Management Approach for Low Voltage on ECG

Definition and Clinical Significance

The American Heart Association suggests that low voltage on ECG is a significant finding that requires further investigation, as it may indicate several serious underlying conditions, including cardiac amyloidosis and pericardial effusion 1, 2, 3

Cardiac amyloidosis is a common cause of low voltage on ECG, seen in approximately 25% of ATTR amyloidosis and 50% of AL amyloidosis, according to the American College of Cardiology 2, 3
The European Society of Cardiology notes that non-cardiac causes of low voltage on ECG include emphysema 5 and hypothyroidism 3

The American College of Cardiology recommends a thorough diagnostic evaluation, including a complete 12-lead ECG to confirm low voltage and identify other abnormalities, as well as comparison with previous ECGs when available 1, 4, 5, 6
The initial assessment should include a review of the patient's history for symptoms such as syncope, dyspnea, chest pain, fatigue, or edema, as well as an assessment for risk factors of cardiac disease and family history of sudden cardiac death 6, 7
Echocardiography is essential to evaluate ventricular wall thickness, presence of pericardial effusion, left ventricular function, and chamber size, according to the American Heart Association 2, 3

The American College of Cardiology recommends that management should be directed at the underlying cause, including referral to cardiology for specialized management of cardiac amyloidosis 2, 3
For patients with dilated cardiomyopathy, standard heart failure management is recommended, according to the American Heart Association 1

The American College of Cardiology suggests that follow-up echocardiography is necessary to assess response to treatment, and continued surveillance for progression of underlying disease is crucial 3, 7
Serial ECGs to monitor for changes in voltage are also recommended, although the frequency and duration of monitoring are not specified 3