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Differential effects of glucagon-like peptide-1 receptor agonists on heart rate

Cardiovascular Diabetology volume 16, Article number: 6 (2017) Cite this article

Abstract

While glucagon-like peptide-1 receptor agonists (GLP-1 RAs) are known to increase heart rate (HR), it is insufficiently recognized that the extent varies greatly between the various agonists and is affected by the assessment methods employed. Here we review published data from 24-h time-averaged HR monitoring in healthy individuals and subjects with type 2 diabetes mellitus (T2DM) treated with either short-acting GLP-1 RAs, lixisenatide or exenatide, or long-acting GLP-1 RAs, exenatide LAR, liraglutide, albiglutide, or dulaglutide (N = 1112; active-treatment arms). HR effects observed in two independent head-to-head trials of lixisenatide and liraglutide (N = 202; active-treatment arms) are also reviewed. Short-acting GLP-1 RAs, exenatide and lixisenatide, are associated with a transient (1–12 h) mean placebo- and baseline-adjusted 24-h HR increase of 1–3 beats per minute (bpm). Conversely, long-acting GLP-1 RAs are associated with more pronounced increases in mean 24-h HR; the highest seen with liraglutide and albiglutide at 6–10 bpm compared with dulaglutide and exenatide LAR at 3–4 bpm. For both liraglutide and dulaglutide, HR increases were recorded during both the day and at night. In two head-to-head comparisons, a small, transient mean increase in HR from baseline was observed with lixisenatide; liraglutide induced a substantially greater increase that remained significantly elevated over 24 h. The underlying mechanism for increased HR remains to be elucidated; however, it could be related to a direct effect at the sinus node and/or stimulation of the sympathetic nervous system, with this effect related to the duration of action of the respective GLP-1 RAs. In conclusion, this review indicates that the effects on HR differ within the class of GLP-1 RAs: short-acting GLP-1 RAs are associated with a modest and transient HR increase before returning to baseline levels, while some long-acting GLP-1 RAs are associated with a more pronounced and sustained increase during the day and night. Findings from recently completed trials indicate that a GLP-1 RA-induced increase in HR, regardless of magnitude, does not present an increased cardiovascular risk for subjects with T2DM, although a pronounced increase in HR may be associated with adverse clinical outcomes in those with advanced heart failure.

Background

The injectable glucagon-like peptide-1 receptor agonists (GLP-1 RAs) are widely used in the management of type 2 diabetes mellitus (T2DM) [1]. These agents preferentially lower fasting and postprandial hyperglycemia according to their pharmacokinetic (PK) characteristics, while also being associated with body weight loss [1,2,3,4,5,6]. GLP-1 RAs exhibit a broad range of effects on the cardiovascular system that are independent of changes in blood glucose. The majority of these are cardio-protective, including lowering systolic and diastolic blood pressure [5, 6] and attenuating hypotension induced by intraduodenal glucose infusion [7], lowering plasma cholesterol level [5, 8] and ischemia–reperfusion injury [9], and delaying the progression of atherosclerotic disease [9]. GLP-1 RAs have also been suggested to be nephroprotective [10], even though conflicting data on renal sodium and water handling have been reported [10,11,12].

GLP-1 RAs induce an increase in heart rate (HR), which, theoretically, represents a safety concern, as this is considered to be associated with higher cardiovascular risk [13, 14]. Initially it was believed that this positive chronotropic effect was not clinically relevant and was of a similar magnitude for all GLP-1 RAs. A meta-analysis of Phase 3 trials reported HR increases in the range of 1–4 beats per minute (bpm) for exenatide twice daily (BID), exenatide long-acting release (LAR), and liraglutide [15]. In these studies, HR was assessed by pulse rate measurements at a single time point. In order to allow a more sensitive differentiation of GLP-1 RA-dependent HR effects, the current manuscript presents HR data derived from ECG measurements and ambulatory blood pressure monitoring at multiple time points over 24 h.

