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Intolerance to initial orthostasis relates to systolic BP changes in elders

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Abstract

Objectives

To explore the association of early symptoms of orthostatic intolerance (OI) with systolic (SBP), diastolic (DBP) and mean arterial (MAP) blood pressure changes in a sample of community-dwelling older people undergoing an active stand test; and to establish whether SBP and DBP changes have different symptomatic correlates during early orthostasis.

Methods

A total of 224 community-dwelling older subjects (mean age 72.6 years, 68.8% females) were included. All had a Mini-Mental State Examination score ≥23 and no risk factors for autonomic neuropathy. Subjects were monitored with the Finometer™ Pro device. Variables reflecting blood pressure changes (absolute low: nadir, magnitude of drop: delta, and speed of recovery) were extracted for SBP, DBP and MAP with the BeatScope™ software (5-s averages method), and correlated with self-reported OI during active stand.

Results

Of the 224 subjects, 62 (27.7%) reported OI. SBP changes had strong bivariate associations with OI, but not DBP changes. A logistic regression model suggested that the rate of recovery of SBP during the first 30 s following active stand is more important as a determinant of OI than SBP nadir or delta. Subjects who recovered at least 80% of their baseline SBP within 30 s post-stand were very unlikely to report OI.

Interpretation

Our study suggests that orthostatic SBP changes may be more important than DBP changes as determinants of early OI during active stand. The crucial importance of the quick recovery of SBP in order to avoid OI is biologically plausible and is discussed in the context of initial OH pathophysiology.

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Acknowledgments

The Technology Research for Independent Living (TRIL) Centre focuses on the research of new technologies to enable people to live independent lives for as long as possible in the environment of their choosing. The Centre is a joint initiative between Intel and the Industrial Development Agency (IDA) Ireland. The Centre is an active research collaboration between industry and academic partners including Intel, Trinity College Dublin, University College Dublin, and the National University of Ireland Galway and represents a multidisciplinary team of up to 70 researchers including Ethnographers Designers, Clinicians, Economists and a range of Scientists and Technologists. The authors would also like to acknowledge Dr Kathleen Bennett, medical statistician at the Department of Pharmacology and Therapeutics (Trinity College Dublin), for her statistical advice. The TRIL Clinic is funded by Intel Corporation and the Industrial Development Agency (IDA) Ireland, with operational support from St James’s Hospital Dublin. The financial sponsors played no role in the design, execution, analysis and interpretation of data, or writing of the study.

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Correspondence to Roman Romero-Ortuno.

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Romero-Ortuno, R., Cogan, L., Fan, C.W. et al. Intolerance to initial orthostasis relates to systolic BP changes in elders. Clin Auton Res 20, 39–45 (2010). https://doi.org/10.1007/s10286-009-0040-3

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  • DOI: https://doi.org/10.1007/s10286-009-0040-3

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