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Characterization of the rate, predictors, and thrombotic complications of thrombocytosis in iron deficiency anemia

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The association of thrombocytosis with iron deficiency anemia (IDA) is well‐recognized, but data describing the rate, predictors, and risk of thrombotic complications associated with IDA‐related thrombocytosis are limited. We queried… Click to show full abstract

The association of thrombocytosis with iron deficiency anemia (IDA) is well‐recognized, but data describing the rate, predictors, and risk of thrombotic complications associated with IDA‐related thrombocytosis are limited. We queried an institutional patient data repository containing comprehensive chart data for over 6 million patients to identify IDA patients with and without thrombocytosis and thrombotic events over a 40‐year time period (1979 to 2019). Demographics, hematological parameters, thrombosis history, and other medical history were collected. Fidelity of query data was assessed via detailed manual chart review of 700 patients, including confirmation of ferritin and hematologic parameters in addition to temporal and clinical association of thrombocytosis. Our queries identified 36 327 cases of IDA of which 15 022 had thrombocytosis. Following assessment for data integrity, we observed a thrombocytosis rate of 32.6% in patients with IDA. The rate of thrombosis was calculated to be 7.8% in patients with IDA and 15.8% in patients with IDA and thrombocytosis. Platelet mass index at time of peak thrombocytosis was significantly higher than at baseline and was strongly negatively correlated with hemoglobin at peak thrombocytosis. A multivariable model demonstrated a significant predictive relationship between decreasing hemoglobin and increasing platelet count at peak thrombocytosis. In conclusion, we observed reactive thrombocytosis in one‐third of IDA patients, and a 2‐fold thrombosis risk in patients with IDA and thrombocytosis compared with patients with IDA alone. Given the global burden of untreated and undertreated IDA, adequate IDA treatment may reduce thrombotic complications and associated morbidity and mortality.

Keywords: thrombocytosis; thrombocytosis iron; thrombotic complications; rate; iron deficiency; patients ida

Journal Title: American Journal of Hematology
Year Published: 2020

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