Intraluminal manometry is a useful clinical and investigative method for the evaluation of esophageal motor function. If improperly performed, however, the examination yields only semiquantitative information. Notwithstanding, instrumentation and methods are now available that permit accurate quantitation of esophageal pressure activity.
Esophageal pressure values are determined by several important factors: recording-system fidelity, recording technique, scoring method, and conditions existent during manometry.1 All these factors must be considered and dealt with satisfactorily, in order to obtain precise esophageal pressure measurements. The purpose of this paper is to provide useful practical information relative to the performance and interpretation of clinical esophageal manometry.
RECORDING ACCURACY
Two major variables determine the recording fidelity of any pressure recording system: (1) character of the pressure event being recorded, and (2) recording-system performance.2 For esophageal pressure waves, recording fidelity is inversely related to wave amplitude (Amp) and directly related to wave duration (Dur). On infusion