See brief interpretation of 12 lead EKG above
– sinus tachycardia, rate 120
– low voltage in limb leads (QRS < 0.5 mV) and precordial leads (QRS < 1 mV)
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
- Pulmonary emphysema
- Pleural effusion
- 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.