Regenerative Therapy Prevents Heart Failure Progression in Dyssynchronous Nonischemic Narrow QRS Cardiomyopathy

Area of Science:

• Cardiology
• Regenerative Medicine
• Stem Cell Therapy

Background:

• Cardiac resynchronization therapy (CRT) is effective for heart failure (HF) with wide QRS-complex.
• Device-based CRT is unsuitable for HF patients without QRS prolongation.
• A regenerative cell-based approach is explored as an alternative for narrow QRS-complex HF.

Purpose of the Study:

• To investigate the efficacy of stem cell therapy in a HF model with narrow QRS-complex.
• To assess the impact of regenerative medicine on cardiac dyssynchrony and HF progression.
• To evaluate the potential for device-autonomous resynchronization.

Main Methods:

• A chronic transgenic model of stress-triggered dilated cardiomyopathy with provoked cardiac dyssynchrony was used.
• Stem cell intervention was administered early in the disease course, characterized by mechanical dyssynchrony and narrow QRS-complex.
• Effects on cardiac structure, function, proteome, and long-term outcomes were assessed.

Main Results:

• Stem cell therapy aborted progressive dyssynchronous HF and prevented QRS widening.
• Treated hearts exhibited coordinated ventricular contraction/relaxation, improved systolic/diastolic performance, halted left ventricular dilatation, limited hypertrophy, and reduced fibrosis.
• Reverse remodeling included a restored cardiomyopathic proteome and nullified adverse cardiac outcomes.
• Cell therapy improved exercise capacity and prolonged survivorship in the dyssynchrony-prone cohort.

Conclusions:

• Regenerative stem cell therapy demonstrated significant functional and structural benefits in narrow QRS HF.
• This approach offers a potential for device-autonomous resynchronization therapy in refractory HF.
• Stem cell intervention presents a novel therapeutic strategy for HF patients unresponsive to conventional CRT.