Extra Heart Sounds (S3 and S4) Fourth Heart Sound Gallop - anatomy Lesson Waveform Video play pause Maneuver:Supine Chestpiece Position:Mitral Chestpiece:Bell Table of Contents Introduction Third Heart Sound Gallop Fourth Heart Sound Gallop Third and Fourth Heart Sound Gallop Summation Gallop at 120 beats per minute Extra Heart Sounds (S3 and S4): Fourth Heart Sound Gallop