Publications by Year: 2014

Desai RJ, Hernandez-Diaz S, Bateman BT, Huybrechts KF. In Reply: Cho et al. Obstet Gynecol 2014;124(3):638.
Desai RJ, Hernandez-Diaz S, Bateman BT, Huybrechts KF. Increase in prescription opioid use during pregnancy among Medicaid-enrolled women. Obstet Gynecol 2014;123(5):997-1002.Abstract
OBJECTIVE: To report the prevalence of prescription opioid use and evaluate the trends in a large cohort of Medicaid-enrolled pregnant women. METHODS: A cohort of pregnancies was identified using data from the Medicaid Analytical eXtract for the period of 2000-2007. Dispensing of opioids, as a class and separately for individual agents, was evaluated using claims from filled prescriptions. Variations in patterns of prescription opioid fills were examined by demographic characteristics, by geographic region, and over time. Median number of opioid prescriptions dispensed and cumulative days of availability for prescription opioids during pregnancy were reported. RESULTS: The study population consisted of more than 1.1 million women with completed pregnancies from 46 U.S. states and Washington, DC. One of five women from our cohort (21.6%) filled a prescription for an opioid during pregnancy; this proportion increased from 18.5% in 2000 to 22.8% in 2007. Substantial regional variation was seen with the proportion of women who filled a prescription during pregnancy, ranging between 9.5% and 41.6% across the states. Codeine and hydrocodone were the most commonly prescribed opioids. Among women filling at least one opioid prescription, the median (interquartile range) number of prescriptions filled was 1 (1-2) and the median (interquartile range) cumulative days of opioid availability during pregnancy were 5 (3-13) days. CONCLUSION: We observed high and increasing number of filled prescriptions for opioids during pregnancy among Medicaid-enrolled women. These findings call for further safety evaluations of these drugs and their effects on the developing fetus to inform clinical practice. LEVEL OF EVIDENCE: II.
Desai RJ, Rao JK, Hansen RA, Fang G, Maciejewski ML, Farley JF. Predictors of treatment initiation with tumor necrosis factor-α inhibitors in patients with rheumatoid arthritis. J Manag Care Spec Pharm 2014;20(11):1110-20.Abstract
BACKGROUND: Introduction of biologic disease-modifying antirheumatic drugs (DMARDs) has revolutionized treatment in patients with rheumatoid arthritis (RA). However, due to substantially higher costs of biologics compared with nonbiologics, patients with less insurance generosity may have difficulty affording these agents, which may lead to potential access disparities. OBJECTIVE: To identify factors affecting treatment initiation with tumor necrosis factor (TNF)-α inhibitor biologics in patients with RA. METHODS: Health insurance claims data derived from Truven's MarketScan Commercial Claims and Encounters and Medicare Supplemental and Coordination of Benefits (2007-2010) were used to conduct a retrospective cohort study. Two separate cohorts of RA patients were identified: (1) monotherapy nonbiologic DMARD users and (2) combination therapy nonbiologic DMARD users. The primary outcome was TNF-α inhibitor initiation 12 months following an index inpatient or outpatient RA visit during 2008-2009. Predictors were measured 12 months pre-index and grouped into predisposing, enabling, or need factors based on Andersen's Behavior Model. Predisposing variables included age, sex, and geographic location; enabling variables included insurance-related factors such as capitation, payer type, and insurance generosity, which was defined using cost-sharing information from prescriptions filled by the patients in the previous year; and need variables included disease-related factors such as severity of RA, use of pain control medications, and presence of other comorbidities. Hierarchical logistic regression models were used to derive estimates of the impact of individual predictors. RESULTS: Initiation of TNF-α inhibitors was observed in 10.31% of the monotherapy nonbiologic DMARD users (1,922 of 18,641) and 13.09% of combination nonbiologic DMARD users (983 of 7,508). Among monotherapy nonbiologic DMARD users, initiation with TNF-α inhibitors was associated