Abstract 333: Vascular Type Ehlers Danlos Syndrome is Associated With Thrombocyte Dysfunction and Low Vitamin D Serum Concentration

Abstract

Introduction: The Ehlers-Danlos syndrome is a rare genetic disorder characterized by a heterogeneous mixture of orthopedic, visceral, ophthalmological and vascular affection based on an even broader variety of genetic subtypes. Besides disturbance in all-day life, vascular type EDS often results in life threatening spontaneous bleeding or aneurysm formation with high risk of rupture. Additional impairment of normal hemostasis, especially in emergency scenarios, is suspected. Material and methods: In collaboration with the German National EDS Initiative and funding by the Eva Luise and Horst Köhler Foundation for Rare Diseases, we set up a nationwide screening of blood coagulation tests in vascular type and mixture type EDS patients under normal conditions. Screening was made for blood count, bleeding time, factor XIII, fibrinogen, PFA100, Born aggregometry, ROTEM analysis, C-reactive protein and von Willebrand Factor activity. Results: The genetics of 25 vascular type EDS diagnosed patients in Germany are very heterogeneous, making results difficult to compare. Coagulation disorders of various kinds, however, do appear and affect every aspect of the coagulation cascade. Phenotypes worse within families with clear inheritance patterns suggesting a loss of function. Additionally Vitamin D3 shortage might impair bone mineralization worsening common orthopedic symptoms as well as vascular structural health. Outlook: Decision making for vascular surgery in EDS patients should be made very carefully. A complete coagulation workup together with a hematologist should precede surgery whenever possible. Our study will continue to enroll patients in order to generalize results and verify coagulation disorders.