Serious bradycardia and remdesivir for coronavirus 2019 (COVID-19): a new safety concerns.

OBJECTIVES: In recent clinical trials some cardiac arrhythmias were reported with use of remdesivir for COVID-19. To address this safety concern, we investigated whether use of remdesivir for COVID-19 is associated with an increased risk of bradycardia.
METHODS: Using VigiBase®, the World Health Organization Global Individual Case Safety Reports database, we compared the cases of bradycardia reported in COVID-19 patients exposed to remdesivir with those reported in COVID-19 patients exposed to hydroxychloroquine, lopinavir/ritonavir, tocilizumab or glucocorticoids. All reports of patients with COVID-19 registered up to the 23 September 2020 were included. We conducted disproportionality analyses allowing the estimation of reporting odds ratios (RORs) with 95% CI.
RESULTS: We found 302 cardiac effects including 94 bradycardia (31%) among the 2603 reports with remdesivir prescribed in COVID-19 patients. Most of the 94 reports were serious (75, 80%), and in 16 reports (17%) evolution was fatal. Compared with hydroxychloroquine, lopinavir/ritonavir, tocilizumab or glucocorticoids, the use of remdesivir was associated with an increased risk of reporting bradycardia (ROR 1.65; 95% CI 1.23-2.22). Consistent results were observed in other sensitivity analyses. DISCUSSION: This post-marketing study in a real-world setting suggests that the use of remdesivir is significantly associated with an increased risk of reporting bradycardia and serious bradycardia when compared with the use of with hydroxychloroquine, lopinavir/ritonavir, tocilizumab or glucocorticoids. This result is in line with the pharmacodynamic properties of remdesivir.

Introduction

Remdesivir is a phosphoramidate prodrug. Its triphosphate form is close to adenosine triphosphate (ATP) and inhibits RNA-dependent RNA-polymerases (RdRp) from distinct Coronaviridae such as SARS-CoV-2 [1]. In vitro and animal models demonstrated the antiviral activity of remdesivir. Remdesivir was authorized by the Food and Drug Agency (FDA) for suspected or laboratory-confirmed COVID-19 in hospitalized adult or paediatric patients, irrespective of their severity of disease. While safety signals emerged concerning hepatic disorders, little is known about its cardiac safety [2]. In the clinical trial evaluating the effects of remdesivir on Ebola virus, arterial hypotension and cardiac arrest in one patient in the remdesivir group (among 175) was described [3]. In the first COVID-19 clinical trial, another cardiac arrest was reported in a patient exposed to remdesivir [4]. In this study, a higher proportion of patients with remdesivir treatment discontinued due to an adverse event, including worsened cardiopulmonary status compared with those patients receiving placebo. In the Adaptive Covid-19 Treatment Trial (ACTT-1), more cardiac arrhythmias occurred with the use of remdesivir than with placebo (8‰ versus 2‰) [5]. While most trials are powered to detect benefits but not adverse events, there is an urgent need to investigate this safety concern [6]. Using VigiBase®, the World Health Organization Global Individual Case Safety Reports database, we determined whether use of remdesivir is associated with an increased risk of reporting bradycardia and serious bradycardia with in COVID-19 patients.

Materials and methods

wThis pharmacovigilance study was conducted using VigiBase®. The WHO pharmacovigilance database gathers more than 23 million spontaneous reports of suspected adverse drug reactions from more than 130 countries, covering more than 90% of the world's population. Each safety report includes information related to the reporter, the patient, the suspected and concomitant drugs, and the adverse drug reactions. The seriousness of each adverse drug reaction is also recorded. According to the official definition, a serious adverse effect is as any effects leading to death, invalidation, significant incapacity, after-effects, malformations, congenital anomalies, birth defects or requires hospitalization or prolongation of hospital stay. VigiBase® identified duplicate reports which are removed from the database. The Medical Dictionary for Regulatory Activities (MedDRA®) are used to code each adverse drug reaction. According to the clinical research French law, review by an ethics committee is not required for such observational studies. As all data from VigiBase® were deidentified, patient informed consent was not necessary.

