Causes of low voltage QRS complexes

Adrenal insufficiency

Anasarca

Artifactual or spurious, eg, unrecognized standardization of ECG at one-half the usual gain (ie, 5 mm/mV)

Cardiac infiltration or replacement (eg, amyloidosis, tumor)

Cardiac transplantation, especially with acute or chronic rejection

Cardiomyopathy, idiopathic or secondary*

Chronic obstructive pulmonary disease

Constrictive pericarditis

Hypothyroidism, usually with sinus bradycardia

Left pneumothorax (mid-left chest leads)

Myocardial infarction, extensive

Myocarditis, acute or chronic

Normal variant

Obesity

Pericardial effusion

Pericardial tamponade, usually with sinus tachycardia

Pleural effusions

Causes_of_low_QRS_voltage.htm

* Dilated cardiomyopathy may be associated with the combination of relatively low limb lead voltages and prominent precordial voltages.

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