Predictors of duloxetine versus other treatments among veterans with diabetic peripheral neuropathic pain: a retrospective study
Pain Practice,  Clinical Article

Zhao Y et al. – Diabetic peripheral neuropathic pain (DPNP) patients in the veterans affairs (VA) healthcare system with prior other treatment use, select comorbid conditions, prior substance abuse, prior opioid use, and higher pain level were more likely to receive duloxetine.

Methods
  • The electronic medical and pharmacy records from January 2004 to December 2008 were requested from the Veterans Integrated Service Network 16 data warehouse.
  • All select patients received either duloxetine or other treatments [tricyclic antidepressants (TCAs), venlafaxine, gabapentin, and pregabalin] over the study period, with the first dispense date of the index agent as the index date.
  • All patients must have 1+ prior DPNP diagnosis (ICD–9–CM: 250.6x or 357.2), but no diagnoses of prior depression (ICD–9–CM: 296.2, 296.3, 300.4, 309.1, or 311.0), fibromyalgia (ICD–9–CM: 729.1), or neuralgia (ICD–9–CM: 729.2).
  • Logistic regression was used to examine the predictors of receiving duloxetine versus other treatments, controlling for demographics, comorbidities, prior pain level, prior use of other medications, and opioid use.

Results
  • The analytical sample included 2,694 patients (duloxetine cohort, n = 216; other–treatment cohort, n = 2,478).
  • Prior uses of gabapentin (odds ratio [OR] = 13.66, 95% confidence interval [CI]: 9.70–19.24), TCAs (OR = 5.40, 95% CI: 3.73–7.82), or venlafaxine (OR = 3.67, 95% CI: 1.67–8.06) were strong predictors of duloxetine.
  • Other comorbidities associated with duloxetine were anxiety (OR = 2.08, 95% CI: 1.40–3.08), cerebrovascular disease (OR = 1.44, 95% CI: 1.01–2.07), and substance abuse (OR = 2.11, 95% CI: 1.10–4.03).
  • Prior opioid users were 1.47 (95% CI: 1.02–2.12) times as likely to receive duloxetine as those without prior opioid use.
  • Patients with self–reported severe pain were 1.66 (95% CI: 1.11–2.50) times as likely to receive duloxetine as those with no pain reported.

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