Kai Ivar Müller

• Jensen, Synnøve M; Friborg, Oddgeir; Mellgren, Svein Ivar; Müller, Kai Ivar; Bergvik, Svein Hugo & Arntzen, Kjell Arne (2024). Health-Related Quality of Life in FKRP-Related Limb-Girdle Muscular Dystrophy R9. Journal of Neuromuscular Diseases. ISSN 2214-3599. 11(1), p. 59–74. doi: 10.3233/JND-221629.
• Jensen, Synnøve; Abeler, Karin Louise; Friborg, Oddgeir; Rösner, Assami; Olsborg, Caroline & Mellgren, Svein Ivar [Show all 10 contributors for this article] (2023). Insomnia and sleep-disordered breathing in FKRP-related limb-girdle muscular dystrophy R9. The Norwegian LGMDR9 cohort study (2020). Journal of Neurology. ISSN 0340-5354. doi: 10.1007/s00415-023-11978-7. Full text in Research Archive
• Gravdahl, Gøril Bruvik; Aakerøy, Lars; Stovner, Lars Jacob; Engstrøm, Morten; Müller, Kai Ivar & Bjørk, Marte-Helene [Show all 7 contributors for this article] (2023). Continuous positive airway pressure in cluster headache: A randomized, placebo-controlled, triple-blind, crossover study. Cephalalgia. ISSN 0333-1024. 43(1), p. 1–10. doi: 10.1177/03331024221128273. Full text in Research Archive
• Jensen, Synnøve; Müller, Kai Ivar; Mellgren, Svein Ivar; Bindoff, Laurence Albert; Rasmussen, Magnhild & Ørstavik, Kristin [Show all 11 contributors for this article] (2022). Epidemiology and natural history in 101 subjects with FKRP-related limb-girdle muscular dystrophy R9. The Norwegian LGMDR9 cohort study (2020). Neuromuscular Disorders. ISSN 0960-8966. 33(2), p. 119–132. doi: 10.1016/j.nmd.2022.11.005. Full text in Research Archive Show summary

  We aimed to investigate the epidemiology and natural history of FKRP-related limb-girdle muscular dystrophy R9 (LGMDR9) in Norway. We identified 153 genetically confirmed subjects making the overall prevalence 2.84/100,000, the highest reported figure worldwide. Of the 153 subjects, 134 (88 %) were homozygous for FKRP c.826C>A giving a carrier frequency for this variant of 1/101 in Norway. Clinical questionnaires and patient notes from 101 subjects, including 88 c.826C>A homozygotes, were reviewed, and 43/101 subjects examined clinically. Age of onset in c.826C>A homozygotes demonstrated a bimodal distribution. Female subjects showed an increased cumulative probability of wheelchair dependency and need for ventilatory support. Across the cohort, the need for ventilatory support preceded wheelchair dependency in one third of the cases, usually due to sleep apnea. In c.826C>A homozygotes, occurrence of cardiomyopathy correlated positively with male gender but not with age or disease stage. This study highlights novel gender differences in both loss of ambulation, need for ventilatory support and the development of cardiomyopathy. Our results confirm the need for vigilance in order to detect respiratory insufficiency and cardiac involvement, but indicate that these events affect males and females differently.

