- Esophageal findings consistent with ineffective esophageal motility (IEM), defined as per the Chicago Classification as ≥50% ineffective swallows. Ineffective swallows include both failed swallows, defined by an average distal contractile integral (DCI) <100mmHg*cm*sec, and weak swallows, defined by an average DCI >100 but <450mmHg*cm*sec