Innocent Still's Murmur in A Child 
S1 S.Mur S2 S3 S1 S.Mur S2 S3
Diamond shaped systolic murmur follows S1. S3 follows S2.
Two consecutive heart beats are shown.
S1 Sys.mur S2 S3
Single Heart Beat
Systolic Murmur Frequency Spectrum - very narrow ("musical")
indicative of Still's murmur
Systolic Murmur (our main interest here) has Intensity 24.85%,
Duration 56%; Frequency Score-1 (mean frequency) = 100 Hz
and Frequency Score-2 (half-bandwidth) = 8.07 Hz. Also this
is Grade 2 murmur. Narrow half-bandwidth confirms that this
is musical innocent Still's murmur.
S1 Mur Sp.S2 S3
Energy Signature for a given heart beat.
S2 split is evident showing A2 and P2 as 2 peaks on the power
plot and two spots of energy on the energy signature. 
S1 Mur S2 S3
Instantaneous frequency for murmur (energy density spectrum)
and power at murmur frequency (100 HZ).
CONCLUSIONS: Diamond shaped Grade 2 low intensity (24%) systolic murmur
is immediately visible on the Phonocardiogram and Energy Signature
spectrogram. S2 spit is visible. Murmur intensity score (low) and
frequency score (narrow) confirms that this is innocent Still's murmur. Heart Sound was taken from the Ears On Auscultation Program
and Database, www.corsonics.com (D.L. Roy, MD; B. Holt) 
S1 murmur S2 S3
Innocent Still's murmur shown with superimposed EKG tracing. Note how beginning of S1 matches QRS and end of T-wave matches
beginning of S2. Heart Sound was recorded by Meditron Analyzer (Welch-Allyn)
(R. Geggel, MD) | 
BioSignetics Corporation