An Exploratory Study on Physical Function in Stem Cell Transplant Patients Undergoing Corticosteroid Treatment for Acute Graft-Versus-Host-Disease.

ABSTRACT: Acute graft-versus-host disease after allogeneic hematopoietic stem cell transplantation is treated with corticosteroids, placing patients at risk for steroid myopathy. In this single-arm cohort study, 23 patients who were started on high-dose corticosteroids for acute graft-versus-host disease underwent a series of functional tests (baseline and days 14, 28, and 56): 6-min walk test, hip flexor and knee extensor strength via dynamometry, five times sit-to-stand, Brooke scale for myopathy, modified Adult Myopathy Assessment Tool, and manual muscle testing. Participants were prescribed home exercises including walking and resistance exercises, with low adherence. Fifteen (63%) participants were male and median (range) age was 60 (36-70) yrs. Median (range) corticosteroid duration and cumulative equivalent methylprednisolone dose were 66 (22-165) days and 3625 (1020-11720) mg, respectively. At day 14, there was a significant decline in five times sit-to-stand (P = 0.0132), knee extensor (P = 0.0182), and manual muscle testing (P = 0.0466). Functional tests negatively associated with cumulative corticosteroid dose included 6-min walk test distance (P = 0.0103), hip flexor strength (P = 0.0262), knee extensor strength (P = 0.0369), and manual muscle testing strength (P = 0.0319). Five times sit-to-stand was positively associated with corticosteroid dose (P = 0.0003). In conclusion, stem cell transplant patients receiving high-dose corticosteroids for acute graft-versus-host disease are at risk for weakness detected as early as day 14. Increasing adherence to exercise may mitigate these changes.