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Sleep apnoea in older people

M. Glasser, N. Bailey, A. McMillan, E. Goff, M.J. Morrell
Breathe 2011 7: 248-256; DOI: 10.1183/20734735.021910
M. Glasser
National Heart and Lung Institute, Imperial College, Biomedical Research Unit at the Royal Brompton, and Harefield NHS Foundation Trust, London, UK
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N. Bailey
National Heart and Lung Institute, Imperial College, Biomedical Research Unit at the Royal Brompton, and Harefield NHS Foundation Trust, London, UK
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A. McMillan
National Heart and Lung Institute, Imperial College, Biomedical Research Unit at the Royal Brompton, and Harefield NHS Foundation Trust, London, UK
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E. Goff
National Heart and Lung Institute, Imperial College, Biomedical Research Unit at the Royal Brompton, and Harefield NHS Foundation Trust, London, UK
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M.J. Morrell
National Heart and Lung Institute, Imperial College, Biomedical Research Unit at the Royal Brompton, and Harefield NHS Foundation Trust, London, UK
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  • For correspondence: m.morrell@imperial.ac.uk
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Abstract

Educational Aims

  • To provide a comprehensive, up-to-date review of the prevalence of obstructive sleep apnoea in older people

  • To describe the mechanisms of central and obstructive sleep apnoea in older people

  • To outline the symptoms of sleep apnoea in older people

  • To discuss the evidence base for the treatment of obstructive sleep apnoea syndrome in older people.

Summary Obstructive sleep apnoea is a common disorder in older people, with between 13 and 32% of people over 65 yrs old having some sleep apnoea. The variation in the estimated prevalence is likely to reflect the different health status of the older populations studied and the definitions of the disease. This review will address the prevalence and aetiology of sleep apnoea in older people; outlining the possible consequences and treatment options. Age-related changes in chemosensitivity, and sleep architecture may promote central sleep apnoea in older people; while obstructive sleep apnoea is likely to be the result of increased collapsibility of the upper airway; possibly due to changes in upper airway anatomy and muscle function. The consequences of sleep apnoea in older people are unclear, since both sleep apnoea and aging reduce sleep quality and cognitive function. Moreover, there may be a survival advantage of mild sleep apnoea on the cardiovascular system in older people. Therefore the therapeutic advantages of continuous positive airway pressure in older people require further investigation. If future studies demonstrate that continuous positive airway pressure therapy produces a therapeutic benefit in older people this could result improvements in care.

Introduction

The world's population is ageing and by 2045, the number of older people (≥60 years of age) will be greater than the number of children (<15 years of age) [1]. In Europe, this historical crossover occurred in 1995 due to long-term reductions in fertility and mortality, and by 2050, the ratio of older people to children will be 2:1 (fig. 1). This situation poses major social and economic challenges across Europe. For example, in the UK, the additional cost of long-term care will be approximately £4 billion per annum by the year 2040, which is a 60% increase on current budgets [2]. Therefore, strategies to reduce age-related health care costs are vital. One approach could be to promote healthcare that maintains the independence of older people. Obstructive sleep apnoea (OSA) is a potential therapeutic target [3].

Figure 1
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Figure 1

The European population from 1950 to 2050, with estimated population before 2006 (light background) and projected population (dark background). The population is split into children (0–14 yrs; ⋄), adult (15–59 yrs; □) and older people (≥60 yrs; ▵). The older population is expected to increase in the future, whereas the population <60 years of age is expected to decrease. Reproduced and modified from [1] with the publisher's permission.

OSA occurs due to a loss of pharyngeal dilator muscle tone and increased extra luminal pressure during sleep, producing pharyngeal airway narrowing and occlusion that results in hypopnoeas and apnoeas in susceptible individuals [4]. Each respiratory event is associated with hypoxaemia, and is usually terminated by a brief arousal from sleep, which in turn leads to acute surges in blood pressure [5] and the cardinal symptom of sleep apnoea: excessive daytime sleepiness [6]. The longer term implications of severe OSA include an association with an increased risk of death [7, 8], specifically due to coronary heart disease [9], with severe OSA patients having a three-fold increased likelihood of developing hypertension over 4 years, independent of other risk factors [10]. OSA patients also have an increased risk of stroke [8, 11–12], with the 10-year predicted occurrence of stroke being 14% [13]. Patients with OSA syndrome (which is OSA plus symptoms of sleepiness) are two to four times more likely to have road traffic accidents as a result of reduced alertness while driving [14, 15], and possible neurological impairment [16]. This review will address the prevalence and aetiology of sleep apnoea in older people, outlining the possible consequences and treatment options.

