Electrodes for 24 hours pH monitoring--a comparative study.

Abstract:

:Three pH electrodes in clinical use were examined--(1) antimony electrode with remote reference electrode (Synectics 0011), (2) glass electrode with remote reference electrode (Microelectrodes Inc. MI 506) and (3) combined glass electrode with integral reference electrode (Radiometer GK2801C). In vitro studies showed that both glass electrodes were similar and superior to the antimony electrode with respect to response time, drift, and sensitivity. The effect of the siting of the reference electrode on the recorded pH was examined in five human volunteers. The pH reading using a remote skin reference electrode was higher by a mean of 0.3 pH units (range 0.0-0.6) in the stomach, lower by 0.65 pH units (0.5-0.8) in the duodenum and lower by 0.3 pH units (0.0-0.6) in the oesophagus than that simultaneously obtained with an intraluminal reference electrode. Buccal reference electrodes gave similar readings to skin. Combined reference and glass pH electrodes are recommended for 24-hour ambulatory pH monitoring.

journal_name

Gut

journal_title

Gut

authors

McLauchlan G,Rawlings JM,Lucas ML,McCloy RF,Crean GP,McColl KE

doi

10.1136/gut.28.8.935

subject

Has Abstract

pub_date

1987-08-01 00:00:00

pages

935-9

issue

8

eissn

0017-5749

issn

1468-3288

journal_volume

28

pub_type

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