Skip to main content

Advertisement

Log in

Subclinical affective and cognitive fluctuations in Parkinson's disease: a randomized double-blind double-dummy study of Oral vs. Intrajejunal Levodopa

  • Original Communication
  • Published:
Journal of Neurology Aims and scope Submit manuscript

Abstract

Background

Chronic levodopa treatment in Parkinson’s disease (PD) may promote undesirable motor and non-motor fluctuations. Compared to chronic oral levodopa treatment, continuous infusion of levodopa/carbidopa intestinal gel (LCIG) in advanced PD reduces motor fluctuations. However, differences in their effect on acute non-motor changes were not formally demonstrated.

Objective

We performed a randomized, double-blind, double-dummy, crossover study to compare acute non-motor changes between intermittent oral immediate-release carbidopa/levodopa (LC-IR) and LCIG.

Methods

After > 12-h OFF, thirteen PD patients chronically treated with LCIG and without history of non-motor swings, were allocated to receive first, LCIG infusion plus three oral doses of placebo, or placebo infusion plus three oral doses of LC-IR. Over-encapsulated oral medication (LC-IR or placebo) was administered every 2 h. We monitored plasmatic levels of levodopa, motor status (UPDRS-III), mood, anxiety, and frontal functions at baseline (0-h) and hourly after each oral challenge.

Results

Repeated-measures ANOVAs showed significant group by treatment interaction indicating more fluctuations of levodopa plasma levels with LC-IR. No significant interactions were seen in the temporal profile of motor status, anxiety, mood and cognition. However, point-to-point parametric and nonparametric tests showed a significant more marked and more sustained improvement in anxiety scores under LCIG. A significant improvement of mood and verbal fluency was seen a + 3-h only under LCIG.

Discussion

Our sample of advanced PD patients exhibited moderate but significant non-motor fluctuations. LCIG was associated with a more favorable profile of acute affective and cognitive fluctuations that was particularly expressed at the first part of the infusion curve.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Fig. 1
Fig. 2
Fig. 3
Fig. 4

Similar content being viewed by others

References

  1. Olanow CW (2019) Levodopa is the best symptomatic therapy for PD: nothing more, nothing less. Mov Disord 34(6):812–815. https://doi.org/10.1002/mds.27690

    Article  PubMed  Google Scholar 

  2. Verschuur CVM, Suwijn SR, Boel JA, Post B, Bloem BR, van Hilten JJ, van Laar T, Tissingh G, Munts AG, Deuschl G, Lang AE, Dijkgraaf MGW, de Haan RJ, de Bie RMA (2019) Randomized delayed-start trial of levodopa in Parkinson's disease. N Eng J Medi 380(4):315–324. https://doi.org/10.1056/NEJMoa1809983

    Article  CAS  Google Scholar 

  3. Espay AJ, Morgante F, Merola A, Fasano A, Marsili L, Fox SH, Bezard E, Picconi B, Calabresi P, Lang AE (2018) Levodopa-induced dyskinesia in Parkinson disease: current and evolving concepts. Ann Neurol 84(6):797–811. https://doi.org/10.1002/ana.25364

    Article  PubMed  Google Scholar 

  4. Schrag A, Quinn N (2000) Dyskinesias and motor fluctuations in Parkinson's disease. A community-based study. Brain 123(Pt 11):2297–2305. https://doi.org/10.1093/brain/123.11.2297

    Article  PubMed  Google Scholar 

  5. Ahlskog JE, Muenter MD (2001) Frequency of levodopa-related dyskinesias and motor fluctuations as estimated from the cumulative literature. Mov Disord 16(3):448–458. https://doi.org/10.1002/mds.1090

    Article  CAS  PubMed  Google Scholar 

  6. Nutt JG, Chung KA, Holford NH (2010) Dyskinesia and the antiparkinsonian response always temporally coincide: a retrospective study. Neurology 74(15):1191–1197. https://doi.org/10.1212/WNL.0b013e3181d90050

    Article  PubMed  PubMed Central  Google Scholar 

  7. Martinez-Martin P, Rodriguez-Blazquez C, Kurtis MM, Chaudhuri KR (2011) The impact of non-motor symptoms on health-related quality of life of patients with Parkinson's disease. Mov Disord 26(3):399–406. https://doi.org/10.1002/mds.23462

    Article  PubMed  Google Scholar 

  8. Hillen ME, Sage JI (1996) Nonmotor fluctuations in patients with Parkinson's disease. Neurology 47(5):1180–1183. https://doi.org/10.1212/wnl.47.5.1180

