[Hemostasis disorders in patients with systemic AL-amyloidosis]

To analyze the frequency and nature of hemorrhagic and thrombotic complications in patients with systemic AL-amyloidosis and compare with laboratory changes in the hemostasis system.

The prospective study included 40 patients with newly diagnosed AL-amyloidosis. To detect amyloid, all patients underwent bone marrow trephine biopsy and duodenal biopsy, and 28 (70%) patients underwent biopsy of the affected organ. Before the start of therapy, all patients were determined the platelet count, activated partial thromboplastin time, thrombin time, fibrinogen concentration, time of XIIa-dependent fibrinolysis, antithrombin III, D-dimer, activity of blood coagulation factors VIII, X and vWF. The statistical part of the study was carried out using the IBM SPSS Statistics 2017 system software (SPSS, Chicago, IL, USA).

In 20 (50%) patients, hemorrhages on the skin and mucous membranes were diagnosed as vascular purpura. Before the start of therapy, 7 (17.5%) patients had thrombosis, including leg vein thrombosis (5 patients), ischemic stroke (2 patients). There was a direct correlation between thrombotic complications and cutaneous hemorrhagic syndrome (p=0.007). In 15 (75%) cases, cutaneous hemorrhagic syndrome was accompanied by hypercoagulable shifts in the hemostasis system. Of the 20 patients with cutaneous hemorrhagic syndrome, 19 (95%) patients had kidney damage, including 15 patients with nephrotic syndrome. Hematoma type of bleeding, as well as heavy bleeding was not observed, including after a biopsy of the internal organs. According to the totality of hemostasis indicators, hypercoagulation syndrome was more often observed (in 23; 56% of patients). Hypocoagulation was diagnosed only in 2 (5%) patients with liver damage, 16 (39%) patients had normocoagulation.

Cutaneous hemorrhagic syndrome is the most common clinical manifestation of disorders in the hemostasis system in patients with AL-amyloidosis. The relationship of hemorrhages on the skin with nephrotic syndrome has been established, which may indicate a single pathogenetic mechanism. Cutaneous hemorrhagic syndrome is associated with hypercoagulable shifts in hemostasis and a high risk of thrombotic complications.