Agomelatine in the treatment of mild-to-moderate depression in patients with cardiovascular disease: results of the national multicenter observational study PULSE
Authors Medvedev VE
Received 8 December 2016
Accepted for publication 3 March 2017
Published 21 April 2017 Volume 2017:13 Pages 1141—1151
Checked for plagiarism Yes
Review by Single anonymous peer review
Peer reviewer comments 3
Editor who approved publication: Dr Roger Pinder
Vladimir E Medvedev
Department of Psychiatry, Psychotherapy and Psychosomatic Pathology, RUDN University, Moscow, Russia
Background: PULSE was a large, observational, multicenter study designed to evaluate the efficacy and safety of agomelatine in the treatment of major depression in patients with cardiovascular disease (CVD).
Methods: Patients with mild-to-moderate major depressive episodes, without psychotic symptoms, were treated as outpatients or in cardiac facilities in 46 regions of Russia. The patients received antidepressant monotherapy with agomelatine 25 or 50 mg, once daily, for 12 weeks.
Results: The mean age of the patients (N=896) was 51.4±9.9 years, and 68.5% were women. A progressive improvement in the total score on both the anxiety and depression subscales of the Hospital Anxiety and Depression Scale (HADS), from 13.1±3.8 and 13.9±3.1 at baseline to 3.7±2.8 and 3.9±3.0, respectively, was observed by 12 weeks. All individual HADS scores improved rapidly; the change between visits was also significant (P<0.0001). The majority (84.6%) were remitters (HADS total score <7) by 12 weeks. The Clinical Global Impression – Severity and Improvement scores also improved quickly. The mean hypochondria index (Whiteley Index) decreased significantly from 48.0±11.8 at baseline to 25.2±9.2 at 12 weeks (P<0.0001). The main hemodynamic indices improved or remained stable, and biochemical parameters reflecting liver function (aspartate aminotransferase, alanine aminotransferase, gamma-glutamyl transpeptidase, alkaline phosphatase, total bilirubin) did not exceed three times the upper limits of established norms.
Conclusion: Agomelatine resulted in statistically significant improvements in depressive symptoms, anxiety, and hypochondria in depressed patients with CVD, and had good tolerability. Our data suggest that agomelatine is safe to treat depression in patients with CVD.
Keywords: depression, cardiovascular disease, agomelatine, anxiety, hypochondria, tolerability
Patients with cardiovascular disease (CVD) are three times more likely to experience depression than other members of the community.1 Depression is more frequently observed in ambulatory cardiac patients (9.3%) than in the general population (4.8%), and in patients undergoing treatment in hospital.2,3 Large, international, epidemiologic studies have shown that many patients treated by physicians, including cardiologists and neurologists, have some form of clinical depression that requires antidepressant therapy.4 Depression affects around one-fifth of heart failure patients (21%) and between 15% and 20% of patients admitted to hospital for myocardial infarction.5,6 Patients with CVD diagnosed with depression have an increased risk of poor cardiovascular outcomes.7,8 However, it is not clear whether treatment with antidepressants improves or worsens this risk.9,10
Tricyclic antidepressants and monoamine oxidase inhibitors are contraindicated in many patients with CVD as they are considered cardiotoxic, while selective serotonin reuptake inhibitors (SSRIs) are considered effective for treating depression in CVD patients and may even improve patient prognosis.11,12 However, the SADHART-CHF (Sertraline Against Depression and Heart Disease in Chronic Heart Failure) study showed that while sertraline was safe, it was not effective in treating depression and had no impact on short- or long-term cardiovascular events or survival.13 Examination of data from the REGARDS (Reasons for Geographic and Racial Differences in Stroke) study in stroke patients using an antidepressant at baseline found antidepressant use was associated with a small increase in risk of all-cause mortality.14 Furthermore, antidepressants have been associated with an increased risk of stroke in two other studies.15,16 Nonetheless, a large cohort study found no association between SSRI use and poor cardiovascular outcomes, and even reported a reduction in risk of myocardial infarction.17
There is a real need for an effective and safe agent for the treatment of depression in patients with CVD. It is estimated that approximately 15%–25% of depressed cardiac patients stop taking antidepressants due to adverse events within 6 months of treatment initiation, highlighting the importance of selecting an antidepressant with good tolerability.18 Treatment of depression in CVD patients requires careful monitoring, and drugs that are known to be well tolerated and safe should be the first choice of the prescriber.
