Abstract
Essential hypertension is a complex clinical condition, characterized by multiple and concomitant abnormal activation of different regulatory and contra-regulatory pathophysiological mechanisms, leading to sustained increase of blood pressure (BP) levels. Asymptomatic rise of BP may, indeed, promote development and progression of hypertension-related organ damage, which in turn, increases the risk of major cardiovascular and cerebrovascular events. A progressive and independent relationship has been demonstrated between high BP levels and increased cardiovascular risk, even in the high-to-normal range. Conversely, evidence from randomized controlled clinical trials have independently shown that lowering BP to the recommended targets reduces individual cardiovascular risk, thus improving event-free survival and reducing the incidence of hypertension-related cardiovascular events. Despite these benefits, overall rates of BP control remain poor, worldwide. Currently available guidelines support a substantial equivalence amongst various antihypertensive drug classes. However, several studies have also reported clinically relevant differences among antihypertensive drugs, in terms of both BP lowering efficacy and tolerability/safety profile. These differences should be taken into account not only when adopting first-line antihypertensive therapy, but also when titrating or modulating combination therapies, with the aim of achieving effective and sustained BP control. This review will briefly describe evidence supporting the use of dihydropyridinic calcium channel blockers for the clinical management of hypertension, with a particular focus on barnidipine. Indeed, this drug has been demonstrated to be effective, safe and well tolerated in lowering BP levels and in reducing hypertension-related organ damage, thus showing a potential key role for improving the clinical management of hypertension.
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1 Introduction
Essential hypertension is the major modifiable cardiovascular (CV) risk factor associated with an increased risk of developing coronary artery disease, myocardial infarction, stroke, congestive heart failure, and CV death. Indeed, high blood pressure (BP) levels have been independently correlated with an increased susceptibility to metabolic abnormalities and renal impairment, ranging from microalbuminuria to end-stage renal disease. Increased CV risk related to hypertension is independent of age, gender, ethnicity, and the presence of concomitant CV risk factors or comorbidities. Conversely, lowering BP levels to the recommended targets (i.e. below 140/90 mmHg) has been demonstrated to provide beneficial effects in terms of a reduced incidence of CV outcomes and improved event-free survival rates.
Despite the availability of numerous effective and well-tolerated antihypertensive drug therapies, and beyond the implementation of favourable life-style changes, epidemiological and clinical studies have consistently and repeatedly shown poor rates of BP control in various European and Western countries [1,2,3], including Italy [4, 5]. More recently, systematic assessment of hypertension management and control have also reported relatively low rates of awareness, treatment, and control in Asia–Pacific countries, thus highlighting the epidemic proportion of the so-called “hypertension paradox”, which is characterized by the high prevalence and low control rate of the disease, worldwide [6].
Several strategies have been proposed by scientific societies for improving BP management and control, mostly through implementing international guideline recommendations for the proper selection of antihypertensive drug therapy according to individual global CV risk profile [7, 8]. Among possible pharmacological therapies currently available for the clinical management of hypertension, antihypertensive therapy based on the use of dihydropyridinic calcium channel blockers (CCB) has been demonstrated to be effective, safe and well tolerated in lowering BP levels and in reducing hypertension-related organ damage [9, 10].
In 2016 an educational program was performed in Italy with the aims of ameliorating the clinical management of hypertension and improving BP control rates by adopting rational, effective and well-tolerated antihypertensive drug therapies. This program, entitled THYPERevolution, was designed for different professional figures involved in the clinical management of hypertension. Following the analysis of the recently available clinical evidence discussed during these meetings, this review will briefly examine the potential role of antihypertensive therapy based on the use of CCBs for the clinical management of hypertension, with a particular focus on barnidipine.
2 Pharmacological Considerations on Calcium Channel Blockers
There are a number of important differences between therapeutic agents within the drug class of CCBs from a pharmacokinetic [11] and pharmacodynamic [12] point of view, and in their selectivity and duration of pharmacological action [13,14,15], which exist despite their ability to interact with L-type voltage-dependent transmembrane calcium channels. Unsurprisingly, the clinical and therapeutic effectiveness of CCBs in different clinical settings is affected as a result of these differences, along with their tolerability and safety profiles.
