Low voltage QRS

An electrocardiographic finding in which the amplitude of the QRS complexes is abnormally small (<5 mm in all limb leads and/or <10 mm in all precordial leads), reflecting reduced ventricular depolarization voltage at the body surface. Possible factors are damping causes (pericardial/pleural effusion, obesity, hyper-inflated lungs in COPD, severe edema/myxedema from hypothyroidism) or myocardial causes (loss of viable tissue and scarring from a massive myocardial infarction, cardiac amyloidosis, sarcoidosis, constrictive pericarditis).