Practice guideline update summary: Mild cognitive impairment
Report of the Guideline Development, Dissemination, and Implementation Subcommittee of the American Academy of Neurology
Abstract
Objective
To update the 2001 American Academy of Neurology (AAN) guideline on mild cognitive impairment (MCI).
Methods
The guideline panel systematically reviewed MCI prevalence, prognosis, and treatment articles according to AAN evidence classification criteria, and based recommendations on evidence and modified Delphi consensus.
Results
MCI prevalence was 6.7% for ages 60–64, 8.4% for 65–69, 10.1% for 70–74, 14.8% for 75–79, and 25.2% for 80–84. Cumulative dementia incidence was 14.9% in individuals with MCI older than age 65 years followed for 2 years. No high-quality evidence exists to support pharmacologic treatments for MCI. In patients with MCI, exercise training (6 months) is likely to improve cognitive measures and cognitive training may improve cognitive measures.
Major recommendations
Clinicians should assess for MCI with validated tools in appropriate scenarios (Level B). Clinicians should evaluate patients with MCI for modifiable risk factors, assess for functional impairment, and assess for and treat behavioral/neuropsychiatric symptoms (Level B). Clinicians should monitor cognitive status of patients with MCI over time (Level B). Cognitively impairing medications should be discontinued where possible and behavioral symptoms treated (Level B). Clinicians may choose not to offer cholinesterase inhibitors (Level B); if offering, they must first discuss lack of evidence (Level A). Clinicians should recommend regular exercise (Level B). Clinicians may recommend cognitive training (Level C). Clinicians should discuss diagnosis, prognosis, long-term planning, and the lack of effective medicine options (Level B), and may discuss biomarker research with patients with MCI and families (Level C).
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Disclaimer
Clinical practice guidelines, practice advisories, systematic reviews, and other guidance published by the American Academy of Neurology (AAN) and its affiliates are assessments of current scientific and clinical information provided as an educational service. The information (1) should not be considered inclusive of all proper treatments, methods of care, or as a statement of the standard of care; (2) is not continually updated and may not reflect the most recent evidence (new evidence may emerge between the time information is developed and when it is published or read); (3) addresses only the question(s) specifically identified; (4) does not mandate any particular course of medical care; and (5) is not intended to substitute for the independent professional judgment of the treating provider, as the information does not account for individual variation among patients. In all cases, the selected course of action should be considered by the treating provider in the context of treating the individual patient. Use of the information is voluntary. The AAN provides this information on an “as is” basis and makes no warranty, expressed or implied, regarding the information. The AAN specifically disclaims any warranties of merchantability or fitness for a particular use or purpose. The AAN assumes no responsibility for any injury or damage to persons or property arising out of or related to any use of this information or for any errors or omissions.
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Information & Authors
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Published In
Copyright
Copyright © 2017 American Academy of Neurology.
Publication History
Received: February 24, 2017
Accepted: September 22, 2017
Published online: December 27, 2017
Published in print: January 16, 2018
Authors
Author Contributions
Dr. Petersen: study concept and design, acquisition of data, analysis or interpretation of data, drafting/revising the manuscript, critical revision of the manuscript for important intellectual content, study supervision. Dr. Lopez: study concept and design, analysis or interpretation of data, drafting/revising the manuscript, critical revision of the manuscript for important intellectual content. Dr. Armstrong: analysis or interpretation of data, drafting/revising the manuscript, critical revision of the manuscript for important intellectual content, study supervision. T.S.D. Getchius: study concept and design, study supervision. Dr. Ganguli: study concept and design, analysis or interpretation of data, drafting/revising the manuscript, critical revision of the manuscript for important intellectual content. Dr. Gloss: analysis or interpretation of data, study supervision. Dr. Gronseth: analysis or interpretation of data. Dr. Marson: study concept and design, analysis or interpretation of data, drafting/revising the manuscript, critical revision of the manuscript for important intellectual content. Dr. Pringsheim: analysis and interpretation of data, study supervision. Dr. Day: analysis and interpretation of data, study supervision. Dr. Sager: study concept and design, analysis or interpretation of data, critical revision of the manuscript for important intellectual content. Dr. Stevens: study concept and design, analysis or interpretation of data, drafting/revising the manuscript, critical revision of the manuscript for important intellectual content. Dr. Rae-Grant: analysis or interpretation of data, drafting/revising the manuscript, critical revision of the manuscript for important intellectual content.
