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| Content Provider | Springer Nature : BioMed Central |
|---|---|
| Author | Chapman, Ann-Marie Schurer, Marieke Weijers, Laure Omar, Amer Lee, Hiba Weidenfeller, Alla Zozulya Ellis, Crispin Sonecha, Shaneil Schneider-Gold, Christiane |
| Abstract | Background Non-dystrophic myotonias (NDMs) comprise muscle chloride and sodium channelopathies due to genetic defects of the CLCN1- and SCN4A-channels. No licensed antimyotonic treatment has been available until approval of mexiletine (NaMuscla®) for adult patients by the EMA in December 2018. This Delphi panel aimed to understand how outcomes of the pivotal phase III Mexiletine study (MYOMEX) translate to real world practice and investigate health resource use, quality of life and the natural history of NDM to support economic modelling and facilitate patient access. Methods Nine clinical experts in treating NDM took part in a two-round Delphi panel. Their knowledge of NDM and previous use of mexiletine as an off-label treatment prior to NaMuscla’s approval ensured they could provide both qualitative context and quantitative estimates to support economic modelling comparing mexiletine (NaMuscla) to best supportive care. Consensus in four key areas was sought: healthcare resource utilization (HRU), treatment with mexiletine (NaMuscla), patient quality of life (QoL), and the natural history of disease. Concept questions were also asked, considering perceptions on the feasibility of mapping the validated Individualized Neuromuscular Quality of Life (INQoL) instrument to the generic EQ-5D™, and the potential impact on caregiver QoL. Results Consensus was achieved for key questions including the average long-term dosage of mexiletine (NaMuscla) in practice, the criteria for eligibility of myotonia treatment, the clinical importance of QoL outcomes in MYOMEX, the higher proportion of patients with increased QoL, and the reduction in the need for mental health resources for patients receiving mexiletine (NaMuscla). While consensus was not achieved for other questions, the results demonstrated that most experts felt mexiletine (NaMuscla) reduced the need for HRU and was expected to improve QoL. The QoL mapping exercise suggested that it is feasible to map domains of INQoL to EQ-5D. Points of interest for future research were identified, including that mexiletine (NaMuscla) may slow the annual decrease in QoL of patients over their lifetime, and a significant negative impact on QoL for some caregivers. Conclusions This project successfully provided data from an informed group of clinical experts, complementing the currently available clinical trial data for mexiletine (NaMuscla) to support patient access decisions. |
| Related Links | https://bmcneurol.biomedcentral.com/counter/pdf/10.1186/s12883-021-02491-3.pdf |
| Ending Page | 16 |
| Page Count | 16 |
| Starting Page | 1 |
| File Format | HTM / HTML |
| ISSN | 14712377 |
| DOI | 10.1186/s12883-021-02491-3 |
| Journal | BMC Neurology |
| Issue Number | 1 |
| Volume Number | 21 |
| Language | English |
| Publisher | BioMed Central |
| Publisher Date | 2021-12-01 |
| Access Restriction | Open |
| Subject Keyword | Neurology Neurochemistry Neurosurgery Non-dystrophic myotonia Delphi panel Mexiletine (NaMuscla) Quality of life Healthcare resource utilisation INQoL EQ-5D |
| Content Type | Text |
| Resource Type | Article |
| Subject | Neurology (clinical) |
| Journal Impact Factor | 2.2/2023 |
| 5-Year Journal Impact Factor | 2.5/2023 |
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