Low voltage is defined as peak-to-peak QRS amplitude of < 5 mm in the limb leads and/or < 10 mm in the precordial leads. Low voltage may be present in the following situations:
Massive myocardial damage/infarction
Infiltrative/restrictive diseases (such as amyloid cardiomyopathy)
Note: If the gain indicated at the left of the ECG is turned down accidentally, the voltage will be falsely low (pseudo-low voltage). The indicator should be set to 10 mm amplitude.
Low Voltage Example 1
Low Voltage Example 2
Low Voltage Example 3
Low Voltage Example 4