Mnemonic: SSSS Stenotic lesion of Semilunar valve and Septal defect cause Systolic murmur. From this, you should also be able to remember that regurgitant lesions of semilunar valve causes Diastolic murmur. The stenotic lesions of atrio-ventricular valve causes diastolic murmur and regurgitant lesions cause systolic murmur. Causes of systolic murmur: … Continue reading Murmurs Made Easy