Ventricular arrhythmia in heart failure patients with reduced ejection fraction and central sleep apnoea

Christoph Fisser, Jannis Bureck, Lara Gall, Victoria Vaas, Jörg Priefert, Sabine Fredersdorf, Florian Zeman, Dominik Linz, Holger Wöhrle, Renaud Tamisier, Helmut Teschler, Martin R. Cowie, Michael Arzt
ERJ Open Research 2021 7: 00147-2021; DOI: 10.1183/23120541.00147-2021

Abstract

Cheyne–Stokes respiration (CSR) may trigger ventricular arrhythmia in patients with heart failure with reduced ejection fraction (HFrEF) and central sleep apnoea (CSA). This study determined the prevalence and predictors of a high nocturnal ventricular arrhythmia burden in patients with HFrEF and CSA (with and without CSR) and to evaluate the temporal association between CSR and the ventricular arrhythmia burden.

 This cross-sectional ancillary analysis included 239 participants from the SERVE-HF major sub-study who had HFrEF and CSA, and nocturnal ECG from polysomnography. CSR was stratified in ≥20% and <20% of total recording time (TRT). High burden of ventricular arrhythmia was defined as >30 premature ventricular complexes (PVCs) per hour of TRT. A sub-analysis was performed to evaluate the temporal association between CSR and ventricular arrhythmias in sleep stage N2.

 High ventricular arrhythmia burden was observed in 44% of patients. In multivariate logistic regression analysis, male sex, lower systolic blood pressure, non-use of antiarrhythmic medication and CSR ≥20% were significantly associated with PVCs >30·h−1 (OR 5.49, 95% CI 1.51–19.91, p=0.010; OR 0.98, 95% CI 0.97–1.00, p=0.017; OR 5.02, 95% CI 1.51–19.91, p=0.001; and OR 2.22, 95% CI 1.22–4.05, p=0.009; respectively). PVCs occurred more frequently during sleep phases with versus without CSR (median (interquartile range): 64.6 (24.8–145.7) versus 34.6 (4.8–75.2)·h−1 N2 sleep; p=0.006).

 Further mechanistic studies and arrhythmia analysis of major randomised trials evaluating the effect of treating CSR on ventricular arrhythmia burden and arrhythmia-related outcomes are warranted to understand how these data match with the results of the parent SERVE-HF study.

Abstract

High ventricular arrhythmia burden occurs in 44% of heart failure patients with reduced ejection fraction and central sleep apnoea. Arrhythmia burden is higher in sleep phases with versus without Cheyne–Stokes respiration. https://bit.ly/2QBDamC

Introduction

Patients with heart failure are at increased risk of sudden cardiac death and ventricular arrhythmia [1]. In addition, a high burden of ventricular arrhythmia (>30 premature ventricular complexes (PVCs) per hour) and a very high burden of ventricular arrhythmia (PVCs >4% of total beats or >10 000 PVCs/24 h) have been linked to the occurrence of higher grade ventricular arrhythmias (e.g. (non-)sustained ventricular tachycardias) [1], impaired left ventricular systolic function [2–4] and higher mortality [4–7].

Approximately 50% of patients with heart failure and reduced left ventricular ejection fraction (HFrEF) present with moderate to severe sleep-disordered breathing (SDB) [8]. Of those, about 50% have predominant obstructive sleep apnoea (OSA), 50% have predominant central sleep apnoea (CSA) and 41% show periods with a Cheyne–Stokes respiration (CSR) breathing pattern, irrespective of the type of SDB [9].

Pathophysiologically, heart failure can induce and worsen CSA via pulmonary congestion, hyperventilation and ventilatory control instability [10]. Additionally, CSA, and in particular CSR, may also contribute to the progression of heart failure [11]. Small studies showed that just a small proportion of patients with HFrEF and concomitant OSA have a high burden of ventricular arrhythmia [12, 13]. The association between CSA (and CSR) and PVCs in HFrEF populations remains unclear [12–15].

The aims of this study were to determine the prevalence of a high or a very high burden of nocturnal ventricular arrhythmia in patients with HFrEF and CSA (with and without CSR), to identify predictors and risk factors for such arrhythmia and, finally, to evaluate the temporal association between CSR and ventricular arrhythmia.

Methods

Study design

A cross-sectional ancillary analysis of data from participants with HFrEF and CSA in the SERVE-HF major sub-study (NCT00733343) was performed. The temporal association between CSR with ventricular arrhythmias in sleep stage N2 was performed in a subset of these patients.

