title: Ultrasonic B-scanning of the heart with an ECG gated television display.
mesh_terms: D003626:Data Display; D004562:Electrocardiography / Q000295:instrumentation*; D006321:Heart; D006352:Heart Ventricles; D006801:Humans; D008943:Mitral Valve; D013690:Television; D014465:Ultrasonics / Q000295:instrumentation; D014463:Ultrasonography