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Screening and treatment of hypertension in older adults: less is more?

Public Health Reviews volume 39, Article number: 26 (2018) Cite this article

Abstract

Screening and treatment of hypertension is a cornerstone of cardiovascular disease (CVD) prevention. Hypertension causes a large proportion of cases of stroke, coronary heart disease, heart failure, and associated disability and is highly prevalent especially among older adults. On the one hand, there is robust evidence that screening and treatment of hypertension prevents CVD and decreases mortality in the middle-aged population. On the other hand, among older adults, observational studies have shown either positive, negative, or no correlation between blood pressure (BP) and cardiovascular outcomes. Furthermore, there is a lack of high quality evidence for a favorable harm-benefit balance of antihypertensive treatment among older adults, especially among the oldest-old (i.e., above the age of 80 years), because very few trials have been conducted in this population. The optimal target BP may be higher among older treated hypertensive patients than among middle-aged. In addition, among frail or multimorbid older individuals, a relatively low BP may be associated with worse outcomes, and antihypertensive treatment may cause more harm than benefit. To guide hypertension screening and treatment recommendations among older patients, additional studies are needed to determine the most efficient screening strategies, to evaluate the effect of lowering BP on CVD risk and on mortality, to determine the optimal target BP, and to better understand the relationship between BP, frailty, multimorbidity, and health outcomes.

Background

Screening and treatment of hypertension is a cornerstone of the prevention of cardiovascular disease (CVD), which is the leading cause of death and hospitalization worldwide [1]. Hypertension causes a large proportion of stroke, coronary heart disease, heart failure, and associated disability [2]. Currently, one quarter to one third of the adult population in the USA and in European countries have hypertension [3, 4]. Because blood pressure (BP) increases with age [5], and as a result of population aging [1], the prevalence of hypertension is expected to increase in the coming decades and a rapidly growing number of older adults will have to be managed for hypertension. This constitutes a true public health challenge for healthcare providers, who are in need of evidence-based clinical guidance.

While there is high quality evidence to guide screening and treatment of hypertension for the prevention of CVD in middle-aged adults, little evidence exists among older adults. Few trials have been conducted in this population [6,7,8,9], especially among the oldest-old, i.e., aged above 80 years. Further, there are conflicting observations about the relationship between BP and health outcomes among older adults, some cohort studies having shown that low BP could be detrimental especially among the oldest frail or multimorbid adults [10, 11].

In this review, we aimed to critically appraise evidence and guidelines for screening and treatment of hypertension in older patients, with an emphasis on the oldest-old, multimorbid, and frail patients. Due to the broadness of the field, we did not conduct a systematic review, better designed to address relatively narrow research questions, and rather preferred to conduct a narrative review, better suited to provide interpretation and critique of evidence [12]. First, we looked for data on how BP and hypertension relate to age, health outcomes, and mortality among older individuals. Second, we searched for experimental and observational evidence on the relationship between BP, antihypertensive treatments, and health outcomes in older adults, accounting for different health status, notably for frailty [13]. Finally, we critically appraised recommendations from major hypertension management guidelines for older adults.

Epidemiology of blood pressure and hypertension-related mortality across ages

BP increases steadily with age [5], and consequently, the prevalence of hypertension is higher in older age groups [14]. Hypertension is diagnosed by sustained elevated BP, with a threshold usually set at 140/90 mmHg (based on office measurement) [6,7,8,9], although recent guidelines set the diagnostic threshold at lower BP levels [15]. In the USA and in European countries, one quarter to one third of the general population would have hypertension [3, 4]. Many epidemiologic studies have shown that systolic blood pressure (SBP) increases with age while diastolic blood pressure (DBP) increases up the age of 60–70 years and decreases with older age (Fig. 1) [16, 17]. In some countries, up to 75% of older adults are hypertensive [3, 14, 18] (Fig. 2). Middle-aged adults most often develop systolo-diastolic hypertension, whereas older adults develop predominantly isolated systolic hypertension (defined as SBP ≥ 140 mmHg and a DBP < 90 mmHg) [19].

Fig. 1
figure1

Mean SBP and DBP according to age. The data was extracted from the National Health and Nutrition Examination Survey held in the USA between 2013 and 2014. Source: Centers for Disease Control and Prevention [18, 68]

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Fig. 2
figure2

Hypertension prevalence according to sex in the USA over the years 2011 to 2014. The data was extracted from the National Health and Nutrition Examination Survey held in the USA between 2011 and 2014. Source: Centers for Disease and Prevention [14]

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Hypertension is a major cause of CVD and mortality [20]. A large meta-analysis including 61 prospective studies and analyzing data from one million adults aged between 40 and 89 years demonstrated a strong positive log-linear relationship between BP and both cardiovascular and all-cause mortality across all age groups [5, 21]. Further, in all age groups, the risk was the lowest at 115/75 mmHg [5]. A log-linear relationship between BP and cardiovascular health outcomes was also observed in several other studies [21,22,23]. A key to better understand the relationship between BP and health outcomes among older adults is to account for the very high absolute risk of CVD in this population [21, 23]. This means that among older adults, a BP difference of 10 mmHg, for instance, is associated with a much larger difference in absolute risk of CVD compared to the same BP difference among younger adults [5]. Consequently, the potential absolute benefit of reducing BP could be much higher among older adults, and more so among oldest-old patients. The relationship between BP and cardiovascular health outcomes is however much more complex among the oldest-old, as discussed in detail below.