Six injectable GLP-1 RAs are currently approved for the treatment of T2DM in Europe and in the USA. Exenatide is a synthetic version of exendin-4, a potent GLP-1 RA isolated from the venom of the Gila monster, and approved for BID administration, with exenatide LAR being a microsphere formulation of exendin-4 that enables once weekly (QW) administration [3]. Lixisenatide is structurally related to exendin-4 (six lysine residues have been added to the C terminus, and one proline in the C-terminal region has been deleted) but can be administered once daily (QD). Liraglutide is in close structural homology to native GLP-1 and is conjugated to a palmitic acid to prolong its half-life for QD administration [3]. Albiglutide comprises two copies of GLP-1 fused as tandem repeats to the N terminus of albumin [3], while dulaglutide is a recombinant fusion protein consisting of two GLP-1 peptides covalently linked to a human IgG4-Fc heavy-chain variant [3]. These formulations prolong the PK profile of both of these preparations to allow QW administration [3]. According to their respective PK profiles, exenatide BID and lixisenatide can be categorized as short-acting agents (each has a half-life of 3–5 h) compared with the long-acting agents liraglutide, exenatide LAR, albiglutide, and dulaglutide, which have half-lives ranging from 12 h to several days [16].

Based on the different molecular structures and PK characteristics of the GLP-1 RAs and the presence of GLP-1 receptors on the sinoatrial node, differential effects on HR may be expected. Therefore, the aim of this review of published data is to compare the magnitude and duration of the effects on HR induced by various GLP-1 RAs, both in healthy individuals and in those with T2DM, utilizing individual 24-h HR measurements from clinical trials, including head-to-head comparison data.

Data search

PubMed searches were performed using relevant terms, including ‘GLP-1’, ‘GLP-1 receptor agonists’, ‘Exenatide BID’, ‘Lixisenatide’, ‘Liraglutide’, ‘Albiglutide’, ‘Dulaglutide’, ‘Exenatide LAR’, ‘heart rate’, and ‘pulse rate’. Priority for inclusion in this manuscript was awarded to studies that measured HR over a full 24-h period by serial ECG monitoring or those using ambulatory blood pressure measurements including serial or continuous HR detection. Two trials fulfilling these criteria directly compared the short-acting GLP-1 RA lixisenatide with the long-acting GLP-1 RA liraglutide [17, 18]. Moreover, relevant data from product monographs were also reviewed.

Effects of short-acting GLP-1 RAs on HR

Exenatide BID

In a QT study using serial ECG monitoring, exenatide 10 µg QD was found to result in a transient HR increase of 10 bpm in 62 healthy individuals 2 h after a single injection. The effect faded over time, with HR returning to baseline levels after approximately 10 h (Fig. 1a) [19, 20]. The peak HR increase mirrored the PK profile, which shows that the maximum plasma concentration of exenatide is reached 2 h after injection [20]. In a second study in 28 patients with T2DM, the mean 24-h HR was assessed after 12 weeks’ treatment with exenatide 10 µg BID (5 µg BID initiation dose for 4 weeks followed by 10 µg BID). HR averaged over 24 h increased by 2 bpm with exenatide BID compared with a decrease of 1 bpm for placebo (n = 26) at the end of the study period [21].

Fig. 1
figure 1

Changes from baseline in the placebo-adjusted mean HR as a function of time for a exenatide 10 µg [20] and b lixisenatide 20 µg QD (Sanofi, data on file). bpm beats per minute, CI confidence interval, HR heart rate, QD once daily. a Reproduced with permission from AstraZeneca

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Lixisenatide

In a QT study, HR data from serial ECG measurements in healthy individuals receiving lixisenatide 20 µg QD for 28 days (N = 68; patients with evaluable data n = 61; dose titration: 10 and 15 µg during weeks 1 and 2, respectively; 20 µg during weeks 3 and 4) demonstrated a maximum HR increase of 7.3 bpm 4 h post-dosing [22]. As shown in Fig. 1b, the changes in HR were transient and reverted to baseline after 12 h (Sanofi, data on file; data available on request). The mean 24-h HR increase adjusted for baseline and placebo values was 1.3 bpm [22].

