这个词是什么意思？
Heparin fractions with a molecular weight usually between 4000 and 6000 kD. These low-molecular-weight fractions are effective antithrombotic agents. Their administration reduces the risk of hemorrhage, they have a longer half-life, and their platelet interactions are reduced in comparison to unfractionated heparin. They also provide an effective prophylaxis against postoperative major pulmonary embolism.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D006495 · MeSH 2026。
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