Correctly selecting a liquid-filled nasogastric infant feeding catheter to measure intraesophageal pressure

C. G. Hartford*, G. G. Rogers, M. J. Turner

*Corresponding author for this work

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Polyvinyl chloride (PVC) nasogastric feeding catheters are used clinically to measure intraesophageal pressure as an estimate of pleural pressure for calculating lung compliance in infants. The accuracy of pressure measurement of 4 French gauge (FG) catheter sizes and three brands of liquid- filled catheter manometer systems (CMS) was evaluated by determining their resonance-frequency amplitude and phase properties. All CMS were underdamped and resonated. No CMS exhibited a uniform mean frequency response above 11 Hz. The maximum respiratory rate (F(rr)) within which CMS could potentially measure dynamic intraesophageal pressure within a 5% error limit was determined (F(rr)): the highest mean F(rr) recorded reliably in large- diameter catheters was 82 breaths/min. Significant CMS differences in accuracy existed between catheter FG sizes and between catheters of similar diameters but differing brands. Correlation (r2) between catheter inner diameter and CMS F(rr) was 0.66 across brands. In conclusion, intraesophageal PVC liquid-filled feeding catheters are suitable for estimating pleural pressures in subjects mechanically ventilated without sharp inspiratory waveforms or high respiratory rates. Quantitative frequency response characterization of different nasogastric catheter brands and different diameters is mandatory prior to their utilization.

Original languageEnglish
Pages (from-to)362-369
Number of pages8
JournalPediatric Pulmonology
Volume23
Issue number5
DOIs
Publication statusPublished - May 1997
Externally publishedYes

Keywords

  • esophageal manometry
  • feeding catheters
  • lung compliance
  • mechanical ventilation
  • pleural pressure
  • respiratory mechanics

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