Adverse Impacts of Corticosteroid Treatment on Osteoporosis/Osteopenia in Adult Asthmatics: A Retrospective ICARUS Cohort Study

Abstract

BACKGROUND: Inhaled corticosteroid (ICS) and oral corticosteroid (OCS) are often used in asthma management. OBJECTIVE: To evaluate the long-term effect of ICS/OCS on osteoporosis, osteopenia, fractures, and bone metabolism in adult patients with asthma in real-world clinical practice. METHODS: This is a retrospective study investigating deidentified electronic health records from Ajou University Medical Center (Korea). Adult patients with asthma receiving maintenance ICS with/without OCS for at least 1 year were enrolled. They were classified into the high/low-dose of ICS or OCS group. Primary outcomes (incidences of osteoporosis, osteopenia, and fractures) and secondary outcomes (drug prescription and laboratory values related to bone metabolism including albumin and alkaline phosphatase) were compared after 5 years of follow-up. RESULTS: After propensity score matching, both high- and low-dose OCS groups included 468 patients, and high/low-dose ICS groups each comprised 1252 patients. The risk of osteoporosis/major fracture was higher (hazard ratio [95% CI], 2.00 [1.15-3.57]/3.03 [1.04-11.11]) in the high-dose OCS group (especially in females aged >/=50 years) than in the low-dose group, although the ICS groups showed no significant differences. The high-dose ICS group showed a higher risk of osteopenia (1.92 [1.05-3.70]) than the low-dose ICS group. The linear mixed model of laboratory values showed significantly decreased serum albumin and increased alkaline phosphatase in the high-dose OCS group than in the low-dose OCS group. CONCLUSIONS: The results of this study suggest that long-term use of OCS can increase the risk of osteoporosis and osteoporosis-related fractures, whereas long-term use of ICS may increase the risk of osteopenia in adult patients with asthma.