Critical Care

, 3:P172 | Cite as

Investigation into the effects of enteral feeding on gastric tonometry monitoring using the saline technique and the Tonocap

  • P Charlton
  • H Jeffrey
  • B Barrie
  • M Vucevic
Meeting abstract
  • 484 Downloads

Keywords

Catheter Emergency Medicine Ranitidine Enteral Feeding Ethical Committee Approval 

Aims of study

A prospective study of gastric PrCO2 in ventilated neurosurgical patients when given enteral feed comparing two techniques: time corrected saline (TCS) tonometry and air tonometry (Tonocap).

Methods

After Ethical committee approval and patient assent, two tonometric catheters were inserted into patients who after an overnight fast, were given 30 ml per hour of water for 4 h and following a 1 h rest, 30 ml per hour of enteral feed for 4 h. All patients received iv ranitidine. The PrCO2 was measured hourly using both techniques.

Results

Eight neurosurgical intensive care patients were studied (mean age 52 years, SD 15.3 years). All patients were stable and had no significant changes in cardiovascular or blood gas parameters during the study.

There was a significant difference between the TCS and Tonocap PrCO2: 4.84 (± 2.78) kPa compared to 6.74 (± 4.46) (r2 = 0.36). Bland–Altman analysis showed the mean bias between TCS and Tonocap PrCO2 and -1.85 kPa with a precision of ± 3.49 kPa.

There was no significant difference between the effects of feeding with the two techniques.
Figure

Effect of Feed

Conclusion

Enteral feeding has no effect on PrCO2 in neurosurgical patients. Saline tonometry under reads compared to the Tonocap similar to that of general intensive care patients.

Copyright information

© Current Science Ltd 1999

Authors and Affiliations

  • P Charlton
    • 1
  • H Jeffrey
    • 1
  • B Barrie
    • 1
  • M Vucevic
    • 1
  1. 1.Academic Unit of Anaesthesia The General Infirmary at LeedsLeedsUK

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