title: Clinical impact of endoscopy position detecting unit (UPD-3) for a non-sedated colonoscopy.
abstract: OBJECTIVE
  To evaluate whether an endoscopy position detecting unit (UPD-3) can improve cecal intubation rates, cecal intubation times and visual analog scale (VAS) pain scores, regardless of the colonoscopist's level of experience.
  
  
  METHODS
  A total of 260 patients (170 men and 90 women) who underwent a colonoscopy were divided into the UPD-3-guided group or the conventional group (no UPD-3 guidance). Colonoscopies were performed by experts (experience of more than 1000 colonoscopies) or trainees (experience of less than 100 colonoscopies). Cecal intubation rates, cecal intubation times, insertion methods (straight insertion: shortening the colonic fold through the bending technique; roping insertion: right turn shortening technique) and patient discomfort were assessed. Patient discomfort during the endoscope insertion was scored by the VAS that was divided into 6 degrees of pain.
  
  
  RESULTS
  The cecum intubation rates, cecal intubation times, number of cecal intubations that were performed in < 15 min and insertion methods were not significantly different between the conventional group and the UPD-3-guided group. The number of patients who experienced pain during the insertion was markedly less in the UPD-3-guided group than in the conventional group. Univariate and multivariate analysis showed that the following factors were associated with lower VAS pain scores during endoscope insertion: insertion method (straight insertion) and UPD-3 guidance in the trainee group. For the experts group, univariate analysis showed that only the insertion method (straight insertion) was associated with lower VAS pain scores.
  