Study population

Of 91 centres participating in SERVE-HF, seven contributed patients to the ancillary analysis of the major sub-study [16]. Participants in the sub-study were a subgroup of those enrolled in the SERVE-HF trial. Inclusion and exclusion criteria of the SERVE-HF major sub-study have been previously reported in detail [11, 16]. Briefly, patients were aged ≥22 years and had symptomatic chronic heart failure (New York Heart Association (NYHA) class III or IV, or class II with ≥1 heart failure-related hospitalisation in the previous 24 months) and reduced left ventricular ejection fraction (LVEF ≤45%) [16]. All received stable, contemporary guideline-based medical treatment for heart failure [16]. Use of antiarrhythmic drugs (chiefly amiodarone) was at the discretion of the investigators. With respect to SDB, individuals had predominant CSA [16]. Study exclusion criteria were amyloidosis, hypertrophic cardiomyopathy and diuretic dosage more than doubled within the 4 weeks prior to randomisation [16]. Additional exclusion criteria for this sub-analysis of the SERVE-HF major sub-study were insufficient ECG data (e.g. technical interference) and unclear rhythm or no consensus in expert round ( supplementary table S1).

The sub-study protocol was approved by the appropriate local or regional ethics committee [16]. The trial was conducted according to Good Clinical Practice and the Principles of the Declaration of Helsinki 2002. All participants gave written informed consent.

CSA and Cheyne–Stokes respiration

Sub-study evaluations such as demographics or polysomnography (PSG) were performed at the baseline visit [16]. CSA was defined as an apnoea–hypopnoea index (AHI) >15·h−1 with ≥50% central events and a central AHI ≥10·h−1, derived from PSG and based on total recording time (TRT), documented within 4 weeks of randomisation, with flow measurement performed using a nasal cannula [11]. All PSGs were centrally scored in a blinded fashion (HP2 Sleep CoreLab, Alpes University, Grenoble, France) by two scorers according to American Academy of Sleep Medicine (AASM) rules [17], with additional scoring by a third senior scorer if there were any discrepancies. CSR was defined as ≥3 episodes of continuous cycles of waxing and waning tidal volumes with periods of hyperventilation separated by apnoea/hypopnoeas and visually quantified by the percentage of the recording time: ≥20% and <20% (including those with no CSR) [11].

ECG measurements – cardiac arrhythmias

ECG data were derived from full overnight PSG. The nocturnal 1-lead-Holter ECG was monitored from a single precordial lead with sampling frequency of 250 Hz. This frequency is acceptable for analysis of ventricular and supraventricular arrhythmias [18]. A single centre study with 167 patients suggested that PVC burden is similar in the morning (clock time 06:00–13:59), the afternoon (14:00–21:59) and at night-time (22:00–05:59) [19] in patients with HFrEF and SDB. Thus, nocturnal PVC burden assessed from nocturnal ECG is likely to provide a representative estimate of the total (24-h) PVC burden.

Data sets were visually analysed by two trained investigators (LG, JB) according to standard definitions [20], with low interobserver variability for PVCs comparable with previous important analyses of nocturnal ECGs in cohorts with PSG [18, 21] (intraclass correlation coefficients (95% confidence interval) for a random sample of 20 sleep studies: 0.90 (0.75–0.96), p<0.001; further details in the online supplementary material). Investigators were blinded with respect to clinical data and only had access to the ECG channel and the pre-scored PSG sleep stages. High and very high burden of ventricular arrhythmia was defined as PVCs>30·h−1 and >4% PVCs of total beats or >10 000 PVCs/24 h, respectively [2–7] (see online supplementary material for more details). In addition, a subset analysis (n=19, supplementary figure S1) was performed to analyse the occurrence of PVCs·h−1 in sleep stage N2 in episodes with and without CSR [15, 22] (see online supplementary material for more details).

Study outcomes

The end-points in this analysis were the prevalence of high and very high burden of nocturnal ventricular arrhythmia at baseline, the identification of predictors of ventricular arrhythmia, and the temporal relationship between CSR and high ventricular arrhythmia burden.

