#septal_defect  a congenital abnormality in the septum between the left and right sides of the heart
  supertype:  #congenital_heart_defect  a birth defect involving the heart
  subtype:  #atrial_septal_defect  an abnormal opening between the left and right atria of the heart
  subtype:  #ventricular_septal_defect  a common congenital heart defect; an abnormal opening in the septum dividing the ventricles allows blood to pass directly from the left to the right ventricle; large openings may cause congestive heart failure

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