Investigation of the efficacy of colorimetric capnometry method used to verify the correct placement of the nasogastric tube.

Objectives: This present study was designed to determine the efficacy of the colorimetric capnometry method used to verify the correct placement of the nasogastric tube.
Methods: The present study comprised forty patients who had a nasogastric tube inserted and were being monitored in the adult intensive care unit. After the insertion of the nasogastric tube, 40 colorimetric capnometry and 40 auscultation measurements were performed. Auscultation and colorimetric capnometry results were compared with tube placement results confirmed radiologically.
Results: In the confirmation of the placement of the nasogastric tube, the consistency was 97.5% (p<0.05) between the colorimetric capnometry method and the radiological method, and 82.5% (p>0.05) between the auscultatory method and the radiological method. The oesophageal placement of the nasogastric tube was detected with the colorimetric capnometry method, but the gastric and duodenal insertions were not determined. While the sensitivity and specificity of the colorimetric capnometry method in determining the correct placement of the nasogastric tube were 1.00 and 0.667 respectively, those of the auscultatory method were 0.89 and 0.0 respectively.
Conclusion: As a result, for the confirmation of the NGT placement, the colorimetric capnometry method is considered more reliable than the auscultatory method and is compatible with the radiological method. However, the colorimetric capnometry method is inadequate to distinguish between the gastric or duodenal insertion.
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