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Implantable cardioverter-defibrillator linked with lower mortality in heart failure

ICD use in HF trial presented in a Hot Line Session today at ESC Congress 2019 together with WCC

Implantable Cardioverter \ Defibrillator
Heart Failure


Paris, France – 3 Sept 2019: Implantable cardioverter-defibrillator (ICD) use is associated with reduced short- and long-term mortality in patients with heart failure, according to late breaking research presented in a Hot Line Session today at ESC Congress 2019 together with the World Congress of Cardiology (1)  and published in Circulation(2).

Patients with heart failure are at increased risk of potentially lethal ventricular arrhythmias (heart rhythm disorders) and sudden cardiac death. ICDs are used to correct these arrhythmias and prevent sudden death.

ESC guidelines recommend an ICD for primary prevention in symptomatic patients with heart failure with reduced ejection fraction (HFrEF), provided they are expected to survive substantially longer than one year with good functional status.(3) It is called primary prevention because patients have not had a ventricular arrhythmia before.

Principal investigator Dr Benedikt Schrage of the Karolinska Institutet in Stockholm, Sweden said: “Most randomised trials on ICD use for primary prevention of sudden cardiac death in HFrEF enrolled patients more than 20 years ago. However, characteristics and management of HFrEF have substantially changed since then and it is not known whether ICD improves outcome on top of contemporary treatments. Furthermore, it is unclear whether ICD use is equally beneficial in subgroups such as both women and men or older and younger patients.”

This study investigated the association between ICD use and all-cause mortality in a contemporary HFrEF cohort with a focus on subgroups. The study population was compiled from patients in the Swedish Heart Failure Registry (SwedeHF) fulfilling ESC criteria for primary prevention ICD use. Propensity score matching was used to account for differences at baseline.

Of 16,702 eligible patients in SwedeHF, 1,599 (9.6%) had an ICD. Dr Schrage said: “Among patients from SwedeHF fulfilling ESC criteria for primary prevention ICD use, less than 10% had the device. ICD use in Sweden is known to be lower than in other European countries (e.g. Germany or Italy). This could be because most heart failure patients are seen by primary care physicians and geriatricians who could be less inclined to accept device therapy and have a higher perception of contraindications compared to cardiologists.”

The propensity matched population consisted of 1,296 ICD users and 1,296 patients without an ICD. The researchers found that ICD use was associated with a 26% relative reduction in the risk of all-cause mortality at one year and a 13% relative reduction in the risk of all-cause mortality at five years. The five-year absolute risk reduction with ICD use was 3.1% leading to 33 patients needing to be treated to prevent one death in five years. 

The short-term and long-term mortality benefit was consistent across subgroups, such as patients with or without ischaemic heart disease, males and females, patients under 75 and 75 and older, those enrolled earlier versus later in SwedeHF and thus receiving less or more contemporary treatment, and also for patients with or without cardiac resynchronisation therapy.

Dr Schrage said: “The study found that primary prevention ICD was associated with reduced short-term and long-term all-cause mortality in HFrEF overall and in several subgroups. Our findings support the current recommendations and call for better implementation of ICD use in clinical practice.”

ENDS

Notes to editor

Notes to editors

Authors: ESC Press Office 
Mobile: +33 (0) 7 8531 2036
Email: press@escardio.org

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The hashtag for ESC Congress 2019 together with the World Congress of Cardiology is #ESCCongress

Funding: This study received support from Boston Scientific and the EU/EFPIA Innovative Medicines Initiative 2 Joint Undertaking BigData@Heart grant [n° 116074].

Disclosures: Benedikt Schrage reports no conflict of interest in regard to this study.

References and notes

(1) ICD use in HF will be discussed during:

(2)The full paper will be available during Congress from press@escardio.org

(3) 2016 ESC Guidelines for the diagnosis and treatment of acute and chronic heart failure. Eur Heart J. 2016;37:2129–2200.

About ESC Congress

ESC Congress is the world’s largest gathering of cardiovascular professionals contributing to global awareness of the latest clinical trials and breakthrough discoveries. ESC Congress 2019 together with the World Congress of Cardiology takes place from 31 August to 4 September at the Expo Porte de Versailles in Paris, France. Explore the scientific programme.

About the European Society of Cardiology 

The European Society of Cardiology brings together health care professionals from more than 150 countries, working to advance cardiovascular medicine and help people lead longer, healthier lives.

This press release accompanies both a presentation and an ESC press conference at ESC Congress 2019 together with the World Congress of Cardiology. It does not necessarily reflect the opinion of the European Society of Cardiology.