[Methods for measuring the motor activity of the esophagus and gastroesophageal reflux]

The contractile activity of the oesophageal body and of the upper and lower oesophageal sphincter (LOS) can reliably be portrayed by means of low compliance recording systems, either pneumohydraulic or with strain gauge force transducers, and at least two pressure sensors. LOS resting pressure can be assessed by both station and rapid pull-through techniques, or by the sleeve method. States of disordered LOS function, such as achalasia, can be diagnosed dependably only by manometric means. Manometry is of high diagnostic yield for motor disorders of the oesophageal body as well, although generally accepted diagnostic criteria are still lacking. In patients with angina-like chest pain, provocation tests can prove that oesophageal contraction abnormalities cause the symptoms. Edrophonium has been shown to be the most effective and best tolerated provocative agent. Transport of swallowed material through the oesophagus can reliably be recorded by radionuclide transit studies. Such studies are valuable in identifying patients with absent or impaired peristalsis and in evaluating treatment effects, e. g., the effects of mechanic dilatation in achalasia. Gastrooesophageal reflux should be recorded not only qualitatively but also quantitatively, although a definition of what is pathological and what is not has not been generally agreed upon. Recording of oesophageal intraluminal pH over longer periods of time, preferably 24 h, may have the best diagnostic yield. The advent of computer-aided analysis techniques will replace the cumbersome handscoring of motor and pH tracings and, hopefully, contribute to a better understanding and classification of oesophageal pathophysiology.