Autonomic function parameters are predictors of increased limitations in Activities of Daily Living after a 2-year follow-up period in octogenarians: a prospective longitudinal study
Vrije Universiteit Brussel
2024
Background: Neurogenic orthostatic hypotension and blood pressure variability (BPV) may be considered as additional clinical parameters to evaluate pharmaceutical and non-pharmaceutical preventive interventions. This is particularly relevant if these parameters predict difficulties in performing Activities of Daily Living (ADL).
Aim: To explore the predictive value of autonomic function parameters for alternations in ADL mediated by changes in locomotor function in relatively robust octogenarians after a 2-year follow-up period.
Methods: This prospective longitudinal study included 267 participants (mean age: 82.98 ± 2.87 years) from the BUTTERFLY study. Data were collected at baseline and after 6, 12, and 24 months. The two-year follow-up period enabled the examination of both direct and indirect influences of autonomic function on the decline in ADL, mediated by changes in locomotor function, using PROCESS macro mediating logistic regression analysis.
Results: Systolic supine-to-stand BPV was associated with increased dependency in advanced ADL (unstandardized beta = 0.160, p<0.001) after a two-year follow-up in adults aged 80 and above. Visit-to-visit systolic BPV indirectly predicted more a-ADL limitations, mediated by changes in gait speed during year 1. No direct or indirect impact of autonomic function on b-ADL or i-ADL was observed after two years.
Conclusion: Our prospective study demonstrated that various autonomic function parameters predicted increased limitations in ADL among octogenarians after a two-year follow-up period. Consensus on threshold values for defining high BPV is essential for its clinical implementation, even in low cardiovascular risk cohorts.
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