Effect of long-acting liraglutide QD on HR

A 24-h time-averaged increase in mean placebo- and baseline-adjusted HR of 7–8 bpm was reported following liraglutide 1.2 and 1.8 mg QD (titrated in 0.6-mg weekly steps) using serial ECG monitoring at the end of the second and third weeks (after the seventh and final dose) of liraglutide (N = 51). Notably, the elevation in HR persisted through the 24-h measurement period for both doses, and was characterized by an initial increase followed by a decline and then a second more persistent increase (Fig. 2a) [23].

Fig. 2
figure 2

a Changes from baseline in the placebo-adjusted mean HR as a function of time for liraglutide 1.2 and 1.8 mg QD [23]. b 24-h HR profiles for liraglutide 1.8 and 3.0 mg, and placebo QD [24]. bpm beats per minute, CI confidence interval, HR heart rate, QD once daily. Reproduced with permission from Novo Nordisk and the FDA

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In a second study [24, 25], the effect of liraglutide on HR was investigated by 24-h continuous HR monitoring in obese individuals (3 mg n = 32; 1.8 mg n = 30) without diabetes following 5 weeks’ treatment (titrated from 0.6 mg subcutaneously and increased in increments of 0.6 mg per week, up to end doses of 1.8 and 3.0 mg). HR increased during the day and at nighttime with both doses compared with placebo (Fig. 2b), with the overall 24-h HR increased by 6–7 bpm. The 3.0-mg dose (approved for treatment in obese subjects) was associated with a further 1-bpm HR increase over 24 h compared with the 1.8-mg dose. The HR increases with both liraglutide doses were more pronounced during nighttime (7.0–8.9 bpm) compared with those seen during the day (4.3–4.6 bpm).

Similar results were obtained in a third placebo-controlled study of liraglutide 1.8 mg, which also employed 24-h ambulatory HR monitoring in overweight or obese hypertensive subjects with T2DM (n = 17). At 3 weeks’ follow-up, HR with liraglutide was significantly elevated compared with placebo (n = 17) for the whole 24-h period, day- and nighttime (least squares mean differences were 5.2, 4.6, and 7.3 bpm, respectively) [26].

Comparison of short- vs. long-acting GLP-1 RAs on HR: lixisenatide vs. liraglutide

The effects on HR for the short-acting RA lixisenatide vs. the long-acting GLP-1 agent liraglutide were analyzed in two independent head-to-head comparison studies [17, 18]. In the first trial, lixisenatide 20 µg QD (n = 46) and liraglutide 1.2 (n = 44) and 1.8 mg QD (n = 46) were compared following 8 weeks’ treatment in 142 subjects with T2DM not adequately controlled with insulin glargine with or without metformin [17]. Both GLP-1 RAs were administered in the morning and the approved titration schemes were applied. 24-h HR was assessed using standard ambulatory blood pressure monitoring at baseline and after 8 weeks (Fig. 3).

Fig. 3
figure 3

Changes from baseline in 24-h mean HR, as assessed by ambulatory blood pressure monitoring, for lixisenatide vs. liraglutide. bpm beats per minute, HR heart rate. Reproduced from Meier et al. [17]. [American Diabetes Association, 2015. Copyright and all rights reserved. Material from this publication has been used with the permission of American Diabetes Association.]

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Mean (standard error [SE]) increases in 24-h HR from baseline were 3.3 (1.3) bpm for lixisenatide 20 µg vs. 9.3 (1.2) and 9.2 (1.3) bpm for liraglutide 1.2 and 1.8 mg, respectively (mean differences vs. lixisenatide were 6.0 and 5.8 bpm for liraglutide 1.2 and 1.8 mg, respectively; p < 0.0001) [17]. Further analysis (Sanofi, data on file; data available on request) revealed a 4-bpm increase for lixisenatide vs. an approximate 9-bpm increase for both liraglutide 1.2 and 1.8 mg during the daytime. At nighttime, lixisenatide increased HR by 2.2 bpm compared with approximately 10 bpm for both liraglutide doses (Table 1). None of the HR increases correlated with a decrease in either systolic or diastolic blood pressure (Fig. 4).

