Summary
In a family with a known antithrombin III abnormality (AT III Trento) an associated von Willebrand defect (Type I) was found. The two defects seem to segregate independently. In fact four types of individuals were present, namely: subjects with isolated AT III abnormality, subjects with isolated von Willebrand defect, patients with double defect and normal subjects. Only one of the two patients with isolated AT III abnormality showed a thrombotic tendency. None of the patients with double defect showed thrombotic disease, indicating a possible protective action of the von Willebrand defect against thrombotic manifestations. Patients with isolated von Willebrand defect showed neither thrombotic nor bleeding manifestations. The study emphasizes the need for a careful evaluation of the hemostatic balance of patients with AT III abnormalities before concluding that they are symptomatic or asymptomatic.
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This study was supported by Grants from the CNR (Grant 84.02363.56 II 5.01677), from the M. P. I. Rome (Grant 1592–1984) and from the Veneto Region, Venice, Italy
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Girolami, A., Cappellato, M.G., Vicarioto, M.A. et al. Associated von Willebrand disease as a possible cause of lack of thrombosis in an AT III abnormality (AT III Trento). Blut 52, 29–33 (1986). https://doi.org/10.1007/BF00320139
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DOI: https://doi.org/10.1007/BF00320139