Statistical analysis

Categorical data are presented as frequency in percentage and compared using the Chi-square test. Normally distributed quantitative data are expressed as mean±standard deviation, and non-normal data as median and interquartile range (IQR). Comparisons between quantitative variables were done with either unpaired t-test or Mann–Whitney U-test. Dependent, non-normally distributed, variables were compared using Wilcoxon signed-rank test. Univariate linear regression models were performed to assess the association between high ventricular arrhythmia burden and demographics/cardiac risk factors. A multivariate logistic regression model, including all independent variables with p<0.1 in the univariate model, was calculated. All p-values are two-sided, and p=0.05 was considered the threshold for statistical significance. Intraclass correlation (ICC) estimates and their 95% confidence intervals were calculated based on a mean-rating (k=2), absolute-agreement and 2-way mixed-effects model. Data entry and calculation were performed with the software package SPSS 26.0 (Chicago, IL, USA).

Results

Patients

Of the 312 participants in the SERVE-HF major sub-study, 239 had ECGs that fulfilled technical requirements (supplementary figure S1). Participants were primarily males (91%), with a mean age of 69 years and an average ejection fraction of 33% (table 1), similar to the parent SERVE-HF trial population [12]. The most common heart failure aetiology was ischaemic (57%), and 60% had a cardiac implantable electronic device (table 1). Fourteen per cent of patients were documented as being on an antiarrhythmic drug (excluding β-blockers, which were documented separately), primarily amiodarone. The subgroup of patients with a high burden of ventricular arrhythmia (PVCs >30·h−1) were more likely to be male versus those with fewer ventricular arrhythmias (PVCs ≤30·h−1); patients with PVCs >30·h−1 also had lower systolic blood pressure and were less likely to be using antiarrhythmics (table 1).

View this table:
TABLE 1

Ancillary analysis of the major SERVE-HF sub-study: baseline characteristics

Respiratory and sleep characteristics

Study patients had a median AHI of 37·h−1 with predominant CSA (cAHI/AHI 81%). Severity and type of sleep apnoea were similar in patients with PVCs >30·h−1 or ≤30·h−1 (supplementary table S2). Oxygen saturation, time with oxygen saturation <90% and Epworth Sleepiness Scale scores were similar between groups. The proportion of sleep spent in slow-wave sleep or rapid eye movement sleep was low in both the PVCs >30·h−1 and ≤30·h−1 groups (supplementary table S2).

Prevalence of high burden of ventricular arrhythmia in patients with HFrEF and CSA

The average number of PVCs was 25·h−1. The proportion of patients with PVCs >30·h−1, >4% of total beats and >10 000/24 h was 44%, 13% and 7%, respectively. Nocturnal heart rate was similar in the groups with PVCs >30·h−1 and ≤30·h−1 (table 2). In addition to the absolute number of PVCs/night, the proportions with >4% PVCs/total beats and >10 000 PVCs/24 h, and non-sustained ventricular tachycardia (NSVT), were higher in patients with PVCs >30·h−1 versus ≤30·h−1 (table 2).

View this table:
TABLE 2

ECG data from nocturnal Holter ECG

Predictors and risk factors for high burden of ventricular arrhythmia

In univariate analysis, male sex, low systolic blood pressure, haemoglobin, non-use of antiarrhythmics and CSR ≥20% were associated with PVCs >30·h−1 (table 3). All of these variables but haemoglobin remained significantly associated with PVCs >30·h−1 in the adjusted multivariate analysis (table 3). Patients with CSR ≥20% had significantly more PVCs/h than those with a CSR proportion <20% group (figure 1a), and PVCs >30·h−1 was more prevalent in the CSR≥20% group (figure 1b).

View this table:
TABLE 3

Univariate and multivariate logistic regression models analysing the association of preselected variables with premature ventricular complexes >30·h−1

FIGURE 1
FIGURE 1

a) Boxplot showing premature ventricular complexes (PVCs) per hour in patients with Cheyne–Stokes respiration (CSR) ≥20% (n=161) versus <20% (n=78). Data are expressed as median, minimum, maximum, 25th percentile and 75th percentile on a logarithmic scale. b) Prevalence of frequent premature ventricular complexes (>30 h−1) in patients with CSR ≥20% versus <20%. Data are expressed as percentage.

High burden of ventricular arrhythmia in sleep phases with CSR

A subset of patients (n=19; supplementary figure S1) was eligible for analysis of PVCs/h during sleep stage N2 in phases with versus without CSR [15, 22]. Baseline data for this subset are presented in supplementary table S3. In total, 54.5 h of sleep stage N2 were analysed. The cumulative length of episodes with and without CSR were 26.1 and 28.4 h, respectively. PVCs/h occurred more frequently during episodes with versus without CSR (figure 2). Figure 3 represents a typical PSG recording showing the occurrence of PVCs in phases of no CSR versus CSR.

