Hong Kong Med J 2020 Feb;26(1):27–34  |  Epub 22 Jan 2020
© Hong Kong Academy of Medicine. CC BY-NC-ND 4.0
 
ORIGINAL ARTICLE
Association between beta-blocker use and obesity in Hong Kong Chinese elders: a post-hoc analysis
KL Leung, BPharm, BSc1; Winnie Fong, BPharm1; Ben Freedman, MB, BS, PhD2; Beata Bajorek, PhD, BPharm3; Vivian WY Lee, PharmD, BCPS4
1 School of Pharmacy, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, Hong Kong
2 Heart Research Institute, Charles Perkins Centre, University of Sydney, Sydney, Australia
3 Graduate School of Health, University of Technology Sydney, Sydney, Australia
4 Centre for Learning Enhancement And Research, The Chinese University of Hong Kong, Shatin, Hong Kong
 
Corresponding author: Prof Vivian WY Lee (vivianlee@cuhk.edu.hk)
 
 Full paper in PDF
 
Abstract
Introduction: Studies of Caucasian populations have shown that beta-blockers may exacerbate weight gain, a risk factor for many chronic diseases. Still, beta-blockers are the most prescribed antihypertensives in the Chinese population in Hong Kong. We aimed to explore the association between beta-blocker use, hypertension, and weight status of this population.
 
Methods: A post-hoc analysis regarding body mass index (BMI) and the use of beta-blockers was performed based on the medication profile of community-dwelling older adults. Participants’ BMI, hypertension diagnosis, name, dose, frequency, route of administration of beta-blockers, and other drugs that may alter body weight were recorded.
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Results: Of 1053 Chinese individuals aged ≥65 years (mean age 76.9±7.2 years, 80% female) from 32 elderly centres in Hong Kong, 18% (185/1053) of them consumed beta-blockers. That group also had a significantly larger proportion of obese individuals (45.9% vs 32.1%, P=0.002). After adjusting for other weight-altering drugs, beta-blockers remained a significant predictor of overweight and obesity (P=0.001). As the hypertensive population had significantly higher BMI than the normotensive population (24.3±3.6 vs 22.9±3.5, P<0.001), a sub-analysis on those with hypertension diagnosis confirmed that only the hypertensive population taking atenolol had a significantly larger population of obese individuals (BMI ≥25) compared with those who took metoprolol (58.9% vs 38.5%, P=0.03) and those who did not take any beta-blockers (58.9% vs 38.4%, P=0.007).
 
Conclusions: Our findings taken together with other guideline reservations cast doubt on whether beta-blockers, particularly atenolol, should be the major drug prescribed to older adults with hypertension.
 
 
New knowledge added by this study
  • Beta-blocker consumption is associated with obesity in Chinese older adults.
  • Hypertensive population taking atenolol had the largest portion of obesity.
  • Strong and unique association of obesity and atenolol usage.
Implications for clinical practice or policy
  • Healthcare professionals should be more vigilant concerning initiation of therapy for hypertension and ongoing surveillance of weight, such as carefully assessing baseline characteristics (including both body mass index and blood pressure status) before prescribing a beta-blocker, and regular monitoring of both parameters in hypertension treatment, particularly for patients with obesity and those who have not yet become obese if beta-blockers are prescribed.
 
 
Introduction
Hypertension is highly prevalent and a key risk factor for cardiovascular disease.1 Less well recognised by patients and health professionals alike is that some of the pharmacotherapies used to treat hypertension may adversely impact other cardiovascular risk factors by causing weight gain. More specifically, the weight gain effects of beta-adrenergic antagonists (beta-blockers) have been highlighted by many studies of Caucasian patients.2 3 4 5 Many guidelines no longer list beta-blockers as first-line antihypertensives.6 7 8 However, the 2018 hypertension guidelines published by the European Society of Cardiology and the European Society of Hypertension,9 the joint statement published in 2012 by the European Society of Hypertension and the European Association for the Study of Obesity,10 and a position paper of The Obesity Society and the American Society of Hypertension11 still advocate the use of beta-blockers in patients with both hypertension and obesity because beta-blockade is more effective in lowering blood pressure (BP) in patients with obesity than in patients who are thinner.12 In Hong Kong, two recent large database studies found that beta-blockers are still the most commonly prescribed antihypertensives, although they are used relatively less in younger patients aged <55 years.13 14 Furthermore, only 4% of Hong Kong patients have their antihypertensive treatment upgraded by changing from beta-blockers to firstline agents.15
 
