Falls in Older People: Risk Factors and Strategies for Prevention / Edition 2

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Overview

Since the first edition of this very successful book was written to synthesise and review the enormous body of work covering falls in older people, there has been an even greater wealth of informative and promising studies designed to increase our understanding of risk factors and prevention strategies. This new edition is written in three parts: epidemiology, strategies for prevention, and future research directions. New material includes the most recent studies covering: balance studies using tripping, slipping and stepping paradigms; sensitivity and depth perception visual risk factors; neurophysiological research on automatic or reflex balance activities; and the roles of syncope, vitamin D, cataract surgery, health and safety education, and exercise programs. This new edition will be an invaluable update for clinicians, physiotherapists, occupational therapists, nurses, researchers, and all those working in community, hospital and residential or rehabilitation aged care settings.

The book contains black-and-white illustrations.

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Editorial Reviews

Doody's Review Service
Reviewer: Jean A Krampe, MSN, RN (Alexian Brothers Community Services-PACE)
Description: This is a comprehensive discussion of published articles on the emerging problem of older persons falling. Building on the first edition published in 2001, the second edition uses an analytical approach, systematically addressing the multifactorial issues associated with falls in multiple settings.
Purpose: The authors' purpose is to provide healthcare workers a resource with evidence-based research depicting the risk factors and strategies for prevention of falls. They aim to evaluate the evidence for each factor implicated with falls and they use an analytical approach to challenge traditional fall reduction programs and complete their mission by suggesting future areas for research. This unique approach is both effective and valuable for anyone addressing falls in older persons. Reviewing the prolific body of literature striving to address the problem of falls is a daunting task. The book assists readers in identifying the best approaches to consider in addressing this complex problem.
Audience: The authors intend their book as a resource for healthcare workers to gain access to current thinking and best clinical practices in fall risk factors and prevention. The complete interdisciplinary team of healthcare workers is targeted, from nurses to physical therapists, occupational therapists, social workers and physicians. I see the scope of this book also appealing to educators, students, researchers, and anyone interested in gerontology.
Features: The analytical approach challenging traditional fall prevention programs is particularly beneficial to practitioners, educators, and researchers. The section addressing exercise that categorizes the interventions into community dwellers versus traditional is helpful. I would like to see this approach used more in the next edition. The critical epidemiological section includes key information. The sections on balance and gait provide a valuable primer for practitioners outside of physical therapy along with researchers interested in this topic. Overall, the book flows well with good graphs and visuals. The tables of research showing approaches that are effective versus that are not effective are comprehensive and valuable. Figure 3.1 depicting changes in gait patterns associated with falls is helpful in seeing the multiple risk factors related to walking. This diagram is written for the healthcare worker with basic anatomy knowledge, thus useful for many levels and multidisciplinary. Figure 13.2 highlighting the dynamic coefficient of friction provides a valuable resource that could be modified for patient education about fall risk and shoes. However, figure 12.3 uses an unconventional method of reporting data on exercise interventions that is difficult to interpret.
Assessment: This book fills a gap by providing a valuable evidence-based comprehensive resource specifically focused on falls. I am familiar with the literature in this area and found this book to be comprehensive, while at the same time user friendly. This is a valuable addition to the body literature on falls in older persons.
From the Publisher
'I have nothing but praise for this monograph. The Australian authors - a physiologist, a physiotherapist and a lecturer in foot mechanics and gerontology - recognized that textbooks have dealt with falls superficially and that no-one had methodically analysed and interpreted the published work. They write elegantly and apply academic rigour to the data, highlighting the gaps and uncertainties in our knowledge and generously providing many research ideas for readers to pursue.' Journal of the Royal Society of Medicine

'The quality of the book is good and it is a good buy for psychiatrists, primary care physicians, geriatricians, orthopaedic surgeons, physical and occupational therapists and domiciliary nurses.' Saudi Medical Journal

'This work bridges the gap between highly specialised journal articles and the often sketchy and superficial chapters on this topic that appear in many textbooks. It is clearly written and can be highly recommended to students, medical practitioners (including geriatricians and rheumatologists), nurses, physiotherapists and occupational therapists, and research workers in the field of gerontology and geriatrics.' Steven Boonen, Clinical Rheumatology

'… provides all the information in a very handy and readable form that anyone setting up a falls clinic could wish for … this is a book written by experts who have first hand experience of the academic and practical issues involved in identifying patients at risk and the interventions needed to prevent further falls. I strongly recommend it, not just to clinicians, but to nurses, physiotherapists, occupational therapists, podiatrists, and indeed anyone with a professional interest in this problem.' P. W. Overstall, Gerontology

