Publication: False-negative appendicitis at ultrasound: Nature and association
Issued Date
2014-01-01
Resource Type
ISSN
1879291X
03015629
03015629
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2-s2.0-84901982079
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Mahidol University
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SCOPUS
Bibliographic Citation
Ultrasound in Medicine and Biology. Vol.40, No.7 (2014), 1483-1489
Suggested Citation
Patwadee Piyarom, Rathachai Kaewlai False-negative appendicitis at ultrasound: Nature and association. Ultrasound in Medicine and Biology. Vol.40, No.7 (2014), 1483-1489. doi:10.1016/j.ultrasmedbio.2014.02.014 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/33387
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Title
False-negative appendicitis at ultrasound: Nature and association
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Abstract
The objective was to describe nature and factors associated with false-negative ultrasound (US) for adult appendicitis. Patients with pathologically proven appendicitis and pre-operative US from January 2011 to May 2013 were included in this retrospective case-control study. They were divided into true-positive and false-negative groups, matched by age and gender. There were 112 patients (40 men, mean age= 40 y, 56 true positives) included. Two factors were found differ significantly: abdominal wall thickness and pain score. Greater abdominal wall thickness (18.6 mm vs. 14.9 mm, p= 0.001) and lower pain score (6.6 vs. 7.5, p= 0.018) were statistically associated with false negativity. The two groups did not differ significantly in terms of weight, height, body mass index, symptom duration, Alvarado score, US examination time, appendix position/size, perforation rate and operator. In conclusion, lower pain score and increased abdominal wall thickness are associated with false negativity in US examinations. © 2014 World Federation for Ultrasound in Medicine & Biology.