Conflict of Interest
The American Academy of Neurology (AAN) is committed to producing independent, critical, and truthful clinical practice guidelines (CPGs). Significant efforts are made to minimize the potential for conflicts of interest to influence the recommendations of this CPG. To the extent possible, the AAN keeps separate those who have a financial stake in the success or failure of the products appraised in the CPGs and the developers of the guidelines. Conflict of interest forms were obtained from all authors and reviewed by an oversight committee prior to project initiation. The AAN limits the participation of authors with substantial conflicts of interest. The AAN forbids commercial participation in, or funding of, guideline projects. Drafts of the guideline have been reviewed by at least 3 AAN committees, a network of neurologists, Neurology peer reviewers, and representatives from related fields. The AAN Guideline Author Conflict of Interest Policy can be viewed at aan.com. For complete information on this process, access the 2004 AAN process manual.7
Disclosure
R. Petersen has served as a consultant for Roche Inc., Merck Inc., Genentech Inc., and Biogen Inc.; receives publishing royalties from Oxford University Press; performs clinical procedures relating to mild cognitive impairment in his clinical neurology practice; and receives research support from the National Institute on Aging of the NIH. O. Lopez has been a consultant for Grifols Inc., Lundbeck, and Raman Technologies and has received grant support from the NIH. M. Armstrong serves on the Level of Evidence editorial board for Neurology® (but is not compensated financially) and serves as an evidence-based medicine methodologist for the American Academy of Neurology (AAN). T. Getchius was an employee of the AAN and has nothing to disclose. M. Ganguli has served on the data safety and monitoring board for Indiana University and on the advisory committee for Biogen Inc. and has received research support from the National Institute on Aging of the NIH. D. Gloss serves as an evidence-based medicine methodologist for the AAN. G. Gronseth serves as associate editor for Neurology, serves on the editorial advisory board for Neurology Now, and is compensated by the AAN for methodologic activities. D. Marson serves as a consultant for and received royalties from Janssen Pharmaceuticals and receives research support from the National Institute on Aging for the NIH. T. Pringsheim has received financial reimbursement for travel to attend the Movement Disorder Society Meeting from Allergan Canada and Teva Canada Innovation and has received research support from Shire Canada Inc. and the Canadian Institutes of Health Research. G. Day received honoraria for serving as faculty at the 2016 AAN annual meeting and holds stock (>$10,000) in ANI Pharmaceuticals (generic manufacturer). M. Sager, J. Stevens, and A. Rae-Grant report no disclosures relevant to the manuscript. Go to Neurology.org/N for full disclosures.
Study Funding
This practice guideline was developed with financial support from the American Academy of Neurology. Authors who serve as AAN subcommittee members, methodologists, or employees, past or present (M.J.A., T.S.D.G., D.G., G.S.G., T.P., G.S.D, A.R.G.), were reimbursed by the AAN for expenses related to travel to subcommittee meetings where drafts of manuscripts were reviewed.
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The Academy must be commended for its update summary on mild cognitive impairment (MCI). [1] Petersen et al. utilized the robust methodology of evidence classification criteria and recommendations were graded and clear to the reader: "Clinicians may choose not to offer cholinesterase inhibitors (Level B); if offering, they must first discuss lack of evidence (Level A)."
Issues surrounding MCI have been overlooked by many European publications. The Lancet Commission claimed, "drinking only a moderate amount of alcohol increases life expectancy and health in ageing" [2] despite evidence that drinking is a risk factor for cognitive decline [3] and a carcinogen beginning at a one drink/day level. In 2017, the French High Council for Public Health retrieved an 11-year-old finding that claimed, "the prescription of current anti-Alzheimer drugs remains a small tool for the possible improvement of the quality of life of a few patients at a modest annual cost for the health insurance scheme." The Council incorporated these outdated findings into the concluding paragraph on medical treatment as if the material was current. [5] The report also ignored that anticholinergic medications rank top among inappropriate medications prescribed in French nursing homes. [5] For both publications, corrections are warranted as soon as possible.
The Academy guideline is unequivocal, useful, and usable. It will be used for patient benefit.
Conflict of interest: AB is a member of the High Council for Public Health at the French Department of Health.
1. Petersen RC, Lopez O, Armstrong MJ et al. Practice guideline update summary: Mild cognitive impairment: Report of the guideline development, dissemination, and implementation subcommittee of the American Academy of Neurology. Neurology 2018;90:126-135.
2. Livingston G, Sommerlad A, Orgeta V et al. Dementia prevention, intervention, and care. Lancet 2017;390:2673-2734.
3. Topiwala A, Allan CL, Valkanova V et al. Moderate alcohol consumption as risk factor for adverse brain outcomes and cognitive decline: longitudinal cohort study. BMJ 2017;357: j2353.
4. French High Council for Public Health. [Prevention of Alzheimer's disease and related diseases.] 31 Jan 2018. https://www.hcsp.fr/Explore.cgi/Telecharger?NomFichier=hcspr20171222_prv.... Accessed Feb 14, 2018.
