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Low voltage


See brief interpretation of 12 lead EKG above

Low voltage is present when the amplitude of the QRS complex is less than 0.5 mV in each of the limb leads and less than 1 mV in each of the precordial leads. This corresponds to a QRS amplitude less than 5 mm and 10 mm respectively (when 10 mm/mV measure is used – this should appear from the EKG).

Low voltage is indicative of conditions where the electrical signal from the heart is attenuated either because of a heart condition in itself or because of conditions outside the heart. Possible reasons include:

  • Pericardial effusion
  • Constrictive pericarditis
  • Severe ischemic heart disease
  • Infiltrative disease, e.g. amyloidosis
  • Hypothyroidism
  • Pulmonary emphysema
  • Pleural effusion
  • Pneumothorax
  • Generalized edema

An echocardiography performed on the patient with the 12 lead EKG above revealed a pericardial effusion. Also the patient presented with generalized edema.

— Mathias

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