In order to distinguish different compounds within the drug class of CCBs, a number of classifications have been proposed. In one such classification, CCBs are separated into three groups based on their selectivity for interactions with either cardiac or vascular (or both) L-type voltage-dependent transmembrane calcium channels [16, 17]. This classification stratifies CCBs into three groups: (1) dihydropyridinic agents, which mostly act as dilating agents at the peripheral vessel level; (2) phenilalchilaminic agents, which predominantly act as negative inotropes and chronotropes at the cardiac level; and, (3) benzothiazepinic agents, which show an intermediate profile.
Nifedipine, verapamil, and diltiazem, respectively, were the first generation compounds of these three groups. However, their short acting therapeutic action has restricted their clinical effectiveness due to the possibility of drug-related adverse reactions (e.g. peripheral oedema, reflex tachycardia, and skin reactions). In more recent years, new slow-release formulations of “old” CCBs have been proposed and widely used in clinical practice, with a significant reduction of side effects observed with the same drugs when administered as short-acting formulation. Consequently, second and third generation CCBs were developed and have been used extensively for the treatment of hypertension and CV diseases. Amongst the group of dihydropyridinic agents, second and third generation CCBs including manidipine [18, 19], felodipine [20, 21], and nicardipine [22], and lacidipine [23], lercanidipine [24], barnidipine [25], and amlodipine [26], respectively, show improved selectivity for vascular calcium channels and more favourable pharmacokinetic and pharmacodynamic profiles compared with nifedipine.
Among these drugs, barnidipine, in a special preparation of a mixture of slow- and quick-releasing particles, is a long-acting dihydropyridinic CCB. The slow-releasing particles are coated with a membrane that can delay the release of barnidipine. With once-daily administration, barnidipine has shown potent antihypertensive action [27]. The modifìed-release, single-isomer formulation of barnidipine provides a slow onset of action combined with a sustained delivery of drug to effectively control BP throughout a 24-h period without causing hypotension or reflex tachycardia [27], and some additional benefits in reducing central blood pressure, possibly explaining the improvement in diastolic function [28]. Finally, its long duration of action, due to its lipophilicity, means that satisfactory BP control can be obtained with once-daily dosing [25].
3 Calcium-channel Blockers and Current Indications for Hypertension Treatment
Recognised evidence showing equivalence in terms of antihypertensive efficacy and in risk reduction of major CV events amongst the five antihypertensive drug classes (angiotensin converting enzyme (ACE) inhibitors, angiotensin receptor blockers (ARBs), beta-blockers, CCBs, and diuretics), provides physicians with a selection of therapeutic agents for the first-choice and maintenance antihypertensive treatment in monotherapy [29]. However, despite substantial equivalence in terms of antihypertensive effectiveness for these different antihypertensive drug classes, there are relevant differences regarding their indications and contraindications [29], which may limit their usefulness. In addition, several studies have demonstrated better tolerability profiles [30, 31] and more favourable metabolic properties [32,33,34] for drugs which inhibit the renin-angiotensin system (RAS) (i.e. ACE inhibitors or ARBs) and for CCBs compared with beta-blockers and diuretics.
CCB-based monotherapy offers an effective and safe means to control hypertension in patients with grade 1 hypertension, particularly for patients with compelling indications [29]. Current European guidelines recommend dihydropyridinic CCBs for lowering BP levels in black individuals, elderly subjects with isolated systolic hypertension, as well as in hypertensive patients with metabolic syndrome, cardiac (left ventricular hypertrophy) or vascular (atherosclerosis) organ damage, previous stroke or peripheral artery disease [29]. Indeed, for the treatment of hypertension and to reduce hypertension-related CV morbidity and mortality, dihydropyridinic CCBs are considered as one of the first-line therapeutic options [29]. Moreover, sustained antihypertensive efficacy and reduced CV and renal complications have been demonstrated for CCBs as monotherapy compared with other antihypertensive drug classes in several clinical settings, including high risk patients with hypertension, coronary artery disease, stroke, and renal failure [35,36,37,38,39,40,41].
