This site is intended for healthcare professionals

Sign in
Go to /sign-in page

You can view 5 more pages before signing in

Heart sounds (first, soft)

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

Authoring team

Possible causes of a soft first heart sound include:

  • early atrioventricular closure (in this situation the leaflets are semi-closed at the end of diastole)
    • a low flow at the end of diastole
    • a P-R interval that is greater than 0.2 s
  • a rigid calcified valve will cause a soft first heart sound
  • if the left ventricle is not contracting efficiently then there may be a soft first heart sound produced
  • a delayed onset of left ventricular systole

Hence, causes include:

  • mitral regurgitation
  • low blood pressure, for example with M.I.
  • rheumatic carditis
  • severe heart failure
  • left bundle branch block

Related pages

Create an account to add page annotations

Create a free account

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.

The content herein is provided for informational purposes and does not replace the need to apply professional clinical judgement when diagnosing or treating any medical condition. A licensed medical practitioner should be consulted for diagnosis and treatment of any and all medical conditions.

Connect

Copyright 2024 Oxbridge Solutions Limited, a subsidiary of OmniaMed Communications Limited. All rights reserved. Any distribution or duplication of the information contained herein is strictly prohibited. Oxbridge Solutions receives funding from advertising but maintains editorial independence.