Bleeding in a patient taking Lorenzo's oil: evidence for a vascular defect

Area of Science:

• Biochemistry
• Hematology
• Neurology

Background:

• Adrenoleukodystrophy (ALD) is a rare genetic disorder affecting the adrenal glands and white matter of the nervous system.
• Lorenzo's oil, a mixture of glycerol trioleate and glycerol trierucate, is used to manage ALD by altering fatty acid metabolism.

Observation:

• A patient with ALD on Lorenzo's oil presented with purpura, petechiae, and significant bleeding.
• Laboratory tests revealed a markedly prolonged bleeding time (>20 min) and borderline thrombocytopenia (120 x 10(9)/1).

Findings:

• Conventional platelet aggregation studies were largely normal, with only a borderline response to low-concentration collagen.
• A novel assay using immobilized von Willebrand factor also yielded normal results.
• These findings suggest a defect beyond standard platelet function, potentially involving vascular integrity or platelet-endothelial interactions.

Implications:

• The study highlights a potential complication of Lorenzo's oil therapy, characterized by a bleeding diathesis.
• It suggests that impaired vascular wall function or abnormal interactions between platelets and the endothelium may underlie the bleeding observed in this ALD patient.
• Further investigation into these specific mechanisms is warranted to optimize treatment strategies for ALD patients.