Table 1 Daytime and nighttime HR changes (bpm)
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Fig. 4
figure 4

Relationship between the effect of lixisenatide on HR and a systolic blood pressure and b diastolic blood pressure. Baseline is defined as the 24-h profile on week –1 (day –2/–1) determined as overall mean. bpm, beats per minute, HR heart rate

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A second head-to-head comparison trial between lixisenatide and liraglutide was performed in 60 subjects with T2DM [18]. In this study, a 24-h Holter ECG recording was performed at baseline, after the maximum daily dose for each drug (lixisenatide 20 µg, liraglutide 0.9 mg) had been administered for at least 1 week following completion of the up-titration period. In the lixisenatide-treated group, a significant increase in HR was observed only at 5 h post-dosing, and the mean HR per day remained unchanged (69.1 ± 8.6 to 71.7 ± 10.6 bpm; p = 0.172; Fig. 5). In contrast, in the liraglutide-treated group, the mean daily HR increased significantly from baseline at all times (66.5 ± 10.2 to 79.7 ± 10.5 bpm; p = 0.00021; Fig. 5).

Fig. 5
figure 5

Diurnal profile of HR changes in subjects with T2DM at baseline and after treatment with liraglutide or lixisenatide [18]. Data are mean (SD). ‡p ≤ 0.05; †p ≤ 0.01; *p ≤ 0.001 vs. baseline. bpm beats per minute, HR heart rate, SD standard deviation, T2DM type 2 diabetes mellitus. Reproduced from Nakatani et al. [18]. [American Diabetes Association, 2016. Copyright and all rights reserved. Material from this publication has been used with the permission of American Diabetes Association.]

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Effects on HR of the long-acting QW GLP-1 RAs: exenatide LAR, albiglutide and dulaglutide

Exenatide LAR

A thorough QT study evaluated the effects of steady-state therapeutic (253 and 399 pg/ml) and supra-therapeutic (627 pg/ml) plasma concentrations of exenatide following continuous intravenous infusion of exenatide LAR to healthy individuals (N = 86; patients with evaluable data, n = 74) over three 24-h periods, each separated by a washout period of at least 5 days [27]. HR was monitored continuously throughout each infusion period. At these two concentrations of exenatide, the mean HR increased by up to 16.8 bpm compared with an increase of 5.5 bpm with placebo. In a second QT study, the effect of a QW injection of exenatide LAR on HR in 148 subjects with T2DM was evaluated after 14 and 30 weeks’ treatment [28]. In this study, a mean increase in 24-h HR of 3.6 and 3.5 bpm was observed at weeks 14 and 30, respectively.

Albiglutide

The effect of albiglutide QW on HR was investigated in a study involving ECG measurements in 85 healthy individuals after 6 weeks’ treatment (albiglutide was administered at a dose of 30 mg [initiation dose] for 2 weeks followed by 50 mg [optional dose based on individual glycemic response] for 4 weeks) [29]. The placebo-corrected increase in mean HR from baseline at the end of the study (day 39) was up to 3 and 6–8 bpm for the 30- and 50-mg dose, respectively.

Dulaglutide

The HR effects of dulaglutide 0.75 mg and 1.5 mg were investigated using ambulatory blood pressure and HR measurements in 505 subjects with T2DM following 26 weeks’ treatment [30]. Dulaglutide 0.75 mg (n = 251) resulted in a mean increase in 24-h HR of 1.3 bpm, whereas a 3.5-bpm increase in HR was observed at the end of the study for the 1.5-mg dose (n = 254). When comparing effects during the daytime and at nighttime after 26 weeks’ treatment, the HR increase compared with placebo was only significant during the nocturnal period for the lower dulaglutide 0.75-mg dose. For dulaglutide 1.5 mg, similar HR increases compared with placebo were reported during both diurnal and nocturnal periods.

Discussion

This review evaluates the effect on HR of six approved GLP-1 RAs, categorized into a short-acting sub-class with half-lives of 3–5 h (exenatide BID and lixisenatide) and a long-acting sub-class with half-lives ranging from 12 h to several days (liraglutide, exenatide LAR, albiglutide and dulaglutide) [16].