The generally increasing prevalence of obesity among older adults is an important factor in drug-induced weight gain.16 Studies have shown that obesity in older people is associated with functional impairment and co-morbidity, including hypertension, type 2 diabetes, coronary heart disease, heart failure, and dementia.17 18 19 These chronic conditions, for which being overweight is a risk factor, are also worryingly increasing in prevalence.20 21 22 This renders weight management in older persons an important health issue.
 
To date, there has been a lack of research to confirm the weight gain effects of beta-blockers in non-Caucasian populations, and this is particularly germane because so many older Chinese patients with hypertension are still receiving beta-blocker therapy.
 
The objective of this study was to explore the association between beta-blocker use, hypertension, and overweight/obesity in a cohort of older Chinese people. The specific objectives were to: (1) identify the proportion of patients prescribed beta-blockers; (2) compare the body mass index (BMI) of beta-blocker users with non-users; and (3) compare the effects of different beta-blockers on BMI.
 
Methods
Study design
A post-hoc analysis was undertaken using an existing dataset comprising the medication profiles of a cohort of community-dwelling older adults in Hong Kong. The data were originally collected (July to August in 2016) for a primary study seeking to explore the relationship between diet and the prevalence of atrial fibrillation.23 The study was approved by the Survey and Behavioural Research Ethics Committee of The Chinese University of Hong Kong and was conducted in accordance with the Declaration of Helsinki. Written informed consent was obtained from all study participants. Confidentiality agreement forms were signed by all data collectors. STROBE reporting guidelines were implemented in this manuscript.
 
Study population
The original study cohort comprised 1665 people attending one of 32 neighbourhood elderly recreational community centres in Hong Kong. The inclusion criteria included those who were Hong Kong Chinese residents, aged ≥65 years, living in the community, and able to speak and understand Cantonese. The exclusion criteria included those with terminal health conditions and/or significant cognitive impairment that would preclude participation because of communication barriers (eg, severe mental illness, dementia).
 
Data collection
All primary study data were collected during a summer community outreach programme—a territory-wide medical outreach service in Hong Kong provided by volunteer students from the Faculty of Medicine, The Chinese University of Hong Kong. The data were originally collected via face-to-face interviews with the participants in Cantonese and recorded on paper-based questionnaires by trained volunteer students.
 
At each outreach visit, participants’ body weight, height, and BP were measured, BMI calculated, medication profile extracted, and demographic data recorded. Calculated BMIs were compared with the Asian BMI classification set by the World Health Organization, in which BMI ≥23 and ≥25 are considered as overweight and obese, respectively.24 A self-reported diagnosis of hypertension and diabetes was recorded and verified against the patient’s current medication profile. The self-reported diagnosis of hypertension was the only evidence to determine whether the patient had hypertension or not. As part of the logistics and service provided by our outreach, BP was also measured using an Omron HEM-7011TM electronic blood pressure monitor (Omron Healthcare, Kyoto Japan), which has an “A/A” performance classification under British Hypertension Society criteria (ie, indicating that at least 80% and 95% of readings are within an absolute difference of 5 to 10 mm Hg from each other, respectively25). The readings were compared against 2017 American Heart Association guidelines,6 but such readings were not used to diagnose hypertension. To ensure accuracy, for each patient, the BP measurements were repeated after 10 minutes of rest when the first reading was found to be elevated (ie, BP >120/80 mm Hg). When a beta-blocker had been prescribed, the name, dose, frequency, and route of administration of the agent were additionally recorded. The consumption of other drugs known to alter body weight was also recorded and listed in Table 1.
 