'… a stimulating and valuable book.' Janet M. Simpson, Journal of Ageing and Society

'This book … guides the reader through the maze of falls management. It is a useful resource for those interested in falls management and also a stepping stone for those wanting to explore the falls research literature further. It is one of the most important evidence-based texts focusing on falls in older people to emerge in recent years … this book is meticulously researched and is a very welcome addition to the vast literature on falls prevention.' British Journal of Occupational Therapy

'Whom will this book benefit? All to whom the care of the elderly is entrusted on a regular and continuing basis … it is well produced and printed.' Roy Archibald, Ergonomics

'… an excellent piece of equipment for any researcher of falls.' RACP News

'The book is extremely easy for readers to use, whatever their needs. It is very well written, readable and logically structured. … a valuable update of an excellent resource …' Journal of Ageing and Society

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Product Details

  • ISBN-13: 9780521680998
  • Publisher: Cambridge University Press
  • Publication date: 3/28/2007
  • Edition description: Revised Edition
  • Edition number: 2
  • Pages: 408
  • Product dimensions: 6.85 (w) x 9.72 (h) x 0.83 (d)

Meet the Author

Stephen Lord is a Principal Research Fellow at the Prince of Wales Medical Research Institute in Sydney, Australia. Born 1957.

Catherine Sherrington is NHMRC Australian Research Training Fellow at the School of Public Health, University of Sydney, Australia. DOB 29 Feb 1968.

Hylton Menz is NHMRC Australian Clinical Research Fellow at the Musculoskeletal Research Centre, La Trobe University, Australia. DOB 8 June 1972.

Jacqueline Close is a Consultant in Geriatric Medicine at Prince of Wales Hospital, Sydney, Australia. DOB 18 Nov 1965.

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Read an Excerpt

Cambridge University Press
978-0-521-68099-8 - FALLS IN OLDER PEOPLE - Edited by Stephen R. Lord, Catherine Sherrington, Hylton B. Menz and Jacqueline C. T. Close
Excerpt



Part I

Epidemiology and risk factors for falls




1

Epidemiology of falls and fall-related injuries

In this chapter, we examine the epidemiology of falls in older people. We review the major studies that have described the incidence of falls, the locations where falls occur and falls sequelae. We also examine the costs and services required to treat and manage falls and fall-related injuries. Before addressing these issues, however, it is helpful to briefly discuss four important methodological considerations that are pertinent to all research studies of falls in older people: how falls are defined, how falls are counted, how injurious falls are defined and what constitutes an older person.

The definition of a fall

In 1987, the Kellogg International Working Group on the Prevention of Falls in the Elderly defined a fall as ‘unintentionally coming to the ground or some lower level and other than as a consequence of sustaining a violent blow, loss of consciousness, sudden onset of paralysis as in stroke or an epileptic seizure’ [1]. Since then, many researchers have used thisor very similar definitions of a fall. The Kellogg definition is appropriate for studies aimed at identifying factors that impair sensorimotor function and balance control, whereas broader definitions that include dizziness and loss of consciousness are appropriate for studies that also address cardiovascular and neurological causes of falls such as syncope, postural hypotension and transient ischaemic attacks.

More recently, the Prevention of Falls Network Europe (ProFaNE) collaborators, in conjunction with international experts in the field and using consensus methodology, have adopted a simpler definition to include falls that occur from all causes, i.e. ‘an unexpected event in which the participant comes to rest on the ground, floor or lower level’ [2]. A comparable definition has also been adopted by the World Health Organization.1 This simple definition is appropriate for multi-centre studies requiring a core data set or for situations where details of falls are unrecorded (routine surveillance data/accident records), or where a high proportion of subjects cannot provide reliable information about their falls (i.e. those with delirium or cognitive impairment).

Although falls are often referred to as accidents, it has been shown statistically that falls incidence differs significantly from a Poisson distribution [3]. This implies that causal processes are involved in falls and that they are not merely random events.

Falls ascertainment

The earliest published studies on falls were retrospective in design, in that they asked subjects whether and/or how many times they had fallen over in a defined period of time – usually 12 months. This approach has limitations in that subjects have limited accuracy in remembering falls over a prolonged period [4]. More recent studies have used prospective designs, in which subjects are followed up for a period, again usually 12 months, to more accurately determine the incidence of falling. Not surprisingly, these studies have usually reported higher rates of falling. In community studies, the only feasible method of ascertaining falls is by self report and a number of methods have been used to record falls in prospective follow-up periods. These include monthly or bi-monthly mail-out questionnaires [5, 6], weekly [7] or monthly falls calendars [8] and monthly telephone interviews [9].

