• Anesthesia and analgesia · Apr 2010

    Clinical Trial

    A nasal catheter for the measurement of end-tidal carbon dioxide in spontaneously breathing patients: a preliminary evaluation.

    • Mohamed Samy Abdel Raheem and Olaa M Wahba.
    • Anesthesiology Department, Asyut University Hospital, Asyut, Egypt. msraheem@doctors.net.uk
    • Anesth. Analg. 2010 Apr 1; 110 (4): 1039-42.

    BackgroundSeveral devices have been proposed to monitor end-tidal carbon dioxide tension (Petco(2)) in spontaneously breathing patients; however, many have been reported to be inaccurate. We designed this study to investigate the accuracy of a balloon-tipped nasal catheter in measuring Petco(2) in nontracheally intubated, spontaneously breathing patients.MethodsThe catheter was assembled using a 14-F rubber Foley catheter, a tracheal tube pilot balloon, and the plastic sheath from an 18-gauge needle. The catheter was connected to the sampling tube of a gas analyzer. Petco(2) and Paco(2) were determined simultaneously in 20 otherwise healthy postsurgical patients while receiving oxygen.ResultsThe mean Petco(2) - Paco(2) difference was -4.4 +/- 1.6 (SD) mm Hg with a correlation coefficient r = +0.87 (P < 0.001).ConclusionOur results suggest that a balloon-tipped nasal catheter can provide a simple, easy, and reliable method for Petco(2) measurement in nontracheally intubated, spontaneously breathing patients.

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