    Article  CAS  PubMed  Google Scholar 

  9. Nissenbaum H, Quinn NP, Brown RG, Toone B, Gotham AM, Marsden CD (1987) Mood swings associated with the 'on-off' phenomenon in Parkinson's disease. Psychol Med 17(4):899–904. https://doi.org/10.1017/s0033291700000702

    Article  CAS  PubMed  Google Scholar 

  10. Racette BA, Hartlein JM, Hershey T, Mink JW, Perlmutter JS, Black KJ (2002) Clinical features and comorbidity of mood fluctuations in Parkinson's disease. J Neuropsychiatry Clin Neurosci 14(4):438–442. https://doi.org/10.1176/jnp.14.4.438

    Article  PubMed  Google Scholar 

  11. Riley DE, Lang AE (1993) The spectrum of levodopa-related fluctuations in Parkinson's disease. Neurology 43(8):1459–1464. https://doi.org/10.1212/wnl.43.8.1459

    Article  CAS  PubMed  Google Scholar 

  12. Storch A, Schneider CB, Wolz M, Sturwald Y, Nebe A, Odin P, Mahler A, Fuchs G, Jost WH, Chaudhuri KR, Koch R, Reichmann H, Ebersbach G (2013) Nonmotor fluctuations in Parkinson disease: severity and correlation with motor complications. Neurology 80(9):800–809. https://doi.org/10.1212/WNL.0b013e318285c0ed

    Article  PubMed  Google Scholar 

  13. van der Velden RMJ, Broen MPG, Kuijf ML, Leentjens AFG (2018) Frequency of mood and anxiety fluctuations in Parkinson's disease patients with motor fluctuations: a systematic review. Mov Disord 33(10):1521–1527. https://doi.org/10.1002/mds.27465

    Article  PubMed  Google Scholar 

  14. Witjas T, Kaphan E, Azulay JP, Blin O, Ceccaldi M, Pouget J, Poncet M, Cherif AA (2002) Nonmotor fluctuations in Parkinson's disease: frequent and disabling. Neurology 59(3):408–413. https://doi.org/10.1212/wnl.59.3.408

    Article  PubMed  Google Scholar 

  15. Gallagher DA, Lees AJ, Schrag A (2010) What are the most important nonmotor symptoms in patients with Parkinson's disease and are we missing them? Mov Disord 25(15):2493–2500. https://doi.org/10.1002/mds.23394

    Article  PubMed  Google Scholar 

  16. Kim A, Kim HJ, Shin CW, Kim Y, Jang M, Jung YJ, Lee WW, Park H, Jeon B (2018) Emergence of non-motor fluctuations with reference to motor fluctuations in Parkinson's disease. Parkinsonism Relat Disord 54:79–83. https://doi.org/10.1016/j.parkreldis.2018.04.020

    Article  PubMed  Google Scholar 

  17. Delpont B, Lhommee E, Klinger H, Schmitt E, Bichon A, Fraix V, Castrioto A, Quesada JL, Pelissier P, Kistner A, Carnicella S, Luscher C, Broussolle E, Pollak P, Thobois S, Krack P (2017) Psychostimulant effect of dopaminergic treatment and addictions in Parkinson's disease. Mov Disord 32(11):1566–1573. https://doi.org/10.1002/mds.27101

    Article  CAS  PubMed  Google Scholar 

  18. Vazquez A, Jimenez-Jimenez FJ, Garcia-Ruiz P, Garcia-Urra D (1993) “Panic attacks” in Parkinson’s disease. A long-term complication of levodopa therapy. Acta Neurol Scand 87(1):14–18

    Article  CAS  PubMed  Google Scholar 

  19. Kulisevsky J, Garcia-Sanchez C, Berthier ML, Barbanoj M, Pascual-Sedano B, Gironell A, Estevez-Gonzalez A (2000) Chronic effects of dopaminergic replacement on cognitive function in Parkinson's disease: a two-year follow-up study of previously untreated patients. Mov Disord 15(4):613–626. https://doi.org/10.1002/1531-8257(200007)15:4<613:aid-mds1005>3.0.co;2-f

    Article  CAS  PubMed  Google Scholar 

  20. Martinez-Fernandez R, Schmitt E, Martinez-Martin P, Krack P (2016) The hidden sister of motor fluctuations in Parkinson's disease: a review on nonmotor fluctuations. Mov Disord 31(8):1080–1094. https://doi.org/10.1002/mds.26731