FIGURE 2
FIGURE 2

Boxplot showing premature ventricular complexes per hour in sleep stage N2 in episodes with (26.1 h) versus without Cheyne–Stokes respiration (CSR, 28.4 h). Data are expressed as median, minimum, maximum, 25th percentile and 75th percentile on a logarithmic scale. Individual data on premature ventricular complexes (PVCs) for the 19 included patients are also shown, 15 of whom showed a higher number of PVCs per hour in periods with versus without CSR.

FIGURE 3
FIGURE 3

Comparison of premature ventricular complexes (PVCs) in phases with and without Cheyne–Stokes respiration (CSR) during sleep (representative polysomnographic recording). The ratio of PVC in phases with and without CSR was 2:1. a) Nasal airflow: typical triggering of CSR in patients with heart failure with reduced ejection fraction by relative hyperventilation [40] marked in blue. The pink line represents a phase of CSR. b) Electrocardiogram (PVCs marked in orange). c) Effort thorax. d) Effort abdomen.

Discussion

This study provides novel insights into the association between high burden of ventricular arrhythmia and CSA in patients with HFrEF. The prevalence of high burden of ventricular arrhythmia (PVCs >30·h−1) in patients with HFrEF and CSA was 44%. Factors associated with higher rates of PVCs >30·h−1 in multivariate logistic regression analysis were male sex, low systolic blood pressure, non-use of antiarrhythmics and CSR ≥20%. In addition, high rates of PVC were significantly more frequent in sleep phases with CSR.

Despite the fact that ventricular arrhythmias are common in up to 97% of patients with HFrEF [23], and that CSA and CSR may trigger ventricular arrhythmias due to their inherent pathophysiology [15, 18], data on the burden of ventricular arrhythmias in HFrEF patients with CSA from larger studies are scarce. Lanfranchi et al. [14] studied patients with LVEF ≤40% and AHI≥15·h−1. In 17 patients with severe CSA (AHI 43·h−1) and LVEF 27% the rate of nocturnal PVCs was 95·h−1. In contrast, data from another study in comparable patients (CSA with AHI 41·h−1 and LVEF 30%) reported a lower rate of PVCs (34·h−1) [19]. Both studies used 24-h Holter ECG for analysis [14, 19]. In contrast, in the current multicentre analysis, ECG and respiratory data were recorded the same night and an even lower PVC burden was recorded (25·h−1). However, nearly half of all patients had a rate of PVCs ≥30·h−1, while 13% had PVCs >4% of total beats and 7% showed >10 000 PVCs/24 h. This finding is noteworthy because the risk of sudden cardiac death in the general population with high or very high burden of ventricular arrhythmia is increased by 2.6-fold versus those with a lower ventricular arrhythmia burden [4–7].

Comparable studies in this distinctive HFrEF population with CSA and high or very high ventricular arrhythmia burden have not been performed yet. Studies evaluating different cohorts such as SDB patients undergoing cardiac surgery [24] or without cardiac disease [25] reported much lower rates of high ventricular arrhythmia burden of 19% and 3%, respectively.

Factors such as male sex, low blood pressure, non-use of antiarrhythmics and CSR ≥20% were significantly associated with high burden of ventricular arrhythmias in patients with HFrEF and CSA in our study. Other known risk factors such as age and ejection fraction were not associated with high burden of ventricular arrhythmias [1], possibly due to the pre-selection of patients with HFrEF. Similar to our results, others reported strong associations between male sex [26], low systolic blood pressure [27] and non-use of antiarrhythmics [1] and a high burden of ventricular arrhythmias.

We found that CSR ≥20% was associated with a high burden of ventricular arrhythmia. CSR ≥20% remained an independent risk factor after adjusting for potential confounders such as sex, systolic blood pressure and use of antiarrhythmic drugs.

When analysing episodes with and without CSR using 19 patients as their own controls [15, 22], and therefore eliminating potential confounders, we found that the burden of PVCs/h was 86% higher during periods of CSR. Leung et al. [15] has previously reported a doubling of PVC burden in nine patients with HFrEF and CSA in phases with versus without CSR. The absolute burden of PVCs/h in Leung et al. [15] was ∼two-fold higher than in our study. Four of the nine patients had no analysable phases without CSR. In these patients, regular breathing was artificially induced by CO2 inhalation, which was associated with a significant reduction in PVCs [15].

