MTWA Testing

The Microvolt T-Wave Alternans™ (MTWA) Test is a non-invasive diagnostic test that uses special electrodes that are placed on the chest and attached to a computer to examine how the electrical system of your heart operates. MTWA testing measures very small voltage changes between your heartbeats. These alterations in the beats are called alternans and the presence of alternans have been associated with an increased likelihood of life threatening ventricular arrhythmias or abnormal heartbeats.

Most of the time, these T-wave variations are not visible to the naked eye when a routine ECG or stress test is performed. The Microvolt T-Wave Alternans test permits measurement of the T-waves at a microvolt level (one millionth of a volt), allowing your doctor to evaluate variations of the T-Wave that may have otherwise been missed without use of this specialized test.

Extensive clinical studies have demonstrated that a normal or negative MTWA test indicates a very low risk of sudden cardiac arrest.