It should also be noted that combination therapy based on a minimum of two drug classes may be needed to attain recommended BP targets for the vast majority of hypertensive patients [42]. For hypertensive patients with unsatisfactory BP control under monotherapy, or those with high or very high CV risk profiles, a combination of two antihypertensive classes, including CCBs, can be used.
4 Calcium-channel Blockers, Hypertension and High Cardiovascular Risk
The efficacy, safety and tolerability of CCB-based antihypertensive treatment has been assessed in hypertensive patients with high or very high CV risk in a number of international, randomized controlled clinical trials [35,36,37,38,39,40,41]. These trials have consistently confirmed the superior efficacy of CCBs in reducing both BP levels and the incidence of major CV events compared with either diuretics or beta-blockers, as well as equivalence to RAS blocking agents [35,36,37,38,39,40,41]. In addition, several randomized, controlled clinical trials have also assessed the efficacy, safety and tolerability of CCBs in adult hypertensive patients with additional risk factors [43,44,45,46].
The addition of low-dose felodipine to low-dose hydrochlorothiazide decreased systolic BP/diastolic BP on average by 4.2/2.1 mmHg compared with placebo in the Felodipine Event Reduction (FEVER) trial, which enrolled 9800 Chinese patients (aged 50–79 years) with hypertension plus one or two additional CV risk factors or disease [46]. Although this difference was small, it was associated with significant reductions in most CV events including a 27% reduction in the primary endpoint (fatal and non-fatal stroke) in the felodipine group (p = 0.001 versus placebo). Among secondary endpoints, significant reductions in all CV events (by 27%; p < 0.001), all cardiac events (by 35%; p = 0.012), death by any cause (by 31%; p = 0.006), coronary events (by 32%; p = 0.024), and CV death (by 33%; p = 0.019) were shown for felodipine versus the control group.
A chlorthalidone-based regimen was shown to lower BP levels more than CCBs or ACE inhibitors in the Antihypertensive and Lipid-Lowering Treatment to Prevent Heart Attack Trial (ALLHAT) [43]. In this double-blind, active-controlled, randomized clinical trial, 33,357 patients, aged 55 years or older, with a history of hypertension and at least one additional CV risk factor, were assigned to either chlorthalidone 12.5–25 mg/day, amlodipine 2.5–10 mg/day, or lisinopril 10–40 mg/day, and monitored for 4–8 years.
After 5-year follow-up, systolic BP was significantly higher in patients treated with amlodipine (+ 0.8 mmHg; p = 0.03) and lisinopril (+ 2 mmHg; p < 0.001) compared with chlorthalidone, whereas diastolic BP was significantly lower with amlodipine (− 0.8 mmHg; p < 0.001). Despite these differences in BP, there were no between treatment group differences for the incidence of the primary composite endpoint (combined fatal coronary heart disease or nonfatal myocardial infarction), or for all-cause mortality [43].
An amlodipine-based regimen reduced the incidence of CV events and diabetes when compared with an atenolol-based regimen in the Anglo-Scandinavian Cardiac Outcomes Trial-Blood Pressure Lowering Arm (ASCOT-BPLA) trial [44]. ASCOT-BPLA was a prospective, multicenter, randomized, clinical trial, which enrolled 19,257 patients with hypertension and at least three other CV risk factors. Patients were randomized to either an amlodipine-based regimen (amlodipine 5–10 mg plus perindopril 4–8 mg as required; n = 9639) or an atenolol-based regimen (atenolol 50–100 mg plus bendroflumethiazide 1.25–2.5 mg and potassium as required; n = 9618). Patients treated with the amlodipine-based regimen had lower BP values during the follow-up period than those allocated to the atenolol-based regimen. As the trial was stopped prematurely, the primary endpoint of non-fatal myocardial infarction and fatal coronary heart disease did not reach significance [hazard ratio (HR) 0.90, 95% confidence interval (CI) 0.79–1.02; p = 0.1052]. However, the amlodipine-based regimen significantly reduced the primary and secondary endpoints of all-cause mortality (by 11%; p = 0.0247), CV mortality (by 24%; p = 0.0010), total CV events and procedures (by 16%; p < 0.0001), total coronary endpoints (by 13%; p = 0.0070), and fatal and non-fatal stroke (by 23%; p = 0.003), compared with the atenolol-based regimen [44].