All reports of patients with COVID-19 registered up to the 23 September 2020 were included. We performed disproportionality analysis to assess a potential increased risk of reporting bradycardia with remdesivir compared with drugs prescribed in COVID-19 patients. Reporting Odds Ratio (ROR) with 95% CI was calculated to estimate the risk of reporting bradycardia. ROR is a ratio similar in concept to the odds ratio in case–control studies and corresponds to the exposure odds among reported cases of bradycardia over the exposure odds among reported non-cases. To test the robustness of our main analyses, four sensitivity analyses were conducted. First, to limit the potential of confounding by disease severity, we repeated the primary analysis considering only users of tocilizumab or glucocorticoids, drugs recommended in patients with severe COVID-19. Second, we restricted our analysis to only serious bradycardia. Third, we included all reports where COVID-19 drugs were defined as suspected or concomitant by reporters. Fourth, as a recent study suggested a risk of cardiac arrhythmias with hydroxychloroquine, we performed a head-to-head comparison (remdesivir versus hydroxychloroquine) [7]. In addition, to address the effect of age and sex, we used stratification analyses according age groups (≤44 years, 45–64 years and ≥65 years) and sex.

Results

We identified 6574 reports with remdesivir or other drugs prescribed in COVID-19 patients. Among the 2603 reports with remdesivir, 302 were registered as cardiac effects. Among these cardiac reports, we found 94 bradycardia reports (31%), mainly from the United States (88, 93%). Patients with bradycardia had wide spectrum of age (61.2 ± 18.1 years, 6–90 min–max), were mostly men (53, 56%), with a mean body weight of 93 ± 28.3 kg. Mean treatment duration with remdesivir was 3.5 ± 1.8 days (range 1–9). Remdesivir was the sole suspected drug in 88 patients (94%). Two-thirds of patients (61, 65%) did not received concomitant cardiovascular medications. Most of reports were serious (75, 80%) and in 16 reports (17%) evolution was fatal. Furthermore, concurrent cardiovascular adverse effects occurred in 22 (23%) patients, mostly hypotension (10). The median onset of bradycardia was 2.4 days (range 1–6) (data available for 18 reports). For bradycardia reports with remdesivir, reporters were mostly pharmacists (77 cases 82%) followed by physicians (11 cases, 12%) and other health professional (4 cases, 4%) (two cases reporters were unknown).

Compared with hydroxychloroquine, lopinavir/ritonavir, tocilizumab or glucocorticoids, the use of remdesivir was associated with an increased risk of reporting bradycardia (ROR 1.65; 95% CI 1.23–2.22) (Table 1 ). The ROR remained significant (3.52, 95% CI 1.70–7.28) when the analysis was retitrated to tocilizumab or glucocorticoid users in the reference group. Consistent results were observed in other sensitivity analyses and according age groups and sex.

Table 1

Reporting odds ratios for the association between bradycardia and the use of remdesivir for coronavirus disease 2019 in vigibasea

	Casesb	Non-casesc	ROR (95% CI)
Primary analysis
Other drugs prescribed for COVID-19d	88	3883	1 (reference)
Remdesivir	94	2509	1.65 (1.23–2.22)
Restricting to drugs used for severe COVID-19
Tocilizumab or glucocorticoids	8	751	1 (reference)
Remdesivir	94	2509	3.52 (1.70–7.28)
Restricting to reports of serious adverse effectse
Other drugs prescribed for COVID-19d	60	9911	1 (reference)
Remdesivir	75	2528	1.93 (1.37–2.72)
Including reports where drugs was defined as suspected or concomitantf
Other drugs prescribed for COVID-19d	124	4928	1 (reference)
Remdesivir	94	2536	1.47 (1.12–1.93)
Head-to-head comparison
Hydroxychloroquine	61	2810	1 (reference)
Remdesivir	94	2509	1.73 (1.25–2.39)
Age groupsg
≤44 years
Other drugs prescribed for COVID-19d	8	1101	1 (reference)
Remdesivir	14	475	4.06 (1.69–9.74)
45–64 years
Other drugs prescribed for COVID-19d	25	1087	1 (reference)
Remdesivir	34	843	4.75 (1.04–2.96)
≥65 years
Other drugs prescribed for COVID-19d	25	1022	1 (reference)
Remdesivir	40	1037	1.58 (0.95–2.62)
Sex groupsh
Female
Other drugs prescribed for COVID-19d	17	1381	1 (reference)
Remdesivir	39	930	3.41 (1.92–6.06)
Male
Other drugs prescribed for COVID-19d	40	1935	1 (reference)
Remdesivir	54	1519	4.75 (1.04–2.96)

