcia, M AU - Perez-Garcia M FAU - Santarelli, M T AU - Santarelli MT LA - eng PT - Journal Article PL - United States TA - Thromb Res JT - Thrombosis research JID - 0326377 RN - 0 (Anticoagulants) RN - 0 (Factor Xa Inhibitors) RN - 0 (Heparin, Low-Molecular-Weight) RN - 9005-49-6 (Heparin) SB - IM EIN - Thromb Res 1997 Jul 15;87(2):269 MH - Anticoagulants/*pharmacology MH - Drug Synergism MH - *Factor Xa Inhibitors MH - Heparin/*pharmacology MH - Heparin, Low-Molecular-Weight/*pharmacology MH - Humans EDAT- 1997/02/01 00:00 MHDA- 1997/02/01 00:01 CRDT- 1997/02/01 00:00 PHST- 1997/02/01 00:00 [pubmed] PHST- 1997/02/01 00:01 [medline] PHST- 1997/02/01 00:00 [entrez] AID - S0049-3848(97)00010-8 [pii] AID - 10.1016/s0049-3848(97)00010-8 [doi] PST - ppublish SO - Thromb Res. 1997 Feb 1;85(3):259-65. doi: 10.1016/s0049-3848(97)00010-8.