tDCS in Parkinson's Disease With Depression
tDCS in Parkinson's Disease With Depression
Parkinson's disease (PD) is a progressive neurological disease that has effects on both
 movement and mental health. One of the most common mental health complications of PD is
 depression. Up to 30% of Parkinson's patients will experience depression at some point. We
 aim to investigate whether transcranial direct current stimulation (tDCS), a type of
 electrical stimulation for the brain, can improve depression in PD as well as improve motor
 function in PD.
The purpose of this double-blind, randomized control design study is to investigate the
 efficacy of 15-sessions of tDCS (versus 15-sessions of sham tDCS) to treat depression in PD.
 We will also assess dopamine function in a smaller cohort of participants before and after
 their 15 sessions of tDCS by using PET scanning.
Inclusion Criteria:

 1. are outpatients,

 2. are voluntary and competent to consent to treatment,

 3. have a Mini-International Neuropsychiatric Interview (MINI) confirmed diagnosis of
 major depressive disorder (MDD),

 4. have a diagnosis of PD according to the UK PD brain bank criteria,

 5. are 19 years of age or more,

 6. have a score > 13 on the Beck Depression Inventory-II (BDI-II),

 7. still have depressive symptoms after 6 weeks or more of antidepressant (SSRI)
 medication treatment (and on a stabilized dose of at least 4 weeks),

 8. are able to adhere to the treatment schedule,

 9. are proficient in written and verbal English.

 Exclusion Criteria:

 1. have a history of substance dependence or abuse within the last 6 months,

 2. have a concomitant significant unstable medical illness,

 3. have active suicidal intent,

 4. have any history of seizure or medication-resistant epilepsy in the family,

 5. have a lifetime Mini-International Neuropsychiatric Interview (MINI) diagnosis of
 bipolar I or II disorder, schizophrenia, schizoaffective disorder, schizophreniform
 disorder, delusional disorder, or current psychotic symptoms

 6. have a MINI diagnosis of obsessive compulsive disorder, post-traumatic stress disorder
 (current or within the last year), anxiety disorder (generalized anxiety disorder,
 social anxiety disorder, panic disorder), or dysthymia, assessed by a study
 investigator to be primary and causing greater impairment than MDD,

 7. have failed a course of ECT in the current episode or previous episode,

 8. have received tDCS or other neurostimulation therapy for any previous indication due
 to the potential compromise of expectancy effects,

 9. have any significant neurological disorder or insult including, but not limited to:
 any condition likely to be associated with increased intracranial pressure, space
 occupying brain lesion, any history of seizure except those therapeutically induced by
 ECT, cerebral aneurysm, Huntington's chorea, multiple sclerosis, significant head
 trauma with loss of consciousness for greater than or equal to 5 minutes, or
 developmental disorder,

 10. have an intracranial implant (e.g., aneurysm clips, shunts, stimulators, cochlear
 implants, or electrodes) or any other metal object within or near the head, excluding
 the mouth, that cannot be safely removed,

 11. are taking a non-SSRI antidepressant medication,

 12. are pregnant (women of childbearing age only).

 Exclusion Criteria for PET:

 1. unable to tolerate staying off anti-parkinsonian medication for 12-18 hours pre-PET
 scan,

 2. have a history of radiation therapy treatment or other high amounts of radiation.

 Exclusion Criteria for MRI:

 -  Artificial heart valve;

 -  Brain aneurysm clip;

 -  Electrical stimulator for nerves or bones;

 -  Ear or eye implant;

 -  Implanted drug infusion pump;

 -  Coil, catheter, or filter in any blood vessel;

 -  Orthopedic hardware (artificial joint, plate, screws);

 -  Other metallic prostheses;

 -  Shrapnel, bullets, or other metal fragments;

 -  Surgery or tattoos (including tattooed eyeliner) in the last six weeks.