Agomelatine has been shown to demonstrate antidepressant efficacy in both short- and long-term studies19,20 as well as in clinical practice,21–23 and is unique among antidepressive agents in its ability to relieve anhedonia early in treatment.24,25 Due to its novel pharmacology (melatonergic receptor agonist and 5-hydroxytryptamine 2C [5HT2C] receptor antagonist) and good tolerability profile,19,26 agomelatine could be a good candidate for the treatment of depression in patients with CVD, but no specific studies have evaluated agomelatine in CVD patients so far. An increase in liver transaminases has been observed in some patients treated with agomelatine, and hence, liver function tests are required. The purpose of this national, multicenter, observational program “PULSE” was therefore to obtain data on the efficacy and tolerability of agomelatine at standard doses for the treatment of mild and moderate depressive disorders in a range of patients with CVD in attending cardiologists in Russia.
Patients and methods
This study included men and women with CVD, between 18 and 65 years old, having a score of ≥11 points on the depression subscale of the Hospital Anxiety and Depression Scale (HADS), and fulfilling the criteria of the International Classification of Diseases, Tenth Edition, for depressive episodes of mild or moderate severity without psychotic symptoms, suicidal thoughts and intentions, and seasonal changes of state.
For women with intact reproductive function, an obligatory condition of participation was the use of adequate medical contraception. This study was approved by the Local Ethics Committee of RUDN University. All patients provided written informed consent to participate in the study. The patients were diagnosed with depression primarily by cardiologists. This diagnosis was confirmed by a psychiatrist. Antidepressive treatment was prescribed by cardiologists.
Patients who were under psychiatrist supervision and/or were taking any psychotropic drugs, who had alcoholism or a history of drug addiction, a history of idiosyncrasy, or had been previously treated unsatisfactorily with agomelatine (administered at an adequate dose [25–50 mg/day] and for adequate duration [at least 4 weeks]) were not included. Patients were also excluded if they had severe somatic disorders including oncologic, hepatologic, and neurologic diseases, were taking inhibitors of cytochrome P450 1A2 (eg, ciprofloxacin, fluvoxamine), were pregnant or breast-feeding, or had lactase deficiency, galactosemia, or glucose–galactose malabsorption.
Patients received a once-daily treatment of agomelatine for depression, at either 25 mg or 50 mg always at bedtime, over a period of 12 weeks. During this time, patients were examined by a doctor at four mandatory visits: enrollment visit (W0), and after 3 weeks (W3), 6 weeks (W6), and 12 weeks (W12). The following range of psychometric instruments was used for patient assessment at each visit: HADS questionnaire, Clinical Global Impression – Severity (CGI-S) and Clinical Global Impression – Improvement (CGI-I) scales, a visual analog scale (VAS), reactive anxiety subscale of Spielberger–Khanin anxiety scale, Whitely hypochondria index, and Short Form 36 (SF-36) quality-of-life questionnaire.
Treatment tolerability was assessed by the spontaneous reporting of complaints by patients and by changes in the main clinical parameters. A standardized, routine physical examination included assessment of blood pressure, heart rate, body weight, and biochemistry at each visit. Liver enzyme monitoring (aspartate aminotransferase and alanine aminotransferase) was performed following the recommendations of the Agomelatine Summary of Product Characteristics including the following: performing baseline liver function tests in every patient before starting treatment with agomelatine, not starting treatment if serum transaminases exceeded three times the upper limit of normal (ULN), and monitoring liver function at 3, 6, and 12 weeks.
