Accuracy of a point-of-care blood gas analyzer in gastric tonometry measurements of intramucosal pH (pHi) and P(CO2) gap.

Abstract:

PURPOSE: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(CO)(2) gap (intramucosal P(CO)(2) - Pa(CO)(2)). 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(CO)(2) data of tonometer saline (Pr(CO)(2)) from Opt and Elect were compared with P(CO)(2) data from a continuous air tonometer (Tonocap Tonometrics Division, Instrumentarium) for a bottle containing a mixed P(CO)(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(CO)(2), and B = -16.7 and P = 2.6 (mmHg) for the P(CO)(2) gap ( n = 27). In the in vitro study, the bias between the two values (Pr(CO)(2) and bottle P(CO)(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(CO)(2) gap because it does not provide an accurate P(CO)(2) for tonometry saline.

journal_name

J Anesth

journal_title

Journal of anesthesia

authors

Dohgomori H,Arikawa K,Kanmura Y

doi

10.1007/s00540-003-0209-1

subject

Has Abstract

pub_date

2004-01-01 00:00:00

pages

14-7

issue

1

eissn

0913-8668

issn

1438-8359

journal_volume

18

pub_type

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