Table 1. Participants' demographics and characteristics
 
Statistical analysis
Data handling (data entry, verification, and analysis) was computerised using SPSS (Windows version 23.0; IBM Corp, Armonk [NY], United States). Only the patients with complete drug profiles and all variables recorded were included. Any incomplete drug profile or missing variables (eg, BMI) were considered missing data and were not included in the analysis. Independent samples t tests were used to compare BMI values between people taking different beta-blockers. Binary logistic regression was used to verify the contributions of various drug classes and co-morbidities on a stratified binary BMI parameter (normal and underweight vs overweight and obesity). Chi squared tests were used to detect any significant differences in the proportion of patients with high BMI across different types of beta-blockers. A P value of <0.05 was considered statistically significant.
 
Results
Participant characteristics
Among the 1665 individuals participating in the summer community outreach programme, data pertaining to 1053 were included in the analysis after screening against the inclusion and exclusion criteria. The participants’ demographics and characteristics are shown in Table 1. People taking beta-blockers were generally heavier (mean BMI 24.6±3.7 vs 23.6±3.6, P<0.001). From the perspective of BP measurement readings, around 80% of the participants (804/1053) had elevated BP measurements during the outreach visit; of these, one third (286/804) had no history of hypertension and were not on any medications likely to be used for treating hypertension. The remaining two thirds (518/804) self-reported having hypertension. From the perspective of self-reported hypertension, 81.9% of those with self-reported hypertension (513/626) had hypertensive readings, and only 6% (40/626) had normotensive readings; the remaining ones had borderline hypertensive readings (12%, 73/626).
 
Overall, 185 (18%) of the 1053 participants were using one beta-blocker. Among the range of beta-blockers used, atenolol and metoprolol were the most frequently prescribed (40% and 53%, respectively), followed by propranolol (5%) and bisoprolol (2%). Among the beta-blocker users, the majority (95%, 175/185) had a self-reported history of hypertension. In those participants with self-reported hypertension who were not using beta-blockers (n=451), the main antihypertensive agents prescribed were calcium channel blockers (71.3%), angiotensin-converting enzyme inhibitors (22.3%), angiotensin receptor blockers (12.1%), alpha-blockers (7.9%), methyldopa (4.2%), hydralazine (1.0%), and reserpine (0.2%).
 
Body mass index and beta-blocker use
Overall, 54.1% (570/1053) of the participants were overweight or obese. The summary of patients’ BMI with or without beta-blockers is summarised in Table 2. After adjusting for consumption of various weight-altering drug classes, binary logistic regression showed that beta-blockers were the only drug class that made a significant contribution to stratified BMI status (ie, classification as overweight or obese) [Table 3]. Among those prescribed beta-blockers (n=185), a significantly higher proportion was either overweight or obese compared with those who were not taking beta-blockers (n=868) [64.8% vs 51.8%, P=0.002; Table 2]. This difference is most evident when comparing the proportion of patients with obesity across beta-blocker users and non-users (45.9% vs 32.1%, respectively; P=0.002).
 

Table 2. Body mass index distribution of people who were and were not using beta-blockers
 

Table 3. Binary logistic regression analysis on body mass index status
 
Participants deemed to have hypertension (based solely on self-reported diagnosis of hypertension plus verification against medication profile, but not on BP measurement during the outreach service) had a significantly higher BMI than those who were normotensive (mean BMIs: 24.3±3.6 vs 22.9±3.5, respectively; P<0.001). Although this difference may not be clinically significant, it triggered further sub-analysis on participants with hypertension diagnosis. A sub-analysis on the patients with self-reported diagnosis of hypertension was performed to confirm the association between the use of beta-blockers and BMI (Table 4). Among these participants with self-reported diagnosis of hypertension (n=626), a significantly higher proportion of patients with obesity (BMI >25) was observed in those using atenolol compared with those taking metoprolol (58.9% vs. 38.5%, P=0.031) or those who did not use any beta-blockers (58.9% vs 38.4%, P=0.007). Those using atenolol had a significantly higher BMI than those who did not use beta-blockers (mean BMIs: 25.3±3.5 vs 24.1±3.6, P=0.01).
 