Results were statistically processed using specialized computer programs (SPSS 16.0). Student’s t-test for paired samples was used for within-group comparisons of continuous variables that were normally distributed, and Wilcoxon’s test for those that were not normally distributed. Student’s t-test for independent samples was used for between-group comparisons of continuous variables, and the Mann–Whitney test for those not normally distributed. The χ2 test was used for categorical variables. All tests were two-sided, and the type I error rate was 5%.
A total of 293 cardiologists from 46 regions in Russia enrolled 896 patients between October 2012 and April 2013. Of these, 20 patients (2.2%) dropped out prematurely, leaving 876 patients eligible for analyses. The sociodemographic characteristics of the patients are presented in Table 1. Depression of mild or moderate severity occurred predominantly in women aged around 50 years (51.4±9.9 years) who were married, employed, and had a level of higher education (Table 1). In addition to CVD, patients typically had concomitant disorders affecting the endocrine, digestive, respiratory, and nervous systems (Table 2). A list of the most prescribed non-psychotropic therapy, administered to >5% of patients, is presented in Table 3. Just under two-thirds of patients (60%) were diagnosed with depression of moderate severity, with the remainder having a diagnosis of mild depressive episode.
Table 1 Baseline demographics and patient characteristics
Table 2 Concomitant diseases
Table 3 Main non-psychotropic therapy use
The most prevalent symptoms of depression – diagnosed by cardiologists – in addition to depressed mood, included sleep disturbances, fatigue, cognitive impairment, and anhedonia (Figure 1). Cardiologists were less likely to identify ideas of insignificance, decreased libido, and changes in appetite.
Figure 1 Frequency of distribution of depressive symptoms diagnosed by cardiologists.
Effectiveness of therapy
The majority of patients (758 [86.5%]) included in the analyses were receiving agomelatine as a 25 mg daily dose, with only 118 patients (13.5%) receiving 50 mg per day. The HADS total score was significantly reduced by 12 weeks and at each visit compared with the previous (P<0.0001, Table 4). The majority of patients (84.6%) were in remission by week 12 (HADS total score <7).
There was a statistically significant decrease in anxiety (Spielberger–Khanin questionnaire) at each subsequent visit compared with the previous visit, with the number of patients with severe reactive anxiety decreasing from 840 (95.9%) to 131 (15%) by week 12 (P<0.0001) (Figure 2). The Whiteley Index for hypochondria also decreased significantly (P<0.0001) over the course of 12 weeks of treatment with agomelatine, with the number of patients with severe hypochondria decreasing from 784 (89.5%) to 176 (20.1%) (Figure 3).
Figure 2 Mean Spielberger–Khanin reactive anxiety subscale scores from baseline to week (W) 12.
Figure 3 Mean Whiteley Index for hypochondria scores from baseline to week (W) 12.
Physicians reported an increase in the overall effectiveness of agomelatine as measured using the CGI-I scale, with 69.3% of patients classed as showing a “significant improvement” compared with baseline. The overall assessment of the severity of the patient’s condition on the CGI-S scale also showed a steady increase in the proportion of patients in remission or “borderline state” (Figure 4). Furthermore, by the end of therapy, the number of patients graded as “moderately” and “substantially ill” had significantly reduced from 92.9% to 20.9%.
Figure 4 Proportion of patients with depression of varying severity from baseline to week (W) 12 (Clinical Global Impression – Severity).
The subjective assessment of patient health on the VAS improved significantly during 12 weeks of agomelatine treatment, dropping from 7.0 to 2.9 points (P<0.0001). The improvements observed were also statistically significant compared with the previous visit (P<0.0001).
In general, the assessment of agomelatine efficacy by cardiologists and patients was similar and was described as “good” to “excellent” by 96% of physicians and 97% of patients who completed the study.
Quality of life
Results from the SF-36 quality-of-life questionnaire indicated that agomelatine was highly efficacious and safe when treating depression in patients with CVD (Figure 5). Eight quality-of-life parameters allowed two integral parameters of the SF-36 scale to be characterized: physical and mental components of health. The values of both components increased early in the study and continued to increase until study completion with statistically significant improvements compared with baseline (P<0.0001) (Figure 6).
