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  • Title: Evaluation of a new catheter for esophageal pH monitoring.
    Author: Kuit JA, Schepel SJ, Bijleveld CM, Kleibeuker JH.
    Journal: Hepatogastroenterology; 1991 Feb; 38(1):78-80. PubMed ID: 2026394.
    Abstract:
    A new catheter, provided with an Ion Sensitive Field Effect Transistor as a pH sensor and incorporating a reference electrode, was evaluated for esophageal pH recording. The pH-sensitivity was 54 mV/pH in vitro, with a linear response between pH 2 and pH 9. Clinical semi-ambulatory 24-hour esophageal pH recordings were carried out in 6 adults and 15 infants. System drift after 24-hour in vivo recording was 0.14 pH units +/- 0.10 pH units, and -0.01 pH units +/- 0.10 pH units, in pH 4.0 and pH 7.0 calibration solution, respectively, in the pediatric group (n = 15). It is concluded that the reusable catheter combines accurate esophageal pH monitoring with optimum patient comfort.
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