Table 4. Body mass index distribution among older Chinese adults taking different beta-blockers
 
Binary logistic regression analysis found that loop diuretics were associated with BMI reduction. However, concerning mechanism and indication, loop diuretics function by enhancing salt and water excretion and are clinically used to maintain euvolaemia or prevent volume expansion.26 In other words, it makes no significant contribution to alteration of dry body weight, which is used for BMI determination and obesity evaluation. Therefore, despite the above findings, loop diuretics were excluded from our further analysis.
 
Discussion
Our study presents preliminary findings regarding the potential real-world impact of beta-blockers on weight, noting the high proportion of community-dwelling older adults using these agents. We found a significant association between obesity/overweight with the use of beta-blockers in older Chinese adults. The difference was largely driven by the strong association between obesity and atenolol (rather than other beta-blockers). This may have important ramifications on therapeutic choice if the association is causal.
 
The potential mechanisms by which beta-blockers may induce weight gain include reduction of total energy expenditure (by 5%-10%), which may involve (1) decreased resting energy expenditure; (2) increased feelings of tiredness, with subsequent reduction of non-exercise-associated thermogenesis; (3) inhibition of lipolysis; and (4) enhancement of insulin resistance.27
 
Many studies of Caucasian populations have reported the weight gain effects of beta-blockers, being associated with a mean weight gain of 1.2 kg (range, -0.4 kg to 3.5 kg),27 which could explain our findings of 2.6 kg higher mean body weight in people taking beta-blockers (mean body weight of people who did vs did not take beta-blockers: 57.8±9.7 kg vs 55.2±9.8 kg, respectively; P=0.002 respectively), but we do not have longitudinal data to make pre-versus post-drug commencement comparisons. Several studies have compared impact on weight between selected beta-blockers and alternative antihypertensive medications, ie, atenolol versus captopril,2 metoprolol versus thiazide diuretics,3 atenolol versus chlorthalidone,4 and atenolol versus nifedipine,5 with all reporting weight gain (or reduced weight loss) in the beta-blocker treatment group. A long-term follow-up study also reported sustained weight gain in a propranolol treatment group compared with a placebo group.28
 
Despite the findings of previous studies, to date, there have been no intraclass head-to-head studies in humans regarding beta-blocker-induced weight gain. The two beta-blockers of note, atenolol and metoprolol, both being β1-selective beta-blockers, seemingly have no plausible cause that could account for such differences between them. Our study suggests that atenolol and metoprolol (the two most commonly used beta-blockers in Hong Kong13 14) may have different effects on weight. We found a significantly higher BMI and a higher proportion of patients with obesity in those taking atenolol compared with those who did not, especially among those defined as being hypertensive. This difference in obesity was also significant for the comparison with metoprolol. Patients taking metoprolol did not show any significant difference from patients who were not on any beta-blockers.
 
In our study, the mean difference in BMI between those using atenolol and no beta-blockers was about 1.2. Converting the mean BMI difference in a 60-kg woman reveals a mean body weight difference of 3.1 kg. Whether such a degree of weight gain is clinically significant in light of age-related weight gain is worthwhile to discuss. Indeed, age-related weight gain is an important factor of concern. According to a study of older Chinese adults, the median weight change from 20 years old to baseline was 11.8 kg and 11.5 kg for men and women, respectively.29 Another 10-year follow-up study also reported that a modest weight gain (2.5-5 kg) was not associated with an increase in mortality.30 Therefore, a gain of 3.1 kg alone may not be clinically significant. Yet, such a modest weight gain can be additive to physiological age-related weight gain and contribute to obesity. While age-related weight gain may not be a modifiable factor, the selection of pharmacotherapy is definitely one. Particularly, the use of beta-blockers may not actually be the best therapeutic option for hypertension management. Switching to other first-line agents that have no weight gain effects would reduce the possibilities to become obese.
 