    Article  CAS  PubMed  Google Scholar 

  21. Schmitt E, Krack P, Castrioto A, Klinger H, Bichon A, Lhommee E, Pelissier P, Fraix V, Thobois S, Moro E, Martinez-Martin P (2018) The neuropsychiatric fluctuations scale for Parkinson’s disease: a pilot study. Mov Disord Clin Practice 5(3):265–272. https://doi.org/10.1002/mdc3.12607

    Article  Google Scholar 

  22. Stacy M, Bowron A, Guttman M, Hauser R, Hughes K, Larsen JP, LeWitt P, Oertel W, Quinn N, Sethi K, Stocchi F (2005) Identification of motor and nonmotor wearing-off in Parkinson’s disease: comparison of a patient questionnaire versus a clinician assessment. Mov Disord 20(6):726–733. https://doi.org/10.1002/mds.20383

    Article  PubMed  Google Scholar 

  23. Kulisevsky J, Pascual-Sedano B, Barbanoj M, Gironell A, Pagonabarraga J, Garcia-Sanchez C (2007) Acute effects of immediate and controlled-release levodopa on mood in Parkinson's disease: a double-blind study. Mov Disord 22(1):62–67. https://doi.org/10.1002/mds.21205

    Article  PubMed  Google Scholar 

  24. Maricle RA, Nutt JG, Valentine RJ, Carter JH (1995) Dose-response relationship of levodopa with mood and anxiety in fluctuating Parkinson's disease: a double-blind, placebo-controlled study. Neurology 45(9):1757–1760. https://doi.org/10.1212/wnl.45.9.1757

    Article  CAS  PubMed  Google Scholar 

  25. Richard IH, Frank S, LaDonna KA, Wang H, McDermott MP, Kurlan R (2005) Mood fluctuations in Parkinson's disease: a pilot study comparing the effects of intravenous and oral levodopa administration. Neuropsychiatric Dis Treat 1(3):261–268

    CAS  Google Scholar 

  26. Cools R (2006) Dopaminergic modulation of cognitive function-implications for L-DOPA treatment in Parkinson's disease. Neurosci Biobehav Rev 30(1):1–23. https://doi.org/10.1016/j.neubiorev.2005.03.024

    Article  CAS  PubMed  Google Scholar 

  27. Kulisevsky J (2000) Role of dopamine in learning and memory: implications for the treatment of cognitive dysfunction in patients with Parkinson's disease. Drugs Aging 16(5):365–379. https://doi.org/10.2165/00002512-200016050-00006

    Article  CAS  PubMed  Google Scholar 

  28. Gotham AM, Brown RG, Marsden CD (1988) 'Frontal' cognitive function in patients with Parkinson's disease 'on' and 'off' levodopa. Brain 111(Pt 2):299–321. https://doi.org/10.1093/brain/111.2.299

    Article  PubMed  Google Scholar 

  29. Poewe W, Berger W, Benke T, Schelosky L (1991) High-speed memory scanning in Parkinson's disease: adverse effects of levodopa. Ann Neurol 29(6):670–673. https://doi.org/10.1002/ana.410290616

    Article  CAS  PubMed  Google Scholar 

  30. Swainson R, Rogers RD, Sahakian BJ, Summers BA, Polkey CE, Robbins TW (2000) Probabilistic learning and reversal deficits in patients with Parkinson's disease or frontal or temporal lobe lesions: possible adverse effects of dopaminergic medication. Neuropsychologia 38(5):596–612. https://doi.org/10.1016/s0028-3932(99)00103-7

    Article  CAS  PubMed  Google Scholar 

  31. Kulisevsky J, Avila A, Barbanoj M, Antonijoan R, Berthier ML, Gironell A (1996) Acute effects of levodopa on neuropsychological performance in stable and fluctuating Parkinson's disease patients at different levodopa plasma levels. Brain 119(Pt 6):2121–2132. https://doi.org/10.1093/brain/119.6.2121

    Article  PubMed  Google Scholar 

  32. Cools R, Barker RA, Sahakian BJ, Robbins TW (2001) Enhanced or impaired cognitive function in Parkinson's disease as a function of dopaminergic medication and task demands. Cereb Cortex 11(12):1136–1143. https://doi.org/10.1093/cercor/11.12.1136