• Clausen, Tobias Christian; Greve, Nikolaos Kalogeropoulos; Müller, Kai Ivar; Kristoffersen, Espen Saxhaug & Schytz, Henrik Winther (2022). Telemedicine in headache care: A systematic review. Cephalalgia. ISSN 0333-1024. 42(13), p. 1397–1408. doi: 10.1177/03331024221111554.
• Bekkelund, Svein Ivar & Müller, Kai Ivar (2021). One-Year Remission Rate of Chronic Headache Comparing Video and Face-to-Face Consultations by Neurologist: Randomized Controlled Trial. Journal of Medical Internet Research. ISSN 1438-8871. 23(12). doi: 10.2196/30151. Full text in Research Archive
• Müller, Kai Ivar; Nilssen, Øivind; Nebuchenykh, Maria; Løseth, Sissel; Jonsrud, Christoffer & Hoem, Gry [Show all 8 contributors for this article] (2021). Kennedy disease in two sisters with biallelic CAG expansions of the androgen receptor gene. Neuromuscular Disorders. ISSN 0960-8966. p. 1–5. doi: 10.1016/j.nmd.2021.11.007. Full text in Research Archive
• Müller, Kai Ivar; Van Ghelue, Marijke; Lund, Irene; Jonsrud, Christoffer & Arntzen, Kjell Arne (2020). The prevalence of hereditary neuromuscular disorders in Northern Norway. Brain and Behavior. ISSN 2162-3279. doi: 10.1002/brb3.1948. Full text in Research Archive
• Alstadhaug, Karl Bjørnar; Ofte, Hilde Karen; Müller, Kai Ivar & Andreou, Anna P. (2020). Sudden caffeine withdrawal triggers migraine—A randomized controlled trial. Frontiers in Neurology. ISSN 1664-2295. 11:1102, p. 1–7. doi: 10.3389/fneur.2020.01002. Full text in Research Archive
• Smeland, Marie Falkenberg; McClenaghan, Conor; Roessler, Helen I.; Savelberg, Sanne; Hansen, Geir Åsmund Myge & Hjellnes, Helene [Show all 25 contributors for this article] (2019). ABCC9-related intellectual disability myopathy syndrome is a KATP channelopathy with loss-of-function mutations in ABCC9. Nature Communications. ISSN 2041-1723. 10:4457, p. 1–19. doi: 10.1038/s41467-019-12428-7. Full text in Research Archive
• Bekkelund, Svein Ivar & Müller, Kai Ivar (2019). Video consultations in medication overuse headache. A randomized controlled trial. Brain and Behavior. ISSN 2162-3279. 9(7), p. 1–8. doi: 10.1002/brb3.1344. Full text in Research Archive
• Bekkelund, Svein Ivar; Müller, Kai Ivar; Wilhelmsen, Aleksander & Alstadhaug, Karl Bjørnar (2017). Photophobia and seasonal variation of migraine in a subarctic population. Headache. ISSN 0017-8748. 57(8), p. 1206–1216. doi: 10.1111/head.13131.
• Fladby, Tormod; Pålhaugen, Lene; Selnes, Per; Waterloo, Knut; Bråthen, Geir & Hessen, Erik [Show all 27 contributors for this article] (2017). Detecting at-risk Alzheimer's disease cases. Journal of Alzheimer's Disease. ISSN 1387-2877. 60(1), p. 97–105. doi: 10.3233/JAD-170231.
• Müller, Kai Ivar; Alstadhaug, Karl Bjørnar & Bekkelund, Svein Ivar (2017). A randomized trial of telemedicine efficacy and safety for nonacute headaches. Neurology. ISSN 0028-3878. 89(2), p. 153–162. doi: 10.1212/WNL.0000000000004085. Full text in Research Archive
• Müller, Kai Ivar; Alstadhaug, Karl Bjørnar & Bekkelund, Svein Ivar (2017). Headache patients' satisfaction with telemedicine: a 12-month follow-up randomized non-inferiority trial. European Journal of Neurology. ISSN 1351-5101. 24(6), p. 807–815. doi: 10.1111/ene.13294. Full text in Research Archive
• Popperud, Trine Haug; Boldingh, Marion; Brunborg, Cathrine; Faiz, Kashif Waqar; Heldal, Anne Taraldsen & Maniaol, Angelina [Show all 10 contributors for this article] (2017). Juvenile myasthenia gravis in Norway: A nationwide epidemiological study. European journal of paediatric neurology. ISSN 1090-3798. 21(2), p. 312–317. doi: 10.1016/j.ejpn.2016.09.001.
• Müller, Kai Ivar; Alstadhaug, Karl Bjørnar & Bekkelund, Svein Ivar (2016). Telemedicine in the management of non-acute headaches: A prospective,open-labelled non-inferiority,randomised clinical trial. Cephalalgia. ISSN 0333-1024. 37(9), p. 855–863. doi: 10.1177/0333102416654885.
• Müller, Kai Ivar; Alstadhaug, Karl Bjørnar & Bekkelund, Svein Ivar (2016). Acceptability, feasibility, and cost of telemedicine for nonacute headaches: A randomized study comparing video and traditional consultations. Journal of Medical Internet Research. ISSN 1438-8871. 18(5). doi: 10.2196/jmir.5221. Full text in Research Archive
• Müller, Kai Ivar; Devik, Kristina; Vorren, Torgrim & Johnsen, Stein Harald (2013). En mann i 60-årene med brystsmerter og pareser. Tidsskrift for Den norske legeforening. ISSN 0029-2001. 133(12-13), p. 1320–1324. doi: 10.4045/tidsskr.12.0979.
• Müller, Kai Ivar & Bekkelund, Svein Ivar (2013). Visual impairment and posterior cortical atrophy preceding rapid progressive dementia. BMJ Case Reports. ISSN 1757-790X. doi: 10.1136/bcr-2012-007624.
• Müller, Kai Ivar & Bekkelund, Svein Ivar (2011). Hemicrania Continua Changed to Chronic Paroxysmal Hemicrania After Treatment With Cyclooxygenase-2 Inhibitor. Headache. ISSN 0017-8748. 51(2), p. 300–305. doi: 10.1111/j.1526-4610.2010.01820.x.

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• Müller, Kai Ivar; Van Ghelue, Marijke; Jonsrud, Christoffer & Arntzen, Kjell Arne (2020). The prevalence of inherited neuromuscular disorders in Northern Norway.
• Roland, Sissel Breivold; Kvarstein, Gunnvald; Aslaksen, Per M; Anke, Audny; Müller, Kai Ivar & Vangberg, Torgil Riise (2018). Effekt av spesifikk rehabilitering ved nakkehodepine, med samtidig kartlegging av strukturelle endringer og konnektivitet i hjernen.
• Müller, Kai Ivar & Bekkelund, Svein Ivar (2011). Vitamin E deficiency, ataxia and epilepsy in a Norwegian patient. Journal of Neurology. ISSN 0340-5354. 258, p. 218–218.
• Müller, Kai Ivar & Bekkelund, Svein Ivar (2010). A case of hemicrania continua transformed to chronic paroxysmal hemicrania. Journal of Neurology. ISSN 0340-5354. 257, p. S100–S100.

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