Intracoronary stem-cell injection after myocardial infarction: microcirculation sub-study.

Area of Science:

• Cardiology
• Regenerative Medicine
• Cell Therapy

Background:

• Acute myocardial infarction (AMI) treatment often involves stem cell injections.
• Intra-arterial coronary (IAC) delivery is the predominant method, while intravenous coronary (IVC) delivery is an alternative route.
• Comparing these delivery methods is crucial for optimizing cell therapy efficacy.

Purpose of the Study:

• To compare cell distribution and retention patterns between anterograde (IAC) and retrograde (IVC) delivery routes.
• To assess the impact of microvascular obstruction on cell retention using cardiac MRI.
• To evaluate the safety and feasibility of both delivery approaches in AMI patients.

Main Methods:

• A prospective, randomized study involving 30 AMI patients with successful reperfusion.
• 100 million bone marrow mononuclear cells (BMMC) were injected via IAC or IVC routes.
• Cells were labeled with 99mTc-HMPAO for distribution assessment; cardiac MRI evaluated microvascular obstruction.

Main Results:

• Both IAC and IVC routes were feasible and safe, with no serious adverse events.
• Higher early and late retention of labeled cells was observed in the IAC group compared to the IVC group.
• Cell retention was superior with the anterograde approach, irrespective of microcirculation obstruction.

Conclusions:

• Retrograde IVC delivery of BMMC is a feasible and safe alternative route for AMI.
• Anterograde IAC delivery demonstrates superior cell retention in cardiac tissue.
• Further research is warranted to validate these findings and explore clinical implications.