A recent meta-analysis of Phase 3 trials reported increases in HR, based on single time point assessments, in the range of 1–4 bpm with both long- and short-acting GLP-1 RAs [15]. However, the present review, which relies specifically on 24-h-averaged HR data, demonstrates that the degree of this positive chronotropic effect was underestimated when assessed by single time point pulse rate measurements. When evaluated with more sensitive and reliable 24-h continuous monitoring and in thorough QT studies, two of the long-acting GLP-1 RAs, liraglutide and albiglutide, were shown to cause a pronounced increase in the 24-h time-averaged mean HR from baseline of up to 6–10 bpm, while for dulaglutide and exenatide LAR, the increase in 24-h mean HR was 3–4 bpm [23, 24, 27,28,29,30]. The two short-acting GLP-1 RAs, exenatide BID and lixisenatide, both caused a maximum HR increase of 8–10 bpm 2–4 h after injection, which returned to baseline levels after approximately 10–12 h (Sanofi, data on file [available on request [22] ] and [19, 20]), with a mean 24-h HR increase of approximately 1–2 bpm for both preparations.

A limitation of the current review is that it focused on indirect comparisons of 24-h continuous monitoring studies that differed in terms of study population (e.g., obese or not-obese, ambulatory or not-ambulatory), study treatment (e.g., continuous intravenous infusion, or oral administration) and timing of assessment after variable duration of study treatment. To overcome this limitation, two independent head-to-head comparisons between short-acting lixisenatide and long-acting liraglutide in subjects with T2DM were also reviewed. These direct comparisons allowed a more sensitive differentiation of HR effects, and confirmed that lixisenatide induces a significantly smaller increase in mean 24-h HR compared with liraglutide (4 vs. 9 bpm; Figs. 3, 5) [17, 18].

It could be hypothesized that there is an association between the PK of the various GLP-1 RAs, the duration of receptor activation/occupancy and the extent of the HR effect. Brief receptor occupancy with short-acting GLP-1 RAs could explain the transient effect on HR, while prolonged receptor occupancy could explain the more pronounced HR effect observed with some long-acting GLP-1 RAs. Furthermore, the longer half-life resulting in receptor activation over 24 h would be in line with the increased HR during the diurnal and nocturnal periods reported for liraglutide and dulaglutide [24, 30]. However, this relationship does not account for the differences in HR increases within the sub-class of the long-acting agents. The differential effects of these molecules could be explained by differences in their affinity for the GLP-1 receptor, especially variations in their binding kinetics, e.g., on/off rates. Furthermore, the differences between the agents in terms of the duration of their effect may be due to tachyphylaxis and/or receptor desensitization.

The underlying mechanism for the increased HR has not yet been fully elucidated. It was initially postulated to be a compensatory mechanism to the blood pressure lowering effect of GLP-1 RAs that was possibly mediated by their vasodilatory effect [9, 31] and/or increased urinary sodium excretion [32]. However, no association between HR and blood pressure was observed in the head-to-head comparison trial of liraglutide and lixisenatide [17] (Fig. 4). It is more likely that increased HR results from a direct GLP-1 receptor-mediated effect on the endogenous sinoatrial pacemaker node of the heart, as GLP-1 receptors are expressed in the human heart in myocytes in the sinoatrial node [33]. Such a direct GLP-1 mechanism is supported by studies using native GLP-1 and exenatide in healthy people and patients with T2DM showing that the acute increase of HR was not preceded by a decrease in blood pressure, was not associated with changes in plasma levels of adrenaline or noradrenaline, and was independent of GLP-1 glucoregulatory effects [11, 34, 35]. A further possibility is that the positive chronotropic effect could be, at least partially, mediated by sympathetic nervous system enhancement, related to the inhibition of the autonomic nervous system [18, 36, 37]. In subjects with T2DM, 24-h Holter ECG and power spectrum analysis of HR variability were conducted before and after liragutide or lixisenatide administration. In the liraglutide group, significant differences were observed in the low (0.04–0.15 Hz)/high (0.2–0.4 Hz) frequency ratio; however, no changes in the low/high frequency ratio were found in the lixisenatide group [18]. This mechanism of action would explain the more marked increase in HR induced by liraglutide in those subjects with T2DM at night when parasympathetic activity is predominant. Diminished parasympathetic modulation of the heart resulting in increased HR was also observed in response to intracerebroventricular infusion of exendin-4 in mice [36].

