Clinical Autonomic Research

, Volume 25, Issue 6, pp 373–381 | Cite as

Phenotypes of orthostatic blood pressure behaviour and association with visual acuity

  • Bláithín Ní Bhuachalla
  • Christine A. McGarrigle
  • Kwadwo Owusu Akuffo
  • Tunde Peto
  • Stephen Beatty
  • Rose Anne Kenny
Research Article

Abstract

Background

Manifestations of neurocardiovascular instability (NCVI), including orthostatic hypotension (OH) orthostatic hypertension (OHTN) and impaired blood pressure variability (BPV), have been associated with cardiovascular (CV) events. The eye is highly vascular and we propose an ideal target end organ to investigate pathological implications of NCVI.

Objective

To identify and define clinically applicable phenotypes of orthostatic blood pressure (BP) behaviour, analogous to OH, OHTN, and orthostatic BPV and to investigate their relationship to vision.

Methods

Wave one data from the Irish Longitudinal Study on Ageing (TILDA) were used. Orthostatic BP (OBP) phenotypes were identified and defined from beat-to-beat BP data, measured by digital photoplethysmography during an active stand (AS) lasting 110 s (s). Visual acuity (VA) was assessed using the Early Treatment Diabetic Retinopathy Study (EDTRS) LogMAR chart. The relationship between OBP phenotypes and VA in 4355 adults aged ≥50 years was investigated through multivariate linear regression models.

Results

There was a wide fluctuation in the prevalence of OH and OHTN up to 20 s after standing. After 30 s, four distinct OBP phenotypes were identified: in 70 % BP stabilised to within 20/10 mmHg of baseline BP, 4 % had persistent OH, 2 % had persistent OHTN and 25 % had exaggerated orthostatic blood pressure variability BPV. Systolic BPV was associated with worse VA (P = 0.02) as was diastolic BPV (P = 0.03), following adjustment for demographics, health behaviours, self-report eye diseases and diabetes, uncorrected refractive error, objective hypertension and antihypertensives.

Conclusions

The hypothesis that NCVI may independently modulate CV risk is supported the independent association of exaggerated BPV and worse VA.

Keywords

Eye Visual acuity Orthostatic hypotension Orthostatic hypertension Blood pressure variability End-organ damage 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Bláithín Ní Bhuachalla
    • 1
  • Christine A. McGarrigle
    • 2
  • Kwadwo Owusu Akuffo
    • 3
  • Tunde Peto
    • 4
  • Stephen Beatty
    • 3
  • Rose Anne Kenny
    • 1
    • 2
  1. 1.Department of Medical Gerontology, School of Medicine, Trinity College DublinTrinity Centre for Health Sciences, St James’s HospitalDublin 8Ireland
  2. 2.The Irish Longitudinal Study on Ageing (TILDA), Trinity College DublinCollege GreenDublin 2Ireland
  3. 3.Macular Pigment Research Group, Vision Research Centre Carriganore HouseWaterford Institute of TechnologyWaterfordIreland
  4. 4.Department of Research and DevelopmentNational Institute of Health Research Biomedical Research Centre at Moorfields Eye Hospital National Health Service Foundation Trust and UCL Institute of OphthalmologyLondonUK

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