with the predisposing factors of age (OR = 0.98, 95% CI = 0.97-0.98 for each year increase) and geographic region (Midwest vs. South OR = 0.83, 95% CI = 0.73-0.93; Northeast vs. South OR = 0.77, 95% CI = 0.64-0.92; and West vs. South OR = 0.86, 95% CI = 0.74-0.99); enabling factors of visit to rheumatologists (1 visit vs. no visit OR = 1.22, 95% CI = 1.01-1.46), health insurance type (commercial vs. Medicare supplemental OR = 0.79, 95% CI = 0.66-0.95), and drug benefit generosity (above average vs. poor OR = 1.16, 95% CI = 1.01-1.34 and most generous vs. poor OR = 1.21, 95% CI = 1.05-1.40); and need factors of RA severity (OR = 1.19, 95% CI = 1.14-1.23 for each unit increase in a claims-based RA severity index [CIRAS]), pre-index pain reliever use (steroids OR = 1.81, 95% CI = 1.62-2.02; nonselective nonsteroidal anti-inflammatory drugs [NSAID] OR = 1.17, 95% CI = 1.05-1.31; COX-2 inhibitors OR = 1.22, 95% CI = 1.05-1.41), and comorbidities (OR = 0.94, 95% CI = 0.90-0.99 for each unit increase in a comorbidity index). Treatment initiation with TNF-α inhibitors among patients with combination therapy nonbiologic DMARDs use at baseline was associated with age (OR = 0.98, 95% CI = 0.97-0.99 for each year increase) and region (Midwest vs. South OR = 0.81, 95% CI = 0.68-0.96). Stronger associations with some of the need factors were observed (CIRAS OR = 1.28, 95% CI = 1.21-1.35 for each unit increase, steroids use OR = 2.05, 95% CI = 1.73-2.42, and nonselective NSAID use OR = 1.36, 95% CI = 1.17-1.58) in these patients compared with the monotherapy nonbiologic DMARD users. However, unlike the monotherapy DMARD user group, the enabling factors of health insurance type and drug benefit generosity were not found to be associated with TNF-α inhibitor initiation among nonbiologic DMARD combination therapy users. CONCLUSIONS: Potential disparities in the initiation of TNF-α inhibitors among RA patients on monotherapy DMARDs at baseline were noted among older patients, patients in certain geographic region of the United States, and patients with less generous prescription drug benefits. Although future research should examine the impact of these disparities on health outcomes, payers should be aware of the potential for undertreatment among these groups of RA patients when making formulary decisions.
Desai RJ, Rao JK, Hansen RA, Fang G, Maciejewski M, Farley J. Tumor necrosis factor-α inhibitor treatment and the risk of incident cardiovascular events in patients with early rheumatoid arthritis: a nested case-control study. J Rheumatol 2014;41(11):2129-36.Abstract
OBJECTIVE: To compare the risk of cardiovascular (CV) events between use of tumor necrosis factor-α inhibitors (TNFi) and nonbiologic disease-modifying antirheumatic drugs (DMARD) in patients with early rheumatoid arthritis (RA). METHODS: A nested case-control study was conducted using data from Truven's MarketScan commercial and Medicare claims database for patients with early RA who started treatment with either a TNFi or a nonbiologic DMARD between January 1, 2008, and December 31, 2010. Date of CV event diagnosis for cases was defined as the event date, and 12 age-matched and sex-matched controls were sampled using incidence density sampling. Drug exposure was defined into the following mutually exclusive categories hierarchically: (1) current use of TNFi (with or without nonbiologics), (2) past use of TNFi (with or without nonbiologics), (3) current use of nonbiologics only, and (4) past use of nonbiologics only. Current use was defined as any use in the period 90 days prior to the event date. Conditional logistic regression models were used to derive incidence rate ratios (IRR). RESULTS: From the cohort of patients with early RA, 279 cases of incident CV events and 3348 matched controls were identified. The adjusted risk of CV events was not significantly different between current TNFi users and current nonbiologic users (IRR 0.92, 95% CI 0.59-1.44). However, past users of nonbiologics showed significantly higher risk compared to current nonbiologic users (IRR 1.47, 95% CI 1.04-2.08). CONCLUSION: No differences in the CV risk were found between current TNFi and current nonbiologic DMARD treatment in patients with early RA.