Fourth Heart Sound Plus First Heart Sound | Auscultation #18 | Lesson with Audio

patient thorax when auscultating by stethoscope

patient position during auscultation
The patient was supine during auscultation.

Description

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.

Phonocardiogram

Anatomy

Fourth Heart Sound Plus First Heart Sound


Authors and Sources

Authors and Reviewers

Sources


? v:3 | onAr:0 | onPs:2 | tLb:0 | pv:1
uStat: False | db:0 | cc: | tar: False
| cDbLookup # 0



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