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Effects of Photobiomodulation in mRNA Expression of Extracellular Matrix Components of Cardiac Fibrosis in Experimental Post‐infarcted Myocardial in Rats

Myocardial infarction (MI) is due to irreversible cell death (necrosis) of the heart muscle, secondary to a prolonged inhibition of oxygen supply (ischemia). Fibrosis is the major histologic marker, resulting in heart failure from myocardial infarction. Recently, low intensity laser (LBI) has become an alternative therapy to modulate various biological processes and depending on the wavelength, dosage and condition of the irradiated tissue, has anti‐inflammatory effect, reduces pain and speeds up cell proliferation.