Profile: Cambridge Heart Inc. focuses on the research, development and commercialization of products for the non-invasive diagnosis of cardiac disease. Our diagnostic product, microvolt T-wave alternan is an extremely subtle beat-to-beat fluctuation in the T-wave segment of a patient's heartbeat. The use of our products and technology in the performance of a Microvolt T-Wave Alternans test can detect these tiny heartbeat variations, measured down to one millionth of a volt.