A substantial volume of data indicates that an elevated HR is independently associated with increased cardiovascular morbidity and mortality in the general population, in subjects with cardiovascular diseases, and those with diabetes [13, 14, 38, 39]. In the action in diabetes and vascular disease (ADVANCE) trial, a study involving 11,140 subjects with T2DM who were followed for a median duration of 4.4 years, a higher HR was associated with a significantly increased risk of all-cause mortality, cardiovascular death, and major cardiovascular events (death, nonfatal acute myocardial infarction [AMI] or nonfatal stroke) [39]. In the same study population, a higher HR was also associated with a greater incidence of new-onset or progressive nephropathy and retinopathy [38]. It is unclear whether a higher HR is directly responsible for the increased cardiovascular risk. However, in support of a causal relationship, lowering of HR by ivabradine, a selective inhibitor of the sinus node I(f) channel, devoid of any activity on blood pressure, cardiac contractility, atrioventricular conduction or ventricular repolarization, decreased the risk of cardiovascular death or hospitalization due to heart failure (HF) in subjects with HF, which is a debilitating condition highly sensitive to changes in HR [40].

HF is one of the most common complications of diabetes, and patients with diabetes are at a higher risk of developing HF [41]. Also, diabetes adversely affects the outcomes of subjects with HF, substantially decreasing their survival rate [42]. Achieving good glycemic control in subjects with T2DM and HF is difficult, as several antihyperglycemic agents have been reported to increase the risk of hospitalization due to HF [43,44,45]. GLP-1 RA treatment might be expected to improve HF outcome by augmenting glucose uptake by the myocardium, a potentially important mechanism in HF as fatty acid metabolism is down-regulated, and adenosine triphosphate synthesis is more dependent on glucose. However, in a recent placebo-controlled crossover study to evaluate the effects of liraglutide in subjects with T2DM and coronary artery disease undergoing dobutamine stress echocardiography (DSE), liraglutide did not improve the systolic function of the left ventricle during DSE or patients’ exercise capacity [46]. The National Heart, Lung and Blood Institute Heart Failure Clinical Research Network designed the Functional Impact of GLP-1 for Heart Failure Treatment (FIGHT) study (NCT01800968) to test the hypothesis that liraglutide would improve myocardium bioenergetics leading to post-hospitalization clinical stability in subjects with advanced HF and reduced left ventricular ejection fraction, with and without diabetes [47]. The study results were published recently [48] and indicated that liraglutide did not improve clinical stability but was rather associated with a numerical but not statistically significant increase in the composite of death or HF hospitalization compared with placebo. Subjects who received liraglutide were also reported to have a higher incidence of arrhythmia vs. placebo (17 vs. 11%, respectively). Similar findings were observed in the Effect of LIraglutide on left VEntricular function in chronic heart failure patients with and without type 2 diabetes (LIVE) study [49, 50]. The trial randomized 241 patients with chronic HF with reduced left ventricular ejection fraction to receive liraglutide or placebo. After 24 weeks’ treatment, there were no significant differences between the groups for the primary endpoint of change in left ventricular ejection fraction, regardless of whether the patients had comorbid diabetes or not. However, patients treated with liraglutide suffered numerically more serious adverse cardiac events than those on placebo (12 vs. 3, respectively; p = 0.04). It is not known whether these adverse clinical outcomes could have been mediated by the pronounced and prolonged increase in HR induced by liraglutide.

The results of the Liraglutide Effect and Action in Diabetes: Evaluation of Cardiovascular Outcome Results (LEADER) trial were published recently [51]. In this randomized trial of more than 9300 subjects with T2DM and high cardiovascular risk, liraglutide was seen to decrease the incidence of the composite cardiovascular primary endpoint (occurrence of death from cardiovascular causes, nonfatal myocardial infarction, or nonfatal stroke) compared with placebo (13.0 and 14.9% in the liraglutide and placebo group, respectively; hazard ratio [HR]: 0.87; 95% confidence interval [CI] 0.78, 0.97). Liraglutide was also associated with a decrease in death from cardiovascular causes and death from any cause, and did not increase the risk of hospitalization due to HF in the overall patient population. No analysis was conducted in the subgroup of patients with HF at baseline (approximately 14%) to determine whether treatment with liraglutide was associated with any change of severity of HF and/or cardiovascular mortality.

