Systolic heart murmurs are heart murmurs heard during systole. They can be classified by when the murmur begins and ends, between S1 and S2. Many involve stenosis of the semilunar valves or regurgitation of the atrioventricular valves. ==Types== ==Individual murmurs== ===Mid-systolic ejection=== === Late systolic === ===Holosystolic (pansystolic) ...