Injectable hydrogel electrodes as conduction highways to restore native pacing.

Area of Science:

• Biomedical Engineering
• Cardiology
• Regenerative Medicine

Background:

• Ventricular arrhythmias are a primary cause of sudden cardiac death, necessitating advanced treatment strategies.
• Current pacing methods lack the precision to address the complex pathophysiology of these arrhythmias.
• There is a critical need for innovative therapies that restore normal cardiac conduction.

Purpose of the Study:

• To design and evaluate an injectable hydrogel electrode for cardiac pacing.
• To assess the efficacy of this new modality in mimicking native cardiac conduction.
• To explore its potential in preventing lethal arrhythmias and enabling painless defibrillation.

Main Methods:

• Development of an injectable hydrogel electrode system.
• Deployment and testing in a preclinical pig model.
• Analysis using surface ECG and 3D electroanatomic mapping.
• Evaluation in an ablation model to assess activation wavefront dynamics.

Main Results:

• Successful cardiac capture and pacing were achieved with the hydrogel electrode.
• ECG analysis showed QRS morphology similar to native sinus rhythm, indicating capture of deep cardiac pathways.
• Electroanatomic mapping demonstrated earlier and more uniform myocardial activation compared to traditional pacing.
• The hydrogel electrode facilitated rapid activation of the mid-myocardium and endocardium.

Conclusions:

• The injectable hydrogel electrode represents a feasible and advanced pacing modality.
• This technology closely replicates native cardiac conduction, offering a potential solution for re-entrant arrhythmias.
• It holds promise for preventing sudden cardiac death and improving defibrillation efficacy.