Diffuse esophageal spasm (DES) and achalasia share both clinical and manometric characteristics. Some reports support the notion of progression of DES to achalasia. However, there are currently no prospective data in support of this theory. To assess prospectively the rate of manometric progression of DES to achalasia. Manometry tracings of DES patients diagnosed between 1992 and 2003 were independently reviewed blindly and agreed on by two esophageal experts. Patients with DES who agreed to undergo repeat esophageal manometry constituted the study cohort. Follow- up manometry tracings were evaluated blindly and independently by the same two interpreters to determine the rate of manometric progression to achalasia. Predictors of manometric progression were assessed. A total of 32 patients were diagnosed with DES between 1992- 2003. Twelve patients (9M/3F;median age 62 years) agreed to participate and underwent second manometry (mean ± SD follow- up of 4.8± 3.4 years). Achalasia was diagnosed on follow- up manometry in one patient (8% ), seven (58% ) patients continued to have DES, three (25% ) had normal motility, and one (8% ) had nutcracker esophagus. There were no predictors of progression to achalasia based on the initial manometry parameters. A subgroup of DES patients with initial low esophageal body amplitude developed increase in esophageal simultaneous contractions on follow- up similar to the patient who evolved to achalasia. Following were the results. 1) Progression from DES to achalasia is uncommon. 2)DES patients with low esophageal body amplitude may develop increased simultaneous contractions over time. 3) DES remains an elusive diagnosis clinically and manometrically.
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