A site for medical students - Practical,Theory,Osce Notes

What is hammans sign?

  • It is a crunching, rhythmical sound heard over the precordium and is synchronous with the heart beat. 
  • This sign is found in pneumomediastinum (or mediastinal emphysema). 
  • The sound is best audible in left lateral position 
  • Always search for subcutaneous emphysema meticulously in the presence of hamans sign.