Platelet dysfunction in patients with vitamin B12 deficiency

Area of Science:

• Hematology
• Internal Medicine
• Nutritional Science

Background:

• Pernicious anemia is an autoimmune condition affecting vitamin B12 absorption.
• Hematologic abnormalities, including platelet dysfunction, can occur in pernicious anemia.

Purpose of the Study:

• To investigate platelet aggregation and bleeding time in patients with pernicious anemia.
• To assess the impact of vitamin B12 treatment on these hematologic parameters.

Main Methods:

• Case series analysis of 10 pernicious anemia patients.
• Evaluation of platelet aggregation using various agonists (epinephrine, fibrinogen, ADP, ristocetin).
• Assessment of bleeding time and platelet size distribution.

Main Results:

• Abnormal platelet aggregation was observed in 6 out of 10 patients.
• Thrombocytopenia was present in 5 patients, with 3 experiencing prolonged bleeding time.
• Vitamin B12 treatment normalized platelet aggregation and bleeding time.
• Post-treatment platelet size approached normal, but not significantly different.

Conclusions:

• Pernicious anemia can be associated with significant platelet abnormalities.
• Vitamin B12 repletion effectively corrects these hematologic disturbances.
• Platelet function and hemostasis are influenced by vitamin B12 levels.