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- Title
CLINICAL VALIDATION OF A DIGITAL TRANSCUTANEOUS PCO<sub>2</sub>/SPO<sub>2</sub> EAR SENSOR IN ADULT PATIENTS AFTER CARDIAC SURGERY.
- Authors
Baulig, Werner; Schütt, Philipp; Roth, Hans R.; Hayoz, Josef; Schmid, Edith R.
- Abstract
Abstract Objective The aim of this study was to validate the V-Sign digital sensor (SenTec AG, Therweil, Switzerland) for combined noninvasive assessment of pulse oxymetric oxygen saturation (SpO2) and transcutaneous carbon dioxide tension (PtcCO2) in adults after cardiac surgery. Methods In twenty one patients, aged 51–86 years, simultaneous measurements of blood gases with the V-Sign Sensor and with two Nellcor Durasensors (model DS-100A), one at the opposite earlobe and one with a finger clip, were compared first during hyper-, normo- and hypocapnia and at different pulse rates using a pacemaker, and then at 2-h intervals up to 8 h. Agreement was assessed by Bland-Altman analysis. Results PtcCO2 data of three patients were excluded because of calibration failure of the device. Median (range) PtcCO2 for the remaining patients was 5.49 (3.3–7.6) kPa and arterial carbon dioxide tension (PaCO2) was 5.43 (3.61–7.41) kPa. Corresponding mean bias was +0.05 kPa and limits of agreement (LOA) were −1.2/+1.3 kPa. During normo- and hypoventilation, mean bias was good at +0.02 and +0.04 kPa respectively, but limits of agreement were poor at −0.67/+0.69 and −0.81/+0.88 kPa. In 10 patients, an initial overshoot of PtcCO2 was observed. Mean bias of SpO2 and pulse rate was close to zero (−1.5% and +0.001 bpm respectively), but limits of agreement were unacceptably high (−21.4/+18.4% and −22.3/+22.3 bpm). Conclusions In the present state of development the SenTeC Digital monitor V-Sign device has serious limitations. Additional efforts are necessary to eliminate calibration failures and the initial overshoot of PtcCO2 as well as to improve detection of SpO2 and pulse rate.
- Subjects
CARBON dioxide; CARDIAC surgery; BLOOD gases; PATIENTS
- Publication
Journal of Clinical Monitoring & Computing, 2007, Vol 21, Issue 5, p303
- ISSN
1387-1307
- Publication type
Article
- DOI
10.1007/s10877-007-9088-6