• Richard J Barohn, Byron Gajewski, Mamatha Pasnoor, Alexandra Brown, Laura L Herbelin, Kim S Kimminau, Dinesh Pal Mudaranthakam, Omar Jawdat, Mazen M Dimachkie, Patient Assisted Intervention for Neuropathy: Comparison of Treatment in Real Life Situations (PAIN-CONTRoLS) Study Team, Stanley Iyadurai, Amro Stino, John Kissel, Robert Pascuzzi, Thomas Brannagan, Matthew Wicklund, Aiesha Ahmed, David Walk, Gordon Smith, Dianna Quan, Darryl Heitzman, Alejandro Tobon, Shafeeq Ladha, Gil Wolfe, Michael Pulley, Ghazala Hayat, Yuebing Li, Pariwat Thaisetthawatkul, Richard Lewis, Suur Biliciler, Khema Sharma, Kian Salajegheh, Jaya Trivedi, William Mallonee, Ted Burns, Mark Jacoby, Vera Bril, Tuan Vu, Sindhu Ramchandren, Mark Bazant, Sara Austin, Chafic Karam, Yessar Hussain, Christen Kutz, Paul Twydell, Stephen Scelsa, Hani Kushlaf, James Wymer, Michael Hehir, Noah Kolb, Jeffrey Ralph, Alexandru Barboi, Navin Verma, Moiz Ahmed, Anza Memon, David Saperstein, Jau-Shin Lou, Andrea Swenson, and Tiyonnoh Cash.
• Department of Neurology, The University of Kansas Medical Center, Kansas City.
• JAMA Neurol. 2021 Jan 1; 78 (1): 68-76.

ImportanceCryptogenic sensory polyneuropathy (CSPN) is a common generalized slowly progressive neuropathy, second in prevalence only to diabetic neuropathy. Most patients with CSPN have significant pain. Many medications have been tried for pain reduction in CSPN, including antiepileptics, antidepressants, and sodium channel blockers. There are no comparative studies that identify the most effective medication for pain reduction in CSPN.ObjectiveTo determine which medication (pregabalin, duloxetine, nortriptyline, or mexiletine) is most effective for reducing neuropathic pain and best tolerated in patients with CSPN.Design, Setting, And ParticipantsFrom December 1, 2014, through October 20, 2017, a bayesian adaptive, open-label randomized clinical comparative effectiveness study of pain in 402 participants with CSPN was conducted at 40 neurology care clinics. The trial included response adaptive randomization. Participants were patients with CSPN who were 30 years or older, with a pain score of 4 or greater on a numerical rating scale (range, 0-10, with higher scores indicating a higher level of pain). Participant allocation to 1 of 4 drug groups used the utility function and treatment's sample size for response adaptation randomization. At each interim analysis, a decision was made to continue enrolling (up to 400 participants) or stop the whole trial for success (80% power). Patient engagement was maintained throughout the trial, which helped guide the study and identify ways to communicate and disseminate information. Analysis was performed from December 11, 2015, to January 19, 2018.InterventionsParticipants were randomized to receive nortriptyline (n = 134), duloxetine (n = 126), pregabalin (n = 73), or mexiletine (n = 69).Main Outcomes And MeasuresThe primary outcome was a utility function that was a composite of the efficacy (participant reported pain reduction of ≥50% from baseline to week 12) and quit (participants who discontinued medication) rates.ResultsAmong the 402 participants (213 men [53.0%]; mean [SD] age, 60.1 [13.4] years; 343 White [85.3%]), the utility function of nortriptyline was 0.81 (95% bayesian credible interval [CrI], 0.69-0.93; 34 of 134 [25.4%] efficacious; and 51 of 134 [38.1%] quit), of duloxetine was 0.80 (95% CrI, 0.68-0.92; 29 of 126 [23.0%] efficacious; and 47 of 126 [37.3%] quit), pregabalin was 0.69 (95% CrI, 0.55-0.84; 11 of 73 [15.1%] efficacious; and 31 of 73 [42.5%] quit), and mexiletine was 0.58 (95% CrI, 0.42-0.75; 14 of 69 [20.3%] efficacious; and 40 of 69 [58.0%] quit). The probability each medication yielded the highest utility was 0.52 for nortriptyline, 0.43 for duloxetine, 0.05 for pregabalin, and 0.00 for mexiletine.Conclusions And RelevanceThis study found that, although there was no clearly superior medication, nortriptyline and duloxetine outperformed pregabalin and mexiletine when pain reduction and undesirable adverse effects are combined to a single end point.Trial RegistrationClinicalTrials.gov Identifier: NCT02260388.

25 keywords...

hide…