At its Meeting 139, the DDC Editorial Policy Committee approved new and changed provisions for dementia in the medicine schedule. Previously, comprehensive medical works on dementia were classed along with various other diseases in 616.83 Other organic diseases of central nervous system. At 616.83 there is no add note to "add as instructed under 616.1-616.9," and thus no possibility to add the specialized subdivisions found in the add table under 616.1-616.9 Specific diseases, e.g.:
616.1-616.9:06 Therapy
616.1-616.9:042 Genetic diseases (Hereditary diseases)
Class here genetic aspects of diseases with complex causation, medical genetics
616.1-616.9:075-079 Diagnosis, prognosis, death, immunity
Now comprehensive medical works on dementia have been moved down to 616.831 Dementia, which has an add note to "add as instructed under 616.1-616.9." Here is the Hierarchy box showing the context of the number:
Here is the Notes box, showing the notes associated with 616.831 (including note, class-here note, class-elsewhere note, scatter see reference, and add note in the form of a footnote marked with an asterisk [*]):
Examples:
Dementia: Non-pharmacological therapies
LCSH:
Dementia--Treatment
Dementia--Psychological aspects
DDC before changes: 616.83
DDC after changes: 616.83106
Diagnostic test accuracy studies in dementia: A pragmatic approach
LCSH: Dementia--Diagnosis
DDC before changes: 616.83
DDC after changes: 616.831075
Alzheimer disease, which was previously classed in 616.831, has been moved down to a new subdivision, which has its own add note to "add as instructed under 616.1-616.9":
616.8311 Alzheimer disease. (Note: DDC uses "Alzheimer disease" in the schedule instead of "Alzheimer's disease" because in the medicine schedule DDC tries to follow Medical Subject Headings (MeSH®) when possible, except for capitalization; in MeSH the preferred term is "Alzheimer Disease." Both forms can be found in the WebDewey Relative Index.)
Example:
Decoding darkness: The search for the genetic causes of Alzheimer's disease
LCSH:
Alzheimer's disease
Alzheimer's disease--Genetic aspects
Amyloid beta-protein
DDC before changes: 616.831042
DDC after changes: 616.8311042
We have also provided new numbers (with add notes to add as instructed under 616.1-616.9) for two other specific kinds of dementia.
616.812 Vascular dementia
Example:
Vascular dementia: Cerebrovascular mechanisms and clinical management
LCSH: Vascular dementia
DDC before changes: 616.81
DDC after changes: 616.812
616.8336 Lewy body dementia
Example:
A caregiver's guide to Lewy body dementia
LCSH: Lewy body dementia--Popular works
DDC before changes: 616.83
DDC after changes: 616.8336