Reflux patterns following limited myotomy without fundoplication for achalasia.

Five patients with achalasia underwent limited myotomy without fundoplication. Surgery reduced mean lower esophageal sphincter resting pressure significantly (p less than .05) from 31 +/- 9.7 mm Hg to 16.1 +/- 8.2 mm Hg. Twenty-four-hour ambulatory esophageal pH studies demonstrated that the percentage of time the pH in the distal esophagus was below 4 was similar whether the patient was upright or supine (6.6 +/- 6.5% of total time upright vs. 9.1 +/- 12.7% of total time). Reflux events that occur in the supine position may be significant because of their prolonged duration resulting from the absence of normal secondary peristalsis in the body of the esophagus. Patients with achalasia who have undergone esophagomyotomy without fundoplication do not appear to experience more reflux than control subjects with normal esophageal function.