Figure 1

Innocent vibratory murmur in a 7-year-old. On auscultation, the typical early and midsystolic low-vibrating murmur is best heard at the left fourth intercostal space and the apex (S1 = First heart sound, S2 = Second heart sound, SM = Systolic Murmur). The phonogram shows a rising and falling early-to-midsystolic murmur, and the spectrogram shows a typical dense configuration and a descending frequency with a maximum gradient of approx. 150 Hz. The auscultation area was the left fourth intercostal space (LIC4). Duration 56%, peak frequency 149 Hz and volume 32%.