Radio-opacity
Polyurethane tubes were almost always visible in both the chest and abdomen (>98%) with good agreement between those interpreting results (>99%). In contrast, PVC Ryles tubes could not be clearly seen in the chest (57%: Kappa=0.332; p=0.002 (fair agreement)) or abdomen (71%: Kappa=0.552; p<0.001 (moderate agreement)), wereinvisible in 23% and interpretations differed between WR and
ST in 18-33%; this would leave room for doubt as to tube position based on X-ray. Tubes used for feeding or wherever radiological confirmation may be necessary should have proven, in vivo, radio-opacity. In contrast, Ryles tubes cannot be considered safe for radiological confirmation of position and, additionally, their stiffness after 7 days’ use may pose a risk for mucosal damage, whereas replacement and use of multiple X-rays to confirm position would increase cost. Polyurethane tubes do not appear to stiffen but there was no systematic study of this aspect of care
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