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ORIGINAL ARTICLE
Year : 2022  |  Volume : 12  |  Issue : 4  |  Page : 190-196

Early onset delirium incidence and risk factors in hematology oncology patients admitted to the intensive care unit: A retrospective cohort study


1 Department of Pharmacy Practice, Binghamton University School of Pharmacy and Pharmaceutical Sciences, Johnson City, NY, The United States of America
2 Department of Pharmacy, The Ohio State University Wexner Medical Center, Columbus, Ohio, The United States of America
3 College of Pharmacy, The Ohio State University, Columbus, Ohio, The United States of America
4 Division of Pulmonary Diseases, Critical Care Medicine, and Sleep, Department of Internal Medicine, The Ohio State University College of Medicine, Columbus, Ohio, The United States of America
5 Center for Biostatistics, The Ohio State University, Columbus, Ohio, The United States of America

Correspondence Address:
Dr. Jessica L Elefritz
410 W 10th Ave, 368 Doan Hall, Department of Pharmacy, The Ohio State University Wexner Medical Center, Columbus, OH 43210
The United States of America
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/ijciis.ijciis_35_22

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Background: Delirium occurs frequently in intensive care unit (ICU) patients; however, there are limited data evaluating its impact on critically ill hematology-oncology patients. We aimed to determine the incidence and risk factors for early-onset delirium development in hematology-oncology patients admitted to the ICU. Methods: This single-center, retrospective cohort study evaluated the primary outcome of incident delirium within 7 days of ICU admission in adults admitted to the hematology-oncology medical or surgical ICU. Patients with delirium (DEL) were compared to those without (No-DEL) for evaluation of secondary endpoints including hospital mortality, ICU, and hospital length of stay (LOS). Multivariable logistic regression modeling was performed to identify independent risk factors for delirium. Results: Delirium occurred in 125 (51.2%) of 244 patients. Inhospital mortality was significantly higher in the DEL vs. No-DEL group (32.8% vs. 15.1%, P = 0.002). Median (1st and 3rd quartiles) ICU and hospital LOS were significantly longer in the delirium group, respectively (6 [4–10] days vs. 3 [2–5] days, P < 0.001, and 21 [14–36] days vs. 12 [8–22] days, P < 0.001). Higher Sequential Organ Failure Assessment score, high-dose corticosteroids, mechanical ventilation (MV), and brain metastases were each independently, associated with an increased delirium risk. Conclusion: Hematology-oncology patients admitted to the ICU frequently develop delirium. Consistent with literature in nonhematology-oncology critically ill patients, identified independent risk factors for delirium were MV and organ dysfunction. Risk factors unique to the critically ill hematology-oncology patient population include high-dose corticosteroids and brain metastases. Further research is needed to evaluate strategies to mitigate delirium development in this population based on risk assessment.


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