Systolic murmur

A cardiac auscultatory sound due to turbulent blood flow that begins during or just after the first heart sound and terminates before or during the second heart sound, occurring in ventricular systole and commonly associated with valvular stenosis or regurgitation. Possible causes are physiologic factors (anemia, fever, infection, pregnancy, hyperthyroidism) and structural disorders (aortic Stenosis, mitral regurgitation, tricuspid regurgitation, ventricular septal defect, mitral valve prolapse, hypertrophic cardiomyopathy).