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A comparison of pre- and postoperative transcutaneous carbon dioxide tensions and oxygen saturations in spontaneously breathing patients with TOSCA monitor: A-60

Kopka, A.; Wallace, E.; Binning, A.

European Journal of Anaesthesiology: May 2005 - Volume 22 - Issue - p 16
Monitoring: Equipment and Computers
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Department of Anaesthesia, Gartnavel General Hospital, Glasgow, United Kingdom

Background and Goal of Study: Postoperative (po) hypoventilation leading to hypercarbia and hypoxaemia is associated with the use of opioid analgesics and may cause potentially serious side effects (1). The TOSCA monitor (Linde, Basel, Switzerland) combines transcutaneous estimations of arterial carbon dioxide tensions (CO2 [kPa]) measured electrochemically and oxygen saturations (SaO2 [%]) measured photometrically. It correlates well with arterial partial pressures of both gases (2). The aim of this observational, prospective study is to evaluate preoperative (pr) and po CO2 and SaO2 in non-ventilated patients with no cardiopulmonary morbidity.

Materials and Methods: We enrolled nine patients (ASA 1-2, m = 5, f = 4) scheduled for laparotomy under general anaesthesia. Postoperative pain relief was standardised to patient controlled analgesia (PCA) and patients were given 4 Lmin−1 O2 via oxygen mask. We recorded total Morphine until 06:00 hours on the first po day (M24, [mg]). Data were collected from 22:00-06:00 hours on both the pre- and postoperative nights and analysed with Download 2001 for Linde TOSCA.

Results and Discussions: Descriptive data are shown.

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Conclusion: In nine spontaneously breathing patients on PCA and 4 L min−1 O2 post laparotomy we found relevant hypercarbia but no hypoxaemia using transcutaneous estimations of CO2 and SpO2 with Linde TOSCA.

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References:

1 Yentis SM. Oxford: Butterworth-Heinemann, 2000.
2 Rohling R. J Clin Monit 1999; 15: 23-27.
© 2005 European Society of Anaesthesiology