The ProFaNE collaborators recommend that falls should be recorded using prospective daily recording and a notification system with a minimum of monthly reporting [2]. Telephone or face to face interview should be used to chase missing data and to ascertain further details of falls and injuries. Specific information about the circumstances of any falls can also be ascertained with additional questions on the falls diary forms. An example of a monthly falls calendar is shown in Figure 1.1a, with additional questions in Figure 1.1b. Telephone interviews gain the same information as mail-out questionnaires and falls diaries, but may require many calls to contact active older people. In research studies, fall data should be summarized as: number of falls; number of fallers/non-fallers/frequent fallers; and fall rate per person years [2].

However, even with the most rigorous reporting methodology, it is quite likely that falls are under-reported and that data regarding circumstances surrounding falls are sometimes incomplete or inaccurate. After a fall, older people are often shocked and distressed and may not remember the predisposing factors that led to the fall. Denial is also a factor in under-reporting, as it

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Fig. 1.1a Example of a monthly falls diary.

is common for older people to lay the blame on external factors for their fall, and not count it as a ‘true’ one. Simply forgetting falls leads to further under-reporting, especially in those with cognitive impairment.

In residential aged care settings, the use of falls record books maintained by nursing staff can provide an ancillary method for improving the accuracy of recording falls. In a study of intermediate care (hostel) residents in Sydney, we found that systematic recording of falls by nurses increased the number of falls reported by 32% [5]. In hospitals, falls incident forms are now commonly used.

The definition of a fall-related injury

The definitions of injurious falls have differed considerably in the literature, due primarily to whether or not minor injuries such as bruises, cuts and abrasions have been classified as fall-related injuries. The ProFaNE collaborators recommend that due to difficulties in standardizing definitions and classifications of fall injury type, the most rigorous definition of a serious fall-related injury is radiologically confirmed peripheral fracture, i.e. fractures of the limbs and limb girdles [2].

The definition of the older person

There is no consistency among studies as to what demographic group constitutes older people. The term is used for age-groups starting from as low as 50 years. However, the most frequently used definition is people aged 65 years and over. Within this age-band, commonly accepted subgroups are those aged 65–74 years, 75–84 years and 85 years and older.

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Fig. 1.1b Example of additional questions seeking specific information about the circumstances of falls.

The incidence of falls in older people

Community-dwelling older people

In 1977, Exton-Smith examined the incidence of falls in 963 people over the age of 65 years living in England [10]. He found that in women, the proportion that fell increased with age from 30% in the 65–9 year age group to over 50% in those over the age of 85. In men, the proportion that fell increased from 13% in the 65–9 year age group to levels of approximately 30% in those aged 80 years and over.

Retrospective community studies in primarily White populations undertaken since Exton-Smith’s work have reported similar findings – that approximately 30% of older persons experience one or more falls per year [11–13]. Campbell et al. [11] analysed a stratified population sample of 533 subjects aged 65 years and over, and found that 33% experienced one or more falls in the previous year. Blake et al. [13] reported a similar incidence (35%) in a study of 1042 subjects aged 65 years and over. In a large study of 2793 subjects aged 65 years and over, Prudham and Grimley-Evans [12] estimated an annual incidence for accidental falls of 28%, a figure identical to that found in

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Fig. 1.2 Proportion of older women who took part in the Randwick Falls and Fractures Study who reported falling once, twice, or three or more times in a 12 month period. Diagram adapted from Lord et al. [15].

the Australian Dubbo Osteoporosis Epidemiology Study of 1762 older people aged 60 years and over [14].

More recent prospective studies undertaken in community settings have found higher falls incidence rates. In the Randwick Falls and Fractures Study conducted in Australia, we found that 39% of 341 community-dwelling women aged 65 years and over reported one or more falls in a one-year follow-up period [15]. In a large study of 761 subjects aged 70 years and over undertaken in New Zealand, Campbell et al. [16] found that 40% of the 465 women and 28% of the 296 men fell at least once in the study period of one year, an overall incidence rate of 35%. In the United States, Tinetti et al. [8] found an incidence rate of one or more falls of 32% in 336 subjects aged 75 years and over. Similar rates have been reported in Canada by O’Loughlin et al. [9] in a 48-week prospective study of a random sample of 409 community-dwelling people aged 65 years and over (29%), and in Finland community-dwelling people aged 70 years and over by Luukinen et al. in 833 from five rural districts (30%) [17].

