Is manometric definition of the LES mandatory for accurate positioning of the pH probe in the distal esophagus?
G.J. Wiener (Chula Vista) 

What are the technical details of clinical relevance in pH-metry? What are the advantages and disadvantages of antimony electrodes?
G.A. Cargill (Paris), J.P. Vergnet (Ecully) 

Does the diameter of glass electrodes imply restriction in clinical use?
G.A. Cargill (Paris), J.P. Vergnet (Ecully) 

Are ion sensitive field effect transistor pH electrodes useful for prolonged ambulatory pH monitoring?
D. Armstrong (Hamilton), P. Duroux, C. Emde, A.L. Blum (Lausanne) 

Is there any rationale for evaluating the number of episodes or percentage of time with esophageal pH lower than 7?
V. Bresadola, G. Zaninotto, M. Anselmino, M. Costantini (Padova) 

How should the optimally discriminating pH values be determined?
G.J. Wiener (Chula Vista) 

What is the reproducibility of 24-hour recording of esophageal pH?
J.E. Richter (Cleveland) 

What is the value of ambulatory gamma detection of GER using local gamma-ray monitoring?
N. Washington (Nottingham) 

What are the indications for pH monitoring in pediatrics?
Y. Vandenplas (Brussels)