2Tonnesen H, Puggaard L, Braagaard J, et al. Stress response to endoscopy. Scand J Gastroenterol, 1999,34:629-631.
3Johnson DA, Cattau EL Jr, Khan A, et al. Fiberoptic esophagogastroscopy via nasal intubation. Gastrointest Endosc, 1987, 33:32-33.
4Fregonese D, Di Falco G. Through-the-nose gastroscopy. Am J Gast roenterol, 1991,86 : 381.
5Fregonese D, Di Falco G. Through the nose gastroscopy for the placement of feeding tubes. Endoscopy,1993,25:539-541.
6Leisser A, Delpre G, Kadish U. Through the nose with gastroscope. Gastrointest Endosc, 1990,36:77.
7Gopal DV, Zaman A, Katon RM. A role for transnasal esopha- gogastroduodenoscopy in patients intolerant to the oral route: report of two cases. Gastrointest Endosc, 1999,49:379-381.
9Akihiro M,Nobutoshi F,Takayuki A, et al. Cardiovascular tolerance in unsedated upper gastrointestinal endoscopy: prospective randomized comparison between transnasal and conventional oral procedures. Digestive Endoscopy ,2006,18:282-287.
10Yagi J, Adachi K,Afima N,et al. A prospective randomized comparative study on the safety and tolerability of transnasal esophagogastrod uodenoscopy. Endoscopy, 2005,37 : 1226 -1231.