Abstract
Introduction
Cardiac organ damage like left ventricular (LV) hypertrophy and left atrial (LA) enlargement is more prevalent in women than men with hypertension, but the mechanisms underlying this gender difference remain unclear.
Methods
We tested the association of drug nonadherence with the presence of LV hypertrophy and LA enlargement by echocardiography in 186 women and 337 men with uncontrolled hypertension defined as daytime systolic blood pressure (BP) ≥ 135mmHg despite the prescription of at least two antihypertensive drugs. Drug adherence was assessed by measurements of serum drug concentrations interpreted by an experienced pharmacologist. Aldosterone-renin-ratio (ARR) was measured on actual medication.
Results
Women had a higher prevalence of LV hypertrophy (46% vs. 33%) and LA enlargement (79% vs 65%, both p < 0.05) than men, while drug nonadherence (8% vs. 9%, p > 0.514) did not differ. Women were older and had lower serum renin concentration and higher ARR than men, while 24-h systolic BP (141 ± 9 mmHg vs. 142 ± 9 mmHg), and the prevalences of obesity (43% vs. 50%) did not differ (all p > 0.10). In multivariable analyses, female gender was independently associated with a two-fold increased risk of LV hypertrophy (OR 2.01[95% CI 1.30–3.10], p = 0.002) and LA enlargement (OR 1.90 [95% CI 1.17–3.10], p = 0.010), while no association with drug nonadherence was found. Higher ARR was independently associated with LV hypertrophy in men only (OR 2.12 [95% CI 1.12–4.00] p = 0.02).
Conclusions
Among patients with uncontrolled hypertension, the higher prevalence of LV hypertrophy and LA enlargement in women was not explained by differences in drug nonadherence.
Registration
URL: https://www.clinicaltrials.gov; Unique identifier: NCT03209154.
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1 Introduction
Globally, hypertension is the most significant modifiable risk factor of cardiovascular (CV) morbidity and mortality in women and ranks second only to tobacco smoking in men [1]. Achieving blood pressure (BP) control is crucial for reducing the risk of cardiac organ damage, reflecting preclinical CV disease, in individuals with hypertension [1]. However, despite the availability of antihypertensive drugs, achieving BP control, particularly of the systolic BP, remains a challenge [2]. Studies indicate that fewer women reach the BP target, yet research on antihypertensive drug treatment effects specifically in women is limited [3, 4].
Recently, drug non-adherence has emerged as a major underlying cause of lack of BP control and is suggested to be particularly common among older women [1, 3, 5,6,7]. In a recent meta-analysis including 27 million patients with hypertension, the prevalence of nonadherence to antihypertensive medication varied between 27 and 40% among the included studies [8]. Assessing drug adherence is challenging, and while indirect methods like physicians’ interviews and pill count are criticized for their inaccuracy and complexity in clinical practice, serum drug concentration measurement is emerging as the preferred method [9].
Uncontrolled hypertension frequently leads to cardiac organ damage such as left ventricular (LV) hypertrophy and left atrial (LA) enlargement, which are strongly associated with subsequent clinical CV morbidity and mortality [1, 10]. Previous studies in essential hypertension have demonstrated that women have a higher prevalence of LV hypertrophy and LA enlargement than men when prognostically validated gender-specific threshold values for identification of cardiac organ damage are used [11,12,13]. Furthermore, women more often than men remain with residual LV hypertrophy despite adequate antihypertensive treatment [11], and are more prone to develop incident LV hypertrophy even during antihypertensive drug treatment [14]. These findings have been independent of concomitant metabolic disorders like obesity and diabetes mellitus, as well as impaired renal function, factors that may all contribute to a higher prevalence of cardiac organ damage [13,14,15]. However, these previous studies did not take gender differences in drug adherence into account. Granger et al. demonstrated that good drug adherence is associated with improved survival, even when treated with a placebo [16]. This suggests that adherent patients adopt a generally healthier lifestyle, that may potentially influence the prevalence of cardiac organ damage [16]. From this, we hypothesized that differences in drug adherence may contribute to a higher prevalence of cardiac organ damage in women with treated uncontrolled hypertension.
