Fourth Heart Sound Gallop Auscultation Reference

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heart lung sounds waveform synthetic

Lesson

For heart sounds listen to the synthetic sound while reviewing this lesson.

The fourth heart sound occurs in late diastole just prior to the first heart sound.

The first heart sound is decreased in intensity and the second heart sound is increased in intensity.

The fourth heart sound is produced by an increase in stiffness of the left ventricle due to scar tissue formation. This may be a manifestation of coronary heart disease.

A fourth heart sound can also be caused by a greatly thickened left ventricular wall such as with essential hypertension or aortic stenosis. This is shown in the anatomy tab.

A fourth heart sound is never heard with atrial fibrillation because the contraction of the atria is ineffective in this condition.

The fourth heart sound is a low frequency sound best heard with the bell of the stethoscope pressed lightly on the skin of the chest.

The waveform(s) seen above are a chart of sound amplitude (loudness) on the vertical axis against time on the horizontal axis.


Listening Tips

A summary of the key aspects of this heart or lung sound.
S1: Reduced intensity.
S2: Increased intensity.
Diastole: S4 present - a low pitched sound.

Auscultation Method

maneuver
The recommended patient position is supine
torso
For this sound, use stethoscope's bell The recommended auscultation position for the stethoscope is mitral



Relevant Courses

If you wish to review a complete mobile concerning Fourth Heart Sound Gallop Auscultation Reference and related heart sounds, the modules(s) listed below may be useful. Each lesson includes text that explains the auscultatory sound and its clinical significance. The lesson also includes an audio track for playback. A waveform provides a great way to visualize the sounds. Finally, we also include an animation video. For heart sounds, the video illustrates heart muscle and valve movements along with blood flow. For lung sounds, the primary source of the sounds can be seen. Each module also includes a quiz.

Fourth Heart Sound Gallop Auscultation Reference







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