Previous massive MI
Acute pulmonary embolism
· Above ECG depicts low voltage QRS complexes.
· The QRS is said to be low voltage when:
The amplitudes of all the QRS complexes in the limb leads are < 5 mm; or
The amplitudes of all the QRS complexes in the precordial leads are < 10 mm
Low voltage is produced by :
-The “damping” effect of increased layers of fluid, fat, or air between the heart and the recording electrode.
-Loss of viable myocardium.
-Diffuse infiltration or myxoedematous involvement of the heart.
Fluid: Pericardial effusion; Pleural effusion
Infiltrative / Connective Tissue Disorders
Infiltrative myocardial diseases — i.e.restrictive cardiomyopathy due to amyloidosis, sarcoidosis, hemochromatosis, Constrictive Pericarditis, Scleroderma
Loss of viable myocardium: Previous massive MI; End-stage dilated cardiomyopathy