Table 1.

Transoesophageal views for the assessment of ASD.

View	Position in the oesophagus	Multiplane angles	Anatomical features
Four chamber	Mid-oesophagus	0°, 15°, 30°	Relationship to the AV valves
			Posterior rims
			ASD diameter
Upper oesophageal short axis	Mid- to upper oesophagus	0°, 15°, 30°, 45°	SVC rim
			Right upper pulmonary vein
			Superior aortic rim
			Detection of sinus venosus defect
Mid-oesophageal aortic valve short axis	Mid-oesophagus	30°, 45°, 60°, 75°	Posterior and aortic rims
			PFO
			ASD diameter
Bicaval view	Mid-oesophagus	90°, 105°, 120°	IVC and SVC rims
			Anomalous pulmonary venous drainage
			ASD diameter
Long axis	Mid- to upper oesophagus	120°, 135°, 150°	Roof of the LA
			Left pulmonary veins

AV, atrioventricular; IVC, inferior vena cava; LA, left atrium; SVC, superior vena cava.