It should be noted that each patient's heart sound is unique in intensity and frequency, but specific pathologies do have features that distinguishes them from innocent murmurs or normal heart sounds. Sensi was trained to identify these features and classify them as either pathological (Class I) or innocent/normal (Class III).
Due to the relative location of each heart valve the sound intensity of the S1 and S2 sound pulses will differ for each recording location, as well as from patient to patient. A specific diagnosis can't be made on the sound intensity of the S1 and S2 sounds.
The relative energy distribution graph that is provided within Sensi is only an indication of the relative mid-range frequency sound energy within each of the segments. It only provides a relative indication of where a murmur could be located (systolic or diastolic).
The next image shows the mid-range energy distribution for a heart sound recorded from an athlete. Note the innocent early systolic murmur at the aortic recording. Although the S2 sound pulse's energy level will in most cases be larger than S1, no specific diagnosis can be made from the relative S1 and S2 intensities. The stethoscope orientation and patient size could influence this.
The next image indicates the mid-range energy distribution of a patient with a VSD recorded at the pulmonary location. Note the pan-systolic murmur and the absence of any murmur in the diastolic area.