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1. Type
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1.1 Simple pre-tricuspid shunts
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1.1.1 Atrial septal defect (ASD)
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1.1.1.1 Ostium secundum
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1.1.1.2 Sinus venosus
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1.1.1.3 Ostium primum
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1.1.2 Total or partial unobstructed anomalous pulmonary venous return
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1.2 Simple post-tricuspid shunts
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1.2.1 Ventricular septal defect (VSD)
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1.2.2 Patent ductus arteriosus
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1.3 Combined shunts
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Describe combination and define predominant defect
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1.4 Complex congenital heart disease
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1.4.1 Complete atrioventricular septal defect
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1.4.2 Truncus arteriosus
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1.4.3 Single ventricle physiology with unobstructed pulmonary blood flow
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1.4.4 Transposition of the great arteries with VSD (without pulmonary stenosis) and/or patent ductus arteriosus
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1.4.5 Other
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2. Dimension (specify for each defect if more than one congenital heart defect exists)
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2.1 Haemodynamic (specify ratio of pulmonary and systemic blood flow, Qp:Qs)
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2.1.1 Restrictive (pressure gradient across the defect)
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2.1.2 Non-restrictive
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2.2 Anatomic
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2.2.1 Small to moderate (ASD ≤2.0 cm and VSD ≤1.0 cm)
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2.2.2 Large (ASD > 2.0 cm and VSD > 1.0 cm)
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3. Direction of shunt
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3.1 Predominantly systemic-to-pulmonary
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3.2 Predominantly pulmonary-to-systemic
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3.3 Bidirectional
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4. Associated cardiac and extracardiac abnormalities
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5. Repair status
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5.1 Unoperated
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5.2 Palliated [specify type of operation(s), age at surgery]
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5.3 Repaired [specify type of operation(s), age at surgery]
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