Reduction in brain tissue oxygenation placing older adults with multiple health conditions at risk of faints and falls

old person at window
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Researchers from Mercer's Institute for Successful Aging (MISA) and the Department of Medical Physics at St James's Hospital and Trinity College Dublin have discovered that brain tissue oxygenation is lower in frailer older adults with multiple health conditions (multi-morbidity), putting them at risk of faints and falls. Brain oxygenation—the measure of oxygen in brain tissue—reflects the balance between oxygen delivery and consumption and is vital for the maintenance of normal brain function and tissue integrity. The research and its importance were recently recognized by a cover article in the Journal of the American Geriatric Society.

The study demonstrated in a group of 350 older adults that those with multiple chronic health conditions, especially women, are more prone to having both large blood pressure drops and lower brain oxygenation after standing up, increasing their risk of dizziness, faints and falls.

Key findings

  • Multi-morbidity is associated with after standing up. Monitors that measure blood pressure during every heartbeat play a key role in clinically assessing falls and faints.
  • Multi-morbidity is also linked to large drops in brain oxygenation following standing up. Simple sensors that measure brain oxygenation could improve how dizziness, falls and faints are diagnosed and managed in the future, especially those who have multiple health conditions.

The study was carried out as part of a wider program of research examining new ways of detecting those at risk of faints using novel brain sensors and artificial intelligence tools. Brain oxygenation and blood pressure measurement may help us understand and manage multi-morbidity and how it leads to poor health outcomes such as faints and falls in older people.

This research was undertaken by Ph.D. researcher Laura Perez-Denia, from the Department of Medical Gerontology, Trinity College Dublin, MISA and the Department of Medical Physics at St James's Hospital.

The work was led by study co-Principal Investigators Dr. Ciarán Finucane, Clinical Senior Lecturer and Physicist at MISA, and Professor Rose Anne Kenny, Director of the Falls and Syncope Unit at MISA.

Perez-Denia says that "falls and faints affect 1 in 3 each year affecting their quality of life and increasing their risk of serious injury. Our work has discovered that new signs of accelerated brain aging can occur in those with common chronic placing these individuals at a higher risk of falling and consequently ill health. We have shown that these signs can be detected using novel brain sensor technologies which are both inexpensive and practical for opening up potential new avenues for clinical management."

Kenny says that "these findings shed new light on some of the most common and potentially devastating conditions in older patients, with critical implications for diagnosing and managing falls and faints, both of which are the commonest causes of hip fractures and head injuries. Detection of intermittent low blood pressure and low brain provide a novel approach to prevent serious disabilities and thereby maintain well-being and good health for longer."

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More information: Laura Pérez‐Denia et al, Increased multimorbidity is associated with impaired cerebral and peripheral hemodynamic stabilization during active standing, Journal of the American Geriatrics Society (2022). DOI: 10.1111/jgs.17810
Citation: Reduction in brain tissue oxygenation placing older adults with multiple health conditions at risk of faints and falls (2022, August 18) retrieved 30 September 2022 from
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