Time-frequency analysis of systolic murmurs

Many pathological conditions produce systolic murmurs which may or may not be audible during auscultation. The significance of murmurs during auscultation generally alert the examiner for further investigations such as Doppler test, ultrasonic imaging or even cardiac catheterisation. This approach, however has not proved efficient. An alterative approach is to acquire heart sound data directly into computer memory using various suitable interface circuits. The systolic period can be isolated and time-frequency analysis can be applied. Analysis show some interesting results which may, or may not, be related to the severity of aortic stenosis