Auscultation in Primary Care Mitral Stenosis (Diastolic Murmur) Lesson Waveform Anatomy play pause Table of Contents 1First and Second Heart Sounds - Normal and Unsplit 2First and Second Heart Sounds - Reduced Intensity 3Second Heart Sound - Splitting 4Third Heart Sound Gallop 5Fourth Heart Sound Gallop 6Third and Fourth Heart Sound Gallop 7Summation Gallop at 120 beats per minute 8Second Heart Sound - Fixed Splitting 9Mid-Systolic Click 10Mitral Valve Leaflet Prolapse 11Aortic Stenosis (Diamond Shaped Systolic Murmur) 12Aortic Regurgitation (Decrescendo Diastolic Murmur) 13Mitral Regurgitation (pansystolic Murmur) 14Mitral Stenosis (Diastolic Murmur) Practice Quiz This video is an animation of Mitral Stenosis (Diastolic Murmur) A#31 (lesson# 14) within course number 14. This is an example of a diastolic decrescendo murmur occurring after an opening snap. It is associated with mitral stenosis.The first heart sound is increased in intensity while the second heart sound is normal. An opening snap is present after the second heart sound. The low pitched rumbling murmur starts after the opening snap and lasts until mid diastole.On the anatomy tab you can see an enlarged left atrium and thickened but mobile mitral leaflets.Turbulent blood flow from the left atrium into the left ventricle is responsible for the murmur.