PREPARATION AND TECHNIQUES OF TRANS-NASAL ESOPHAGO-GASTRO-DUODENOSCOPY

Abstract

Recent advances of industrial technology have enabled us trans-nasal esohago-gastro-duodenoscopy(EGD)easily. Although the techniques of trans-nasal EGD are not difficult, akind of slight barrier exists in starting of trans-nasal EGD. The most important factors ofbarrier are examiner's negative feelings for nasal endoscopy and a lack of knowledge forpreparation. In preparation, we believe that the usage of a little amount of vasoconstrictor asnaphazoline sulphate and high concentration lidocaine, no use of lidocaine jelly or injectivemedicines, and bougienage with Nelaton tube if needed are important. With these appropriatepreparations almost all patients are acceptable for trans-nasal EGD with deep satisfaction.The endoscopes possible for trans-nasal insertion have the almost same abilities in diagnosis ofupper gastro-intestinal tract diseases as the standard tans-oral EGD scopes. More advances inendoscopic function, e.g. observation with magnification and/or enhancement of micro-vascularstructures, with or without more decreasing in size may be expected.