2 Methods
2.1 Study Population
Uncontrolled systolic BP is the most common type of uncontrolled hypertension and was used as basis for inclusion in our study [1]. The present study included 523 patients with confirmed uncontrolled hypertension (daytime systolic BP ≥ 135 mmHg) despite prescription of ≥ 2 antihypertensive drugs that participated in a national multicenter study performed at the four largest university hospitals in Norway in 2017–2022 [17]. To identify suitable participants, the primary study recruited a total of 1156 individuals aged ≥ 18 years with uncontrolled office systolic BP despite being prescribed ≥ 2 antihypertensive drugs and with a stable treatment regimen for at least 4 weeks (42% women). 24-hour (24-h) ambulatory BP recording at the baseline visit revealed that surprisingly many of the recruited patients (45%) had controlled daytime systolic BP (Fig. 1). The remaining 562 patients with uncontrolled daytime systolic BP between ≥ 135 mmHg and <170 mmHg (safety threshold), were invited to the follow-up visit which included echocardiography (Fig. 1). Of those, 548 showed up for echocardiography (Fig. 1). For the present analysis, 21 of these were excluded due to poor image quality precluding analysis, and 5 due to myocardial infarct scarring in the left ventricle (LV) (Fig. 1). Thus, 523 patients with uncontrolled treated hypertension are included in the present pre-specified sub-study (Fig. 1). Most patients (57%) were referred by primary care physicians, 15% were referred by secondary medical centers and 27% were self-referred through newspaper advertisements and public media discussion. A detailed description of the study inclusion and protocol has been previously published [17]. The study was approved by the Regional Ethical Committee (2017/804) and was conducted in accordance with the Helsinki Declaration.
2.2 Cardiovascular Risk Assessment
Attended office BP was measured in triplets in the seated position after 5 minutes of initial rest, using a validated device, and the office BP was taken as the average of the two last measurements [1]. Ambulatory 24-h BP was measured on the non-dominant arm using a validated device [1]. BP was measured every 20 min during daytime and every 30 minutes during nighttime. If < 70% of the BP measurements were technically successful, the ambulatory BP recording was repeated.
Self-reported medical history data was collected through a structured physician-patient interview. CV disease was defined as history of any of the following events: Myocardial infarction, angina pectoris, percutaneous coronary intervention, coronary bypass grafting, transient ischemic attack, or stroke.
The patient’s weight and height were measured. Obesity was defined as body mass index (BMI) ≥ 30 kg/m2. Albumin-creatinine ratio (ACR) was measured in morning spot urine. ACR ≥ 3 mg/mmol was considered elevated [18]. eGFR was calculated from serum creatinine using the Chronic Kidney Disease Epidemiology Collaboration equation [19].
The aldosterone-to-renin ratio (ARR) was calculated using aldosterone and direct renin concentration measurements, without adjusting for interfering antihypertensive medication. ARR > 35 pmol/mIU was considered a positive screening test for primary aldosteronism [20].
2.3 Drug Nonadherence
Serum drug concentrations were measured using ultra-high-performance liquid chromatography coupled with tandem mass spectrometry (UHLPC-MS/MS), and was available for the 23 most commonly prescribed antihypertensive drugs in Norway, as previously described [17, 21, 22]. An experienced pharmacologist interpreted the adherence status based on information about dosage, time since the last intake, and predefined serum reference ranges [17, 21, 22]. To minimize the influence on patient behaviour, no instructions regarding the administration of BP medication were given prior to the study visits, and patients were not informed about the serum drug measurement. Patients were defined as nonadherent if serum drug concentrations measured at the primary visit documented that at least one prescribed antihypertensive agent was undetectable or below the defined serum reference range [22].
