Innocent systolic murmur.
This type of murmur is seen in non-cardiac conditions such as pregnancy, hyperthyroidism, exercise and anemia. When treated properly the murmurs disappear.
The murmur is heard in early systole, is of short duration and has a frequency range of 120 hz to 250 hz. It is best heard in the pulmonic area and increases in intensity with inspiration. It can be heard with either the bell or diaphragm.
In this example S1 and S2 are normal. Diastole is silent.
The short duration and mid-range frequency characterize an innocent murmur.
Because heart auscultations are low frequency sounds, it is best to have a sound system with good bass to fully appreciate the sample.