This site is intended for healthcare professionals

Go to /sign-in page

You can view 5 more pages before signing in

Variable first (1st) heart sound

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

Authoring team

If the blood flow from atria to ventricles varies from one beat to the next, then the intensity of the first heart sound will change accordingly.

Causes include:

  • varying duration of diastole
  • complete atrioventricular block

Related pages

Create an account to add page annotations

Annotations allow you to add information to this page that would be handy to have on hand during a consultation. E.g. a website or number. This information will always show when you visit this page.