• P Seguin, V Le Bouquin, D Aguillon, A Maurice, B Laviolle, and Y Mallédant.
• Service de réanimation chirurgicale, hôpital Pontchaillou, 2, rue Henri-Le-Guilloux, 35033 Rennes cedex 09, France. philippe.seguin@chu-rennes.fr
• Ann Fr Anesth Reanim. 2005 Jun 1; 24 (6): 594-9.

ObjectiveEvaluation of three methods (aspiration of gastric fluid, pH measurement of gastric fluid, and insufflation of air) in order to determine the right position of the nasogastric (NG) tube.Study DesignProspective, observational study in an intensive care unit.Patients And MethodsAll patients requiring a NG tube were included. Since the NG tube was inserted three tests were successively performed: aspiration of gastric fluid, pH measurement of the gastric fluid, and auscultation over the epigastrium of air injected through the NG tube. The feasibility and the results obtained for each test were noted and compared to chest X-ray, considered as the reference. Chest X-ray classified the complications as major or minor.ResultsA total of 419 NG tube (202 decompressive NG tube and 217 gastric feeding tube) were analysed in 280 patients. Malpositions of the NG tube were observed in 10% (majors, n=11 and minors, n=31). Aspiration of gastric fluid and pH measurement were not sensible (77% and 49%, respectively) and not specific (38% and 74%, respectively). Insufflation of air was sensible (96%) but not specific (17%). The combination of the three methods did not improve the sensibility and specificity. Two complications were only detected by chest X-ray (one insertion in the intrapleural space, and one pneumothorax).ConclusionNone of the test evaluated, alone or associated, was sufficient to avoid chest X-ray. Moreover the occurrence of two potential and serious complications only detected by chest X-ray increase this assertion.

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