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Effectiveness of pH measurements in predicting feeding tube placement

N Metheny1, P Williams, L Wiersema

  • 1Saint Louis University Medical Center, Missouri.

Nursing Research
|September 1, 1989
PubMed

Insights

Gastric pH testing effectively distinguishes feeding tube placement. Aspirate pH values reliably differentiate gastric from intestinal or respiratory placement, enhancing patient safety.

Area of Science:

  • Clinical Medicine
  • Gastroenterology
  • Critical Care Medicine

Background:

  • Accurate feeding tube placement is crucial for patient safety and effective nutrition delivery.
  • Misplacement of nasogastric (NG) and nasointestinal (NI) tubes can lead to serious complications.
  • Distinguishing between gastric, intestinal, and respiratory placement is essential.

Purpose of the Study:

  • To evaluate the efficacy of aspirate pH testing in differentiating feeding tube placement.
  • To compare pH values of aspirates from gastric, intestinal, and respiratory locations.
  • To determine the clinical utility of pH measurements for confirming tube position.

Main Methods:

  • A clinical study involving 181 adult subjects with small-bore nasogastric or nasointestinal tubes.
  • Collection of aspirate samples for pH measurement using pH-paper concurrently with X-rays.
  • pH readings were taken at initial placement and after 1-2 days of tube feedings.

Main Results:

  • pH values effectively differentiated gastric from intestinal placement (p < .0001).
  • 81% of nasogastric aspirates showed pH 1-4, while 88% of nasointestinal aspirates had pH ≥ 6.
  • An aspirate from a tube in the lung exhibited an alkaline pH.

Conclusions:

  • Aspirate pH testing is a valuable, non-invasive method for verifying feeding tube placement.
  • pH measurements can reliably distinguish gastric from intestinal placement.
  • This technique can help prevent complications associated with incorrect tube positioning.

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