Tumor necrosis factor-alpha inhibitors (TNFi), the best-studied biologic DMARDs, can be given before conception and during the first and early second trimester; however, use in late pregnancy requires different considerations because transplacental passage varies based on differences related to their structure. Some TNFis, such as certolizumab pegol (Cimzia), have small affinity to the fetal Fc receptor or no Fc part and show low transplacental passage to the fetus. TNFis that possess an Fc part of immunoglobulin G1, however, allow high amounts of transfer and should be avoided in the third trimester whenever possible, Dr. Østensen said.
Data are sparse on human pregnancy exposure and fetal side effects and outcomes for most other biologics, so decisions to use biologics targeting B-cells, T-cell activation, or cytokines like interleukin (IL)-6, IL-23, IL-17, or IL-1beta must be based on the severity of maternal disease and reserved for cases in which no other safe options are available, Dr. Østensen cautioned.
So how can acute arthritis be treated during pregnancy? Options in RA include NSAIDs, short-term oral prednisone with rapid tapering or intramuscular injection of triamcinolone. Intra-articular steroid injection also might be considered, and TNFi in patients with severe polyarthritis. Spondyloarthritis might be treated with NSAIDs, intramuscular triamcinolone, or intra-articular steroid injection, with TNFi in severe cases.
Newer approaches to managing arthritis during pregnancy are to perhaps prescribe a TNFi with a low propensity for transplacental passage or to use a flexible regimen of TNFi by reducing the dose or prolonging the interval between administrations.
Continuing medications such as hydroxychloroquine, sulfasalazine, or azathioprine might be in some patients’ best interests to support remission and keep disease activity low, Dr. Østensen suggested. She noted that prednisone should be used at a low (5-7.5 mg) dose during pregnancy and that the aim should be to try to slowly reduce the use of pregnancy-compatible medications that are not necessary for continued remission, keeping a close eye on patients’ disease activity to ensure that no flares occur.
Dr. Chakravarty had no financial disclosures. Dr. Østensen reported receiving speaker fees and honoraria from UCB, Roche, AbbVie, MSD, Pfizer, and New Bridge.