Benazepril plus amlodipine showed superior efficacy to benazepril plus hydrochlorothiazide in reducing CV events in 11,506 patients with hypertension at high CV risk in the Avoiding CV Events through Combination Therapy in Patients Living with Systolic Hypertension (ACCOMPLISH) trial [45]. In this trial, which was terminated early after exceeding the limit of the pre-specified stopping rule (mean follow-up of 36 months), combination therapy with benazepril plus amlodipine significantly reduced the incidence of both primary (HR 0.80, 95% CI 0.72–0.90; p < 0.001) and secondary (HR 0.79, 95% CI 0.67–0.92; p = 0.002) endpoints compared with combination therapy with benazepril plus hydrochlorothiazide [45].
5 Clinical Efficacy and Tolerability of Barnidipine
The antihypertensive efficacy, safety and tolerability profile of barnidipine has been evaluated in numerous clinical studies involving hypertensive patients with different CV risk profiles [47].
Similar antihypertensive efficacy of barnidipine 10 mg and amlodipine 5–10 mg once daily was demonstrated in a 24-week, randomized, open-label, pilot study, which included 30 untreated patients (mean age 47 years) with grade 1–2 essential hypertension, as defined by an office sitting systolic BP of 140–179 mmHg and diastolic BP of 90–109 mmHg [48]. Although the sample size was small, no significant differences in mean BP reductions were identified at study end for the barnidipine versus amlodipine treatment groups (office BP − 10.3/− 9.4 versus − 16.6/− 9.1 mmHg; ambulatory BP 9.4/6.4 versus 8.1/5.1 mmHg) [48]. It should be noted, however, that the dose of amlodipine was doubled to 10 mg in 6 patients due to inadequate BP control after 12 weeks’ treatment, whereas drug dosage remained constant in the barnidipine group [48]. In addition, drug-related adverse events (including ankle oedema, headache, and palpitations) were significantly higher in the amlodipine group compared with barnidipine (60 versus 13%; p < 0.05) [48].
The BP-lowering effect of barnidipine 10–20 mg in combination with losartan 50 mg showed no significant differences when compared with losartan 100 mg as monotherapy in 53 patients with grade 1–2 essential hypertension and uncontrolled BP following a 1-week run-in period under losartan 50 mg monotherapy [49]. However, a significantly higher percentage of responders for systolic BP was demonstrated with barnidipine plus losartan compared with losartan monotherapy (82.1 versus 56.0%; p = 0.044), and barnidipine plus losartan provided better and sustained antihypertensive efficacy over 24 h, mostly during the last hours of the night-time period (Fig. 1) [49]. In this 12-week, multicenter, randomized, open-label, parallel-group study, the dosage of barnidipine was doubled to 20 mg in patients with uncontrolled BP on combination therapy after 6 weeks of treatment, and patients were treated for a further 6 weeks, whereas patients on losartan 100 mg who did not achieve BP control at 6 weeks were discontinued. The primary endpoint was the change in daytime diastolic BP between baseline and 12 weeks’ treatment; tolerability, safety and adherence to prescribed medications were also assessed. In total, 18 patients with uncontrolled BP after 6 weeks’ treatment with barnidipine plus losartan (64.3%) had their dose of barnidipine doubled to 20 mg, and 8 patients in the losartan group (32.0%) were discontinued. In general, both treatments were well tolerated and safe, with no significant differences between treatment groups [49].
