Echocardiography-guided Injection for Targeted and Reliable Intramyocardial Stem Cell Delivery in a Rat Model of...

Area of Science:

• Cardiovascular Research
• Regenerative Medicine
• Preclinical Models

Background:

• Echocardiography-guided intramyocardial injection (EGI) is a minimally invasive stem cell therapy delivery method.
• EGI is established in mice but challenging in rats due to anatomical difficulties in myocardial infarction (MI) models.
• Thinning of the left ventricular anterior wall (LVAW) in rat MI models increases risks of perforation and failed delivery with standard needles.

Purpose of the Study:

• To optimize EGI for safe and accurate intramyocardial delivery in rat MI models.
• To overcome challenges associated with thin LVAW in infarcted rat hearts.
• To enhance the translational relevance of preclinical cardiac stem cell research.

Main Methods:

• Developed a refined EGI protocol using 29 G Spinocan needles for rat MI models.
• Utilized standard transthoracic echocardiography for guidance.
• Focused on precise targeting of viable myocardium adjacent to infarct zones.

Main Results:

• The optimized protocol enables precise EGI delivery into thin myocardial tissue, irrespective of LVAW thickness.
• The 29 G needle minimizes cardiac damage and improves injection accuracy.
• The technique avoids thoracotomy, allowing for longitudinal studies in the same animal.

Conclusions:

• Refined EGI with smaller needles provides a safe, reproducible, and accurate method for cardiac stem cell delivery in rat MI models.
• This improved technique enhances the translational value of preclinical cardiac regeneration studies.
• Standardization of this EGI approach can benefit inter-laboratory research.