Given our findings, it is important to note the variable recommendations around the use of beta-blockers in hypertension management. Although a number of international guidelines advocate the use of beta-blockers in patients with both obesity and hypertension,9 10 11 the 2017 American Heart Association guideline criticised atenolol for its inferior efficacy in treatment of hypertension.6 Moreover, a meta-analysis of atenolol versus other antihypertensive treatments also reported higher overall and cardiovascular mortality and more frequent strokes with atenolol treatment.31 Given these reservations about atenolol and our findings of higher prevalence of obesity in those taking atenolol, it is uncertain whether atenolol should continue to be the most-used drug for hypertension. This is relevant to many parts of the world, including Hong Kong, where atenolol appears to be the first-line therapy for hypertension in older patients and may be associated with an adverse effect on weight and BMI.
 
To the best of our knowledge, this is the first study to evaluate the association between BMI and beta-blocker use in a Chinese population. Additionally, this is the first study highlighting the intraclass differences between beta-blockers in terms of possible weight gain effects (as illustrated by the proportion of obesity), specifically in the hypertensive Chinese population. Therefore, our findings have implications for local clinical practice given the high rate of use of beta-blockers, particularly atenolol, in the older adults in Hong Kong, despite guideline recommendations.
 
In considering this study’s findings, it is important to acknowledge some of its limitations. First, given the cross-sectional nature of the study, no temporal or causal relationships can be fully assessed or confirmed. We only found an association between beta-blocker usage and obesity in hypertensive patients. We did not assess weight gain, as the term weight gain has a temporal element that should be validated with duration of drug therapy and weight changes throughout a certain period. Second, there is an issue with ‘confounding by indication’: it is possible that some study patients were obese when their antihypertensive therapy was initiated and, consequently, their physicians elected to use beta-blockers, given the recommendation by the few international consensuses and guidelines.9-12 However, since this was a post-hoc analysis based on a cross-sectional study, it is difficult to figure out the temporal sequence—whether beta-blockers were initiated because the patients were obese, or the patients became obese after taking beta-blockers. Third, the results were subject to selection bias because (a) study participation was voluntary, likely representing those who were more physically and/or socially active, and (b) those who were home-bound or had limited access to outdoor environments were not available for inclusion. Third, although the selection criteria were not designed in favour of women, the greater participation of women in our study is common in community-based investigations in Hong Kong,32 33 34 35 36 37 probably reflecting their greater participation in community-based and health-related activities.32 33 Although the self-reported diagnoses of hypertension were verified against the medication profiles, it is possible that beta-blockers were prescribed for an alternative indication, such as ischaemic heart disease.
 
Conclusions
Our study has reported a high proportion of beta-blocker use among Hong Kong older adults with hypertension. Beta-blocker users, and more specifically atenolol users, have a significantly higher BMI, as well as a higher propensity towards obesity compared with non-users. Our results can remind clinicians of the possibility that beta-blockers, particularly atenolol, may worsen weight control in hypertensive patients with obesity or cause significant weight gain in those who are not yet obese. Our findings taken together with other guideline reservations cast doubt on whether beta-blockers, particularly atenolol, should be the major drug prescribed to older adults with hypertension.
 
Author contributions
All authors contributed to the concept of study, acquisition and analysis of data, wrote the article, and had critical revision for important intellectual content. All authors had full access to the data, contributed to the study, approved the final version for publication, and take responsibility for its accuracy and integrity.
 
Conflicts of interest
All authors have disclosed no conflicts of interest.
 
Funding/support
This research received no specific grant from any funding agency in the public, commercial, or not-for-profit sectors.
 
Ethics approval
The study was approved by the Survey and Behavioural Research Ethics Committee of The Chinese University of Hong Kong (Ref 14610518) and was conducted in accordance with the Declaration of Helsinki. Written informed consent was obtained from all study participants. Confidentiality agreement forms were signed by all data collectors.
 
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