Performance of Given suspected blood indicator.
OBJECTIVE
Given Imaging (Yoqneam, Israel) has developed a suspected blood indicator (SBI) function for its wireless capsule endoscopy (WCE) software. The SBI detects blood and marks appropriate images for interrogation. The sensitivity and accuracy of SBI and its role in examining WCE studies is unknown. Our aim was to evaluate the accuracy of this new software in detecting small bowel lesions.


METHODS
WCE reports of all patients referred for WCE in October and November, 2002, were reviewed. The images from each patient were reviewed by experienced gastroenterologists at 15 frames/s. The findings detected by gastroenterologists were compared to those recognized by SBI. Arteriovenous malformations (AVMs), ulcers, erosions, and sites of active bleeding were considered significant lesions.


RESULTS
A total of 24 patients (16 women and eight men, mean age 59 yr) were studied during this period. The indications for the study were iron deficiency anemia in 18 patients and abdominal pain in six patients. A total of 109 lesions were identified by gastroenterologists (47 AVMs, 18 active bleeding ulcers, 18 ulcers without bleeding, and 26 erosions). Active bleeding seen by gastroenterologists was secondary to AVMs (five cases), jejunal ulcers (11 cases, all in the same patient), and gastric ulcers (two cases). A total of 31 potential areas of blood were identified by SBI. When compared to those findings recognized by gastroenterologists, 28 lesions were correctly identified (six AVMs, 13 active bleeding ulcers, (three AVMs and 10 jejunal ulcers), seven nonbleeding ulcers, and two nonbleeding erosions. The overall sensitivity, positive predictive value, and accuracy of SBI to detect significant small bowel lesions were 25.7%, 90%, and 34.8%, respectively. If only actively bleeding lesions in the small bowel were considered, SBI had sensitivity, positive predictive value, and accuracy of 81.2%, 81.3%, and 83.3%, respectively.


CONCLUSIONS
SBI has good sensitivity and positive predictive value for actively bleeding lesions in the small bowel. Complete review of the study by the physician is still needed. SBI should be considered as a complementary and rapid screening tool for gastroenterologists to identify actively bleeding lesions.
Liangpunsakul
Suthat
S
Division of Gastroenterology and Hepatology, Department of Medicine, Indiana University School of Medicine, 550 N. University Boulevard, UH 4100, Indianapolis, IN 46202, USA.
Mays
Lori
L
Rex
Douglas K
DK
D016009:Chi-Square Distribution; D016145:Endoscopy, Digestive System / Q000379:methods*; D005260:Female; D006471:Gastrointestinal Hemorrhage / Q000175:diagnosis* / Q000000981:diagnostic imaging; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D011859:Radiography; D012680:Sensitivity and Specificity; D012984:Software