2.4 Echocardiography
Transthoracic echocardiography was performed using a standardized imaging protocol at all study centers. Echocardiograms were digitally stored and transferred for analyses at the Echocardiography Core Laboratory at the University of Bergen, Norway, which uses Tomtec Arena Software (TomTec Imaging Systems GmbH, Unterschleissheim, Germany) and dedicated workstations. The images were initially analyzed by a junior investigator (AA) and proofread by a senior investigator (EG) in accordance with the current recommendations for echocardiographic core laboratory procedures [23, 24]. Cardiac organ damage was considered present if left ventricular (LV) hypertrophy and/or enlarged left atrium (LA) volume was found in the individual patient. LV hypertrophy was identified by gender-specific cut-off values for LV mass index (> 47.0 g/m2.7 in women and > 50.0 g/m2.7 in men).[1] LV hypertrophy was considered concentric if relative wall thickness (RWT) > 0.42, and eccentric if RWT ≤ 0.42 [1]. LA systolic volume was estimated by the biplane Simpsons’s method combining the apical four and two-chamber views [23]. The LA volume was indexed for height squared meter2 and defined as enlarged if ≥ 16.5ml/m2 in women and ≥ 18.5 ml/m2 in men [1]. The presence of mitral valve regurgitation was assessed by colour Doppler echocardiography and severity was graded as mild, moderate, or severe [25].
2.5 Statistical Analysis
Continuous variables are expressed as mean ± standard deviation and categorical variables are expressed as absolute numbers and percentages. Differences between women and men were tested by the student’s unpaired t-test, Mann-Whitney U test, and Pearson’s chi-square test as appropriate.
Covariables of LV hypertrophy and LA enlargement were identified in univariable and multivariable logistic regression analysis. All variables in Table 1 were evaluated in univariable analysis (p < 0.1). The enter method was used for the multivariable analysis, including covariables with significant univariable associations and clinical relevance while accounting for collinearity. A variance inflation factor > 1.4 was used to identify collinearity. When multiple variables represented similar aspects, we selected the variable with the strongest univariable association. Age and nonadherence were included in all multivariable models. Interaction analyses between gender and nonadherence in the models for LV hypertrophy/LA enlargement were performed by adding the product gender × drug nonadherence to the multivariable models. Logistic regression results are reported as odds ratio (OR), corresponding 95% confidence interval (CI), and p-value. A 2-sided p-value < 0.05 was considered statistically significant in all analyses.
The study had statistical power 0.80 with an alpha 0.05 to detect a 13% difference in the prevalence of LV hypertrophy between genders.
3 Results
3.1 Clinical Characteristics
Nonadherence to antihypertensive drugs was unexpectedly low in the study with no difference between women and men (8% vs. 9%, p = 0.51) (Table 1). The prevalence of obesity was high in both women and men (43% vs. 50%, p = 0.126) (Table 1). Women were older and had a longer duration of hypertension than men (Table 1). Women had lower direct renin concentration and higher ARR (Table 1). While women had higher office systolic BP, their 24-h systolic BP was similar to men’s, indicating a more pronounced white-coat effect in women (9.8 ± 14.4 mmHg) than in men (4.5 ± 14.4 mmHg, p < 0.001). On average, women and men were prescribed the same number of antihypertensive agents, but women were prescribed less calcium channel blockers (Table 1).
Compared to adherent patients, nonadherent patients were younger and had a shorter duration of hypertension (both p < 0.05) (Table 1). Furthermore, they had higher 24-h diastolic BP and a higher eGFR (both p < 0.05), while 24-h systolic BP, BMI, and prevalences of comorbidities were similar in the drug-adherent and nonadherent groups (Table 1).