Since older people do not always report sleepiness, we have used the term sleep apnoea, rather than obstructive sleep apnoea/hypopnoea syndrome in this article, unless stated otherwise.

The prevalence of sleep apnoea in older people

The prevalence of OSA, defined as an apnoea–hypopnoea index (AHI) >10 events per h, in a working population of people 30–39 years of age, is 5% in females and 12% in males [17]. In older people (>65 yrs), the prevalence of sleep apnoea is at least two-fold greater, with estimates ranging between 13 and 32% [18–23]. The wide variation in these estimates is likely to reflect the different health status of the older populations studied and the definitions of the disease. A detailed breakdown of the prevalence of sleep apnoea in older people is shown in table 1. Using similar study methods and disease criteria, Bixler et al. [20] found the prevalence of sleep apnoea to be 24% in community-dwelling older men (65–100 years of age) compared with 3% in a younger population (20–44 years of age). The high prevalence of sleep apnoea in older people has led to a debate regarding its causes and consequences in the elderly [36, 37].

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Table 1 A review of the literature describing the prevalence of sleep apnoea in older people

Aetiology of sleep apnoea in older people

In young healthy individuals, sleep onset is associated with a 10–15% reduction in ventilation [38, 39], due in part to a removal of the wakefulness drive to breath, a reduction in chemosensitivity [40]. The sleep-related reduction in ventilation enables arterial carbon dioxide tension to rise above the hypocapnic apnoeic threshold stabilising breathing during sleep [41]. Several factors can further augment the reduction in ventilation during sleep by increasing the amount of airway narrowing, such as obesity, craniofacial abnormalities and enlargement of upper airway soft tissue structure 42. This section considers how aging may influence the pathophysiology of sleep apnoea.

Mechanisms of central sleep apnoea in older people

Age-related changes in the control of breathing at sleep onset could, in theory, increase the prevalence of sleep apnoea in older people [43]. However, careful studies of sleep-related changes in chemosensitvity, controlling for any age-related increase in pharyngeal resistance to airflow, indicate that aging per se does not promote central sleep apnoea [44]. Indeed, the central control of breathing is relatively stable in older people [45].

An alternative explanation for the increased prevalence of sleep apnoea in older people is that the prevalence of comorbidities associated with sleep apnoea is higher in older people; for example, chronic heart failure [46]. Indeed it is estimated that ≤50% of heart failure patients will have sleep-related breathing disorders [47], but other disorders, such as diabetes and renal failure, also have high prevalence of sleep apnoea and are increased in older people.

Another factor that may predispose older people to sleep apnoea is the age-related increase in arousal frequency [48–50]. Arousal from sleep leads to hyperventilation and relative hypocapnia, which can promote respiratory instability and periodic breathing during the subsequent period of sleep onset. A tight correlation between fluctuations in the electroencephalogram frequency and breathing patterns in older people appears to support this notion [51].

Mechanisms of obstructive sleep apnoea in older people

Although the prevalence of central sleep apnoea is increased in older people, the majority of sleep-disordered events are obstructive. The increase in OSA may be due to a generalised age-related decrease in the size of the upper airway lumen in older people, specifically in males [52]. Structural changes to the dimensions of the upper airway include a lengthening of the pharyngeal airway in both males [53] and females [54], and the descent of the hyoid bone [55], particularly in individuals with long faces [56], leading to an increase in pharyngeal resistance. It is interesting that, even in healthy elderly people, pharyngeal resistance is increased compared with that in younger people, indicating a predisposition to airway collapse (fig. 2) [43].

Figure 2
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Figure 2

Traces of breathing in a young (top) and older (bottom) person during wakefukness (left) and sleep (right). Each trace shows airflow (measured using a phenunotachograph) plotted against resistive pressure (measured using an oesophageal catheter) for several breaths. Breathing during sleep results in marked airflow limitation, due to upper airway collapse in the the older person. Modifed from [44] with permission from the publisher.

