BioSignetics Corporation
                                                                    Digital Stethoscope Company                             

Phonocardiograph Monitor Case Studies

Phonocardiogram Examples  Showing Normal Heart and a Progression of the
Systolic Murmur of Aortic Stenosis

Software provides tools to display heart signal and to estimate its basic statistics
that are presented in the format of Intensity Score (%); Frequency Score
(mean Frequency and Mean Half-Bandwidth) and Time Duration Score (%).

 
                      S1   systole      S2           diastole     
Normal Heart Sound

                    S1 Murmur          S2          

Aortic Stenosis (Gradient=25 mm Hg)

 

                   S1 Mur   S2 
Aortic Stenosis (gradient = 70 mm Hg)

 
                   S1   Murmur         S2
Aortic Stenosis (gradient = 95 mm Hg)

With the increase in the gradient from 25 mm Hg to 95 mm Hg we
detect marked increase in Murmur Frequency (94 to 158 Hz)
matched by the increase in intensity from 85%  to 226 %.

Data was collected on different patients.

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Copyright: 2004-2008 BioSignetics Corporation
Last modified: 01/01/08