Apathy, Mild Cognitive Impairment
Conditions
Keywords
Mild Cognitive Impairment, apathy, executive function
Brief summary
Mild cognitive impairment (MCI) is a precursor of dementia. Apathy, a profound loss of motivation, is a common behavioral problem in MCI. Presence of apathy may increase the chance of MCI patients converting to Alzheimer's Dementia. Repetitive Transcranial Magnetic Stimulation (rTMS), a non-invasive tool, has been recently approved for treatment of refractory depression. Since dysfunction in the frontal lobe of the brain is seen in patients with apathy, rTMS to the frontal lobe might be helpful in treating the same. Study hypotheses include that rTMS to the dorsolateral prefrontal cortex (DLPFC) will improve apathy and executive function better than sham treatment in those with MCI
Detailed description
Objective: Mild cognitive impairment (MCI) is a precursor of dementia. Apathy, a profound loss of motivation, is a common behavioral problem in MCI. Presence of apathy may increase the chance of MCI patients converting to Alzheimer's Dementia. Repetitive Transcranial Magnetic Stimulation (rTMS), a non-invasive tool, has been recently approved for treatment of refractory depression. Since dysfunction in the frontal lobe of the brain is seen in patients with apathy, rTMS to the frontal lobe might be helpful in treating the same. Specific Aims: * To determine the efficacy of rTMS to the dorsolateral prefrontal cortex (DLPFC) in treating apathy in MCI in comparison to sham treatment. * To compare the efficacy of rTMS to the DLPFC on executive function in MCI in comparison to sham treatment. Research Plan: Current study is a randomized sham controlled cross-over study of daily rTMS. Methods: 20 subjects with MCI and apathy will be enrolled to randomize 8 to a total of 20 sessions of treatment (2 weeks sham, 2 weeks rTMS, with 4 weeks of washout period). Subjects will be randomly assigned to rTMS or sham treatment after consent. After 2 weeks of treatment there will be a 4 week period with no treatment. At the end of the 4-week wash out period, subjects will be crossed over to the next treatment arm (i.e. those who received rTMS in the beginning will receive sham treatment and vice versa). Subjects will be followed for four additional weeks after treatment. Apathy will be assessed using the Apathy Evaluation Scale. Memory, executive function, functional status and caregiver burden will be assessed.
Interventions
The active procedure will stimulate at 120% motor threshold for 4 seconds at a frequency of 10 Hz, with an inter-train interval of 26 seconds for a total of 3,000 pulses. 10 treatment sessions are given over a two week period.
Sponsors
Central Arkansas Veterans Healthcare System
Study design
Allocation
RANDOMIZED
Intervention model
CROSSOVER
Primary purpose
TREATMENT
Masking
QUADRUPLE (Subject, Caregiver, Investigator, Outcomes Assessor)
Eligibility
Sex/Gender
ALL
Age
55 Years to 91 Years
Healthy volunteers
No
Inclusion criteria
1. Subjects age ≥ 55 years, 2. Subjects meeting Petersen's criteria for MCI, 3. Apathy Evaluation Scale-Clinician (AES-C) score of ≥ 30, 4. Mini Mentla Status Examination (MMSE) ≥ 23, 5. Subjects who clear the TMS adult safety scale (TASS) 6. On stable dose of antidepressants (if applicable) for at least two months
Exclusion criteria
1. Subjects taking medications known to increase the risk of seizures from the 2012 Beers criteria: Bupropion, chlorpromazine, clozapine, maprotiline, olanzapine, thioridazine, thiothixene, and tramadol. 2. Subjects taking medications known to increase seizure threshold not listed in the Beers criteria but in the opinion of PI increase seizure threshold: tricyclic antidepressants, theophylline, methylphenidate, and high-dose thyroid supplementation. 3. Subjects taking ototoxic medications: Aminoglycosides, Cisplatin. 4. Subjects in current episode of major depression 5. History of bipolar disorder 6. Subjects with history of seizure or first degree relative with seizure disorder 7. Subjects with implanted device: wearable or implantable cardioverter defibrillators, conductive, ferromagnetic, or other magnetic sensitive metals that are implanted or are non-removable within 30 cm of the treatment coil or those with cochlear implants 8. Subjects with diagnosis of current alcohol related problems 9. Subjects with history of stroke , aneurysm, or cranial neurosurgery 10. Any condition that in the opinion of the study physician is likely to compromise their ability to safely participate in the study
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Apathy Evaluation Scale (AES) | 8 weeks | AES is an 18-item scale that assesses apathy in behavioral, cognitive and emotional domains over the previous four weeks. |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Trials making test | 8 weeks | Widely used test for assessment of executive function. |
Other
| Measure | Time frame | Description |
|---|---|---|
| Exit 25 | 8 weeks | EXIT-25 is a bedside measure of executive function. It defines the behavioral sequelae of executive dyscontrol and provides a standardized clinical encounter in which they can be observed. |
Countries
United States
Outcome results
None listed