A Study of Efficacy and Safety of Idebenone Vs. Placebo in Prodromal Parkinson Disease

A Study of Efficacy and Safety of Idebenone Vs. Placebo in Prodromal Parkinson Disease (SEASEiPPD)

To investigate whether 24 months of idebenone may reduce the progression from Prodromal Parkinson disease (PPD) to Parkinson disease (PD).

Number of people suffered from Parkinson disease (PD) is increasing every year. Contemporary medication has little neuroprotective effect, which may due to delayed treatment as over 50% neurons have lost when clinical diagnosed PD emerges. The concept of Prodromal Parkinson disease (PPD) is emphasized as it has become evident that there are several risk and clinical markers may occur years before the cardinal motor symptoms which allow clinical diagnosis. Rapid eye movement (REM) sleep behavior disorder and olfactory dysfunction are the most common PPD, and more than one third of patients may progress to PD and other neurodegenerative diseases. Mitochondrial injury is one of the pathogenesis of PD. Thus we design this trial to investigate whether idebenone, potent coenzyme Q10 analogue, could protect PPD develops into PD.

Inclusion Criteria:

• Subjects are voluntary to participate and have signed informed consent
• Diagnosed as Rapid Eye movement (REM) Sleep Behavior Disorder by polysomnography

Exclusion Criteria:

• Subjects are pregnant, breastfeeding, or want to get pregnant or breastfeeding in 2 years
• Subjects have history of allergy to idebenone
• Difficulty to communicate
• Suffering from neurodegenerative diseases
• Having obvious brain imaging abnormalities (eg. severe brain atrophy, malformation, softening lesions, cerebrovascular disease, intracranial occupancy, giant large benign lesions, etc.)
• Having severe mental illness (eg. schizophrenia, manic depression, and severe depression)
• Long-term use of clonidine, dopamine antagonists, and serotonin reuptake inhibitors
• Suffering from other severe medical conditions
• Having difficulty in moving and are unable to come to the hospital
• Having claustrophobia
• Having contraindications to MRI tests
• Having history of olfactory disorders greater than 10 years
• Having history of color vision disorders greater than 10 years
• Life expectancy less than 2 years
• Having other situations which researchers consider is inappropriate to participate in this study