Question

The clinical description of MAJOR AND MILD NEUROCOGNITIVE
DISORDER in conjunction with MAJOR NEUROCOGNITIVE DISORDER
DUE TO ALZHEIMER’S DISEASE [You will realise that there are
overlaps – both will assist you to answer the relevant questions].
 The classes of NEUROCOGNITIVE DISORDER based on (presumptive)
aetiology [Just to name – no detail required].

Answer 1

Neurocognitive disorders are categorized into major and mild forms, with specific subtypes based on their etiology. Here’s a brief overview of these classifications:

### Major Neurocognitive Disorder
- Significant cognitive decline from a previous level of performance in one or more cognitive domains (e.g., complex attention, executive function, learning and memory, language, perceptual-motor, or social cognition), which interferes with independence in everyday activities.

### Mild Neurocognitive Disorder
- Modest cognitive decline from a previous level of performance in one or more cognitive domains, which does not interfere with independence in everyday activities but may require accommodations or assistance.

### Classes of Neurocognitive Disorder based on (presumptive) aetiology:
1. **Alzheimer's Disease**
2. **Frontotemporal Lobar Degeneration**
3. **Vascular Disease**
4. **Traumatic Brain Injury**
5. **Substance/Medication-Induced Neurocognitive Disorder**
6. **HIV Infection**
7. **Prion Disease**
8. **Parkinson’s Disease**
9. **Huntington's Disease**
10. **Another Medical Condition**

Each of these classes reflects different underlying mechanisms and risk factors contributing to cognitive decline.