Sign in or Join to use this module.

Fourth Heart Sound Plus First Heart Sound

Certain heart sound configurations mimic a split first heart sound. One of these conditions is a fourth sound gallop (S4) plus a first heart sound (S1). Since the S4 occurs just before the S1, it is easy to confuse a S4/S1 with a split S1. An S4 is lower frequency than an S1. To differentiate between a S4/S1 and a split S1, listen carefully to the frequency of the initial sound of the pair. If it is lower in frequency than the second sound, it is an S4. If the two sounds are the same, it is a split S1.

Auscultation Sounds

auscultation sound from lesson
waveform

Patient Recording

patient heart or lung sound
Fourth Heart Sound Plus First Heart Sound

Patient Recording - Half Speed

patient heart or lung sound
Fourth Heart Sound Plus First Heart Sound

Position

Patient position
The patient's position should be supine.

Listening Tips

Diastole:S4 present - a low-pitched sound

Waveform (Phonocardiogram)



Observe Cardiac Animation

Authors and Sources

Authors and Reviewers


Sources

Return to Reference Guide Index Page
Fourth Heart Sound Plus First Heart Sound | #42


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