Figure 5 Mean scores for indicators of patients functioning according to the Short Form 36 quality-of-life questionnaire.
Figure 6 Mean scores for physical health and mental health components (Short Form 36 integrated indices of health) from baseline to week (W) 12.
The tolerability of agomelatine for the treatment of mild and moderate depression in patients with CVD was considered good. Subjectively intolerable adverse events (increased anxiety and agitation, increased insomnia and dizziness) led to the withdrawal of only five out of the 20 patients who prematurely dropped out of the study. Treatment tolerability was considered as “excellent” by 82% of physicians and 75% of patients. The majority of patients (83.6%) agreed to continue the treatment if necessary.
The physical characteristics of patients obtained at weeks 0 and 12 – before and after receiving the combined antidepressive and non-psychotropic (cardiotropic) therapy – are summarized in Table 5. Patients’ heart rate as well as systolic and diastolic blood pressure values were significantly lower at 12 weeks (P<0.0001). Patient body weight after 12 weeks of therapy was lower than before therapy (P<0.0001), but the difference did not exceed 5% of body weight at baseline.
Liver function parameters obtained over the 12-week treatment period are summarized in Table 6. Transaminase levels were increased to below or equal to the ULN in around 3%–6% of patients after 6 weeks of treatment, but there were no cases where liver function parameters were threefold more than the ULN range at baseline. At baseline, 0.2% and 0.7% of patients, respectively, had values of alkaline phosphatase and gamma-glutamyl transpeptidase superior to normal, but less than or equal to three times the ULN. After treatment, no liver function parameters were threefold more than the ULN (Table 6).
In this prospective, observational study, agomelatine proved effective for the treatment of depressive disorders in patients with CVD evaluated using a range of psychometric measures, and was well tolerated. Results were observed from the first post-baseline visit at week 3 and continued to improve throughout the study with statistically significant changes at each evaluation compared with the previous visit and with baseline. Early symptom relief is important, particularly in patients with CVD, as comorbid depression worsens CVD prognosis.27 Depression has also been associated with other behaviors that impact on CVD, such as medication nonadherence, that reduce the likelihood of successful disease management.27
An ideal treatment for depressive disorders would provide symptom relief followed by the restoration of normal functioning and prevention of relapse. In this study, HADS scores for anxiety and depression decreased from 13.1 and 13.9, respectively, at baseline to 3.7 and 3.9, respectively, at week 12 with agomelatine. Furthermore, the majority of patients (84.6%) were in remission by week 12. These results are in agreement with those obtained with agomelatine in clinical trials and clinical practice. The efficacy of agomelatine in patients with major depressive disorder has been extensively evaluated in a number of randomized, head-to-head clinical trials. Long-term treatment with agomelatine demonstrates a sustained duration of action.28 A meta-analysis of published and unpublished short-term studies involving agomelatine in the treatment of depression that included 20 trials and around 7,500 participants suggested similar efficacy to standard antidepressants including paroxetine, fluoxetine, escitalopram, sertraline, and venlafaxine.19 Furthermore, those randomized to agomelatine were also less likely than those receiving comparator antidepressants to discontinue treatment because of adverse effects. A pooled analysis of four published 24-week studies suggested that treatment with agomelatine was at least as effective as treatment with SSRIs in the long term.29
CVD and depression often have overlapping symptoms such as fatigue, low energy, and difficulty in sleeping and carrying out daily routines of life. It is therefore not surprising that the symptoms of depression are sometimes thought to be due to CVD alone. Considering the prevalence of depression among CVD patients, it is important that cardiologists easily identify the key symptoms of depression such as hypothymia, anhedonia, fatigue, sleep disturbances, and cognitive impairments. One of the most common symptoms in this study was hypochondria, which could be caused by the presence of both serious somatic disease and affective (anxious–depressive) disorders, and was significantly reduced by the end of the study.
