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- Title
Accuracy of a point-of-care blood gas analyzer in gastric tonometry measurements of intramucosal pH (pHi) and P[sub CO][sub 2] gap.
- Authors
Dohgomori, Hiroshi; Arikawa, Kazuhiro; Kanmura, Yuichi
- Abstract
Purpose Methods. We compared the point-of-care analyzer (Opti; AVL Medical Instruments, Schaffhausen, Switzerland; “Opt”) with a conventional analyzer (Compact 2 AVL Medical Instruments, Schaffhausen; “Elect”) in a clinical study (Elect being taking as the standard). In an in vitro study, P[sub CO][sub 2] data of tonometer saline (Pr[sub CO][sub 2]) from Opt and Elect were compared with P[sub CO][sub 2] data from a continuous air tonometer (Tonocap Tonometrics Division, Instrumentarium) for a bottle containing a mixed P[sub CO][sub 2] gas. Data were evaluated by the Bland-Altman method. Results. In the clinical study, the bias (B) and precision (P) were: B = 0.223 and P = 0.056 for pHi, B = -14.0 and P = 2.43 (mmHg) for Pr[sub CO][sub 2], and B = -16.7 and P = 2.6 (mmHg) for the P[sub CO][sub 2] gap (n = 27). In the in vitro study, the bias between the two values (Pr[sub CO][sub 2] and bottle P[sub CO][sub 2]) was -1.98 mmHg and precision was 1.23 mmHg for Elect, but for Opt, these values were -22.09 mmHg and 3.15 mmHg, respectively (n = 18). Conclusion. Opt is not suitable for measuring pHi and the P[sub CO][sub 2] gap because it does not provide an accurate P[sub CO][sub 2] for tonometry saline. We assessed the accuracy of a point-of-care blood gas analyzer in providing data from saline samples obtained by gastrointestinal tonometry (Tonometrics Catheter; Tonometrics Division, Instrumentarium, Helsinki, Finland) for the calculation of intramucosal pH (pHi) and the P[sub CO][sub 2] gap (intramucosal P[sub CO][sub 2] - Pa[sub CO][sub 2]).
- Subjects
TONOMETRY; BLOOD gases analysis; GASTROENTERITIS; MEDICAL equipment; GLAUCOMA diagnosis
- Publication
Journal of Anesthesia, 2004, Vol 18, Issue 1, p14
- ISSN
0913-8668
- Publication type
Article
- DOI
10.1007/s00540-003-0209-1