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In this procedure, a surgeon makes an incision on the left breast to expose the heart. Then, using a laser, the surgeon drills a series of holes from the outside of the heart into the heart's pumping chamber.
How does it work?
How transmyocardial revascularization (TMR) reduces angina still isn't fully understood.
The laser may stimulate new blood vessels to grow, called angiogenesis (an"je-o-JEN'eh-sis).
It may destroy nerve fibers to the heart, making patients unable to feel their chest pain.