Breno S Diniz1, Maria Fernanda Lima-Costa2, Sérgio Viana Peixoto3, Joselia O A Firmo2, Karen C L Torres4, Olindo Assis Martins-Filho5, Andréa Teixeira-Carvalho5, James Grady6, George A Kuchel7, Erico Castro-Costa2. 1. UConn Center on Aging (BSD, GAK), University of Connecticut Health Center, Farmington, CT; Department of Psychiatry, School of Medicine (BSD), University of Connecticut Health Center, Farmington, CT. Electronic address: diniz@uchc.edu. 2. Center for Studies in Public Health and Aging (NESPE) (MFLC, SVP, JOAF, ECC), Rene Rachou Research Center, Oswaldo Cruz Foundation, Belo Horizonte, Minas Gerais, Brazil. 3. Center for Studies in Public Health and Aging (NESPE) (MFLC, SVP, JOAF, ECC), Rene Rachou Research Center, Oswaldo Cruz Foundation, Belo Horizonte, Minas Gerais, Brazil; Nursing School (SVP), Federal University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil. 4. Integrated Research Group on Biomarkers, Rene Rachou Research Center (KCLT, OAMF, ATC), Oswaldo Cruz Foundation, Belo Horizonte, Minas Gerais, Brazil; Faculty of Medicine (KCLT), University José do Rosário Vellano, UNIFENAS, Belo Horizonte, Minas Gerais, Brazil. 5. Integrated Research Group on Biomarkers, Rene Rachou Research Center (KCLT, OAMF, ATC), Oswaldo Cruz Foundation, Belo Horizonte, Minas Gerais, Brazil. 6. Department of Public Health Sciences, School of Medicine (JG), University of Connecticut Health Center, Farmington, CT. 7. UConn Center on Aging (BSD, GAK), University of Connecticut Health Center, Farmington, CT.
Abstract
BACKGROUND: Cognitive impairment and physical frailty are common among older adults and associated with a higher likelihood of adverse health outcomes. These two conditions frequently coexist in the same individual as cognitive frailty, yet few studies have examined the impact of such comorbidity on clinical outcomes or underlying biological mechanisms. METHODS: A total of 1,340 older adults (age ≥60 years old) from the Bambui Cohort Study of Ageing, with a total follow-up of 10 years, were included in this study. Frailty was defined by the accumulation of deficit framework and cognitive impairment based on scores on the MMSE less than 22. In addition, serum IL-6 levels were measured by cytometric bead array assay. RESULTS: Individuals classified with cognitive frailty had significantly higher serum IL-6 levels compared to the robust, cognitively unimpaired group. Those with cognitive frailty (aOR = 1.97 [1.18-3.27] and prefrailty and cognitive impairment (aOR = 1.83 [1.24-2.69]) had the highest mortality risk over 10 years of follow-up. Higher IL-6 levels were also independently associated with a higher mortality rate (aOR = 1.37 [1.23-1.54]). CONCLUSION: Our study shows that cognitive Frailty indicates a vulnerability state and of increasing mortality risk. Our findings also suggested that proinflammatory abnormalities can be viewed as a central phenomenon underlying common age-related problems (e.g., cognitive impairment and Frailty) and outcomes (e.g., mortality).
BACKGROUND: Cognitive impairment and physical frailty are common among older adults and associated with a higher likelihood of adverse health outcomes. These two conditions frequently coexist in the same individual as cognitive frailty, yet few studies have examined the impact of such comorbidity on clinical outcomes or underlying biological mechanisms. METHODS: A total of 1,340 older adults (age ≥60 years old) from the Bambui Cohort Study of Ageing, with a total follow-up of 10 years, were included in this study. Frailty was defined by the accumulation of deficit framework and cognitive impairment based on scores on the MMSE less than 22. In addition, serum IL-6 levels were measured by cytometric bead array assay. RESULTS: Individuals classified with cognitive frailty had significantly higher serum IL-6 levels compared to the robust, cognitively unimpaired group. Those with cognitive frailty (aOR = 1.97 [1.18-3.27] and prefrailty and cognitive impairment (aOR = 1.83 [1.24-2.69]) had the highest mortality risk over 10 years of follow-up. Higher IL-6 levels were also independently associated with a higher mortality rate (aOR = 1.37 [1.23-1.54]). CONCLUSION: Our study shows that cognitive Frailty indicates a vulnerability state and of increasing mortality risk. Our findings also suggested that proinflammatory abnormalities can be viewed as a central phenomenon underlying common age-related problems (e.g., cognitive impairment and Frailty) and outcomes (e.g., mortality).
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