ROR is a ratio similar in concept to the odds ratio in case–control studies and corresponds to the exposure odds among reported cases of bradycardia over the exposure odds among reported non-case.

Reports containing any terms including the terminology ‘Bradycardia’ or ‘Sinus Bradycardia’ found in MedDRA dictionary https://www.meddra.org.

All other adverse events.

Hydroxychloroquine, tocilizumab, lopinavir/ritonavir, dexamethasone, methylprednisolone.

Occurrence of death, a life-threatening adverse event, inpatient hospitalisation or prolongation of hospitalisation, significant disability, congenital anomaly.

Drugs used concurrently but not suspected by the reporter to have caused the adverse effect.

863 reports with missing age data.

659 reports with missing sex data.

Discussion

In this observational study including more than 6500 reports of COVID-19 patients, we found for the first time an association between remdesivir use and reports of bradycardia. Most of bradycardia reports with remdesivir were serious and some were fatal (17%). Our study suggests an increased risk of reporting bradycardia with remdesivir than other drugs. While such analysis could be subject to limitations as reporting bias, our results are in line with previous reports of cardiac events in remdesivir clinical trials [5]. This safety concern reminds us of two other cardiac safety signals with other RNA-dependent RNA-polymerase inhibitors. First, clinical development of the antiviral BMS986094 was discontinued after a phase II study due to serious cardiac events including heart rhythm disorders [8]. Second, in 2015, the FDA warned about serious bradycardia with hepatitis C treatments containing sofosbuvir [9]. The pharmacodynamic mechanism for bradycardia with remdesivir is still unknown. However, similarly to sofosbuvir, an effect on sinoatrial node function might be suggested [10]. Indeed, the active remdesivir metabolite is a nucleotide triphosphate derivative with similarity to ATP, known to slow sinoatrial node automaticity [1]. In the heart, ATP exerts negative chronotropic and dromotropic effects. The cardiac actions of ATP are mediated by adenosine its metabolite and by a vagal reflex triggered by ATP's stimulation of vagal sensory nerve terminals in the left ventricle [11]. Although this evidence is based on data from individual case safety reports, disproportionality analyses in pharmacovigilance databases remain important and provide reproducible information essential for early post-marketing surveillance [12,13]. These cardiac safety concerns should be particularly considered to limit the risk of cardiac adverse effects, particularly in the context of polypharmacy [14]. In addition, pharmacovigilance investigations are still necessary for cardiac risk with remdesivir, as a previous study reported the potential block of hERG (human ether-a-go-go gene) and prolongation of cardiac repolarization with remdesivir [15]. Post hoc analyses of trials and additional observational studies are needed to corroborate our findings. Given the increased use of remdesivir and recent FDA recommendations, physicians should be aware of this cardiac safety signal.

Transparency declaration

All authors have no relevant conflicts of interest to disclose. The work was performed during the university research time of the authors using the database which is available without fees in the department of the authors.

Author contributions

All authors conceived and designed the study. F.M. and A.T. acquired the data and did the statistical analyses. All authors analysed and interpreted the data. F.M. wrote the manuscript, and all authors critically revised the manuscript. F.M. supervised the study and is the guarantor. All authors approved the final version of the manuscript and are accountable for its accuracy.