The impact of cognitive impairment in dementia on self-care domains in diabetes mellitus: a systematic search and narrative review.

Abstract

Self‐management is integral to effective chronic disease management. Cognitive impairments (CogImp) associated with dementia have not previously been reviewed in diabetes mellitus (DM) self‐care. The aims of this study are to know (1) whether CogImp associated with dementia impact self‐care and (2) whether specific CogImp affects key DM self‐care processes. A systematic literature search with a narrative review was conducted according to Preferred Reporting Items for Systematic Reviews and Meta‐Analyses guidelines. This review examined studies published from January, 2000 to February, 2016 describing the relationship between cognition and DM self‐care domains in community dwelling older adults with dementia/CogImp. Eight studies met inclusion criteria. Decrements in all self‐care domains were associated with CogImp. Problem solving was related to reduced disease knowledge (OR 0.87, 95% CI = 0.49‐1.55), resulting in poorer glycemic control. Decision‐making impairments manifested as difficulties in adjusting insulin doses, leading to more hospital admissions. People without CogImp were better able to find/utilize resources by adhering to recommended management (OR 1.03, 95% CI = 1.02‐1.05). A lack of interaction with health care providers was demonstrated through reduced receipt of important routine investigation including eye examinations (ARR = 0.85, 95% CI = 0.85‐0.86), HbA1c testing (ARR = 0.96, 95% CI = 0.96‐0.97), and LDL‐C testing (ARR = 0.91, 95% CI = 0.901‐0.914). People without CogImp had better clinic attendance (OR 2.17, 95% CI = 1.30‐3.70). Action taking deficits were apparent through less self‐testing of blood sugar levels (20.2% vs 24.4%, P = 0.1) resulting in poorer glycemic control, self‐care, and more frequent micro/macrovascular complications. Persons with diabetes and CogImp, particularly in domains of learning, memory and executive function, were significantly impaired in all self‐care tasks.