Measurement of blood pressure and screening for hypertension in older adults

Methods of BP measurement in older adults are roughly similar to the methods in middle-aged adults, but closer monitoring is recommended by several guidelines [6, 8, 15], especially because older adults tend to have higher BP variability [24]. Older adults also have more frequently isolated systolic hypertension [19]. In the office, BP is measured traditionally on the upper arm using either the auscultatory method (requiring adequate training of the assessor) or the oscillometric method (requiring a clinically validated automated measurement device) [8]. To diagnose hypertension, repeated BP measurements at multiple visits are needed. Out-of-office measurements, either using ambulatory BP monitoring (ABPM) or home BP monitoring (HBPM) [7, 8], are recommended to confirm diagnoses of hypertension, especially in older adults. Orthostatic hypotension is frequent among older adults, with up to 30% among those aged more than 70 years old, and can seriously complicate treatment of hypertension [25, 26]. Recent guidelines recommend searching systematically for orthostatic hypotension in older individuals [8].

Screening for hypertension is justified for several reasons. In general, screening aims to distinguish apparently healthy persons who probably have a disease from those who probably do not [27]. In the case of hypertension, screening aims to identify individuals with sustained elevated BP and who would benefit from treatment through a reduction in CVD risk. According to the Wilson and Jungner criteria [27], screening for hypertension in older adults can be easily justified (Table 1) because hypertension is highly prevalent and causes serious health issues, BP measurement is relatively simple, accessible and acceptable for older adults, and treatments are available and efficient to lower BP.

Table 1 Selected Wilson and Jungner screening criteria adapted to hypertension screening in older adults [27]
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There are however two major issues with hypertension screening in older adults. A first issue is the weak discriminative power of elevated BP for having or not CVD later in life [28]. While individuals with elevated BP have a higher relative risk of CVD, many cases of CVD will occur in individuals with normal BP. This is especially problematic for patients with BP close to the threshold above which a treatment is recommended, and many older adults have BP close to such threshold. To overcome this issue, two approaches are possible. The first approach is a high-CVD risk prevention strategy, where the decision to treat hypertension is not based on BP level, but rather on an estimated absolute CVD risk [29]. The idea is that, for the same BP reduction, the absolute benefit will be much higher among patients at high absolute CVD risk compared with patients at relatively low absolute CVD risk. In a simulation study, Karmali et al. determined that a treatment strategy based on absolute CVD risk would reduce the proportion of treated individuals by 29%, while preventing 16% more events for the same number of persons treated, compared to a treatment strategy based on treating everyone with SBP higher than 150 mmHg [30]. The second approach would be a population-based prevention strategy shifting the distribution of BP toward lower levels in the entire population, instead of lowering BP only in high-risk populations with high BP or high risk of CVD [23, 31].

Apart from the weak discriminative power of elevated BP, a second issue with BP screening among older adults is that the benefit of lowering BP among the oldest-old is disputable. While these patients are at very high risk for CVD, there are doubts about a true benefit of BP lowering drugs on mortality and other health outcomes. Instead of being beneficial, a low BP might indeed be detrimental among oldest-old patients [10].

Blood pressure and related outcomes: evidence from trials and cohort studies in oldest-old adults

The relationship between BP and mortality and other health outcomes in older age and the decision to treat or not oldest-old adults for hypertension is highly debated. In middle-aged adults, the risk for cardiovascular events, cardiovascular mortality, and all-cause mortality increases with increasing BP [5]. Likewise, numerous trials in middle-aged adults [32,33,34,35], and others like SHEP [36] and Syst-Eur [37], which enrolled participants 60 years and over, have shown that lowering BP with antihypertensive treatment reduces mortality and CVD risk.

