Sign in or Join to use this module.

Fourth and First Heart Sounds Lesson

Virtual Auscultation

patient torso with stethoscope chestpiece

patient position during auscultation
The patient's position is supine.

Lesson

A fourth sound gallop (S4) plus a first heart sound (S1) can mimic a split first heart sound. Since the S4 occurs just before the S1, it is easy to confuse a S4-S1 pair with a split S1.

Listen carefully to the frequency of the initial sound of the S4-S1 pair. If it is lower in frequency than the second sound, it is an S4. If the two sounds have a similar frequency, it is a split S1.

Waveform




Heart Sounds Video



Authors and Sources

Authors and Reviewers

Sources

An error has occurred. This application may no longer respond until reloaded. Reload 🗙