S1 S2 Lub Dub -

Here is the piece put together:

🔊

Muffled sounds, extra sounds (S3, S4), or irregular rhythms always warrant a closer look. s1 s2 lub dub

Palpate the carotid pulse while listening. S1 occurs just before the pulse; S2 occurs just after. Here is the piece put together: 🔊 Muffled