  
  CONCLUSIONS
  Although UPD-3 guidance did not shorten intubation times, it resulted in less patient pain during endoscope insertion compared with conventional endoscopy for the procedures performed by trainees.
authors.affiliation: Masakatsu Fukuzawa, Junichi Uematsu, Shin Kono, Sho Suzuki, Takemasa Sato, Naoko Yagi, Yuichiro Tsuji, Kenji Yagi, Chika Kusano, Takuji Gotoda, Fuminori Moriyasu, Department of Gastroenterology and Hepatology, Tokyo Medical University, Tokyo 160-0023, Japan.
authors.forename: Masakatsu
authors.initials: M
authors.lastname: Fukuzawa
authors.affiliation: Masakatsu Fukuzawa, Junichi Uematsu, Shin Kono, Sho Suzuki, Takemasa Sato, Naoko Yagi, Yuichiro Tsuji, Kenji Yagi, Chika Kusano, Takuji Gotoda, Fuminori Moriyasu, Department of Gastroenterology and Hepatology, Tokyo Medical University, Tokyo 160-0023, Japan.
authors.forename: Junichi
authors.initials: J
authors.lastname: Uematsu
authors.affiliation: Masakatsu Fukuzawa, Junichi Uematsu, Shin Kono, Sho Suzuki, Takemasa Sato, Naoko Yagi, Yuichiro Tsuji, Kenji Yagi, Chika Kusano, Takuji Gotoda, Fuminori Moriyasu, Department of Gastroenterology and Hepatology, Tokyo Medical University, Tokyo 160-0023, Japan.
authors.forename: Shin
authors.initials: S
authors.lastname: Kono
authors.affiliation: Masakatsu Fukuzawa, Junichi Uematsu, Shin Kono, Sho Suzuki, Takemasa Sato, Naoko Yagi, Yuichiro Tsuji, Kenji Yagi, Chika Kusano, Takuji Gotoda, Fuminori Moriyasu, Department of Gastroenterology and Hepatology, Tokyo Medical University, Tokyo 160-0023, Japan.
authors.forename: Sho
authors.initials: S
authors.lastname: Suzuki
authors.affiliation: Masakatsu Fukuzawa, Junichi Uematsu, Shin Kono, Sho Suzuki, Takemasa Sato, Naoko Yagi, Yuichiro Tsuji, Kenji Yagi, Chika Kusano, Takuji Gotoda, Fuminori Moriyasu, Department of Gastroenterology and Hepatology, Tokyo Medical University, Tokyo 160-0023, Japan.
authors.forename: Takemasa
authors.initials: T
authors.lastname: Sato
authors.affiliation: Masakatsu Fukuzawa, Junichi Uematsu, Shin Kono, Sho Suzuki, Takemasa Sato, Naoko Yagi, Yuichiro Tsuji, Kenji Yagi, Chika Kusano, Takuji Gotoda, Fuminori Moriyasu, Department of Gastroenterology and Hepatology, Tokyo Medical University, Tokyo 160-0023, Japan.
authors.forename: Naoko
authors.initials: N
authors.lastname: Yagi
authors.affiliation: Masakatsu Fukuzawa, Junichi Uematsu, Shin Kono, Sho Suzuki, Takemasa Sato, Naoko Yagi, Yuichiro Tsuji, Kenji Yagi, Chika Kusano, Takuji Gotoda, Fuminori Moriyasu, Department of Gastroenterology and Hepatology, Tokyo Medical University, Tokyo 160-0023, Japan.
authors.forename: Yuichiro
authors.initials: Y
authors.lastname: Tsuji
authors.affiliation: Masakatsu Fukuzawa, Junichi Uematsu, Shin Kono, Sho Suzuki, Takemasa Sato, Naoko Yagi, Yuichiro Tsuji, Kenji Yagi, Chika Kusano, Takuji Gotoda, Fuminori Moriyasu, Department of Gastroenterology and Hepatology, Tokyo Medical University, Tokyo 160-0023, Japan.
authors.forename: Kenji
authors.initials: K
authors.lastname: Yagi
authors.affiliation: Masakatsu Fukuzawa, Junichi Uematsu, Shin Kono, Sho Suzuki, Takemasa Sato, Naoko Yagi, Yuichiro Tsuji, Kenji Yagi, Chika Kusano, Takuji Gotoda, Fuminori Moriyasu, Department of Gastroenterology and Hepatology, Tokyo Medical University, Tokyo 160-0023, Japan.
authors.forename: Chika
authors.initials: C
authors.lastname: Kusano
authors.affiliation: Masakatsu Fukuzawa, Junichi Uematsu, Shin Kono, Sho Suzuki, Takemasa Sato, Naoko Yagi, Yuichiro Tsuji, Kenji Yagi, Chika Kusano, Takuji Gotoda, Fuminori Moriyasu, Department of Gastroenterology and Hepatology, Tokyo Medical University, Tokyo 160-0023, Japan.
authors.forename: Takuji
authors.initials: T
authors.lastname: Gotoda
authors.affiliation: Masakatsu Fukuzawa, Junichi Uematsu, Shin Kono, Sho Suzuki, Takemasa Sato, Naoko Yagi, Yuichiro Tsuji, Kenji Yagi, Chika Kusano, Takuji Gotoda, Fuminori Moriyasu, Department of Gastroenterology and Hepatology, Tokyo Medical University, Tokyo 160-0023, Japan.
authors.forename: Takashi
authors.initials: T
authors.lastname: Kawai
authors.affiliation: Masakatsu Fukuzawa, Junichi Uematsu, Shin Kono, Sho Suzuki, Takemasa Sato, Naoko Yagi, Yuichiro Tsuji, Kenji Yagi, Chika Kusano, Takuji Gotoda, Fuminori Moriyasu, Department of Gastroenterology and Hepatology, Tokyo Medical University, Tokyo 160-0023, Japan.
authors.forename: Fuminori
authors.initials: F
authors.lastname: Moriyasu
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D016009:Chi-Square Distribution; D002983:Clinical Competence; D020685:Colonoscopes; D003113:Colonoscopy / Q000009:adverse effects / Q000295:instrumentation* / Q000379:methods; D004867:Equipment Design; D005260:Female; D006801:Humans; D007090:Image Interpretation, Computer-Assisted; D016014:Linear Models; D008280:Magnetics / Q000295:instrumentation*; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D010146:Pain / Q000175:diagnosis / Q000209:etiology; D010147:Pain Measurement; D011237:Predictive Value of Tests; D012189:Retrospective Studies; D012307:Risk Factors; D013997:Time Factors; D055815:Young Adult
keywords: Colonoscopy; Endoscopy position detecting unit; Training