Alcohol consumption and transition of mild cognitive impairment to dementia

Authors


*Gelin Xu, MD, PhD, Department of Neurology, Jinling Hospital, Nanjing University School of Medicine, 305 East Zhongshan Road, Nanjing 210002, Jiangsu Province, China. Email: gelinxu@gmail.com

Abstract

Aim:  Mild cognitive impairment (MCI) is a prodrome for dementia. Alcohol drinking patterns may affect cognitive functions and the effects may accumulate to a significant level at an advanced age. This study investigated the relationship between alcohol consumption and risks for dementia in a cohort of elderly patients with MCI.

Methods:  Patients with suspected cognitive impairment were screened. One hundred and seventy-six patients who met the MCI criteria were enrolled. Lifetime and daily alcohol consumptions were assessed at baseline using a self-report questionnaire answered by patients and their caregivers. Patients were classified according to alcohol consumptions as abstainers, light–moderate and heavy drinkers. Global cognitive functions were assessed periodically with Mini-Mental State Examination (MMSE). Enrolled patients were followed for 2 years.

Results:  Of the 176 patients diagnosed as having MCI, 15 (8.5%) died, 13 (7.4%) were lost to follow up, and 66 (37.5%) developed dementia during follow up. Light–moderate alcohol drinkers had better MMSE performance than abstainers (P < 0.05) and heavy drinkers (P < 0.01) 2 years after MCI diagnosis. Patients who consumed a total of ≤300 kg alcohol prior to MCI diagnosis had less cognitive decline than patients who consumed no (P < 0.05) or >300 kg alcohol (P < 0.01). Heavy drinkers had a higher risk for dementia than abstainers (P < 0.05) and light–moderate drinkers (P < 0.05) 2 years after MCI diagnosis.

Conclusions:  A J-shaped relationship may exist between alcohol consumption and cognitive decline in MCI patients. Light–moderate alcohol drinking may be associated with decreased risks for dementia in elderly patients with MCI.

Ancillary