Agomelatine was also effective at relieving other key symptoms of depression including anxiety and hypochondria, both of which improved significantly at each visit compared with the last, throughout the study. Anxiety within depression is common and associated with worse prognosis, increased disability, and higher use of medication. The ability of agomelatine to improve anxiety in patients suffering from depression and CVD confirms findings from a pooled analysis of nearly 2,000 patients with major depressive disorder from six studies of 6–8 weeks duration: three placebo-controlled and three versus comparator antidepressants.30 In this analysis, agomelatine reduced the Hamilton Depression Rating Scale (HAM-D) score as early as the second week (P<0.004) compared with placebo, and the reduction remained significant over the entire study (P<0.001). Compared with the other drugs in the study, agomelatine proved more effective in reducing anxiety symptoms with a substantial difference on the Hamilton Anxiety Rating Scale of 1.39 points (P=0.006).
Quality of life is significantly decreased in patients with CVD suffering from depression, and improvement or restoration of quality of life is an important aspect of disease management. In the current study, agomelatine was associated with an improvement in both physical and mental quality-of-life components, which occurred early in the study and continued to improve until study completion.
Although this is the first observational study of agomelatine in an exclusively CVD population, several other observational studies have examined the treatment effects and tolerability of the drug for depressive symptoms in a broad range of patients in clinical practice. In the large CHRONOS observational study conducted in Russia, patients demonstrated statistically significant changes in the HAM-D during treatment.23 A German observational study, which included severely depressed patients and elderly patients with comorbid conditions, including CVD, also reported improvements throughout the study.21
The efficacy of agomelatine in depression is thought to be due to its pharmacological profile, acting as both an agonist to melatonergic receptors and an antagonist to 5HT2C receptors. These receptors act in synergy to increase dopaminergic and noradrenergic neurotransmission, and there is a selective release of both neurotransmitters in the prefrontal cortex.31,32 Furthermore, it has no effect on extracellular serotonin in the brain, and thus, there is no dampening effect of serotonin in the release of dopamine, as may occur with the SSRIs and serotonin–norepinephrine reuptake inhibitors (SNRIs).33,34 This potentiation of noradrenaline and dopamine with no effect on serotonin release is consistent with the known clinical actions of agomelatine in depression including improvement of anhedonia and reduction of emotional blunting. This receptor profile is also responsible for the good adverse event profile of agomelatine, which differs from SSRI and SNRI antidepressants, especially with regard to gastrointestinal side effects, headache, sexual dysfunction, and psychomotor agitation.35 Even though no head-to-head studies with agomelatine and comparator treatments have been conducted in patients with CVD and depression, agomelatine may prove particularly beneficial in these patients because of its favorable CVD safety profile. In addition to efficacy, the side-effect profile of antidepressants and their potential for significant drug interactions is important in patients with CVD as they are likely to be suffering from other comorbidities and taking a number of concomitant medications. In this study, agomelatine was well tolerated, the side effects being those already documented in the Summary of Product Characteristics for agomelatine. There were no cases of liver function parameters exceeding threefold the ULN during the study.
The observed changes in somatic symptom disorders suggest that there was a positive effect of combining agomelatine and a non-psychotropic agent (cardiotropic) that was not accompanied by the development or potentiation of significant adverse events. The improvements in heart rate, and systolic and diastolic blood pressure values could have been due to an effective cardiotropic therapy, or the result of an effective combination of therapies including agomelatine. The ability of agomelatine to normalize patients’ mental state may have resulted in a decrease in distressing thoughts, feelings, and behaviors regarding their somatic symptoms, including the frequency and severity of exacerbations of somatic symptoms.
Agomelatine therapy was associated with a decrease in body weight after 12 weeks, but this did not exceed 5% of body weight at baseline. While the weight loss is unlikely to have been related to the pharmacological properties of agomelatine, it may have been a consequence of the improvements in many of the somatic symptom disorders that were assessed in this study. As such, this is an important finding as weight loss is often considered a positive step in patients with CVD.