3.2 Prevalence of Cardiac Organ Damage
LV hypertrophy was common in both genders, with a higher prevalence in women than men (46% vs. 33%, p = 0.004) (Table 1). Women had more concentric LV hypertrophy than men, whereas the prevalence of eccentric LV hypertrophy was comparable (Fig. 2). The majority of patients had LA enlargement with a higher prevalence in women (70% vs. 65%, p < 0.001) (Table 1). Furthermore, women had a higher prevalence of mitral valve regurgitation than men (Table 1). The prevalence of LV hypertrophy did not differ between adherent and non-adherent patients (Table 1).
3.3 Factors Associated with LV Hypertrophy
Drug nonadherence was not associated with LV hypertrophy in either gender (Table 2, Panel A). In the total study cohort, female gender was associated with a two-fold increased risk of LV hypertrophy (OR 2.01 [95% CI 1.30–3.10], p = 0.002) independent of significant associations with higher age, 24-h systolic BP, higher BMI and elevated ACR (Table 2, Panel A; Fig. 3). Interaction analysis showed no interaction between gender and drug nonadherence with the presence of LV hypertrophy. In gender-specific analyses, LV hypertrophy was only associated with higher BMI in women and with higher BMI, age, and 24-h systolic BP in men (Table 2, Panel A). Secondary models based on significant covariables identified separately in women and men yielded consistent results (Table S1). When adding elevated ARR to the primary model, elevated ARR was associated with presence of LV hypertrophy in men (OR 2.12 [95% CI 1.12–4.00], p = 0.02) but not in women (OR 1.48 [95% CI 0.67–3.28], p = 0.338) (Table S2).
3.4 Factors Associated with LA Enlargement
Drug nonadherence was not associated with higher prevalence of LA enlargement in either gender (Table 2, Panel B). Female gender was associated with an increased prevalence of LA enlargement (OR 1.90 [95% CI 1.17–3.10], p = 0.010) after adjusting for confounding factors (Table 2, Panel B; Fig. 3). Interaction analysis showed no interaction between gender and drug nonadherence with the presence of LA enlargement. In gender-specific analyses, LA enlargement was associated with higher BMI and LV hypertrophy in both genders, with mitral valve regurgitation in women, and with older age in men (Table 2, Panel B). Secondary models based on significant covariables identified separately in women and men yielded consistent results (Table S3). Adding elevated ARR to the primary models did not alter the results, and elevated ARR was not associated with LA enlargement in any group.
4 Discussion
Previous clinical studies in essential hypertension have repeatedly reported a higher prevalence of LV hypertrophy and LA enlargement in women compared to men when using gender-specific criteria [12, 13, 26]. Our study adds to these by demonstrating that the higher prevalence of LV hypertrophy and LA enlargement in women was not explained by differences in drug adherence among patients with uncontrolled hypertension despite being prescribed at least 2 antihypertensive drugs.
A recent national Canadian survey reported a concerning rise in uncontrolled treated hypertension in women [3]. Poor drug adherence was suggested as a potential cause, based on other reports demonstrating a higher prevalence of drug nonadherence in older women compared to men [2, 6]. Furthermore, gender differences in barriers to antihypertensive drug adherence have been reported in older individuals [5]. The low prevalence of drug nonadherence in our study was unexpected. A 20% prevalence of nonadherence was reported in a previous Norwegian study in apparent treatment-resistant hypertension, identified from daytime systolic BP, as also used in the present study [27]. However, nonadherence was indirectly assessed in the previous study [27]. A recent meta-analysis of hypertension studies reported a global prevalence of 27–40% [8]. Of note, lower prevalence was found in Western countries and when adherence was based on serum drug concentrations [8].
One possible explanation of the gender differences in cardiac organ damage in hypertension is the stronger impact of obesity and diabetes on LV remodeling in women compared to men [13, 28,29,30]. In a longitudinal study of 4290 patients with hypertension without LV hypertrophy at baseline, Izzo et al. demonstrated that both obese and lean women had a substantially higher incidence of LV hypertrophy during follow-up than obese men [14]. In the present study, obesity was equally prevalent and strongly associated with LV hypertrophy in both genders independent of confounders, and in fact the only significant covariable in adjusted analysis in women. Furthermore, presence of type 2 diabetes mellitus was correlated with LV hypertrophy exclusively in women. However, this correlation became nonsignificant when adjusting for BMI, in line with previous reports [31, 32]. Also, renal dysfunction is a recognized confounder of LV hypertrophy [33, 34]. Elevated ACR was more prevalent in men in our study and associated with LV hypertrophy independent of gender, in line with previous reports [34].
