March 2000

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IN THIS ISSUE

RISK FACTORS AND NATURAL
HISTORY OF AD

  • Type 2 diabetes mellitus may contribute to Alzheimer's disease
  • Being single increases the risk of Alzheimer's disease
  • Mild head trauma is not associated with AD risk
  • Depression is found to precede Alzheimer's disease

HYPERTENSION AND VASCULAR DEMENTIA

  • Cognitive decline is quickened in patients with high blood pressure
  • It is necessary to define sub groups of vascular dementia

BEHAVIOURAL AND PSYCHOLOGICAL SYMPTOMS IN DEMENTIA: NATURAL HISTORY AND TREATMENT

  • Patients with severe dementia are prone to aggressive behaviour
  • Resistiveness to care is correlated more with executive dysfunction than cognitive dysfunction
  • Estrogen therapy may decrease aggression
  • Poor visual acuity is associated with visual hallucinations

EDITORIAL
FOREWORD
RISK FACTORS AND NATURAL HISTORY
OF ALZHEIMER'S DISEASE

A number of reports were recently published concerning the increased risk of dementia associated with diabetes mellitus (Ott et al) and being single (Helmer et al). Head trauma was not found to be significant (Mehta et al). The long held impression that depressive symptoms can be a prodrome of Alzheimer's was confirmed (Berger et al).

Diabetes mellitus and the risk of dementia:
the Rotterdam Study

(NEUROLOGY 1999;53:1937-1942)
A. OTT, MD, PHD,
R.P. STOLK, MD, PHD,
F. VAN HARSKAMP, MD,
H.A.P. POLS, MD, PHD,
ET AL,
UTRECHT, THE NETHERLANDS

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Marital status and risk of Alzheimer's disease:
a French population-based cohort study

(NEUROLOGY 1999;53:1953-1958)
C.HELMER, MD,
D. DAMON, MD,
L. LETENNEUR, PHD,
C. FABRIGOULE, PHD,
ET AL,
PARIS, FRANCE,
ANN ARBOR, MI

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Head trauma and risk of dementia and
Alzheimer's disease: the Rotterdam Study

(NEUROLOGY 1999;53:1959-1962)
K.M. MEHTA, DSC,
A. OTT, MD, PHD,
S. KALMIJN, MD, PHD,
A.J.C. SLOOTER, MD, PHD,
ET AL,
ROTTERDAM, THE NETHERLANDS

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The occurrence of depressive symptoms in the
preclinical phase of ad: a population-based study

(NEUROLOGY 1999;53:1998-2002)
A-K. BERGER, MSC,
L. FRATIGLIONI, MD, PHD,
Y. FORSELL, MD, PHD,
ET AL,
STOCKHOLM AND UPPSALA, SWEDEN

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HYPERTENSION AND VASCULAR DEMENTIA

EDITORIAL
COMMENT
Tzourio et al confirmed the association between high blood pressure and cognitive decline, whereas a full supplement of Alzheimer Disease and Associated Disorders summarize the results of the First Osaka Conference on Vascular Dementia; a representative abstract is that of Rockwood et al on subtypes of Vascular Dementia.

Cognitive decline in individuals with high blood
pressure: a longitudinal study in the elderly

(NEUROLOGY 1999;53:1948-1952)
CHRISTOPHE TXOURIO, MD, PHD,
CAROLE DUFOUIL, PHD,
PIERRE DUCIMETIÈRE, PHD,
ANNICK ALPÉROVITCH, MSC,
FOR THE EVA STUDY GROUP,
PARIS, FRANCE

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Subtypes of vascular dementia

(ALZHEIMER DIS 1999;3[13]:59-65)
KENNETH ROCKWOOD,
JOHN BOWLER,
TIMO ERKINJUNTTI,
VLADIMIR HACHINSKI,
ET AL,
HALIFAX, NS,
LONDON, UK,
HELSINKI, FINLAND,
LONDON, ON

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BEHAVIOURAL AND PSYCHOLOGICAL SYMPTOMS IN DEMENTIA: NATURAL HISTORY AND TREATMENT

EDITORIAL
COMMENT
Behavioural and psychological symptoms in dementia (BPSD) are common serious problems that affect quality of life for both patient and caregiver. Some of the most troublesome behaviours are aggression and resistiveness to care, which often result in the need to institutionalize the patient with dementia. In a 10-year longitudinal study of patients with dementia originally living at home, Keene et al noted that 96% of patients presented with severe or persistent aggressive behaviours at some point in their course. Verbal and physical aggression, and aggressive resistiveness to care frequently lasted for years and would persist until the death of the patient. Stewart et al suggest the Executive Interview (EXIT), a brief assessment scale for executive dysfunction, was much more strongly correlated with resistiveness to care than overall cognitive dysfunction as measured by the MMSE. Assessment of frontal/subcortical function in patients with dementia may help to predict aggressive, resistive behaviours.

First line pharmacotherapy for BPSD should be treatment with an atypical antipsychotic (e.g. risperidone) based upon recent well designed RCTs. Unfortunately, these agents are only modestly effective for many patients, and a large variety of other drugs have been used including antidepressants, anticonvulsants, and benzodiazepines. In the first RCT of conjugated estrogens for the treatment of aggressive behaviours in dementia, Kyomen et al suggest that doses as low as 0.625 mg per day can significantly decrease total aggression and the frequency of aggressive incidents within the first week of therapy.

In a fascinating study comparing Alzhemier's disease patients with and without visual hallucinations (Chapman et al), visual acuity was significantly more impaired in patients with hallucinations, and none of the patients with visual hallucinations had normal acuity. When vision was improved by refraction in a portion of the patients with hallucinations, most of these patients were free of hallucinations on follow-up.

Natural history of aggressive behaviour in dementia

(INT J GERIAT PSYCHIATRY 1999;14:541-548)
JANET KEENE,
TONY HOPE,
CHRISTOPHER G. FAIRBURN,
ROBIN JACOBY,
ET AL,
OXFORD, UK

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Cognitive predictors of resistiveness in dementia patients

(AM J GERIATR PSYCHIATRY 1999;7:259-263)
JONATHAN T. STEWART, MD,
EDUARDO GONZALEZ-PEREZ, MD,
YILIANG ZHU, PHD,
BRUCE E. ROBINSON, MD, MPH,
BAY PINES, FL

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Estrogen therapy and aggressive behavior in elderly
patients with moderate-to-severe dementia: results
from a short-term, randomized, double-blind trial

(AM J GERIATR PSYCHIATRY 1999;7:339-348)
HELEN H. KYOMEN, MD, MSC,
ANDREW SATLIN, MD,
JOHN HENNEN, PHD,
JEANNE Y. WEI, MD, PHD,
BOSTON, BELMONT,
FRAMINGHAM, NATICK, MA

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Association among visual hallucinations, visual
acuity, and specific eye pathologies in
Alzheimer's disease: treatment implications

(AM J PSYCHIATRY 1999;156:1983-1985)
FIONA M. CHAPMAN, FRC, OPHTH,
JANE DICKINSON, MRCP, FRC, OPHTH,
IAN MCKEITH, MRC, PSYCH, MD,
CLIVE BALLARD, MRC PSYCH, MD,
NEWCASTLE, UK

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THE FOLLOWING WEBSITES WERE JUDGED BY
THE EDITORS TO BE OF INTEREST.

Alzheimer Society of Canada http://www.alzheimer.ca

Alzheimer's Association http://www.alz.org

Alzheimer's Disease Education & Referral (ADEAR) Center http://www.alzheimers.org