    Article  CAS  PubMed  Google Scholar 

  33. MacDonald PA, MacDonald AA, Seergobin KN, Tamjeedi R, Ganjavi H, Provost JS, Monchi O (2011) The effect of dopamine therapy on ventral and dorsal striatum-mediated cognition in Parkinson's disease: support from functional MRI. Brain 134(Pt 5):1447–1463. https://doi.org/10.1093/brain/awr075

    Article  PubMed  Google Scholar 

  34. Pascual-Sedano B, Kulisevsky J, Barbanoj M, Garcia-Sanchez C, Campolongo A, Gironell A, Pagonabarraga J, Gich I (2008) Levodopa and executive performance in Parkinson's disease: a randomized study. J Int Neuropsychol Soc 14(5):832–841. https://doi.org/10.1017/S1355617708081010

    Article  CAS  PubMed  Google Scholar 

  35. Antonini A, Poewe W, Chaudhuri KR, Jech R, Pickut B, Pirtosek Z, Szasz J, Valldeoriola F, Winkler C, Bergmann L, Yegin A, Onuk K, Barch D, Odin P (2017) Levodopa-carbidopa intestinal gel in advanced Parkinson's: final results of the GLORIA registry. Parkinsonism Relat Disord 45:13–20. https://doi.org/10.1016/j.parkreldis.2017.09.018

    Article  PubMed  Google Scholar 

  36. Buongiorno M, Antonelli F, Camara A, Puente V, de Fabregues-Nebot O, Hernandez-Vara J, Calopa M, Pascual-Sedano B, Campolongo A, Valldeoriola F, Tolosa E, Kulisevsky J, Marti MJ (2015) Long-term response to continuous duodenal infusion of levodopa/carbidopa gel in patients with advanced Parkinson disease: the barcelona registry. Parkinsonism Relat Disord 21(8):871–876. https://doi.org/10.1016/j.parkreldis.2015.05.014

    Article  PubMed  Google Scholar 

  37. Lang AE, Rodriguez RL, Boyd JT, Chouinard S, Zadikoff C, Espay AJ, Slevin JT, Fernandez HH, Lew MF, Stein DA, Odin P, Fung VS, Klostermann F, Fasano A, Draganov PV, Schmulewitz N, Robieson WZ, Eaton S, Chatamra K, Benesh JA, Dubow J (2016) Integrated safety of levodopa-carbidopa intestinal gel from prospective clinical trials. Mov Disord 31(4):538–546. https://doi.org/10.1002/mds.26485

    Article  CAS  PubMed  Google Scholar 

  38. Olanow CW, Kieburtz K, Odin P, Espay AJ, Standaert DG, Fernandez HH, Vanagunas A, Othman AA, Widnell KL, Robieson WZ, Pritchett Y, Chatamra K, Benesh J, Lenz RA, Antonini A (2014) Continuous intrajejunal infusion of levodopa-carbidopa intestinal gel for patients with advanced Parkinson's disease: a randomised, controlled, double-blind, double-dummy study. Lancet Neurol 13(2):141–149. https://doi.org/10.1016/S1474-4422(13)70293-X

    Article  CAS  PubMed  Google Scholar 

  39. Lopiano L, Modugno N, Marano P, Sensi M, Meco G, Solla P, Gusmaroli G, Tamma F, Mancini F, Quatrale R, Zangaglia R, Bentivoglio A, Eleopra R, Gualberti G, Melzi G, Antonini A (2019) Motor and non-motor outcomes in patients with advanced Parkinson's disease treated with levodopa/carbidopa intestinal gel: final results of the GREENFIELD observational study. J Neurol 266(9):2164–2176. https://doi.org/10.1007/s00415-019-09337-6

    Article  PubMed  PubMed Central  Google Scholar 

  40. Isacson D, Bingefors K, Kristiansen IS, Nyholm D (2008) Fluctuating functions related to quality of life in advanced Parkinson disease: effects of duodenal levodopa infusion. Acta Neurol Scand 118(6):379–386. https://doi.org/10.1111/j.1600-0404.2008.01049.x

    Article  CAS  PubMed  Google Scholar 

  41. Dafsari HS, Martinez-Martin P, Rizos A, Trost M, Dos Santos Ghilardi MG, Reddy P, Sauerbier A, Petry-Schmelzer JN, Kramberger M, Borgemeester RWK, Barbe MT, Ashkan K, Silverdale M, Evans J, Odin P, Fonoff ET, Fink GR, Henriksen T, Ebersbach G, Pirtosek Z, Visser-Vandewalle V, Antonini A, Timmermann L, Ray Chaudhuri K, Europar, the International P, Movement Disorders Society Non-Motor Parkinson's Disease Study G ( 2019) EuroInf 2: Subthalamic stimulation, apomorphine, and levodopa infusion in Parkinson's disease. Mov Disord 34(3):353–365. https://doi.org/10.1002/mds.27626