The BArnidipine real-life Safety and tolerability In Chronic HyperTension (BASIC-HT) study, a large observational study which included a population sample of 20,479 adult outpatients with essential hypertension, assessed the effectiveness and tolerability of barnidipine in a setting of real-life practice in Belgium and Luxembourg [50]. Efficacy, safety and tolerability of antihypertensive therapies were assessed at two visits during a 3-month follow-up. This study showed that 40% of the patients received barnidipine as first-line therapy and a further 40% were administered barnidipine in combination with other antihypertensive drugs [50]. Notably, barnidipine, as monotherapy (12%) or in combination with other antihypertensive drugs (9%), replaced another antihypertensive therapy in 20% of the patients [50]. For patients previously treated with other CCBs, mostly including amlodipine or lercanidipine, the reason for switching to barnidipine-based therapy was mainly due to safety (42%), lack of efficacy (28%), or both (11%). Reductions of systolic and diastolic BP levels during the observational period are reported in Fig. 2 [50]. Overall, the antihypertensive therapies were generally well tolerated and adverse events were reported for approximately 10% of patients, with a total drop-out rate of 8% after the 3-month follow-up period [50].
A subsequent analysis of the BASIC-HT database, which evaluated the efficacy and tolerability of barnidipine in a subgroup of patients for whom treatment with barnidipine replaced amlodipine or lercanidipine, suggested that replacement with barnidipine was a valuable therapeutic option, particularly when tolerability with other CCBs was an issue [51]. In total, 1710 patients with mild to moderate hypertension switched treatment from amlodipine or lercanidipine to barnidipine, either as monotherapy (approximately 51% of patients) or in combination with other antihypertensive drug classes (approximately 48% of patients) [51]. The decrease in systolic and diastolic BP levels during the observational period are reported in Fig. 3 [51]. The primary cause for switching treatment to barnidipine was related to at least one tolerability reason (peripheral oedema and headache) [51]. The main reason for switching treatment was tolerability. Indeed, 65.4% (1094/1674) of patients previously treated with amlodipine or lercanidipine switched to barnidipine for at least one tolerability reason (tolerability alone or tolerability and other reason). Effectiveness was given as the reason for 41.6% (697/1674) of patients who switched to barnidipine (effectiveness alone or effectiveness and other reason) [51].
The occurrence of drug-related adverse events in switcher patients was relatively low (around 10%) during the subsequent 3-month follow-up, and similar in frequency to the overall switcher population in BASIC-HT [50]. This analysis showed that that 37.1% (571/1539; 95% CI 34.7%; 39.6%) of the switchers achieved normalization of both SBP and DBP at the end of the 3-month follow-up period versus 9.4% [144/1539; 95% CI 8.0%; 10.9%] at inclusion (p < 0.0001) [51].
6 Barnidipine and Organ Protection
A number of clinical studies have also demonstrated the beneficial effects of barnidipine in terms of protection from hypertension-related organ damage.
Favourable effects on markers of cardiac organ damage were demonstrated in a randomized, open-label, pilot study of 30 untreated patients with grade 1–2 essential hypertension who were treated with either barnidipine 10 mg or amlodipine 5–10 mg once daily [48]. In this study, both barnidipine and amlodipine provided similar reductions of left ventricular mass, without significant differences between the two treatment arms. However, only barnidipine provided significant reduction of left ventricular mass compared with baseline values (p < 0.05), which were also higher in barnidipina group compared to amlodipine group (Fig. 4) [48]. In addition, significantly more patients in the amlodipine group reported drug-related adverse events compared with those in the barnidipine group [9 (60%) versus 2 (13%); p < 0.05] [48].
Improvement in left ventricular diastolic relaxation, as assessed by tissue Doppler imaging (TDI) echocardiography, was shown following 12 weeks’ treatment with barnidipine monotherapy 10–20 mg once daily in 30 patients with grade 1–2 hypertension and metabolic syndrome who also underwent lifestyle changes [52]. At study end, mean office BP was < 140/90 mmHg in 20 patients (66.7%), with significant reductions in mean systolic and diastolic BP from baseline (both p = 0.001); significant reductions were also shown in 24-h ambulatory systolic and diastolic BP levels (both p = 0.001 versus baseline). In addition, there was a significant decrease in fasting plasma glucose concentration at study end versus baseline (104 versus 110 mg/dL; p = 0.001), without relevant changes in lipid profiles [52]. No significant changes in left ventricular structure or systolic function were recorded, while the peak E/A velocity ratio on TDI was significantly increased from 1.078 at baseline to 1.245 at study end (p = 0.009) [52]. No significant adverse events or drug-related reactions were observed during the observational period.
