Heart and Lung Sounds Reference Guide Aortic Pulmonic Erb's Point Tricuspid Mitral Lungs Atrial Septal Defect Auscultation Reference 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. This is an auscultation example of an atrial septal defect as heard at the pulmonic position.Atrial Septal Defect is a congenital condition associated with abnormal blood flow between the left atrium and the right atrium. Before birth there is a large connection between right and left atria. During development of the fetus the connection gradually disappears. However, in some cases the opening persists and is known as an atrial septal defect.Both the first and second heart sounds are split. The second heart sound splitting is fixed at 80 milliseconds.There is a brief diamond shaped murmur in early systole and another brief diamond shaped murmur in early diastoleIn the anatomy tab you see an enlarged right atrium and right ventricle. You see turbulent blood flow across the tricuspid valve between the right atrium and the right ventricle (the diastolic murmur). This is caused by blood flow from the left atrium into the right atrium through the atrial septal defect. There is further turbulent flow into the pulmonary artery causing the systolic murmur. 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. Systole: Diamond shaped, brief, early murmur.S2: Fixed splitting. Diastole: Diamond shaped, brief, early murmur. Auscultation Method The recommended patient position is supine For this sound, use stethoscope's diaphragm The recommended auscultation position for the stethoscope is pulmonic Relevant Courses If you wish to review a complete mobile concerning Atrial Septal Defect 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. Congenital Abnormalities29 Introduction to Clinical Electrophysiology and the ECG311 Atrial Septal Defect Auscultation Reference