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Investigations are as follows:
- barium swallow - characteristic appearance with proximal dilatation and distal smooth tapering
- manometric tests - demonstrate the motility disorder
- oesophagoscopy - exclusion of carcinoma
A chest radiograph may reveal:
- widened mediastinum with possibly a fluid level behind the heart
- absence of a gastric air bubble
Manometric studies reveal a gastro-oesophageal sphincter that has a high resting tone and only partially relaxes. The tone does not fall to gastric fundal pressure.
Last reviewed 01/2018