In oldest-old adults, however, evidence about the predictive value of BP and the benefit-harm balance of treating hypertension is inconsistent [6,7,8,9]. On the one hand, two randomized controlled trials (RCTs)—SPRINT and HYVET—targeting older patients aged respectively 75 and 80 years old and over have shown the benefits of lowering BP by reducing mortality and CVD risk [38, 39]. On the other hand, several cohort studies of adults 80 years of age and over have shown that participants with low BP at baseline had higher all-cause mortality rates [40,41,42,43,44,45,46,47,48,49,50]. These findings suggest that lowering BP among the oldest-old might be harmful. Table 2 presents a detailed overview of these studies. Several cohort studies have also shown that low BP was associated with a decline in cognitive and physical abilities [51,52,53,54].

Table 2 Results from randomized controlled trials and cohort studies among oldest-old patients
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Several reasons could explain the discrepancies between the results from trials and from cohort studies, that is, (1) effect modification by frailty or other indicators of poor health, (2) confounding and reverse causality, and (3) selection of patients in trials (Table 3).

Table 3 Hypotheses on discrepancies between cohort studies and RCTs
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First, the association between BP and CVD risk may be modified by poor health, such as frailty [11]. Frailty is a multidimensional geriatric syndrome characterized by increased vulnerability and loss of adaptability to stress [55,56,57] (Table 4). For instance, in a study by Van Hateren et al., frail participants with high BP had lower all-cause mortality rates than frail participants with low BP [58]. In another study by Odden et al. walking speed—used as a frailty indicator—modified the association between BP and the risk of CVD [59]. Among slow walkers, high BP was not associated with higher cardiovascular mortality rates, while high BP was associated with higher CVD mortality rates among fast walkers. Other studies have shown that the relationship between BP and both mortality and adverse health outcomes could be modified by poor health, such as physical and mental impairment [45, 48]. In the two previously mentioned RCTs, HYVET and SPRINT, post hoc analyses however suggested that frailty does not modify the benefit of anti-hypertensive treatment [39, 60].

Table 4 Definition of frailty
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The modification of the association between BP and health outcomes in case of frailty or poor health may be explained by physiological reasons. Low BP in old and frail individuals might indeed cause hypo-perfusion of vital organs and accelerate physical and mental decline [11], a state of physiological weakness, which is often worsened by the presence of polypharmacy and comorbidity [10, 53]. Some authors suggest that the presence of frailty or other indicators of poor health might be an argument for deprescribing antihypertensive treatments (Table 5) [10, 24].

Table 5 Deprescribing antihypertensive treatment
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Second, the association of a lower BP with worse health outcomes in cohort studies may be due to confounding and reverse causality (Fig. 3). On the one hand, the association between BP and any adverse health outcomes may be confounded by some unmeasured factors. On the other hand, in a case of reverse causality, some conditions, which can be initially caused by high BP, evolve to become the cause of low BP. For example, high BP is a cause of heart failure [61], but in an advanced stage, heart failure becomes the cause of a lower BP. In this case, there is an association between low BP and the condition, as well as between low BP and mortality, but both these associations are the result of a reverse causality. This situation is frequent in circumstances of end-of-life care [42]. Finally, the selection of relatively healthy patients in randomized trials compared with cohorts may be a third explanation of the discrepancies between RCTs and cohort studies [10]. Post-randomization confounding may also bias results of RCTs [62].

Fig. 3
figure3

The hypothetical causal relationship between blood pressure (BP) and related adverse health outcomes or mortality according to different scenarios is depicted in these graphs. (I) Usually, BP has a causal effect on adverse health outcomes (O) and death (D). (II) The relationship can be confounded by unmeasured factors (C), which have an effect on both BP and the risk of adverse health outcomes. (III) In a situation of reverse causality, some conditions, which can be initially caused by high BP, evolve to become the cause of low BP

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To disentangle these complex controversies on the association between BP and health outcomes among older adults, hypertension trials targeting specifically frail or multimorbid older adults are needed.

International guidelines for hypertension management in older adults

International guidelines about screening for and treatment of hypertension are mainly targeting middle-aged adults (40–60 years). In line with the lack of strong evidence on the most adequate way of managing hypertension in older adults, especially over 80 years of age, there are no firm and consistent recommendations for this population (Table 6).

Table 6 Recommendations for older adults from recent international guidelines on screening for and treatment of hypertension
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The US Preventive Services Task Force (USPSTF) 2015 guidelines recommend screening for high BP among all adults aged 18 years or more [9]. The USPSTF does however not give any specific recommendation for older adults regarding screening and BP measurement. The European Society of Hypertension and the European Society of Cardiology (ESH/ESC) 2013 guidelines recommend out-of-office BP measurement in older adults to search for orthostatic hypotension [8]. Other international guidelines do not give any specific recommendations related to screening for hypertension among older adults [6,7,8] (Table 6).