Key mechanisms of how CSA may induce a high burden of ventricular arrhythmia in HFrEF include activation of the sympathetic nervous system, left ventricular wall stress and hypoxia [28]. In addition, the large tidal volumes generated during the hyperpnoeic phase of CSR–CSA are indicative of intense respiratory drive [15]. Since activation of brainstem respiratory neurons can coactivate adjacent central sympathetic neurons in animal preparations [15, 29], surges in respiratory drive during the hyperpnoeic phase of CSR–CSA in humans could stimulate phase-linked bursts of central sympathetic outflow [15].

Moreover, CSRs induce mechanical myocardial distension [30] and may increase heart rate [31].

Long-term, exposure to CSA and CSR can contribute to chronic structural ventricular remodelling processes, increasing PVC susceptibility; furthermore, acutely, transient changes in ventricular electrophysiology and haemodynamics may directly trigger PVCs during specific CSA episodes [32].

However, the evidence for arrhythmogenic mechanisms related to CSA and CSR is not completely clear. In a pig model of sleep apnoea, mainly simulated obstructive, but not central apnoeas, resulted in transient changes in ventricular repolarisation, potentially increasing arrhythmia risk [33]. Additionally, it has been proposed that CSR may be, at least partially, protective in patients with HFrEF [34]. Potential protective mechanism of CSR includes increased end-expiratory lung volume followed by better oxygenation, respiratory alkalosis and hypocapnia, leading to favourable effects on heart muscle viability during hypoxia and better myocardial oxygen delivery [34]. Moreover, in a mathematical model, periodic muscular load followed by recovery, resembling CSR, has been shown to be favourable compared with continuous work to compensate for pre-existing hypoxia [35].

Irrespective of CSR, a high burden of ventricular arrhythmia has been reported to be associated with higher grade ventricular arrhythmias and mortality [4, 6, 7]. In HFrEF patients, those with CSR have been reported to have higher mortality compared to those without CSR [36, 37], and there is a dose–response relationship between CSR and mortality rate [37]. The observed association between CSR and high ventricular arrhythmia burden as well as the temporal relationship between sleep phases with CSR and increased PVC burden suggests, but does not prove, a causal relationship between CSR and ventricular arrhythmias, and a may be considered a potential mechanism for increased mortality in HFrEF patients with CSR.

Despite this, abolition of CSA with adaptive servo-ventilation (ASV) therapy in HFrEF patients in the parent randomised trial (SERVE-HF) was associated with a 34% increase in cardiovascular mortality [11], largely driven by an increase in deaths without a preceding hospitalisation and therefore most likely sudden cardiac deaths [38]. Interestingly, a post hoc analysis of the SERVE-HF study showed that patients with CSR≥20% were more likely to experience a primary end-point event (all-cause death or life-saving cardiovascular intervention plus unplanned hospitalisation for worsening chronic heart failure) when randomised to ASV versus the control group, while the risk of an end-point event in those with CSR <20% was lower in the ASV group versus control [11].

Thus, our finding of an association between CSR and ventricular arrhythmia burden in HFrEF patients with CSA could be interpreted that HFrEF with CSR have a higher susceptibility for ventricular arrhythmias, without direct causality. Alternatively, CSR may contribute to trigger ventricular arrhythmias, which has to be confirmed in mechanistic clinical studies or interventional trials with longer simultaneous rhythm and sleep apnoea monitoring.

The results from this sub-analysis must be interpreted in the light of several limitations. A direct causal relationship cannot be inferred due to the cross-sectional study design. In this study, only nocturnal PVC burden could be analysed. A 24-h Holter ECG was not available, and we did not have systematic collection of data from the cardiac implantable electronic devices in the parent or this sub-study. The association between CSR and rare higher grade ventricular arrhythmias such as NSVT could not be adequately addressed due to limited statistical power. However, consistent with existing literature, data indicate that a high burden of ventricular arrhythmia is associated with higher grade ventricular arrhythmias [1]. Thus, high ventricular arrhythmia burden should be a legitimate surrogate for higher grade ventricular arrhythmias. Specific antiarrhythmic drugs were not assessed in this analysis, although the majority were taking amiodarone in our population [38]. Intrathoracic pressures, tidal volumes and markers of autonomic dysfunction were not assessed. Sleeping position, which may have an effect on the number and nature (obstructive/central) of apnoeas and hypopnoeas, was not systematically assessed.

A strength of the current study is that PSG and ECG data were obtained on the same night, in contrast to other publications [14, 19, 24]. Therefore, possible confounders such as time-related effects should be minimal.

