Synchronized Diaphragmatic Stimulation for Heart Failure With a Reduced Left Ventricular Ejection Fraction Using the...

Area of Science:

• Cardiology
• Biomedical Engineering
• Medical Devices

Background:

• Synchronized diaphragmatic stimulation (SDS) modulates intrathoracic pressures to improve cardiac function in heart failure with reduced ejection fraction (HFrEF).
• This study evaluated the safety and 1-year effectiveness of SDS in an expanded patient cohort using various implantation techniques.

Purpose of the Study:

• To assess the safety and efficacy of SDS in symptomatic HFrEF patients receiving guideline-directed therapy.
• To evaluate outcomes including adverse events, quality of life, echocardiography, and exercise capacity over 12 months.

Main Methods:

• Nineteen male HFrEF patients were enrolled and underwent SDS implantation using three different surgical approaches.
• Patients were monitored for adverse events and assessed for quality of life (SF-36 QOL), 6-minute hall walk distance, and echocardiographic parameters at 3, 6, and 12 months.

Main Results:

• All three implantation techniques were successful (100%) with no procedure- or SDS-related adverse events.
• Significant improvements were observed in 6-minute hall walk distance (p=0.002) and SF-36 QOL physical (p=0.004) and emotional (p=0.001) scales.
• Left ventricular end-systolic volume decreased (p=0.04), while N-terminal pro B-type natriuretic peptide and left ventricular ejection fraction showed non-significant trends toward improvement.

Conclusions:

• SDS can be safely delivered using alternative implantation methods in HFrEF patients.
• The study suggests potential for improved patient outcomes over one year of follow-up.
• Larger, randomized trials are warranted to confirm these preliminary findings.