Family Practice Advance Access originally published online on July 7, 2009
Family Practice 2009 26(5):339-343; doi:10.1093/fampra/cmp047
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High medical co-morbidity and family history of dementia is associated with lower cognitive function in older patients
a Department of Psychiatry
b Department of Neurology
c Department of Geriatric Medicine, University of Pittsburgh, Pittsburgh, PA, USA
Correspondence to Lisa A Morrow, Western Psychiatric Institute and Clinic, 3811 O'Hara Street, Pittsburgh, PA 15213, USA; E-mail: morrowla{at}upmc.edu
Received 11 December 2008; Revised 3 June 2009; Accepted 13 June 2009.
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Abstract |
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Background. Risk factors for cognitive decline in ageing are multifactorial, including medical co-morbidities and familial genetic risk.
Objectives. To assess the effect of medical co-morbidity and family history of dementia on cognitive performance in older outpatients of family practitioners.
Methods. Analysis of 535 outpatients from 11 practices aged 65 and older, without a diagnosis of dementia. Information on medical co-morbidities, family history of dementia and cognitive test data were obtained.
Results. Patients were classified into high or low medical co-morbidities (<7 versus >8) and positive or negative family history of dementia. After controlling for age, education, gender and depression, global cognitive test scores, as well as memory, executive function, spatial ability and attention were significantly lower for persons having a high number of medical co-morbidities. Cognitive test scores were not significantly different for persons with or without a family history of dementia. A significant interaction between medical co-morbidities and family history of dementia was observed for the global cognitive score, executive function and spatial ability. Those persons with a high number of medical co-morbidities and positive family history of dementia had the lowest performance. Separate regression analysis assessing individual disease risk factors (e.g. hypertension and diabetes) did not find any relationship between specific medical variables and cognitive test scores for any of the subgroups.
Conclusions. A high number of medical co-morbidities in addition to a reported family history of dementia are particularly detrimental to cognitive performance in elderly non-demented family practice patients.
Keywords. Cognitive, family history of dementia, medical co-morbidity, primary care.
Morrow LA, Snitz BE, Rodriquez EG, Huber KA and Saxton JA. High medical co-morbidity and family history of dementia is associated with lower cognitive function in older patients. Family Practice 2009; 26: 339–343.