Abstract
Hypersensitivity to unfractionated and low-molecular-weight heparins and semisynthetic heparinoids is increasingly common. 7 female patients between 30 and 74 years with delayed-type allergy to heparins and semisynthetic heparinoids were investigated for (cross)-reactivity to fondaparinux, a new pentasaccharide with selective factor Xa inhibition. All patients showed delayed-type reactions to heparins and some additional cross-reaction to a heparinoid on intracutaneous testing. 6/7 tolerated fondaparinux on intradermal testing as well as on subcutaneous challenge testing. However, the 7th patient developed a characteristic delayed-type reaction to both skin tests with fondaparinux. Fondaparinux is a new synthetic pentasaccharide with a molecular weight of 1.728 Da. In some patients with cross-reactivity between various heparins and semisynthetic heparinoids, lepirudin, a recombinant hirudin, may be a safe and effective alternative. However, combined allergy to hirudin and heparins has been reported. Sometimes, intravenous administration of heparins or heparinoids may be tolerated. However, these patients are at risk of developing a systemic reaction. The pathogenesis of heparin hypersensitivity is not fully understood. Heparins...Continue Reading
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