Invasive Pulmonary Aspergillosis in Hospitalized Hematopoietic Stem Cell Transplantation Recipients: Outcomes Based on the United States National Readmission Database.

Background and objective: Hematopoietic stem cell transplant (HSCT) is a well-established treatment for hematologic malignancies and certain autoimmune and congenital conditions. HSCT is associated with immunocompromise and increased risk of infections. This study assessed whether invasive pulmonary aspergillosis (IPA) affects in-hospital mortality and 30-day readmission among HSCT patients. A secondary objective was to examine potential differences in complications between HSCT with and without IPA.

Materials and methods: A retrospective study of a nationally representative cohort of hospital admissions was conducted, with data collected from the Agency for Healthcare Research and Quality's Healthcare Cost and Utilization Project Nationwide Readmissions Database between 2013 and 2019. The International Classification of Diseases, 10th revision (ICD-10), and 9th revision (ICD-9) diagnostic codes were used to identify patients with IPA and HSCT. All adult patients ≥18 years were included in the study.

Results: There were 90,451 hospitalizations for HSCT from 2013 to 2019; 89,331 (98.8%) had HSCT without IPA, while 1092 (1.2%) hospitalizations had HSCT with IPA. The in-hospital mortality for HSCT-IPA was higher compared to HSCT without IPA (18.3% vs. 4.2%; p < 0.001). HSCT-IPA had a significantly higher 30-day readmission rate (36.2%) than that of HSCT without IPA (24.0%). HSCT-IPA also had a higher mean cost of admission ($303,437) than that of HSCT without IPA ($57,587).The HSCT-IPA group had higher multi-organ complications, including respiratory failure (51.3% vs. 13.5%, p < 0.001), sepsis (38.2% vs. 18.5%, p < 0.001), septic shock (16.1% vs. 5.1%, p < 0.001), need for mechanical ventilation (21.1% vs. 5.1% p < 0.001), non-invasive positive pressure ventilation (4.9% vs. 2.5%, p < 0.001), and intensive-care unit admission (21.8% vs. 6.1% p < 0.001).

Conclusion: IPA is a rare but severe complication associated with HSCT, with higher in-hospital mortality, complications due to multi-organ failure, readmission rates, and cost of hospitalization when compared to HSCT without IPA.