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Evaluation of a new combined SpO 2 /PtcCO 2 sensor in anaesthetized paediatric patients
Author(s) -
Dullenkopf Alexander,
Bernardo Stefano Di,
Berger Felix,
Fasnacht Margrit,
Gerber Andreas C.,
Weiss Markus
Publication year - 2003
Publication title -
pediatric anesthesia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.704
H-Index - 82
eISSN - 1460-9592
pISSN - 1155-5645
DOI - 10.1046/j.1460-9592.2003.01146.x
Subject(s) - medicine , anesthesia , pulse oximetry , limits of agreement , arterial blood , blood pressure , blood gas analysis , nuclear medicine
Summary Background The recently introduced TOSCA monitor (Linde Medical Sensors AG, Basel, Switzerland) combines pulse oximetry (SpO 2 ) and transcutaneous PCO 2 (PtcCO 2 ) monitoring in a single ear sensor. The aim of the present study was to evaluate accuracy of the TOSCA monitor to estimate SaO 2 and PaCO 2 in anaesthetized children. Methods With approval of the hospital ethical committee and after obtaining informed parental consent, the TOSCA sensor was attached to one ear lobe of anaesthetized children in whom arterial access was established for cardiac catheterization or invasive blood pressure monitoring. SpO and PtcCO 2 as well as SpO and P E CO 2 values from the anaesthesia monitoring (AS5; Datex‐Ohmeda, Helsinki, Finland) were compared with SaO 2 and PaCO 2 values from arterial blood gas analysis. Corresponding data were compared using Bland Altman bias analysis. Results A total of 111 blood samples were taken from 60 children (median age: 4.41 years; 0.35–16.13 years). SaO 2 values ranged from 63 to 100% (median: 98.7%), PaCO 2 ranged from 3.8 to 7.3 kPa (median: 4.6 kPa). Mean difference (±2 sd ) between PaCO 2 and PtcCO 2 was –0.035 kPa (±0.74 kPa), between PaCO 2 and P E CO 2 0.002 kPa (0.73 kPa), respectively (1 kPa = 7.3 mmHg). Bias and precision between SaO 2 and SpO was –0.63% (±2.77%) and 0.13% (±4.52%) between SaO 2 and SpO. Conclusions In anaesthetized children, the TOSCA ear sensor allows estimation of SaO 2 and PaCO 2 , comparable in accuracy to endtidal capnometry and finger pulse oximetry. This makes the TOSCA monitor a helpful add‐on to respiratory monitoring in anaesthetized children, in situations, in which endtidal capnometry is unreliable or difficult to establish.