LA enlargement was the most common type of cardiac organ damage in both genders and was associated with higher BP and BMI. While higher 24-h systolic BP was associated with a higher prevalence of LA enlargement, drug nonadherence was not. In fact, drug nonadherence was associated with a lower prevalence of LA enlargement in the total population, possibly attributed to their younger age, shorter duration of hypertension, and lower renal function [12]. Interestingly, partly different confounders of LA enlargement were identified in women and men. As expected, more women had mitral regurgitation [12, 35], which was linked with LA enlargement. This adds to results from the Losartan Intervention for End-point Reduction in Hypertension study, which found mitral valve regurgitation a predictor of LA enlargement independent of gender [12]. However, that study did not report gender-specific results [12]. Furthermore, LA size was assessed by LA anterior-posterior diameter. Taken together, a stronger link between LA enlargement and mitral valve regurgitation in women than in men with hypertension is suggested [36].
Primary aldosteronism (PA) is a common and often overlooked cause of secondary hypertension [37]. In our study, standardized diagnostic testing for PA was not performed, but 28% of women and 23% of men had elevated screening ARR on actual medication, suggestive of underlying PA. PA has been linked to higher prevalence of LV hypertrophy in both genders [33]. Furthermore, emerging evidence suggests that even milder, renin-independent autonomous aldosterone secretion, below current diagnostic criteria for PA, may be associated with cardiac organ damage [38]. In the present study, elevated ARR was independently associated with LV hypertrophy only in men. The lack of association between elevated ARR and LV hypertrophy in women may reflect the known higher incidence of falsely elevated ARRs in women, especially when direct renin concentration measurement is used, as in the current study [39].
5 Study Limitations
Some study limitations should be noted. First, the cross-sectional study design prohibits the documentation of cause-effect relationships. Second, drug adherence was assessed at a single time point, and thus relates to short term adherence. Third, the Hawthorne effect may have resulted in an underestimation of nonadherence since some patients may have improved their drug adherence temporarily prior to the consultation [9]. Furthermore, selection bias may have occurred due to the voluntary nature of study participation, potentially favouring the recruitment of drug-adherent patients. The study also had an underrepresentation of women. Finally, measurements of aldosterone and renin were not standardized and may have been affected by actual medication. However, there is a growing consensus among PA experts that discontinuing antihypertensive drugs before the initial PA screening is not necessary [40, 41]. In our study, most patients were using angiotensin-converting enzyme inhibitors or angiotensin II receptor blockers, which may have led to a falsely low ARR, possibly resulting in an underestimation of the true prevalence of elevated ARR [39, 40].
6 Conclusion
This study provides novel evidence that the higher prevalence of LV hypertrophy and LA enlargement in women compared to men with uncontrolled treated hypertension was not explained by gender differences in drug nonadherence, assessed by serum drug concentrations. BMI was the only significant covariable of LV hypertrophy in women in adjusted analysis, underscoring the importance of weight control in the prevention of LV hypertrophy in women. Elevated ARR was common, pointing to the value of routine screening for PA in patients with uncontrolled systolic BP despite treatment with two or more antihypertensive drugs.
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Aune, A., Ohldieck, A., Halvorsen, L.V. et al. Gender Differences in Cardiac Organ Damage in Arterial Hypertension: Assessing the Role of Drug Nonadherence. High Blood Press Cardiovasc Prev 31, 157–166 (2024). https://doi.org/10.1007/s40292-024-00632-6
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DOI: https://doi.org/10.1007/s40292-024-00632-6