The results of the Evaluation of LIXisenatide in Acute coronary syndrome (ELIXA) trial, the first cardiovascular outcomes trial for the short-acting GLP-1 RA lixisenatide, were also published recently [52]. This placebo-controlled study in more than 6000 subjects with T2DM and acute coronary syndrome demonstrated the cardiovascular safety of chronic exposure to lixisenatide. Following a median follow-up of 2.1 years, the risk of suffering a major cardiovascular adverse event (death, nonfatal AMI, nonfatal stroke or hospitalization for unstable angina) was similar in both the lixisenatide and the placebo arms (HR 1.02; 95% CI 0.89, 1.17). Furthermore, lixisenatide showed a consistent neutral effect on all individual components of the primary and secondary endpoints. Importantly, lixisenatide did not increase the risk of hospitalization for HF compared with placebo. The percentages of subjects who were hospitalized for HF were 4.0 and 4.2% in the lixisenatide and placebo group, respectively (HR 0.96; 95% CI 0.75, 1.23).

While LEADER and ELIXA were similar in terms of their overall design, there were some major differences between the patient populations enrolled in the two studies. Most notably, the patients enrolled in LEADER had chronic cardiovascular risk (either a pre-existing cardiovascular condition or a high risk for cardiovascular disease), while only those individuals who were within 180 days post-acute coronary event and, hence, at the highest risk of a further cardiovascular event, were included in ELIXA. As a result of the different event rates in the two studies, the median durations of follow-up were also substantially different (3.8 years in LEADER vs. 2.1 years in ELIXA). Reduction of atherosclerosis requires long-term treatment [53], hence longer trials are better suited to show a reduction in risk of myocardial infarction or other atherosclerotic complications of diabetes. Furthermore, several key baseline characteristics were also different between the two study populations. For example, mean ± standard deviation glycated hemoglobin levels were 8.7 ± 1.5% in LEADER and 7.7 ± 1.3% in ELIXA. As these and other differences between ELIXA and LEADER may have affected the overall results of the two studies, comparisons between them and extrapolations from one study to another should be made with caution.

Overall, the findings from these two recently completed cardiovascular outcomes trials suggest that the increases in HR associated with the short-acting GLP-1 RA, lixisenatide, or the long-acting GLP-1 RA, liraglutide, do not lead to an increased risk of major adverse cardiac events in patients with T2DM and high cardiovascular risk. Cardiovascular outcomes trials are still ongoing for the other GLP-1 RAs (Table 2) and will provide further insight on the CV effects of these agents.

Table 2 Ongoing CVOT for GLP-1 RAs
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Conclusions

In conclusion, this review shows that long-acting GLP-1 RAs induce a pronounced and prolonged increase in 24-h mean HR, while short-acting agents lead to a more transient increase that reverts to baseline levels within a few hours after injection. The underlying mechanisms for increased HR remain to be fully elucidated, but may be related to a direct GLP-1 receptor effect on myocytes in the sinoatrial node of the human heart and/or stimulation of the sympathetic nervous system. According to the recently completed ELIXA and LEADER trials, an increase in HR, regardless of its magnitude, does not appear to increase the cardiovascular risk of individuals with T2DM and with (or at high risk of) cardiovascular disease. However, a pronounced increase in HR may be associated with adverse clinical outcomes in subjects with both T2DM and advanced HF.

Abbreviations

ADVANCE:

action in diabetes and vascular disease

AMI:

acute myocardial infarction

BID:

twice daily

bpm:

beats per minute

CI:

confidence interval

CVOT:

cardiovascular outcome trial

ELIXA:

Evaluation of LIXisenatide in Acute coronary syndrome

FIGHT:

Functional Impact of GLP-1 for Heart Failure Treatment

GLP-1 RA:

glucagon-like peptide-1 receptor agonist

HF:

heart failure

HR:

heart rate

LAR:

long-acting release

LEADER:

Liraglutide Effect and Action in Diabetes: Evaluation of Cardiovascular Outcome Results

LIVE:

Effect of LIraglutide on left VEntricular function in chronic heart failure patients with and without type 2 diabetes

LS:

least squares

PK:

pharmacokinetic

QD:

once daily

QW:

once weekly

SE:

standard error

T2DM:

type 2 diabetes mellitus

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Authors’ contributions

ML and FL conducted the literature searches and reviewed the identified studies. CR-D and AL were responsible for analyzing data from unpublished studies. ML, FL, CR-D and RP extracted the necessary data from the final studies, drafted and revised the manuscript. DO, DR and LB contributed to the analyses and interpretation of the data and revised the manuscript for important intellectual content. All authors read and approved the final manuscript.

