Co-morbidity associated with dementia.
OBJECTIVE
The purpose of this study was to identify common co-morbid conditions associated with dementia subtypes and to evaluate the association of hypertension, diabetes mellitus, atrial fibrillation, congestive heart failure, and anemia with dementia subtypes relative to controls.


METHODS
Hospital discharge data were used to identify 15,013 subjects from South Carolina with a diagnosis of dementia between 1998 and 1999. A control group of 15,013 persons without dementia was randomly sampled from hospital discharge records and matched to persons with dementia on the basis of age, race, and gender. Multiple hospitalizations for each patient were merged, and repeated diagnoses during separate hospitalizations were counted once.


RESULTS
After adjusting for age, race, and gender, persons with Alzheimer's disease and dementia associated with medical conditions were less likely to be diagnosed with hypertension, diabetes, congestive heart failure, and atrial fibrillation than were controls. Patients with multi-infarct dementia were also less likely to have congestive heart failure, but were more likely to have diabetes. Anemia was not associated with any dementia subtype.


CONCLUSIONS
There are distinct differences in comorbid conditions among dementia subtypes. Our research does not support previous studies that suggest a circulatory component to the development of Alzheimer's disease.
Sanderson
Maureen
M
Alzheimer's Disease Registry, Norman J. Arnold School of Public Health, University of South Carolina, Columbia, USA.
Wang
Jing
J
Davis
Dorothy R
DR
Lane
Marcia J
MJ
Cornman
Carol B
CB
Fadden
Mary K
MK
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000544:Alzheimer Disease / Q000453:epidemiology* / Q000209:etiology; D000740:Anemia / Q000150:complications / Q000453:epidemiology*; D002318:Cardiovascular Diseases / Q000150:complications / Q000453:epidemiology*; D015897:Comorbidity; D003704:Dementia / Q000453:epidemiology* / Q000209:etiology; D015161:Dementia, Multi-Infarct / Q000453:epidemiology* / Q000209:etiology; D048909:Diabetes Complications; D003920:Diabetes Mellitus / Q000453:epidemiology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012307:Risk Factors; D013022:South Carolina / Q000453:epidemiology