5. Herr M, Grondin H, Sanchez S et al. Polypharmacy and potentially inappropriate medications: a cross-sectional analysis among 451 nursing homes in France. Eur J Clin Pharmacol 2017;73:601-608.
Disclosure: AB is a member of the High Council for Public Health at the French Department of Health.
For full disclosures, contact the editorial office at [email protected].
We thank Dr. Braillon for his thoughtful comments on our guideline. [1] We echo his concerns about the lack of awareness regarding MCI risk factors such as alcohol consumption and the lack of supporting evidence for use of pharmacologic agents for treating MCI, particularly anticholinergic medications. It is our hope that this guideline will play a key role in changing such misperceptions.
1. Petersen RC, Lopez O, Armstrong MJ et al. Practice guideline update summary: Mild cognitive impairment: Report of the guideline development, dissemination, and implementation subcommittee of the American Academy of Neurology. Neurology 2018;90:126-135.
We have some concerns about the recommendations on cholinesterase inhibitors in the recent guidelines on mild cognitive impairment (MCI). [1] Evidence in the guidelines, and in systematic reviews, [2-4] clearly show that cholinesterase inhibitors have no reliable benefit on cognition and do not reduce progression to dementia. At the same time, patients are exposed to risk: "side effects... are common, including gastrointestinal symptoms and cardiac concerns." [1] It is, therefore, curious that the message to practitioners is equivocal. They "may choose" not to use these medicines (recommendation B3a), or choose to actively prescribe them after, "first discuss[ing] with the patient the fact this is... not currently backed by empirical evidence" (recommendation B3b). [1] This is the first instance we recall of a learned academy legitimizing prescription of a class of drugs recognized to be ineffective. Given the guidelines' potential for influence, we are deeply concerned that patients--who often are ill-equipped to make judgments of this kind--may be unnecessarily exposed to harm, and health care systems to needless cost. More generally, we are anxious to avoid a precedent for evidence being viewed as "optional" in clinical decision-making. We call upon the AAN and authors to retract recommendation B3b and rewrite B3a to plainly recommend against use of cholinesterase inhibitors in MCI.
1. Petersen RC, Lopez O, Armstrong MJ, et al. Practice guideline update summary: Mild cognitive impairment: Report of the Guideline Development, Dissemination, and Implementation Subcommittee of the American Academy of Neurology. Neurology 2018;90:126-135.
2. Russ TC, Morling JR. Cholinesterase inhibitors for mild cognitive impairment. Cochrane Database Syst Rev 2012:CD009132.
3. Cooper C, Li R, Lyketsos C, Livingston G. Treatment for mild cognitive impairment: systematic review. Br J Psychiatry 2013;203:255-264.
4. Fink HA, Jutkowitz E, McCarten JR, et al. Pharmacologic Interventions to Prevent Cognitive Decline, Mild Cognitive Impairment, and Clinical Alzheimer-Type Dementia: A Systematic Review. Ann Intern Med 2018;168:39-51.
For disclosures, please contact the editorial office at [email protected].
The updated American Academy of Neurology guidelines on mild cognitive impairment (MCI) is essential both for clinical and research settings. [1] Dramatic changes in the definition of MCI over the past decades require a more dynamic and on-limits attitude towards newly-proposed diagnostic and treating methods, which lead to a few concerns that demand further explanation:
The guidelines mentioned a 14.4-55.6 percent reverting rate for patients with MCI to rehabilitate to normal cognitive status based on multiple Class-I studies. Could any subtle differences in clinical presentation be found during the course of disease among each subtype of MCI? For example, between MCI and MCI due to Alzheimer disease. If so, predicting prognosis could be made at an early stage. Further, we deem a more specific and detailed recommendation on nonpharmacologic treatments, which may include a variety of choices that were studied and validated throughout different research teams across the world (especially some unique and traditional types of exercise such as Tai Chi Chuan practice. [2-4] Meanwhile, since no cut-off points for diverse biomarkers, such as Amyloid beta and tau concentration in CSF, have been officially proposed, the documented value of these biomarkers in differential diagnosis remains uncertain. [5]
1. Petersen RC, Lopez O, Armstrong MJ, et al. Practice guideline update summary: Mild cognitive impairment: Report of the Guideline Development, Dissemination, and Implementation Subcommittee of the American Academy of Neurology. Neurology 2018;90:126-135.
2. Tao J, Chen X, Egorova N, et al. Tai Chi Chuan and Baduanjin practice modulates functional connectivity of the cognitive control network in older adults. Sci Rep 2017;7:41581.
3. Tao J, Liu J, Liu W, et al. Tai Chi Chuan and Baduanjin Increase Grey Matter Volume in Older Adults: A Brain Imaging Study. J Alzheimers Dis 2017;60:389-400.
