Ineffective esophageal motility (IEM) is a heterogeneous disorder, considered minor by the Chicago classification, as it is not consistently associated with symptoms. It has recently been proposed to analyze this entity using 3 parameters: severely compromised motility (above 70% ineffective waves), multiple rapid swallows (MRS) and its distalcontractile integral (DCI) compared to single swallow (SS), could reveal functional reserve (MRS:SS DCI>1).