Introduction:
Despite improvements in pediatric heart transplant outcomes, respiratory syncytial virus (RSV) and vaccine preventable infections (R/VPI) are a major cause of morbidity and hospital resource use. The frequency and risk factors for hospitalizations due to R/VPI in heart transplant recipients are unknown.
Methods:
Patients ≤18 years who underwent heart transplantation at hospitals contributing to the Pediatric Health Information System database from 9/2003 to 12/2018 were identified. The transplant hospitalization and subsequent hospitalizations for R/VPI through 12/2018 were analyzed. Risk factors for R/VPI hospitalizations were evaluated using negative regression binomial models adjusted for potential demographic and clinical confounders. Total hospital costs were determined adjusted for 2018 US $.
Results:
Of 3,815 transplant recipients, 681 (17.9%) had a R/VPI hospitalization during 23,746 available person-years of follow-up after transplant. There were 984 R/VPIs diagnosed during 951 hospitalizations, and 440 (44.7%) occurred in the first year after transplant (Figure). The most common causes were RSV (n=380; 38.6%), influenza (n=265; 26.9%), and pneumococcus (n=105; 10.7%). In adjusted analyses, there was an increased risk of R/VPI hospitalization in patients requiring mechanical circulatory support prior to transplant, those who received induction with ≥ 2 immunosuppressive agents, and patients <2 years old. The median length of stay for a R/VPI hospitalization was 4 days (interquartile range [IQR]: 2-8 days) with a median total cost of $11,081 (IQR: $6,215 - $24,322).
Conclusions:
Hospitalization for R/VPIs occurred frequently following pediatric heart transplantation and were associated with significant cost. Potential strategies to minimize R/VPI could include expanding vaccine use through accelerated immunization schedules in younger patients and routine monitoring of immunogenicity after vaccination.