    Article  CAS  PubMed  Google Scholar 

  42. Nyholm D, Askmark H, Gomes-Trolin C, Knutson T, Lennernas H, Nystrom C, Aquilonius SM (2003) Optimizing levodopa pharmacokinetics: intestinal infusion versus oral sustained-release tablets. Clin Neuropharmacol 26(3):156–163. https://doi.org/10.1097/00002826-200305000-00010

    Article  CAS  PubMed  Google Scholar 

  43. Othman AA, Rosebraugh M, Chatamra K, Locke C, Dutta S (2017) Levodopa-carbidopa intestinal gel pharmacokinetics: lower variability than oral levodopa-carbidopa. J Parkinson's Dis 7(2):275–278. https://doi.org/10.3233/JPD-161042

    Article  CAS  Google Scholar 

  44. Catalan MJ, Antonini A, Calopa M, Bajenaru O, de Fabregues O, Minguez-Castellanos A, Odin P, Garcia-Moreno JM, Pedersen SW, Pirtosek Z, Kulisevsky J (2017) Can suitable candidates for levodopa/carbidopa intestinal gel therapy be identified using current evidence? eNeurologicalSci 8:44–53. https://doi.org/10.1016/j.ensci.2017.06.004

    Article  PubMed  PubMed Central  Google Scholar 

  45. Volkmann J, Albanese A, Antonini A, Chaudhuri KR, Clarke CE, de Bie RM, Deuschl G, Eggert K, Houeto JL, Kulisevsky J, Nyholm D, Odin P, Ostergaard K, Poewe W, Pollak P, Rabey JM, Rascol O, Ruzicka E, Samuel M, Speelman H, Sydow O, Valldeoriola F, van der Linden C, Oertel W (2013) Selecting deep brain stimulation or infusion therapies in advanced Parkinson's disease: an evidence-based review. J Neurol 260(11):2701–2714. https://doi.org/10.1007/s00415-012-6798-6

    Article  PubMed  PubMed Central  Google Scholar 

  46. Tomlinson CL, Stowe R, Patel S, Rick C, Gray R, Clarke CE (2010) Systematic review of levodopa dose equivalency reporting in Parkinson's disease. Mov Disord 25(15):2649–2653. https://doi.org/10.1002/mds.23429

    Article  PubMed  Google Scholar 

  47. Goetz CG, Tilley BC, Shaftman SR, Stebbins GT, Fahn S, Martinez-Martin P, Poewe W, Sampaio C, Stern MB, Dodel R, Dubois B, Holloway R, Jankovic J, Kulisevsky J, Lang AE, Lees A, Leurgans S, LeWitt PA, Nyenhuis D, Olanow CW, Rascol O, Schrag A, Teresi JA, van Hilten JJ, LaPelle N (2008) Movement Disorder Society-sponsored revision of the Unified Parkinson's Disease Rating Scale (MDS-UPDRS): scale presentation and clinimetric testing results. Mov Disord 23(15):2129–2170. https://doi.org/10.1002/mds.22340

    Article  PubMed  Google Scholar 

  48. Pagonabarraga J, Kulisevsky J, Llebaria G, Garcia-Sanchez C, Pascual-Sedano B, Gironell A (2008) Parkinson's disease-cognitive rating scale: a new cognitive scale specific for Parkinson's disease. Mov Disord 23(7):998–1005. https://doi.org/10.1002/mds.22007

    Article  PubMed  Google Scholar 

  49. Zigmond AS, Snaith RP (1983) The hospital anxiety and depression scale. Acta Psychiatr Scand 67(6):361–370. https://doi.org/10.1111/j.1600-0447.1983.tb09716.x

    Article  CAS  PubMed  Google Scholar 

  50. Starkstein SE, Merello M, Jorge R, Brockman S, Bruce D, Power B (2009) The syndromal validity and nosological position of apathy in Parkinson's disease. Mov Disord 24(8):1211–1216. https://doi.org/10.1002/mds.22577

