Implantable Vagus Nerve Stimulation Modulation of Coeruleus-Norepinephrine Network for Mild-Moderate AD Patients

Not Applicable

Not yet recruiting

• Conditions: Alzheimer Disease
• Interventions: Procedure: Vagus Nerve Stimulation Modulation of the Coeruleus-Norepinephrine Network

• Registration Number: NCT05575271
• Lead Sponsor: Xuanwu Hospital, Beijing

Brief Summary

A randomized controlled clinical study will be conducted in Xuanwu Hospital of Capital Medical University. This study initially explore the effect of selective vagus nerve(C fiber) stimulation on mild-to-moderate AD patients, in order to regulate the activity of the locus coeruleus-norepinephrine network, and to observe the improvement of cognitive function and memory function. We aim to evaluate the efficacy and safety of minimally invasive selective vagus nerve stimulation in the treatment of mild-to-moderate AD patients, to clarify the effective mechanism, and to provide an effective clinical treatment strategy.

Detailed Description

This project plans to recruit 6 patients with Mild-Moderate Alzheimer's disease. They were randomly divided into vagus nerve active stimulation group and sham stimulation group, to receive vagus nerve stimulator implantation.

2 weeks after implantation, the active group will start the treatment for 12 weeks, and the stimulator of the shame group will be turned off for 12 weeks.

Before treatment, cognitive assessment, head MRI and PET examination of norepinephrine distribution were completed.

Side effects and adverse events were assessed at 6 weeks, 10 weeks, and 14 weeks, and cognitive assessment, head MRI and PET examination of norepinephrine distribution was also performed at the 14th week, Then, the true stimulation group continued to be turned on for 12 weeks, and the sham group turned on the stimulator to start the treatment for 12 weeks. cognitive assessment, head MRI and PET examination of norepinephrine distribution were also performed at 26 weeks.

Study Timeline

• Study First Submitted: 2022-07-14
• Status Verified: 2022-10
• Study First Submitted QC: 2022-10-09
• Last Update Submitted: 2022-10-09
• Study First Posted: 2022-10-12
• Last Update Posted: 2022-10-12
• Study Start: 2022-11-01
• Primary Completion: 2026-09-01
• Study Completion: 2026-12-31

Recruitment & Eligibility

• Status: NOT_YET_RECRUITING
• Sex: All
• Target Recruitment: 6

Inclusion Criteria

1. Referring to the NIA-AA clinical AD diagnostic criteria formulated by 2011 National Institute on Aging (NIA) and Alzheimer's Disease Association (ADA) groups, select mild to moderate AD patients with positive amyloid PET;
2. Male or female AD patients between the ages of 50-85;
3. Neuropsychological evaluation reaches the following standards: MMSE 16-24 points, CDR 0.5-2 points;
4. Patients who receives a stable cholinesterase inhibitor regimen continues the oral drug with the same dose for at least 8 weeks before entering the study
5. The patient has sufficient proficiency in Mandarin Chinese and is able to complete the cognitive assessment form;
6. Those who voluntarily accept the test and sign an informed consent form.

Exclusion Criteria

1. There is a clear history of cerebrovascular stroke, and there are clear symptoms or signs of neurological deficit at the time of onset, and there are corresponding responsible lesions left on neuroimaging;
2. Those with a history of alcoholism, or drug addiction, or neurological diseases that can cause cognitive impairment, such as traumatic brain injury, epilepsy, encephalitis, normal intracranial pressure hydrocephalus;
3. Suffering from systemic diseases that may lead to cognitive impairment (such as liver and kidney insufficiency, endocrine diseases, vitamin deficiency);
4. Suffering from cardiac conductive dysfunction (bradycardia) or sleep apnea syndrome;
5. Participating in other drug clinical trials;
6. There are contraindications to head MRI.
7. Those who are deemed unsuitable to participate the trial by the investigator.

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
Sham stimulation	Vagus Nerve Stimulation Modulation of the Coeruleus-Norepinephrine Network	2 weeks after the operation, the stimulator will be turned off for 12 weeks. Then the stimulator will be turned on for 12 weeks. The initial parameters of the program is set as: current 0.20mA, pulse width 500us, frequency 20Hz, stimulation time 30s, interval time 5min. A dynamic program control will be started at a speed of 0.20 mA, and the stimulation intensity will be controlled with the range of 0.4- 0.8mA.
Vagus nerve stimulation	Vagus Nerve Stimulation Modulation of the Coeruleus-Norepinephrine Network	The stimulator will be activated 2 weeks after the operation and continue for 24 weeks. The initial parameters of the program is set as: current 0.20mA, pulse width 500us, frequency 20Hz, stimulation time 30s, interval time 5min. A dynamic program control will be started at a speed of 0.20 mA, and the stimulation intensity will be controlled with the range of 0.4- 0.8mA.

Primary Outcome Measures

Name	Time	Method
Alzheimer's Disease Assessment Scale-Cognitive Subscale (ADAS-Cog)	26 weeks	To evaluate the improvement of the cognitive state of AD patients

Secondary Outcome Measures

Name	Time	Method
Clinical dementia rating(CDR)	26 weeks	To evaluate the improvement of the cognitive state of AD patients
World Health Organization-University of California-Los Angeles Auditory Verbal Learning Test (WHO-UCLA AVLT)	26 weeks	To evaluate the improvement of the cognitive state of AD patients
Neuropsychiatric Inventory(NPI)	26 weeks	To assess the improvement of common behaviors associated with dementia
Montreal cognitive assessment(MoCA)	26 weeks	To evaluate the improvement of the cognitive state of AD patients
Digit Span Test	26 weeks	To evaluate the improvement of the cognitive state of AD patients
The norepinephrine transporter PET(NET-PET)	26 weeks	To evaluate the change of norepinephrine distribution of the brain
Global Deterioration Scale(GDS)	26 weeks	To evaluate the improvement of the cognitive state of AD patients.The Global Deterioration Scale (GDS), developed by Dr. Barry Reisberg, provides caregivers an overview of the stages of cognitive function for those suffering from a primary degenerative dementia such as Alzheimer's disease. It is broken down into 7 different stages. Stages 1-3 are the pre-dementia stages. Stages 4-7 are the dementia stages. Biginning in stage 5, an individual can no longer survive without assistance.
Mini-mental state examination	26 weeks	To evaluate the improvement of the cognitive state of AD patients. The scale consists of 20 questions with a total of 30 items, involving five aspects of orientation, memory, attention and calculation, recall, and language. It can be used as a screening examination and evaluation method for patients with moderate or severe dementia.
Trail making test(TMT)	26 weeks	To evaluate the improvement of the cognitive state of AD patients
Boston naming test(BNT)	26 weeks	To evaluate the improvement of the cognitive state of AD patients
Clock-drawing test	26 weeks	To evaluate the improvement of the cognitive state of AD patients
Modified hachinski ischemic score	26 weeks	The modified Hachinski ischaemic scale is an attempt to differentiate Alzheimer's type dementia and multi-infarct dementia.A score of 2 or less are typical of a patient with Alzheimer's disease. A score of greater than 2 is typical of multi-infarct dementia.
Sturcture MRI	26 weeks	To evaluate the morphologic change of locus coeruleus
Functional MRI and Diffussion Tensor Imaging	26 weeks	To evaluate the brain connectivity change
Event related potential measured by electroencephalogram	26 weeks	To evaluate the improvement of the working memory

Trial Locations

Locations (1)

Xuanwu Hospital, Capital Medical University.; 🇨🇳 Beijing, China