Rheumatoid arthritis patients who are on both oral glucocorticoids (CGs) and proton pump inhibitors (PPIs) have an increased risk of osteoporotic fractures, according to a retrospective study of RA patients in the United Kingdom.
“Considering the increasing life expectancies and high consumption of PPIs among elderly patients, fracture risk assessment could be considered when a patient with RA is co-prescribed oral GCs and PPIs,” wrote Shahab Abtahi, MD, of Maastricht (Netherlands) University Medical Centre and colleagues. The study was published in Annals of the Rheumatic Diseases.
To determine if concomitant use of the two medications – both already associated with osteoporotic fractures – would lead to a notable increase in fracture risk, the researchers conducted a population-based cohort study of RA patients aged 50 years or older who were diagnosed during 1997-2017. Patient data was gathered via the Clinical Practice Research Datalink, a primary care database of millions of U.K. medical records.
Patients with a recent history of GC/PPI use or those with a previous osteoporotic fracture were excluded from the study. Osteoporotic fractures were defined as fractures of the hip, vertebrae, humerus, forearm, pelvis, or rib. The study population included 12,351 patients, roughly two-thirds of whom were women, with a mean age of 68 years. Of the population, 4,254 patients were concomitant users of oral GCs and PPIs, compared with 3,138 patients who were not on either medication.
Among all patients, 1,411 osteoporotic fractures occurred, 264 of which occurred in the concomitant users group. After adjustments for age and sex, patients on both medications had a higher risk of fracture (adjusted hazard ratio, 1.93; 95% confidence interval, 1.65-2.27), compared to patients on oral GCs alone (aHR, 1.34; 95% CI, 1.12-1.59) or PPIs alone (aHR, 1.32; 95% CI, 1.14-1.54). After full adjustment, concomitant users again had a higher risk of fracture (aHR, 1.60; 95% CI, 1.35-1.89).
Regarding specific types of breaks, the concomitant users had a notably higher risk of hip (aHR, 1.45; 95% CI, 1.11-1.91), vertebrae (aHR, 2.84; 95% CI, 1.87-4.32), pelvis (aHR, 2.47; 95% CI, 1.41-4.34), and rib fractures (aHR, 4.03; 95% CI, 2.13-7.63). No increased risk was found for either humerus or forearm fractures. The risk of fracture did not rise for concomitant users who had either increasing daily doses of PPI or a longer duration of use.
The authors noted their study’s potential limitations, including having access to data on prescriptions only, not the actual use of medication, and a lack of information in the medical records regarding biologic therapies or certain indicators of RA disease activity. In addition, there was a likelihood that some patients who were improving might have stopped taking the drugs and lessened their risk of fracture, though the researchers attempted to account for this by “adjusting our analyses for six indicators of RA severity, including analgesics and csDMARDs.”
Two of the authors reported receiving research grants and speakers’ fees from various pharmaceutical companies. The others reported no conflicts of interest.
SOURCE: Abtahi S et al. Ann Rheum Dis. 2020 Dec 11. doi: 10.1136/annrheumdis-2020-218758.