Physiologic Evaluation of Esophageal Function in Patients with Achalasia and Diffuse Esophageal Spasm

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Abstract
To evaluate function of the normal and pathologic esophageal body under more physiologic conditions than those utilized for traditional laboratory testing, manometry was performed before and during eating using a catheter assembly containing three peripheral transducers. Studies were evaluated from seven normal volunteers, 18 typical achalasia patients (eight before and 10 after esophagomyotomy), and eight patients with diffuse esophagcal spasm (DES) as characterized by frequent simultaneous and repetitive contractions. In the preprandial period, all had similar frequencies of esophagcal contractions, although there was a wide range. During eating, the frequency of contractions increased in all groups; however, the contraction frequency in unoperated achalasia patients, 12.7 ± 5.0 contractions/min, significantly exceeded the frequency in normal volunteers of 4.9 ± 1.3 contractions/min, p < 0.01. The frequency was lower in operated achalasia patients, 9.4 ± 6.5 contractions/min, but still exceeded that of normal volunteers, p < 0.01. Patients with DES also had more frequent contractions, 10.5 ± 9.7 contractions/ min, than did the normal volunteers, p < 0.01. The mean pressure of esophagcal contractions for both achalasia groups was similar and was significantly lower than for the normal volunteers. Pressure in the DES patients was intermediate. It is concluded that patients with achalasia have lower pressure but more frequent contractions than normal volunteers during eating, and this spasm-like activity may be a more important pathophysiologic factor in their dysphagia than previously recognized. Esophagomyotomy does decrease the frequency of these contractions. Frequency, but not pressure, of contractions differs from normal in patients with DES.