Affective disturbances in Alzheimer's disease

Area of Science:

• Neurology
• Psychiatry
• Gerontology

Background:

• Alzheimer's disease (AD) is a progressive neurodegenerative disorder.
• Emotional disturbances are common in AD but often not diagnosed using standard criteria.
• Understanding these disturbances is crucial for patient care.

Purpose of the Study:

• To evaluate emotional disturbances in Alzheimer's disease patients.
• To compare categorical and dimensional approaches for assessing these disturbances.
• To investigate the relationship between emotional symptoms, cognitive status, and anxiety in AD.

Main Methods:

• Prospective study involving 118 AD outpatients, 34 healthy controls, and 20 depressed inpatients.
• Semi-structured interviews using scales for depression (Hamilton Depression Rating Scale, Retardation Rating Scale), anxiety (Tyrer and Covi scales), and emotional disturbances (Depressive Mood Scale).
• Cognitive status assessed using Mini-Mental State Examination and Mattis Dementia Rating Scale.

Main Results:

• No AD patients met criteria for Major Depressive Episode or Generalized Anxiety Disorder; 8% met criteria for Dysthymic Disorder.
• AD patients showed higher depressive and anxious symptomatology than controls, but lower than the depressed group.
• Two dimensions of emotional disturbance emerged: Emotional Deficit (linked to cognitive decline) and Loss of Control (linked to symptom severity).

Conclusions:

• Affective changes are frequent in Alzheimer's disease, but major affective disorders are rare.
• A dimensional approach, focusing on symptom dimensions like Emotional Deficit and Loss of Control, is more suitable for describing emotional disturbances in AD than a categorical approach.
• Emotional disturbances in AD correlate with cognitive status and symptom severity.