Back to Pegasus definition listing Choose a year from the dropdown to view that year's definition 2009 2011 2009 Structural heart surgery Date: July 2009 Definition: The undergoing of surgery requiring median sternotomy (surgery to divide the breastbone) on the advice of a Consultant Cardiologist, to correct any structural abnormality of the heart. Definition update history: Structural heart surgery May 2011 Structural heart surgery July 2009 Share this by email Back to Pegasus definition listing