The collapsibility of the pharyngeal airway is determined by the transmural pressure across the airway, which is, in turn, influenced by the extraluminal pressure. Fat tissue around the airway is a key factor in the development of OSA in middle-aged people [42, 57], and neck circumference has been shown to be a significant risk factor [58], although older people with OSA typically have a lower body mass index (BMI) and neck circumference, compared with younger patients with similar disease severity [59].

Functionally, the response of the genioglossus muscle to negative pressure applied during wakefulness [54] and sleep [60] is reduced in older people compared with younger people [61]. The response to hypoxia is also reduced [62]. Overall, these changes result in reduced respiratory pump and upper airway muscle function at sleep onset [63], and a more collapsible upper airway [64], with the critical closing pressure being −8.3±2.3 cmH2O in older people, compared with −16.0±6.9 cmH2O younger people, independent of BMI [58]. This increased collapsibility of the pharyngeal airway in older people may be the explanation for the reduced continuous positive airway pressure (CPAP) requirements recorded in one study of in older patients presenting at a sleep clinic with obstructive sleep apnoea syndrome. The therapeutic level of CPAP being, on average, 2.5 cmH2O less than in younger OSA patients with matched disease severity (mean±sd CPAP level: older patients 6.9±1.9 cmH2O; younger patients 9.4±3.5 cmH2O) [65].

The symptoms of sleep apnoea in older people

The symptoms of OSA in older people are similar to and could be confused with some of the functional impairments of ageing. Both OSA and ageing led to poor sleep, cognitive dysfunction and increased cardiovascular morbidity.

Sleepiness

Sleep becomes more fragmented with age, independent of sleep apnoea [48–50], and there is a well documented age-related reduction in sleep quality [66, 67]. These features of sleep in older people have led to the suggestion that older OSA patients may be habituated to the added disease-related sleep disruption of OSA and, therefore, do not suffer symptoms of daytime sleepiness in the same way as younger patients. In the large epidemiological study (Sleep Heart Health Study; n = 5,407) of community-dwelling adults (mean age 63 years, range 45–99 years) showed that age was associated with a reduction in subjective sleepiness, measured using the Epworth Sleepiness Scale (ESS) in females, but not in males (ESS in young (39–40 years of age) versus older (≥80 years of age) subjects: females 7.4±4.4 versus 6.5±4.0; males 7.3±4.3 versus 7.7±4.7 [68]). Assuming age was associated with an increased prevalence of OSA, these data could be interpreted as support for the notion that older OSA patients are less sleepy than younger patients. Although in another study comparing older people with and without OSA (defined as an AHI > 10–15 events per h), patients with OSA were more sleepy than those without OSA [69]. In older OSA patients recruited from sleep clinics, subjective daytime sleepiness was found to be similar to that experienced by younger patients matched for disease severity and BMI in one study [44] and less in another [59]. Thus, the current information on the symptoms of sleepiness in older people with OSA is unclear.

Cognitive dysfunction

A decline in cognitive function is considered part of the aging process; particularly affected is the ability to encode new memories [70]. OSA has also been shown to be associated with cognitive dysfunction [71–76]; however, few studies have included older OSA patients. Mathieu et al. [77] found cognitive dysfunction was independently related to both OSA severity and increasing age, but the coexistence of both factors did not result in increased cognitive dysfunction. Ayalon et al. [78] showed cognitive dysfunction, on performance of the Go-No-Go cognitive task, in older OSA subjects, but no significant impairment when OSA and increasing age were considered separately. Finally, Cohen-Zion et al. [79, 80] used the mini-mental state examination to study the effects of OSA on cognitive function in older patients and found a significant association between the severity of OSA and the self-reported severity of daytime somnolence but, again, once other variables (including total sleep time) were included in the model, only the relationship between cognitive impairment and excessive somnolence remained significant.

