Is small-bowel radiography necessary before double-balloon endoscopy?
OBJECTIVE
Small-bowel radiography may be replaced by enteroscopy in the diagnosis of small-intestine lesions. We retrospectively elucidated the diagnostic yield of small-bowel radiography performed before double-balloon endoscopy.


METHODS
One hundred twenty-four patients who underwent double-balloon endoscopy during the period 2004-2006 were classified into those with abnormal radiographic findings (n = 45), normal radiographic findings (n = 31), and no small-bowl radiographs (n = 48). The classification was based on the use of small-bowel radiography and the diagnosis before double-balloon endoscopy. The indications for, approaches to, and diagnostic yields of double-balloon endoscopy were compared for the three groups. The diagnostic yield of small-bowel radiography was considered positive when any sign of pathologic change in the small bowel was identified. The diagnostic yield of double-balloon endoscopy was considered positive when endoscopic or biopsy findings explained the clinical manifestations.


RESULTS
The group with abnormal findings on small-bowel radiography was younger (15-86 years) and less frequently had obscure bleeding (8.9%) than the group with normal findings on small-bowel radiography (age, 17-84 years; frequency of obscure bleeding, 45.2%) (p = 0.01) or the group without small-bowel radiographs (age, 15-91 years; frequency of obscure bleeding, 64.6%) (p < 0.0001). The positive diagnostic yield of double-balloon endoscopy was highest in the group with abnormal findings on small-bowel radiography (71.1%), followed by the group with no small-bowel radiographs (45.8%) and the group with normal findings on small-bowel radiography (35.5%) (p = 0.0002). Among patients who did undergo small-bowl radiography, the accuracy of the technique was 68.4%, the positive predictive value was 71.1%, and the negative predictive value was 64.5%. The positive diagnostic yields of small-bowel radiography and double-balloon endoscopy were not statistically different (59.2% for small-bowel radiography, 56.6% for double-balloon endoscopy; p > 0.1).


CONCLUSIONS
The diagnostic accuracy of double-balloon endoscopy seems to improve if the procedure is preceded by small-bowel radiography.
Department of Medicine and Clinical Science, Graduate School of Medical Sciences, Kyushu University, Maidashi 3-1-1, Higashi-ku, Fukuoka 812-8582, Japan. matane@intmed2.med.kyushu-u.ac.jp
Takayuki
T
Matsumoto
Motohiro
M
Esaki
Shinichiro
S
Yada
Yukihiko
Y
Jo
Tomohiko
T
Moriyama
Mitsuo
M
Iida
D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002404:Catheterization / Q000295:instrumentation / Q000379:methods*; D020776:Endoscopes, Gastrointestinal; D016099:Endoscopy, Gastrointestinal / Q000379:methods*; D005260:Female; D006801:Humans; D007421:Intestine, Small / Q000000981:diagnostic imaging* / Q000473:pathology*; D008297:Male; D008875:Middle Aged; D011859:Radiography; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity