Acute bleeding and thrombocytopenia after bone marrow transplantation

Area of Science:

• Hematology
• Transplantation Medicine
• Oncology

Background:

• The link between hemorrhage and thrombocytopenia is established in leukemia and applied to bone marrow transplant (BMT) patients.
• The specific role of thrombocytopenia in post-BMT bleeding remains under-investigated.

Purpose of the Study:

• To evaluate the risk of bleeding and associated outcomes in BMT patients with thrombocytopenia.
• To analyze the correlation between varying degrees of thrombocytopenia and bleeding events post-BMT.

Main Methods:

• A case-control study comparing 321 BMT patients with bleeding (BLD) to 287 without (NBLD).
• Prophylactic platelet transfusions were administered at a trigger of 20 x 10(9)/l.
• Thrombocytopenia levels were assessed before bleeding onset and on the day of bleeding events.

Main Results:

• Profound thrombocytopenia (<= 10 x 10(9)/l) was significantly more frequent in BLD patients (8.6%) than NBLD patients (2.1%-4%) in the weeks preceding bleeding (P < 0.02).
• On the day of bleeding, platelet counts <= 10 x 10(9)/l occurred in 13.5% of episodes, 11-20 x 10(9)/l in 20.4%, and > 20 x 10(9)/l in 66.1%.
• Overall survival was not linked to pre-bleeding thrombocytopenia severity in BLD patients, but was reduced with thrombocytopenia severity in NBLD patients.

Conclusions:

• Bleeding post-BMT is significantly associated with thrombocytopenia, though profound thrombocytopenia's attributable risk for bleeding is not substantial.
• Thrombocytopenia may serve as a critical clinical marker in non-bleeding BMT patients, suggesting further investigation into its relation to other acute toxicities.