Condition category
Mental and Behavioural Disorders
Date applied
Date assigned
Last edited
Retrospectively registered
Overall trial status
Recruitment status
No longer recruiting
Publication status

Plain English Summary

Not provided at time of registration

Trial website

Contact information



Primary contact

Prof Charles McCollum


Contact details

Academic Surgery Unit
2nd Floor
Education and Research Centre
University Hospital of South Manchester
Southmoor Road
M23 9LT
United Kingdom
+44 (0)161 291 5853

Additional identifiers

EudraCT number

2005-004283-23 number

Protocol/serial number

Protocol version 1, EudraCT number: 2005-004283-23

Study information

Scientific title

An evaluation of potential therapies to inhibit cerebral emboli in dementia


Study hypothesis

The causes of common dementias such as Alzheimer’s Disease (AD) and Vascular Dementia (VAD), which affect 800,000 people in the UK, remain uncertain. We recently found that both AD and VAD are associated with small particles (emboli) in the circulation to the brain and that patients with these emboli suffer a more rapid progression of dementia. Prior to major clinical trials on whether therapy to inhibit emboli may prevent or treat dementia, we need to study possible therapies that may inhibit these emboli. We plan to compare two therapeutic approaches:
1. Platelet inhibition
2. An anti-inflammatory lipid therapy thought to stabilise arterial disease

Patients will be given no new treatments. The number of emboli in the cerebral circulation measured by non-invasive ultrasound, assessment of brain function and markers of inflammation associated with dementia will be measured before and after 1 month of the trial treatment. Any treatment or combination of treatments that inhibit cerebral emboli will then be investigated further in major clinical trials on the treatment of established dementia or the prevention of dementia in ‘at risk’ elderly people.

Ethics approval

South Manchester Research Ethics Committee, ref: 05/Q1403/214, Amendment number 1 (06/03/2006)

Study design

Randomised controlled clinical trial

Primary study design


Secondary study design

Randomised cross over trial

Trial setting

Not specified

Trial type


Patient information sheet

Not available in web format, please use the contact details to request a patient information sheet


Dementia, Alzheimer's disease and Vascular Dementia


Randomised controlled clinical trial of atorvastatin/clopidogrel/no treatment over 1 month with crossover in 45 patients with Alzheimer's dementia (AD) and 45 with vascular dementia (VaD)

Patients who are already taking aspirin will continue aspirin therapy. No patient will have therapeutic medication withdrawn.

Those with Spontaneous Cerebral Emboli (SCE) will be randomised, stratified for type of dementia, into one of three counterbalanced treatment orders:
1. Clopidogrel; Atorvastatin; No treatment
2. Atorvastatin; No treatment; Clopidogrel
3. No treatment; Clopidogrel; Atorvastatin

Each treatment will last for 1 month, and there is a washout period of 1 week between each treatment. Transcranial Doppler (TCD) measurement of SCE over two separate 1-hour periods on different days in the same week will be repeated after 4 weeks on each therapy.

Intervention type



Not Applicable

Drug names

Atorvastatin, clopidogrel

Primary outcome measure

The number of SCE counted during two separate 1-hour periods of monitoring by TCD (at baseline and following each therapy)

Secondary outcome measures

1. Any change in the inflammatory markers to Interleukin-6 or C-Reactive Protein as a result of 1 month therapy with the trial medications
2. Any change in the measures of cognitive function as a result of 1 month of therapy using the trial medications

Overall trial start date


Overall trial end date


Reason abandoned (if study stopped)


Participant inclusion criteria

1. Dementia: patients must fulfil DSM IV criteria for dementia (Diagnostic and Statistic Manual of Mental Disorders - fourth edition)
2. AD: patients must fulfil the National Institute of Neurological and Communicative Disorders and Stroke-Alzheimer's Disease and Related Disorders Association (NINCDS-ADRDA) criteria
3. VAD: patients must fulfil the National Institute for Neurological and Communicative Disorders and Stroke -Association Internationale pour la Recherche et l'Enseignement en Neurosciences (NINCDS−AIREN) criteria

Participant type


Age group




Target number of participants

90 (45 patients with AD and 45 with VaD)

Total final enrolment


Participant exclusion criteria

1. Patients with a Mini-Mental State Examination (MMSE) score of less than 10 and/or severe aphasia (as the study requires considerable co-operation)
2. Current anticoagulant treatment (may reduce spontaneous emboli)
3. Current clopidogrel treatment
4. Current statin treatment
5. Diagnosed as suffering from Atrial Fibrillation (AF)
6. Diagnosed with significant liver disease: a liver function test will be carried out if liver disease is clinically indicated in any participants
7. Diagnosed with active pathological bleeding such as peptic ulcer or intracranial haemorrhage
8. Any surgery scheduled during study involvement
9. Baseline coagulation parameters suggest unsuitability for clopidogrel/atorvastatin treatment

Recruitment start date


Recruitment end date



Countries of recruitment

United Kingdom

Trial participating centre

University Hospital of South Manchester
M23 9LT
United Kingdom

Sponsor information


University Hospital of South Manchester (UK)

Sponsor details

c/o Dr Andrew Maines
Research and Development Directorate
Ground Floor
Education and Research Centre
University Hospital of South Manchester
Southmoor Road
M23 9LT
United Kingdom
+44 (0)161 291 5775

Sponsor type

Hospital/treatment centre



Funder type


Funder name

Alzheimer's Society (UK) (grant ref: 87 [30 January 2007])

Alternative name(s)

Funding Body Type

private sector organisation

Funding Body Subtype

Associations and societies (private and public)


United Kingdom

Results and Publications

Publication and dissemination plan

Not provided at time of registration

Intention to publish date

Participant level data

Not provided at time of registration

Basic results (scientific) (added 23/06/2020)

Publication list

Publication citations

Additional files

Editorial Notes

23/06/2020: The following changes were made to the trial record: 1. Added link to basic results (scientific). 2. The total final enrollment was added. 21/03/2017: No publications found, verifying study status with principal investigator.