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Prophylaxis of thromboembolism with various low-molecular-weight heparins.

In numerous clinical studies, the antithrombotic effect and tolerance of low-molecular-weight heparins (LMWHs) were compared to those of unfractionated heparin (UFH). Based on our own experience and on a review of the literature the following conclusions can be drawn. In the field of prophylaxis of thromboembolism, including high-risk patients with major bone surgery, the antithrombotic efficacy of a single daily dose of LMWH is at least equivalent to two or three injections of UFH per day. It should, however, be noted that the margin between thromboembolic and bleeding complications has not become bigger, although this had been derived from experimental results. In order to avoid bleeding complications, it is absolutely necessary to take note of the manufacturers' recommendations. This is particularly important when a change of various preparations is considered, because the standardization of LMWH preparations is different and the units are not comparable. The main advantage of LMWH results from an improved practicability. The single daily dose leads to an improved compliance of patients and the nursing staff is spared a great deal of work.