Minimum criteria for the diagnosis of diffuse oesophageal spasm based on a 24 hour manometry study
| (1) Duration of “spasm” contraction greater than 15 seconds | |
| (2) Maximum amplitude of “spasm” contractions greater than 200 mm Hg | |
| (3) “Spasm” contractions should involve greater than 10 cm of oesophageal body | |
| (4) Symptoms (which should occur with some of the contractions) of chest pain and/or dysphagia should occur during or within 30 seconds of the contraction ending |