4. Brasure M, Desai P, Davila H, et al. Physical Activity Interventions in Preventing Cognitive Decline and Alzheimer-Type Dementia: A Systematic Review. Ann Intern Med 2018;168:30-38.
5. Petersen RC, Caracciolo B, Brayne C, et al. Mild cognitive impairment: a concept in evolution. J Intern Med 2014;275:214-228.
For disclosures, please contact the editorial office at [email protected].
We thank Drs. Gang Wang and Hai-lun Cui for the comment on the recently published mild cognitive impairment (MCI) guideline. [1] We agree that there is a great deal of interest in predicting the patients with MCI who will revert to normal cognition, remain stable, or progress to dementia due to Alzheimer disease or other pathologies, whether using subtle differences in clinical presentation or emerging biomarkers. When participants are followed longitudinally, the reversion rates are substantially lower. [2,3] With regard to the suggested treatment studies, the 3 offered references were published after the time of the guideline's updated systematic review. [4-6] In reviewing these publications, we note that the publications did not focus on patients with MCI, an inclusion criterion for the therapeutic studies included in the guideline. We also agree with the uncertainty regarding the current role of biomarkers. This is reflected in recommendations A7a and A7b. [1] Recommendation A7a states that clinicians should counsel patients and families asking about biomarkers that there are no accepted biomarkers at this time. For interested patients, clinicians may discuss the option of biomarker research (recommendation A7b).
1. Petersen RC, Lopez O, Armstrong MJ, et al. Practice guideline update summary: Mild cognitive impairment: Report of the Guideline Development, Dissemination, and Implementation Subcommittee of the American Academy of Neurology. Neurology 2018;90:126-135.
2. Roberts RO, Knopman DS, Mielke MM, et al. Higher risk of progression to dementia in mild cognitive impairment cases who revert to normal. Neurology 2014;82:317–325.
3. Lopez OL, Becker JT, Chang YF, et al. Incidence of mild cognitive impairment in the Pittsburgh Cardiovascular Health Study-Cognition Study. Neurology 2012;79:1599–1606.
4. Tao J, Chen X, Egorova N, et al. Tai Chi Chuan and Baduanjin practice modulates functional connectivity of the cognitive control network in older adults. Sci Rep 2017;7:41581.
5. Tao J, Liu J, Liu W, et al. Tai Chi Chuan and Baduanjin Increase Grey Matter Volume in Older Adults: A Brain Imaging Study. J Alzheimers Dis 2017;60:389-400.
6. Brasure M, Desai P, Davila H, et al. Physical Activity Interventions in Preventing Cognitive Decline and Alzheimer-Type Dementia: A Systematic Review. Ann Intern Med 2018;168:30-38.
For disclosures, please contact the editorial office at [email protected].
The guideline panel thanks Valenzuela et al. for their thoughtful comments on the recommendations concerning the use of cholinesterase inhibitors for treating mild cognitive impairment (MCI). [1] The "may choose not" language resulted from the AAN guideline modified Delphi voting process. As stated in the rationale, the recommendation reflects the fact that some studies could not exclude an important effect of cholinesterase inhibitors on MCI outcomes. The recommendation is also consistent with the donepezil trial, which stated, "the observed relative reduction in the risk of progression to Alzheimer's disease of 58 percent at one year and 36 percent at two years in the entire cohort is likely to be clinically significant" and these data "could prompt a discussion between the clinician and the patient about this possibility." [2] Recommendation B3b reflects the reality that many patients with MCI are receiving cholinesterase inhibitors. [3] Guidelines do not tell clinicians what to do in a specific patient encounter. [4] Individual decisions should be based on shared decision making, which remains relevant in the context of MCI. In this situation, it is critical that clinicians help patients understand the evidence (Recommendation B3b) so that they can make an informed decision consistent with their priorities and preferences.
1. Petersen RC, Lopez O, Armstrong MJ, et al. Practice guideline update summary: Mild cognitive impairment: Report of the Guideline Development, Dissemination, and Implementation Subcommittee of the American Academy of Neurology. Neurology 2018; 90:126-135.
2. Petersen RC, Thomas RG, Grundman M, et al. Vitamin E and donepezil for the treatment of mild cognitive impairment. N Engl J Med 2005; 352:2379-2388, 2465-2468.
3. Schneider LS, Insel PS, Weiner MW. Alzheimer's Disease Neuroimaging Initiative. Arch Neurol 2011; 68:58-66.
4. Armstrong MJ, Gronseth GS. Approach to assessing and using clinical practice guidelines. Neurol Clin Pract 2018; 8:1-4.
For disclosures, please contact the Editorial office at [email protected].