Health Care Costs in Patients with Painful Diabetic Peripheral Neuropathy Prescribed Pregabalin or Duloxetine
PAIN PRACTICE
Authors: Burke, James P.; Sanchez, Robert J.; Joshi, Ashish V.; Cappelleri, Joseph C.; Kulakodlu, Mahesh; Halpern, Rachel
Abstract
Background: Pregabalin and duloxetine are two FDA-approved medications for the treatment of pain associated with diabetic peripheral neuropathy (pDPN). The objective of this study was to compare changes in all-cause and pDPN-related health care costs in patients with pDPN initiated on pregabalin or duloxetine. Methods: Patients at least 18 years of age initiating pregabalin or duloxetine between March 1, 2006 and December 31, 2008 were identified from a large U. S. managed care plan database. The date of the first pregabalin or duloxetine prescription was defined as the index date. Patients with claims-based evidence of pDPN and who had continuous enrollment for 6-month pre-and post-index periods were selected for study inclusion. Duloxetine patients with depression or generalized anxiety disorder (GAD) were excluded. All-cause and pDPN-related total health care costs (over 6 month pre-index and post-index periods) were analyzed with difference-in-differences (DiD) models. Results: A total of 2,136 patients (1,785 pregabalin and 351 duloxetine) were identified. No significant differences in gender, age, or pre-index Quan-Charlson comorbidity score were observed between the two cohorts. No significant differences (pregabalin vs. duloxetine) in pre-index to post-index change in mean all-cause health care costs ($ 1,411 vs. $ 1,560, P = 0.93) or mean pDPN-related health care costs ($ 704 vs.)$ 240, P = 0.22) were found. The DiD models showed no significant difference in all-cause (mean) costs attributable to pregabalin vs. duloxetine therapy between pre-index and post-index periods (mean cost ratio = 0.97, 95% CI: 0.75 to 1.26), but showed that patients receiving pregabalin had a significantly higher increase in pDPN-related costs compared with patients receiving duloxetine (mean cost ratio = 2.35, 95% CI: 1.01 to 5.46). However, the difference (pre-to post-index) in pDPN-related costs attributable to pregabalin vs. duloxetine therapy was nonsignificant (mean cost ratio = 2.30, 95% CI: 0.93 to 5.68) in a sensitivity analysis in which patients with depression and GAD were excluded from both cohorts. Conclusion: No differences were noted in all-cause costs attributable to pregabalin or duloxetine. Although patients receiving pregabalin had a significantly greater pre-to post-index increase in pDPN-related health care costs compared with patients receiving duloxetine, this may have been due to an imbalance in patient exclusion criteria between cohorts.
Projections of the posterodorsal preoptic nucleus and the lateral part of the posterodorsal medial amygdala in male gerbils, with emphasis on cells activated with ejaculation
JOURNAL OF COMPARATIVE NEUROLOGY
Authors: Simmons, DA; Yahr, P
Abstract
The posterodorsal preoptic nucleus (PdPN) and the lateral part of the posterodorsal medial amygdala (MeApd) express Fos with ejaculation in male gerbils. Ejaculation-activated cells participate in the PdPN and MeApd projections to each other and to the sexually dimorphic preoptic area (SDA), but those projections involve less than 20% of the activated PdPN cells and less than 50% of the activated MeApd cells. To identify other potential targets of ejaculation-activated cells, we traced PdPN and lateral MeApd outputs using biotinylated dextran amine. The principal part of the bed nucleus of the stria terminalis (BSTpr) and the anteroventral periventricular nucleus (AVPv) were labeled from both sites and were injected with Fluoro-Gold to determine whether PdPN and lateral MeApd cells that express Fos with ejaculation would be retrogradely labeled. Fluoro-Gold was also applied to the dorsomedial hypothalamus (DMH) and retrorubral field (RRF) because such injections label PdPN cells in rats. The PdPN-DMH projection is minimal in gerbils, involving few, if any, ejaculation-related cells, Ejaculation-activated PdPN cells project to the AVPv (43%), dorsal BSTpr (30%), and RRF (12%). Those in the lateral MeApd project to the dorsal BSTpr (43%) and AVPV (18%). When these percentages are combined with those for ejaculation-activated cells involved in the PdPN and lateral MeApd projections to each other and to the medial SDA, the totals reach 100%. Thus, every PdPN and MeApd cell activated with ejaculation may participate in one of these projections. Similar projections may contribute to the similar behavioral effects of the PdPN and (C) 2002 Wiley-Liss, Inc.