There is a scarcity of qualified studies to evaluate fiber supplementation in the treatment of childhood constipation, generating a low degree of confidence in estimating the real effect of this intervention on this population. Today, according to the current literature, adequate fiber intake should only be recommended for functional constipation, and fiber supplementation should not be prescribed in the diet of constipated children and adolescents.

1 no previous studies have established sex-specific chest CT measurement thresholds for detection of cardiac chamber enlargement. The purpose of this study is to establish sex-specific axial chest CT measurement thresholds to identify cardiac chamber enlargement with cardiac MRI as the reference standard. We hypothesized that cardiac chamber enlargement can be identified with high specificity on axial chest CT images. Materials and Methods Study DesignThis retrospective cross-sectional study was approved by the institutional research ethics board. The requirement for written informed consent was waived. Consecutive adults (older than 18 years) who underwent contrast-enhanced nongated chest CT and cardiac MRI within a 7-day interval be-C a r d io p u l m o n a r y I m ag i ng • O r ig i n a l R e s e a rc h AJR 2018; 211:1-7 0361-803X/18/2115-1