Background and Study Aims: Unavoidable catheter movement during sphincter of Oddi (SO) manometry can produce
considerable variations in the basal pressure, due to movement of the recording sidehole.
The sleeve sensor is a perfused channel which records the highest pressure point along
its length. The aim of the study was to develop and evaluate a prototype sleeve sensor
for SO manometry.
Materials and Methods: Bench-testing was used to assess the dynamic performance of the sleeve and sidehole
assemblies. Recordings were initially made with a standard triple-lumen catheter and
then with a purpose-built manometric assembly which had a 15 mm long sleeve sensor.
Results: A perfusion rate of 0.04 ml/min gave the best balance between baseline pressure offset
and rise rate. Recordings were attempted in nine patients and successfully achieved
in four. The sleeve and sidehole recordings of the maximal basal pressure did not
differ significantly (mean ± SEM, 86.1 ± 26.5 mmHg vs. 90.1 ± 21.0 mmHg, P = 0.57, r = 0.998).
Conclusions: Unnecessarily high perfusion rates are being used for SO manometry. The sleeve sensor
has the potential to monitor SO pressure more reliably than the currently used perfused
sidehole method and should enhance the safety of prolonged SO manometry.
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A. G. Craig, M.D.
Dept. of General and Digestive Surgery
Flinders Medical Centre
Bedford Park, South Australia
Australia 5042
Fax: + 61-8-82045966
eMail: sandy.craig@flinders.edu.au