A number of antidepressants have unwanted cardiovascular effects, and when treating depression in CVD, the choice of treatment requires a careful balance of safety and efficacy. For example, hypertension can be significant with venlafaxine36 and monoamine oxidase inhibitors. Other treatments have been associated with dose-dependent effects on repolarization interval, characterized by lengthening of the QT interval on an electrocardiogram, a marker of arrhythmic risk.37 In a pharmacovigilance study, using health records from 38,397 patients treated with antidepressants, statistically significant evidence of modest QT prolongation was identified for the tricyclic antidepressant amitriptyline, as well as for citalopram and escitalopram.38 In contrast, agomelatine up to 400 mg has been shown to have no effect on the QTc interval in healthy volunteers.39
Some antidepressant agents with demonstrated efficacy in major depressive disorder may be less effective in patients with certain cardiac conditions. For example, both the SADHART-CHF study with sertraline13 and the recently published MOOD-HF study (Effects of Selective Serotonin Re-Uptake Inhibition on Morbidity, Mortality, and Mood in Depressed Heart Failure Patients) with escitalopram40 showed that while the drugs were safe, they did not provide a greater reduction in depressive symptoms than placebo or have a greater impact on cardiovascular events or survival. This was despite the fact that MOOD-HF followed patients for over 18 months.40 These findings led both sets of study authors to suggest that the pathophysiology of depression in patients with heart failure may have unique characteristics that may be less responsive to some antidepressant therapies. In the current observational study, agomelatine was effective in patients presenting with a range of CVDs including hypertension, angina, myocardial infarction, atherosclerosis, rhythm and conduction disturbances, as well as chronic heart failure.
This study was subject to the inherent limitations of observational studies including susceptibility to selection bias and confounding. In addition, the number of patients per investigator was small, which could overemphasize the significance of the results. The lack of a control group also limits the conclusions that can be drawn from the study.
Real-world observational studies nevertheless remain valuable for evaluating efficacy and safety of a treatment in a broad range of patients who more closely reflect routine clinical practice than those found in the restricted populations of randomized controlled trials. This also ensures that drug safety is monitored in a broad population of patients.
Depression and CVD are both widespread among the general population and often occur simultaneously in the same individual. The results of this multicenter, observational study show that agomelatine provides a statistically significant improvement in depressive symptoms, anxiety, and hypochondria in depressed patients with a range of CVDs and demonstrates good tolerability. Quality of life was significantly improved, and the majority of patients and cardiologists reported agomelatine efficacy as good to excellent. The results of this observational study suggest that agomelatine is an effective and safe choice for the treatment of depression in patients with CVD.
The author acknowledges the efforts of Khristina Rogozskaya (Samara Regional Clinical Cardiological Dispensary, Samara), Dr Anna Porfirieva (City Hospital #15, Saint Petersburg), Dr Nikolay Dovgany (Ekaterinburg Regional Clinical Hospital #1, Ekaterinburg), Dr Elena Zhovtilinova (Orenburg Regional Clinical Hospital, Orenburg), Dr Kirill Soldatov (Kuzbass Cardiology Center, Kemerovo), Dr Vyacheslav Trunov (Regional Clinical Cardiological Dispensary, Tver), Dr Leyla Fachikova (City Clinical Hospital #7, Kazan), Dr Vasiliy Yanushko (City Clinical Hospital #5, Nizhny Novgorod), Dr Olyga Ivanova (Ryazan City Hospital #4, Ryazan), Dr Yulia Samshitova (Kursk Regional Clinical Hospital, Kursk), Dr Anna Trol (City Hospital #1, Voronezh), Dr Julia Borisova (Diagnostic and Treatment Center, Saratov), Dr Fedor Ovchinkin (Novosibirsk Regional Clinical Hospital, Novosibirsk), Dr Boris Brun (City Hospital #1, Irkutsk), Dr Grigoriy Kuskov (Municipal Cardiologic Polyclinic, Khabarovsk), Dr Inna Promes (Perm Regional Clinical Hospital, Perm), and Dr Irina Zamurzina (Regional Clinical Hospital, Krasnoyarsk) for coordination of the study. There was no funding source for the study. English language editing was provided by a freelance medical writer and funded by Servier.
The author reports no conflicts of interest in this work.
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