Acknowledgements

Editorial assistance for this publication was provided by Christina Holleywood, PhD., and Stephen Craig, PhD. (Caudex, Oxford, UK), funded by Sanofi.

Competing interests

ML, FL, CR-D, AL, and RP are employees of, and are shareholders in, Sanofi. DO has served as a speaker for Boehringer Ingelheim, Eli Lilly and Novo Nordisk, and served on advisory boards for Roche Diagnostics and Sanofi. DR has served on an advisory panel and as an author for Bristol-Myers Squibb, Eli Lilly, Medtronic, Merck, Novartis, Novo Nordisk and Sanofi, and has served on an advisory panel and as speaker for AstraZeneca, Eli Lilly, Janssen, Novartis, Novo Nordisk and Sanofi. LB has served as a consultant for AstraZeneca, GlaxoSmithKline, Intarcia Therapeutics, Inc., Janssen Pharmaceuticals, Inc., Merck & Co., Inc., Novo Nordisk and Sanofi, has participated in speaker bureaus for AstraZeneca, Janssen Pharmaceuticals, Inc., Merck & Co., Novo Nordisk and Sanofi, and has received research support from AstraZeneca, Janssen Pharmaceuticals, Inc., Lexicon Pharmaceuticals, Inc., Merck & Co., Novo Nordisk and Sanofi.

Data from this manuscript were published in abstract form in the proceedings of the 75th Annual Meeting of the American Diabetes Association, Boston, MA, USA, 5–9 June 2015; as an oral communication at the 51st Annual Meeting of the European Association for the Study of Diabetes, Stockholm, Sweden, 14–18 September 2015; as a poster at the 76th Annual Meeting of the American Diabetes Association, New Orleans, LA, USA, 10–14 June 2016; and as a poster at the 52nd Annual Meeting of the European Association for the Study of Diabetes, Munich, Germany, 12–16 September 2016.

Availability of data and materials

The data that support the findings of this study are available from the corresponding author upon reasonable request.

Funding

This study was sponsored by Sanofi.

Author information

Authors and Affiliations

  1. R&D Diabetes Division, Sanofi-Aventis Deutschland GmbH, Industrial Park Höchst, Bldg. H831, 65926, Frankfurt am Main, Germany

    Martin Lorenz

  2. R&D Diabetes Division, Sanofi, Bridgewater, NJ, USA

    Francesca Lawson

  3. Institute of Life Sciences College of Medicine, Swansea University, Swansea, UK

    David Owens

  4. University Hospital Sainte-Marguerite, Marseille, France

    Denis Raccah

  5. R&D Diabetes Division, Sanofi, Chilly-Mazarin, France

    Christine Roy-Duval

  6. R&D Clinical Sciences & Operations, Sanofi-Aventis Deutschland GmbH, Frankfurt am Main, Germany

    Anne Lehmann

  7. Global Medical Affairs, Sanofi, Bridgewater, NJ, USA

    Riccardo Perfetti

  8. Department of Endocrinology, Frank Riddick Diabetes Institute, Ochsner Medical Center, New Orleans, LA, USA

    Lawrence Blonde

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  1. Martin Lorenz
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Correspondence to Martin Lorenz.

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Lorenz, M., Lawson, F., Owens, D. et al. Differential effects of glucagon-like peptide-1 receptor agonists on heart rate. Cardiovasc Diabetol 16, 6 (2017). https://doi.org/10.1186/s12933-016-0490-6

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Keywords

  • Type 2 diabetes mellitus
  • Glucagon-like peptide-1 receptor agonist
  • Heart rate

Cardiovascular Diabetology

ISSN: 1475-2840