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Systolic Murmurs
Innocent Murmur
Sounds
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This is an example of an innocent murmur.
This type of murmur is seen with non-cardiac conditions such as pregnancy, hyperthyroidism, exercise and anemia. When these are treated appropriately the systolic murmur disappears.
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 auscultated 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.
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The recommended auscultation position for the stethoscope is the
Pulmonic
position. For this sound, use stethoscope's
Bell/Diaphragm
.
The recommended patient position is
Supine
Phonocardiogram
This waveform plots sound amplitude on the vertical axis against time on the horizontal axis.
Heart Animation
Lessons
1
Innocent Murmur
2
Aortic Sclerosis (Musical Murmur)
3
Aortic Stenosis -Mild
4
Aortic Stenosis - Severe 2
5
Mitral Regurgitation
6
Mitral Valve Prolapse (Click with Late Systolic Murmur)
7
Hypertrophic Cardiomyopathy
Practice Drill
Listening Tips
A synopsis of important sound features and timing for this abnormality.
Systole:
Early, short duration murmur, increases with inspiration.
CaseID
36
CourseID
22
CourseCaseOrder
5
ID
21