    Article  PubMed  Google Scholar 

  51. Marras C, Troster AI, Kulisevsky J, Stebbins GT (2014) The tools of the trade: a state of the art "How to Assess Cognition" in the patient with Parkinson's disease. Mov Disord 29(5):584–596. https://doi.org/10.1002/mds.25874

    Article  PubMed  Google Scholar 

  52. Lezak MHD, Bigler E, Tranel D (2012) Neuropsychological assessment. Oxford University Press, Oxford

    Google Scholar 

  53. Sternberg S (1966) High-speed scanning in human memory. Science 153(3736):652–654. https://doi.org/10.1126/science.153.3736.652

    Article  CAS  PubMed  Google Scholar 

  54. Fernandez HH, Standaert DG, Hauser RA, Lang AE, Fung VS, Klostermann F, Lew MF, Odin P, Steiger M, Yakupov EZ, Chouinard S, Suchowersky O, Dubow J, Hall CM, Chatamra K, Robieson WZ, Benesh JA, Espay AJ (2015) Levodopa-carbidopa intestinal gel in advanced Parkinson's disease: final 12-month, open-label results. Mov Disord 30(4):500–509. https://doi.org/10.1002/mds.26123

    Article  CAS  PubMed  Google Scholar 

  55. Black KJ, Hershey T, Hartlein JM, Carl JL, Perlmutter JS (2005) Levodopa challenge neuroimaging of levodopa-related mood fluctuations in Parkinson's disease. Neuropsychopharmacology 30(3):590–601. https://doi.org/10.1038/sj.npp.1300632

    Article  CAS  PubMed  Google Scholar 

  56. Christopher L, Marras C, Duff-Canning S, Koshimori Y, Chen R, Boileau I, Segura B, Monchi O, Lang AE, Rusjan P, Houle S, Strafella AP (2014) Combined insular and striatal dopamine dysfunction are associated with executive deficits in Parkinson's disease with mild cognitive impairment. Brain 137(Pt 2):565–575. https://doi.org/10.1093/brain/awt337

    Article  PubMed  Google Scholar 

Download references

Acknowledgements

We are grateful to all patients and caregivers for their generous participation in the study. This study was partially supported by FIS Grant PI15/00962; Rio Hortega CM17/00209 and CIBERNED (Instituto de Salud Carlos III, Spain); La Marató de TV3, Expedient 20142910, 2014/U/477, and an unrestrictive research grant from Abbvie.

Author information

Authors and Affiliations

Authors

Corresponding author

Correspondence to Jaime Kulisevsky.

Ethics declarations

Conflicts of interest

J Kulisevsky received compensation for consultancy and speaker activities from UCB, AbbVie, Neuroderm, Teva, Roche and Zambon. He received research support from Teva, Zambon, Abbvie, Ciberned and Carlos III Institute Research Grant FIS PI18/0717; S Martinez-Horta received compensation for speaker activities from UCB, AbbVie and Roche. He received research support from the Huntington's Disease Society of America; H Bejr-kasem received compensation for speaker activities in scientific meetings supported by Zambon, and non-financial support for congress attendance from Abbvie, Zambon and Allergan.I Aracil-Bolaños has received research support from Carlos III Institute Research Grant CM19/00156 G; B Pascual-Sedano received compensation for consultancy from Ferrer and speaker activities from AbbVie, UCB and Teva; C Izquierdo received compensation for speaker activities from UCB and Abbvie; A Campolongo received compensation for consultancy and speaker activities from UCB, AbbVie and Teva; J Pagonabarraga has received honoraria as Speaker or as member of Advisory Board from Zambon, UCB, Abbvie, Allergan and Ipsen; J Marín received compensation for consultancy and speaker activities from UCB; J Perez-Perez, O de Fàbregues, V Puente, A Crespo-Cuevas and M Calopa have no conflict of interest to declare.

Ethical standard

The study has been approved by the ethical committee of sant Pau Hospital (Barcelona, Spain). Written informed consent was obtained from all participants and the study was conducted in accordance with the ethical standards laid down in the 1964 Declaration of Helsinki and its later amendments.

Rights and permissions

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Kulisevsky, J., Bejr-Kasem, H., Martinez-Horta, S. et al. Subclinical affective and cognitive fluctuations in Parkinson's disease: a randomized double-blind double-dummy study of Oral vs. Intrajejunal Levodopa. J Neurol 267, 3400–3410 (2020). https://doi.org/10.1007/s00415-020-10018-y

Download citation

  • Received:

  • Revised:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/s00415-020-10018-y

Keywords

Navigation