RESUMEN
A new high resolution digital signal averaging device was developed to record precordial late potentials. The subjects examined included 8 normals (including medical patients with normal cardiovascular status), and 21 patients with coronary artery disease (CAD) and myocarditis of probable viral origin. Late potentials were evident in 11 cases (CAD 8 cases and myocarditis in 3 cases). In 10 patients, multiple ventricular premature beats and in 3 others, attacks of ventricular tachycardia had been present. Sudden cardiac death occurred later in one patient. It was concluded that late potentials as recorded by this simple new device are predictive of ventricular arrhythmias--sometimes life threatening. As no triggering is necessary, both conventional and beat-to-beat signal averaging can be carried out and the presence of various arrhythmias is negligible.