Eisenberg et al listed criteria for low voltage in a 12 lead electrocardiogram (ECG). The authors are from the University of California at San Francisco.


Amplitude of the QRS Complex

limb leads

< 5 mm in all 6 leads (I, II, III, aVF, aVR, aVL)

precordial leads

< 10 mm in all 6 leads (V1, V2, V3, V4, V5, V6)



• 1 mm = 0.1 mV. 5 mm = 0.5 mV. 10 mm = 1.0 mV.

• Wagner defines low voltage in the limb leads as amplitude < 7 mm.


Low voltage may be:

(1) in limb leads alone

(2) in precordial leads alone

(3) in both the limb and precordial leads


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