Incidence of Thrombocytopenia With Different Continuous Renal Replacement Systems and Modalities in a Cardiac Intensive Care Unit

<b>Background:</b> Thrombocytopenia is due to multifactorial causes in critically ill patients. One etiology is continuous renal replacement therapy (CRRT); however, it is unknown if different modalities impact the incidence. <b>Objectives:</b> To compare the incidence of thrombocytopenia with the NxStage CRRT system using continuous venovenous hemodialysis (CVVHD) compared to the Prismaflex system using continuous venovenous hemodiafiltration (CVVHDF). <b>Methods:</b> This was a retrospective cohort study at a large academic medical center in the United States. Individuals aged 18 or older admitted to the cardiovascular ICU between June 1, 2016 and September 30, 2022, and received CRRT for at least 48 hours were identified. <b>Results:</b> One hundred and forty-seven patients met inclusion criteria. Sixty-one patients received CVVHD with the NxStage system, while 86 received CVVHDF with the Prismaflex system. Thrombocytopenia occurred in 57.4% of patients treated with NxStage vs 19.8% treated with Prismaflex (OR 5.46; 95% confidence interval [CI], 2.62-11.39). These results were consistent in an adjusted model (OR 5.57; 95% CI, 2.34-13.28). There was no difference in the time to thrombocytopenia between groups. Patients treated with the NxStage system had lower platelet nadirs, more heparin-induced thrombocytopenia testing, more direct thrombin inhibitor use, and more blood transfusions. <b>Conclusions:</b> A greater incidence of thrombocytopenia occurred in cardiovascular ICU patients treated with CVVHD using the NxStage system vs CVVHDF with the Prismaflex system.