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Heartsounds in mitral regurgitation

What are the causes of soft S1 in mitral regurgitation
  • It is due to the incomplete opposition of valve cusps
  • There is partial closure of mitral valve orifice at the onset of ventricular systoli
Causes of loud S1 in MR
  • Co-existing mitral stenosis
  • MVP – MR
  • MR due to papillary muscle dysfunction
What are the causes of left ventricular S3 in MR
  • It is due to elevated left ventricular end diastolic volume (LVEDV)
  • Due to left ventricular dysfunction – LV dysfunction