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Keywords:

  • nasogastric tube;
  • feeding tube;
  • enteral feeding;
  • neonates;
  • premature infants;
  • randomized controlled trial

ABSTRACT

Objective: To compare error rates of three existing methods of predicting the gastric tube insertion length in a group of neonates <1 month corrected age: age-related, height-based (ARHB); direct distance nose-ear-xiphoid (NEX); and direct distance nose-ear-mid-umbilicus (NEMU).

Design: Randomized controlled trial.

Setting: Five neonatal care units in a large midwestern city.

Participants: One hundred and seventy-three hospitalized neonates.

Methods: Neonates were randomly assigned to one of three groups: ARHB, NEX, or NEMU. For primary analysis, only tubes placed too high with the tube tip in the esophagus or at the gastroesophageal junction were considered to be misplaced. For secondary analysis, a stricter definition was used, and low placements (pylorus or duodenum) were also considered to be misplaced. All radiographs were blinded and read by a pediatric radiologist.

Results: For the primary analysis, the differences in percentages of correctly placed tubes among the three methods was statistically significant (χ2=34.45; p<.0001), with NEMU and ARHB more accurate than NEX (NEMU χ2=18.59, p<.0001; ARHB χ2=21.34, p<.0001). Using the stricter definition for placement, ARHB was not significantly different from NEX (p=.0615). A new ARHB equation was developed specific for neonates <1 month corrected age.

Conclusions: Direct distance nose-ear-xiphoid should no longer be used as an nasogastric/orogastric (NG/OG) tube insertion-length predictor in neonates. Either NEMU for NG/OG tubes or the new ARHB equation for NG tubes should be used.