2016 年 86 巻 5 号 p. 459-466
It is recommended to verify the dwelling position of nasal feeding tube in the stomach by sampling gastric fluids, however, it is practically difficult to apply. We inserted a nasal feeding tube in 15 subjects, and then attempted to sample gastric fluids and confirmed the position of the tip by a X-ray examination. Measuring lengths of the tube segmented by body-landmarks (e.g., nose, gastric cardia), we verified the correlations between the body-height and the appropriate tube length to be inserted. The average ratio of the tube length from the nose to the gastric cardia against the body-height of the subjects was 0.29±0.01. The average tube length in the stomach was 103.5±9.9 mm, which was not correlated to the subjects′ body-heights. As the results, a simplified formula “Body-height (cm) × 0.3 + 10 cm” can be suggested to estimate the adequate insertion length of the tube which can sample gastric fluids. Further, to easily visualize the dwelling length of the tube in the stomach by a x-ray examination, our results might recommend non-opaque marks with 1-cm increments between the tip and 10 cm-length.