Incidence and prognostic significance of thrombocytopenia in patients treated with prolonged heparin therapy

Archives of Internal Medicine
Gustavo B F OliveiraComplications After Thrombocytopenia Caused by Heparin (CATCH) Registry Investigators

Abstract

Despite widespread heparin use in clinical practice, the associated development of thrombocytopenia is an underrecognized and undertreated complication. We analyzed data from consecutive hospitalized patients treated with heparin (unfractionated or low molecular weight) for 4 days or longer to determine the incidence, predictors, prognostic significance, and management of "thrombocytopenia," defined as a platelet count less than 150 x 10(9)/L, reduction in platelet count of 50% or more from the admission level, or both. We enrolled 2420 patients (median age, 65.2 years; 43.8% women) in 48 US hospitals. Thrombocytopenia occurred in 881 patients (36.4%; 95% confidence interval [CI], 34.5%-38.3%). Of those who developed thrombocytopenia, 5.1% died, compared with 1.6% of those without thrombocytopenia (odds ratio [OR], 3.4; 95% CI, 2.1-5.6; P< .001). Thrombocytopenia was also associated with greater risk of myocardial infarction (OR, 2.1; 95% CI, 1.5-2.8; P< .001) and congestive heart failure (OR, 1.3; 95% CI, 1.1-1.6; P= .01). After adjustment for important covariates, thrombocytopenia remained an independent predictor of thrombotic and hemorrhagic events. A relative reduction in platelet count of more than 70% was the strongest i...Continue Reading

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