When cognitive function is preserved in OSA patients, functional brain imaging has revealed that brain activation is increased, compared with the activation that occurs in healthy controls performing the same task. The association between preserved cognitive function, and greater activation in OSA patients suggests that increased cerebral recruitment is required to maintain cognitive performance [81]. Similar preservation of cognitive function, with compensatory increased cerebral activation, has been found in older subjects; however, older patients with coexistent OSA show decreased cerebral activation and cognitive dysfunction [78]. This suggests that age and OSA could have synergistic effects on cerebral activation and consequently cognitive function.

Acute cardiovascular consequences of sleep apnoea in older people

Acute surges in blood pressure and heart rate associated with arousal at the termination of an apnoeic event have been implicated in the increased prevalence of hypertension in patients with sleep apnoea [10, 82]. In older people with sleep apnoea, the risk of having hypertension is no greater than for older people without the disorder [22]. This may be a consequence of the age-related shift in sleep apnoea characteristics described earlier. For example, a recent study has shown that older people have a reduced acute cardiovascular response to arousal from sleep, compared with younger people [83]. Thus, the poorer cardiovascular reactivity of older adults may, paradoxically, reduce the impact of arousals from sleep and protect against cardiovascular morbidity and mortality. However, it is important to remember that the cardiovascular consequences of sleep apnoea in older people may also be influenced by survival bias, as middle-aged, hypertensive OSA patients may not survive into old age.

Treatment of sleep apnoea in older people

OSA syndrome can be effectively treated with CPAP. The recent National Institute of Clinical Excellence (NICE) Health Technology Appraisal reviewing the use of CPAP concluded that it was an effective and cost-efficient treatment for middle-aged people with OSA syndrome [84].

The large therapeutic benefit of CPAP therapy is typically measured as an improvement in sleepiness. Using the ESS as a measure of subjective sleepiness, the mean difference between patients treated with CPAP versus conservative (or placebo) treatment was a reduction of 2.7 points (95% CI −3.45– −1.96 points); in patients with severe symptoms, the treatment effect was greater (mean difference in ESS −5.0, 95% CI −3.0– −1.6) [84]. In older people who may be less sleepy, the CPAP treatment benefits may differ.

The specific cost of CPAP therapy is less than £4,000 per quality-adjusted life-year (QALY) gained, allowing for changes in sleepiness, quality of life, vascular risk, driving performance and CPAP costs [84]. However, in older people with reduced symptoms of sleepiness, vascular risk, and a shorter life expectancy, the cost per QALY gained with CPAP may fall. Therefore the benefits of CPAP treatment cannot be presumed to be replicated in older people without an evidence base.

Systematic literature searches show that the available trial evidence for the efficacy of CPAP therapy is almost entirely from the middle-aged [84], with few trials in older people [85]. Likewise, there is limited information on CPAP treatment adherence in older people. Retrospective data suggest that CPAP compliance is similar in older and younger OSA patients, with 64% of older people being able to tolerate CPAP [86].

Conclusion

Our review has revealed a paucity of data in older patients with sleep apnoea. Since the European population is aging, this represents a research challenge for the field. If future studies demonstrate that CPAP therapy produces a therapeutic benefit at the level of the individual patient, this could result in significant changes in the care of older people with OSA.

Acknowledgements

The authors wish to thank R. Riha (co-principal investigator) and the PREDICT Team (a randomised controlled trial of CPAP in older people with obstructive sleep apnoea/hypopnoea syndrome: ISRCTN 90464927) for their input into the writing of this review.

Footnotes

  • Competing interests

    M.J. Morrell has received an educational grant from ResMed inc. and payments for speaking from UCB Pharma

  • ©ERS 2011

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Sleep apnoea in older people
M. Glasser, N. Bailey, A. McMillan, E. Goff, M.J. Morrell
Breathe Mar 2011, 7 (3) 248-256; DOI: 10.1183/20734735.021910

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Sleep apnoea in older people
M. Glasser, N. Bailey, A. McMillan, E. Goff, M.J. Morrell
Breathe Mar 2011, 7 (3) 248-256; DOI: 10.1183/20734735.021910
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  • Article
    • Abstract
    • Introduction
    • The prevalence of sleep apnoea in older people
    • Aetiology of sleep apnoea in older people
    • The symptoms of sleep apnoea in older people
    • Treatment of sleep apnoea in older people
    • Conclusion
    • Acknowledgements
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