Contrôle de la perméabilité du sphincter oesophagien inférieur à l'aide de signaux sonores

An original method is described for graphic display of sounds araising from the cardia during the swallowing of saliva or water. Two dynamic microphones were placed on the skin of epigastric xyphoid area and simultaneously on the latero-cervical position. The following conditions must be filled: position of the subject (upright or lying), correct application of microphone with pressure (2 kPa), specially for the xyphoid situation. For graphic restitutions from magnetic signal, a time-recording paper was used, on line or off line, with an analogical device including Butterworth band active filter (optimal frequency range 0.8-1.2 kHz), amplifier and integrator (t = 2 s). Occurence of typical cardia sounds were 86-97 % for saliva and 95-100 % for water in two normal subjects for the evaluation of reproductibility (one man and one woman 35 and 47 years old respectively, n = 234 sequencies, interval 20 s). Using the distance between the upper and lower microphones, the esophageal time transit can be measured. ...