Fall rates also increase beyond the age of 65 years. Figure 1.2 shows the proportion of women who took part in the Randwick Falls and Fractures Study [15] who reported falling once, twice, or three or more times in a 12 month period.

The prospective studies that have reported the incidence of multiple or recurrent falls are also in agreement. The incidence of two or more falls in a follow-up year reported in five studies ranges between 11% and 21% (average 15%). Three studies have reported data for three or more falls and all report an incidence of 8%.

Rigorous data regarding falls incidence in older people from non-White populations is limited. However, studies of fall rates in Japanese people living in both Japan and Hawaii reveal a contrasting picture to that of White populations. Aoyaga et al. [18] studied falls among 1534 (624 men, 910 women) community-dwelling people aged 65 years and over in Japan. They found that only 9% of the men and 19% of the women reported one or more falls in the previous year. Similarly low incidence rates have also been found in seven other large community studies undertaken in Japan [19]. As part of the Hawaii Osteoporosis Study, Davis et al. prospectively assessed falls incidence among older Japanese men and women living in Hawaii [20]. The falls incidence rates were 13.9 per 100 person years for men and 27.6 per 100 person years for women, representing about half the fall rates of comparable studies in predominantly White populations.

In a subsequent study, Davis et al. attempted to identify neuromuscular performance measures and functional disabilities that could account for such differences in fall rates [21]. They found that the Japanese women had faster walking speeds, chair stands and performed better on a series of balance tests. On the other hand, the White women had greater strength, particularly of the quadriceps, and faster hand and foot reaction times. After adjusting for the neuromuscular test results and the number of functional disabilities, the odds ratio for the risk of falls remained essentially the same. It is possible that the better performances in the more functional strength and balance tests that translate more directly to activities of daily living could explain the lower risk of falls among Japanese women.

Finally, Ellis and Trent compared risks for falls and their consequences among 104 902 people from four major race/ethnic groups who were admitted to non-federal hospitals in California from 1995 to 1997 [22]. Rates per 100 000 for the same level hospitalized fall injuries for Whites (161) were distinctively higher than for Blacks (64), Hispanics (43) and Asian/Pacific Islanders (35). Whites were also more likely to have suffered a fracture and to be discharged to long term care, suggesting poorer outcomes and greater injury severity. It is possible that differing levels of bone density, medical insurance and family support may account for some of these differences observed among the groups.

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Fig. 1.3 Deaths from accidental falls – annualized monthly ratios; 1993–7 [23].

Seasonal variations in falls frequency

It is possible that the ambient temperature may lead to a seasonal variation in the incidence of falls. People tend to hurry more in colder weather, and mild hypothermia and slowed responses are more common. Equally, people tend to be less active in winter, the hours of daylight are shorter and vitamin D deficiency is more likely. There appears to be a seasonal variation in deaths from accidental falls as illustrated in Figure 1.3 which shows annualized monthly ratios in England and Wales for 1993–7 [23].

In a Finnish study, Luukinen et al. found that the incidence of outdoor falls was higher in periods of extreme cold [24]. However, there was no association between indoor falls and temperature which they attributed to adequately heated houses. A similar study in the UK found that apart from the presence of ground frost, there was no significant association between the prevailing weather conditions and the incidence of hip fractures [25]. The precise effect of seasonal change on the epidemiology of falls is therefore somewhat unclear.

Secular trends in falls injuries

Two recent studies have examined routinely collected fall injury data as a means of assessing secular trends in falls incidence. In Finland, Kannus et al. analysed




© Cambridge University Press
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Table of Contents

Part I. Epidemiology and Risk Factors for Falls: 1. Epidemiology of falls and fall-related injuries; 2. Postural stability and falls; 3. Gait patterns and falls; 4. Sensory and neuromuscular risk factors for falls; 5. Psychological factors and falls; 6. Medical risk factors for falls; 7. Medications as risk factors for falls; 8. Environmental risk factors for falls; 9. The relative importance of falls risk factors - an evidence-based summary; Part II. Strategies for Prevention: Overview: falls prevention; 10. Exercise interventions to prevent falls; 11. Exercise interventions to improve physical functioning; 12. Medical management of older people at risk of falls; 13. Assistive devices and falls prevention; 14. Modifying the environment to prevent falls; 15. Prevention of falls in hospitals and residential aged care facilities; 16. A physiological profile approach to falls risk assessment and prevention; 17. Falls prevention strategies - from research into practice; Part III. Research Issues in Falls Prevention: 18. Falls in older people: future directions for research.

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