In conclusion, 44% of patients with HFrEF and CSA had a high burden of ventricular arrhythmia, and this was more likely in males, those with CSR ≥20% of the recording time, when systolic blood pressure was lower and in the absence of antiarrhythmic medication. Ventricular arrhythmia burden was higher during sleep with CSR than without CSR. Further mechanistic studies and arrhythmia analysis of major randomised trials (e.g. SERVE-HF [11] or ADVENT-HF [39]) evaluating the effect of treating CSR on ventricular arrhythmia burden and arrhythmia-related outcomes are warranted to understand how these data match with the results of the parent SERVE-HF study [11].

Supplementary material

Supplementary Material

Please note: supplementary material is not edited by the Editorial Office, and is uploaded as it has been supplied by the author.

Supplementary material 00147-2021.supplement

Acknowledgements

Medical writing assistance was provided by Nicola Ryan, independent medical writer, funded by ResMed. The authors thank the CRI (Clinical Research Institute) for their expertise in overseeing the SERVE-HF trial.

Footnotes

  • This article has supplementary material available from openres.ersjournals.com

  • Author contributions: C. Fisser and M. Arzt were responsible for conceiving and designing the study and its hypotheses, acquiring study funding, collecting, analysing and interpreting the data, and writing and revising the manuscript prior to submission. C. Fisser, J. Bureck and L. Gall were involved in the collection, analysis and interpretation of data, and were responsible for drafting and revising the manuscript prior to submission. V. Vaas, J. Priefert, S. Fredersdorf, F. Zeman, D. Linz, H. Woehrle, R. Tamisier, M.R. Cowie and H. Teschler were involved in the collection and interpretation of data and critical revision of the manuscript prior to submission. F. Zeman was involved in data analysis and critical revision of the manuscript prior to submission.

  • Conflict of interest: C. Fisser reports grants from the German Heart Foundation/German Foundation of Heart Research during the conduct of the study.

  • Conflict of interest: J. Bureck has nothing to disclose.

  • Conflict of interest: L. Gall has nothing to disclose.

  • Conflict of interest: V. Vaas reports grants from the German Society of Sleep Medicine outside the submitted work.

  • Conflict of interest: J. Priefert has nothing to disclose.

  • Conflict of interest: S. Fredersdorf has nothing to disclose.

  • Conflict of interest: F. Zeman has nothing to disclose.

  • Conflict of interest: D. Linz reports personal fees from Bayer, LivaNova, ResMed and Respicardia outside the submitted work.

  • Conflict of interest: H. Wöhrle is a former employee of ResMed.

  • Conflict of interest: R. Tamisier reports grants from ResMed and personal fees from Agiradom, outside the submitted work.

  • Conflict of interest: H. Teschler reports grants and personal fees from ResMed outside the submitted work.

  • Conflict of interest: M.R. Cowie reports grants and personal fees from ResMed, personal fees from Respicardia, and grants from Bayer, outside the submitted work.

  • Conflict of interest: M. Arzt reports grants from ResMed during the conduct of the study; and personal fees from ResMed, grants and personal fees from Philips Respironics, personal fees from Boehringer Ingelheim, NRI, Novartis, JAZZ Pharmaceuticals, Inspire and Bresotec, and grants from the Else-Kroehner Fresenius Foundation, outside the submitted work.

  • Support statement: The SERVE-HF study was supported by ResMed and by grants from the National Institute for Health Research (NIHR) Cardiovascular and Respiratory Biomedical Research Units (MRC). Representatives and scientists from the ResMed participated in the study including design, data collation, data analysis and critical review of the paper. This ancillary analysis was supported by ResMed (M. Arzt) and by a grant from the German Heart Foundation/German Foundation of Heart Research (F/15/20; C. Fisser). Funding information for this article has been deposited with the Crossref Funder Registry.

  • Received March 5, 2021.
  • Accepted May 18, 2021.
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Ventricular arrhythmia in heart failure patients with reduced ejection fraction and central sleep apnoea
Christoph Fisser, Jannis Bureck, Lara Gall, Victoria Vaas, Jörg Priefert, Sabine Fredersdorf, Florian Zeman, Dominik Linz, Holger Wöhrle, Renaud Tamisier, Helmut Teschler, Martin R. Cowie, Michael Arzt
ERJ Open Research Jul 2021, 7 (3) 00147-2021; DOI: 10.1183/23120541.00147-2021
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