Abstract
Poster session 2, September 22, 2022, 12:30 PM - 1:30 PM ObjectiveThis case series describes our experience of using isavuconazole (ISVCZ), along with TDM, after the failure of treatment with Amphotericin B (AmB) and Posaconazole (PCZ) due to the better PK PD properties of ISVCZ.Patients and methodsThere were 6 patients with ROCM who had disease progression despite surgical debridement and adequate treatment with AmB and PCZ. Anti-fungal treatment was switched to ISVCZ which achieves levels in brain (1.86x)R and in bone-marrow (3x)R as compared to serum levelsR.ResultsPK PD considerations for ISVCZ treatment considering the likely levels in brain and bone-marrow and the MIC of majority of Mucoralean molds as ≤4RTable 1Table 2Results of treatmentConclusionTreatment with ISVCZ may mitigate some of the challenges in ROCM due to its PK PD properties. TDM for ISVCZ is not routinely recommended, but could be used to ensure high plasma exposures and enhanced penetration to the site of infection. Our results are encouraging although there are several limitations of a case series, confounding variables involved, and the use of ISVCZ as salvage after failure of previous treatment.Clinical success in this series suggests that extrapolative PK PD considerations in using ISVCZ for such ‘difficult to treat’ patients may be justified.
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