Systolic Murmurs

Innocent Murmur

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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.

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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

Innocent Murmur
Aortic Sclerosis (Musical Murmur)
Aortic Stenosis -Mild
Aortic Stenosis - Severe 2
Mitral Regurgitation
Mitral Valve Prolapse (Click with Late Systolic Murmur)
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.

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