An injection administered directly into the heart muscle.

Why this matters

Used in stem cell therapy for heart failure and cardiac repair after heart attacks.

LINK: https://www.sciencedirect.com/science/article/abs/pii/S0142961219303886#:~:text=Intramyocardial%20hydrogel%20injections%20attenuate%20LV,15%5D%2C%20%5B16%5D%5D.