Defining the gap in heart failure treatment in patients with cardiac implantable electronic devices.

BACKGROUND

The use of guideline-directed medical therapy (GDMT) is poorly described in patients with heart failure and reduced ejection fraction (HFrEF) with cardiac resynchronization therapy (CRT) and/or implantable cardioverter defibrillators (ICDs).

OBJECTIVE

To define the eligibility, uptake, dose, contraindications, and barriers to uptake of contemporary medical therapy in this population.

METHODS

Retrospective analysis of consecutive adults with ICD and/or CRT attending two Canadian tertiary centre device clinics between 1 March and 31 May 2021.

RESULTS

From 1005 device clinic consultations, 227 (22.6%) patients with HFrEF and CRT and/or ICD were included. GDMT eligibility was high: beta-blockers (99.6%), mineralocorticoid receptor antagonists (MRA) (89.0%), angiotensin receptor-neprilysin inhibitors (ARNI) (84.6%), and sodium-glucose cotransporter-2 inhibitors (SGLT2I) (87.7%). Contraindications were rare: beta-blockers (0.4%), MRA (11.0%), ARNI (15.4%), and SGLT2I (12.3%). Uptake of GDMT was high for beta-blockers (97.4%) but low for other medications: MRA (63.0%), ARNI (46.7%), SGLT2I (22.9%). Except for SGLT2I (84.6%) and beta-blockers (57.9%), less than one-half of patients were prescribed target-doses of MRA (10.5%), and ARNI (47.7%). Of the visits, GDMT was already optimal in 16%, electrophysiologists acted in 33% (21% prescribed, 7% ordered investigations, 5% referred to heart function services), and in the remaining visits, optimization was either deferred to another cardiologist (20%) or no plan was mentioned (25%), besides other reasons (4%).

CONCLUSION

Despite broad eligibility for GDMT in patients with HFrEF and ICD/CRT, significant gaps in prescription and titration exist. Our results highlight the need to embed quality assurance initiatives in cardiac device clinics to improve HFrEF care.