Low ECG voltage

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  • QRS < 5 mm in limb leads, or
  • QRS < 10 mm in chest leads


  • Low electrical power within the heart (e.g. hypothyroidism)
  • Poor electrical conduction within the heart (e.g. sarcoid or scar tissue)
  • Poor conduction of signal from the heart to the ECG lead (e.g. obesity, COPD, pericardial effusion)
    • Low voltage + tachycardia = pericardial effusion until proven otherwise

See Also