Most guidelines recommend higher BP targets among older adults compared with middle-aged adults [6,7,8,9]. Further, some of these guidelines recommend taking into account health status to set the targeted BP [6, 8]. The USPSTF 2015 guidelines and the Eighth Joint National Committee (JNC 8) 2014 guidelines recommend targeting 150/90 mmHg from age 60 years, but they mention that, according to some expert opinion, 140/90 mmHg can be targeted, as in younger adults [7, 9]. The UK National Institute for Health and Care Excellence (NICE) 2011 guidelines recommend targeting 150/90 mmHg from age 80 years, although 140/90 mmHg can be targeted among patients without comorbidities [6]. The ESH/ESC guidelines 2013 recommend targeting an SBP < 140 mmHg in fit older adults up to 80 years of age and tailoring BP target according to individual tolerability in frail patients. Above 80 years of age, for patients in good physical and mental condition, the ESH/ESC guidelines 2013 recommend targeting an SBP of 140–150 mmHg. For frail patients, the decision whether or not to treat has to be evaluated by the physician, with a close monitoring of clinical effects of treatment [8].

The recent American College of Cardiology (ACC)/American Heart Association (AHA) guidelines 2017 recommend a more aggressive treatment compared with other guidelines [15]. The BP threshold to define hypertension was lowered to 130/80 mmHg, including for patients over 80 years of age [15]. However, a close BP monitoring in older persons with high comorbidity is recommended. This major change in the definition of hypertension is mainly based on the results from the SPRINT trial [39]. These new ACC/AHA guidelines received critiques from experts, questioning SPRINT’s methodology [63] and its generalizability [64]. Some experts consider that these guidelines downplay the adverse effects of antihypertensive treatment, such as falls due to hypotension [65] and the risk for overtreatment and polypharmacy [10, 66], especially in frail oldest-old patients [65]. In reaction, some experts have developed their own guidelines with more conservative treatment recommendations accounting for detrimental effects of low BP reported in cohort studies [67].

In summary, while international guidelines give clear recommendations about screening for and treatment of hypertension in middle-aged adults, the recommendations in older adults are much less clear, with large inconsistencies across different guidelines. This reflects the lack of clear evidence on the risks and benefits of BP treatment and on the optimal BP targets in older adults, especially for the frail and oldest-old patients.

Conclusion

Due to population aging, hypertension in older adults is a major and growing burden for the health care system. Screening and treatment of hypertension in older adults, and especially in the oldest-old, is still a matter of intense debate notably due to the lack of high quality evidence. Several important research questions have still to be addressed (Table 7), especially about the relationship between frailty, multimorbidity, BP, and associated health outcomes. While screening and treatment strategies accounting for general health status or frailty are appealing, it raises the question of how to assess these clinical features with confidence [56]. More broadly, various screening and treatment strategies should be evaluated and compared with a population-based approach aiming to find the most appropriate way of managing hypertension in older adults.

Table 7 Challenges and areas for research about screening and treatment of hypertension among older adults
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Abbreviations

ABPM:

ambulatory BP monitoring

ACC/AHA 2017:

American College of Cardiology and American Heart Association

ASCVD:

Atherosclerotic cardiovascular disease

BP:

Blood pressure

CVD:

Cardiovascular diseases

DBP:

Diastolic blood pressure

ESH/ESC:

the European Society of Hypertension and the European Society of Cardiology

HBPM:

Home BP monitoring

JNC 8:

Eighth Joint National Committee

NICE:

National Institute for Health and Care Excellence

SBP:

Systolic blood pressure

USPSTF:

US Preventive Services Task Force

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Affiliations

  1. Institute of Primary Health Care (BIHAM), University of Bern, Bern, Switzerland
    • Daniela Anker
    • , Cinzia Del Giovane
    • , Sven Streit
    • , Nicolas Rodondi
    •  & Arnaud Chiolero
  2. Institute of Social and Preventive Medicine (IUMSP), Lausanne University Hospital, Lausanne, Switzerland
    • Brigitte Santos-Eggimann
    •  & Arnaud Chiolero
  3. La Source, School of Nursing Sciences, University of Applied Sciences and Arts Western Switzerland, Lausanne, Switzerland
    • Valérie Santschi
  4. Department of Epidemiology, Biostatistics and Occupational Health, McGill University, Montreal, Canada
    • Christina Wolfson
    •  & Arnaud Chiolero
  5. Department of General Internal Medicine, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
    • Nicolas Rodondi
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DA and AC conducted the literature search and drafted the first version of the manuscript which was discussed with other authors. All authors revised the manuscript and contributed substantially to the final version. All authors read and approved the final manuscript.

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Correspondence to Daniela Anker.

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Anker, D., Santos-Eggimann, B., Santschi, V. et al. Screening and treatment of hypertension in older adults: less is more?. Public Health Rev 39, 26 (2018). https://doi.org/10.1186/s40985-018-0101-z

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Keywords

  • Screening
  • Hypertension
  • Older adults
  • Frailty

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