Transmyocardial Revascularization (TMR) is a laser surgery that facilitates
the growth of blood vessels, resulting in decreased chest pain due to
inadequate oxygen supply reaching the heart muscle. TMR is usually performed
in conjunction with bypass surgery (CABG) on individuals with blood deprived
heart muscle. The surgeon may create 20-40 new channels, each 1 millimeter
wide, in the muscular wall of the left ventricle using a laser. These
new channels stimulate angiogenesis, which is the natural growth of new
blood vessels within the heart muscle.
The surgery is performed in the cardiac surgery suite under general anesthesia
and usually takes one to two hours to perform if this is the sole procedure
being done. It may only take minutes if being performed as part of a Coronary
Artery Bypass Graft (CABG) procedure.