The Science Journal of the American Association for Respiratory Care

2002 OPEN FORUM Abstracts

THE EFFECT OF STERILIZATION ON THE METEORÕ PEDIATRIC /ADULT FLOW TRANSDUCER

Michael Tracy RRT, Timothy Myers BS, RRT, Robert Chatburn RRT, FAARC Rainbow Babies and ChildrenÕs Hospital, Cleveland Ohio

BACKGROUND: Previous work at our institution (Respir Care 2001;46(10):1138) compared the measured accuracy of Bird and Novametrix flow/volume transducers to determine initial accuracy and accuracy after ethylene oxide (ETO) sterilizations. The purpose of this study was to measure the initial accuracy of the Meteorª probes, and to determine if they would maintain accuracy after ETO sterilizations.

Methods: Probes studied previously had their manufacturerÕs accuracy range from 3% to 15%. We arbitrarily set a clinically acceptable error range of ±10% for uniform consistency. The same ±10% was applied to this bench test for consistency in this retrospective comparison. New Meteor pediatric/adult flow transducers were evaluated for accuracy of tidal volume (Vt) delivery using calibrated syringes. As in our previous work, probes were tested at Vt of 200, 400, 700 and 1000cc. Five different probes were tested new out of the package, and each sensor was independently evaluated five times at each calibrated Vt. Data were then analyzed as a percentage error for both new condition and after each of five resterilizations. Error was calculated as the difference (measured value true value) and expressed as a percentage of the true value. Mean and standard deviation was calculated for errors across all volumes for each condition (new and resterilizations). Error intervals were calculated as mean error ±2.31 x SD (Respir Care 1996;41:1092-1099) and interpreted as the expected error for 95% of future measurements at the 99% confidence level.

Results: Each number in the table below summarizes 100 volume measurements. Data below are lower (L) and upper (U) values of the error intervals. Bird and Novametrix data obtained from our previous work are included for comparison.

Sterilizations
Pediatric Volumes
New
1st
2nd
3rd
4th
5th
 
L
U
L
U
L
U
L
U
L
U
L
U
Bird
-2.3
4.9
-5.0
2.8
-3.8
2.0
-4.3
1.1
-6.4
3.4
-4.7
2.6
Novametrix
-8.0
-2.1
-10.1
-2.0
-8.1
-2.9
-9.8
-3.1
-10.3
-1.8
-8.3
-3.1
Meteor
7.7
14.8
9.9
13.4
9.5
13.2
9.3
14.4
11.1
15.2
10.0
14.1

CONCLUSION: In this bench test, the results indicate that Meteor probe error was within the range of values specified by other manufacturers (Bird and Novametrix). However; they exceeded our standard of acceptible error (± 10%), while the Bird and Novametrix probes did not.

OF-02-042

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