Greater improvement of echocardiographic parameters were shown for barnidipine plus losartan compared with lercanidipine plus losartan in a relatively small sample of hypertensive patients (n = 144) with diabetes and left ventricular hypertrophy [53]. In addition to losartan 100 mg/day, patients were randomized to receive either lercanidipine 20 mg/day or barnidipine 20 mg/day for 6 months. Both drug regimens reduced clinic BP levels at the end of the follow-up period, with no significant differences between treatment groups. However, a significant reduction in left ventricular mass index was identified in patients who received barnidipine plus losartan compared with lercanidipine plus losartan (p < 0.05). Treatment with barnidipine plus losartan also increased the ratio of peak early diastolic filling velocity to peak filling velocity at atrial contraction (p < 0.01 versus baseline), but this was not increased by lercanidipine plus losartan, thus ameliorating diastolic function in these patients. In addition, isovolumetric relaxation and time and left atrial volume index were reduced in patients treated with barnidipine plus losartan, but not with lercanidipine plus losartan [53].
Treatment with barnidipine plus losartan improved parameters indicative of endothelial damage and oxidative stress in 151 patients with mild to moderate hypertension and type 2 diabetes mellitus randomized to receive either barnidipine 20 mg/day, or lercanidipine 20 mg/day, in addition to losartan 100 mg/day, for 6 months [54]. Significant reductions in clinic and 24-h ambulatory BP were shown for both treatment groups at study end (p < 0.001 for barnidipine plus losartan and p < 0.01 for lercanidipine plus losartan, versus baseline), however, BP reduction was greater in patients treated with barnidipine plus losartan than those treated with lercanidipine plus losartan (p < 0.05) [54]. Levels of high-sensitivity C-reactive protein, tumor necrosis factor-alpha, soluble vascular adhesion protein-1, soluble intercellular adhesion protein-1, and isoprostanes were significantly reduced with barnidipine plus losartan the compared with both baseline and with lercanidipine plus losartan (all p < 0.05) [54].
Similar findings were also observed by Muiesan and coworkers, who suggested that barnidipine may have a favourable effect on endothelial dysfunction in patients with mild to moderate hypertension [55]. This study investigated the effect of barnidipine on endothelial function compared with hydrochlorothiazide, based on assessment by flow-mediated vasodilation of the brachial artery, in a cohort of 40 adult hypertensive outpatients. Clinic BP was significantly reduced in both treatment groups after 12 and 24 weeks of treatment, however, a significant reduction in 24-h systolic and diastolic BP was only observed in patients treated with barnidipine [55]. In addition, the percentage change of flow-mediated vasodilation was significantly improved at both 12 and 24 weeks in patients treated with barnidipine, but not in those treated with hydrochlorothiazide [55].
7 Conclusion
Treating hypertension still represents a difficult clinical task, due to the complexity of the disease and the frequent concomitant presence of associated CV risk factors and comorbidities, which render BP difficult to manage in hypertensive patients. Despite a reported substantial equivalence among antihypertensive drug classes, both in terms of antihypertensive efficacy and of CV protection, there are several differences that may have at least, in part, clinical relevance, such as sustained BP lowering effectiveness, tolerability, and protection from hypertension-related organ damage. CCBs have been demonstrated to be safe, effective and well-tolerated antihypertensive drugs in various clinical settings, including high-risk hypertensive patients, coronary artery disease, stroke, renal disease, and congestive heart failure. Among these drugs, barnidipine may represent an ideal option both as first line therapy and as combination therapy for antihypertensive strategies aimed at achieving the recommended BP targets, and providing protection from hypertension-related organ damage.
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Tocci, G., Desideri, G., Roca, E. et al. How to Improve Effectiveness and Adherence to Antihypertensive Drug Therapy: Central Role of Dihydropyridinic Calcium Channel Blockers in Hypertension. High Blood Press Cardiovasc Prev 25, 25–34 (2018). https://doi.org/10.1007/s40292-017-0242-z
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DOI: https://doi.org/10.1007/s40292-017-0242-z