[abstract] O2 LEAKAGE DURING TRANSCUTANEOUS OXYGEN TENSION (TCPO2)MONITORING IN A MONOPLACE CHAMBER.

Rubicon Research Repository/Manakin Repository

[abstract] O2 LEAKAGE DURING TRANSCUTANEOUS OXYGEN TENSION (TCPO2)MONITORING IN A MONOPLACE CHAMBER.

Show full item record


Title: [abstract] O2 LEAKAGE DURING TRANSCUTANEOUS OXYGEN TENSION (TCPO2)MONITORING IN A MONOPLACE CHAMBER.
Author: Nokay, GH; Josefsen, L; Camporesi, EM
Abstract: Transcutaneous oximetry has been utilized as a prognostic indicator of healing in patients with varying disorders treated with HBO. Most previous data have been obtained in multiplace chambers, with the electrode surrounded by compressed air, while patients breath O2. In the setting of a monoplace hyperbaric chamber the ambient gas is often 100% O2, and this may cause greater O2 leakege beneath the adhesive ring of the electrode, and might induce falsely high readings for TcPO2. We tested this hypothesis by measuring TcPO2 with or without an O2-impermeable membrane covering the electrode. Transcutaneous PO2 and PCO2 values were obtained with a TCM3 monitor (Radiometer, Copenhagen) in 8 patients with normal skin blood flow, undergoing multiple hyperbaric oxygen therapy sessions for various disorders. All patients were informed of the study. The protocol was approved by the institutional review board. Measurements were performed in two random steps; in a session the electrode was placed on the chest in subclavicular position and was covered loosely with an oxygen-impermeable adhesive plastic dressing (Tegaderm, 3M) and in another session the electrode was left uncovered, following manufacturer's recommandation and appropriate calibration. The table illustrates resting room air data and values at 2 ATA, in mmHg, obtained at different times of exposure. (*: p<0.01, covered vs. uncovered). [table] Initial(n=8), 20 min(n=8), 30 min(n=8), 45 min(n=7), At Peak PO2(n=8); Ambient press.: 1ATA, 2 ATA, 2 ATA, 2 ATA, 2 ATA; Breathing gas: Air, O2, O2, O2, O2; PCO2 covered: 35.0, 36.1, 35.6, 35.5, 36.13; PCO2 uncovered: 37.8, 36.4, 36.4, 35.5, 36.2; PO2 covered: 44, 895.6*, 936.6*, 923.6*, 964.l*; PO2 uncovered: 44.8, 1092.9, 1121.8, 1066.4, 1146.4; [end table] The difference between uncovered and covered TcPO2 measurements ranged from 15 to 22% and was statistically significant. Changes in TcPCO2 were not significant. The data support a time-dependent leakage of O2 into the electrode, at pressure, in normally perfused skin. We suggest that if TcPO2 measurements are from poor curculation areas (e.g. diabetic non-healing wounds) further leakage would cause even higher readings.
Description: Abstract of the Undersea and Hyperbaric Medical Society, Inc. Annual Scientific Meeting held July 7-10, 1993. World Trade and Convention Centre, Halifax, Nova Scotia, Canada. (http://www.uhms.org)
URI: http://archive.rubicon-foundation.org/8064
Date: 1993

Files in this item

Files Size Format View
abstract.txt 258bytes Text file View/Open

This item appears in the following Collection(s)

  • UHMS Meeting Abstracts
    This is a collection of the published abstracts from the Undersea and Hyperbaric Medical Society (UHMS) annual meetings.

Show full item record

Browse

My Account