Heart and Lung Sounds Reference Guide Aortic Pulmonic Erb's Point Tricuspid Mitral Lungs First Heart Sound (Minimally Split) Auscultation Reference Signup Now. Unlock lessons and more. SignUp Patient Normal Speed play pause Patient Half Speed play pause Simulated Full Speed play pause Lesson For heart sounds listen to the synthetic sound while reviewing this lesson. On occasion the first heart sound can be made up of two separate sounds separated by a very small interval (20-30 milliseconds).The Mitral component (caused by closure of the Mitral valve) comes first and is louder than the Tricuspid component (caused by closure of the Tricuspid valve).A minimally split first heart sound is a normal variation of the first heart sound. The waveform(s) seen above are a chart of sound amplitude (loudness) on the vertical axis against time on the horizontal axis. Listening Tips A summary of the key aspects of this heart or lung sound. S1: Minimal splitting. Auscultation Method The recommended patient position is supine For this sound, use stethoscope's diaphragm The recommended auscultation position for the stethoscope is tricuspid Relevant Courses If you wish to review a complete mobile concerning First Heart Sound (Minimally Split) Auscultation Reference and related heart sounds, the modules(s) listed below may be useful. Each lesson includes text that explains the auscultatory sound and its clinical significance. The lesson also includes an audio track for playback. A waveform provides a great way to visualize the sounds. Finally, we also include an animation video. For heart sounds, the video illustrates heart muscle and valve movements along with blood flow. For lung sounds, the primary source of the sounds can be seen. Each module also includes a quiz. Normal Heart Sounds22 First Heart Sounds23 First Heart Sound (Minimally Split) Auscultation Reference