The Science Journal of the American Association for Respiratory Care

2003 OPEN FORUM Abstracts

THE EFFECT OF STERILIZATION ON THE PROTOTYPE METEORÔ NEONATAL FLOW TRANSDUCER

Michael Tracy RRT-NPS, Timothy Myers BS, RRT-NPS
Rainbow Babies and Children's Hospital, Cleveland Ohio

Background:  
Previous work at our institution (Resp Care 2001; 46(10): 1138) compared the measured accuracy of Bird, Novametrix and Bicore neonatal 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 prototype Meteor neonatal probe and to determine if they would maintain accuracy after ETO sterilizations. 

Methods: 
Probes studied previously had their manufacturer's 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 prototype neonatal 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 10, 20, 30, 40 and 50cc. Five different probes were tested new out of the package, and each sensor was independently evaluated five times at each calibrated Vt. Each probe was tested with the BTPS correction factor on and off. Data were then analyzed as a percentage error for both new condition and after each of five subsequent 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 (Resp 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. Meteor data at ATP and at BTPS are shown in the table below. Bird , Novametrix and Bicore data from our previous work are included for comparison.

  Sterilizations  
    Volumes New 1st 2nd 3rd 4th 5th
    L U L U L U L U L U L U
Bird -10.4 9.7 -19.6 14.0 -17.0 15.4 -18.0 17.2 -15.1 16.6 -15.1 15.9  
Novametrix -4.0 5.5 -2.5 4.3 -4.6 5.5 -3.9 4.0 -2.3 4.7 -2.4 8.1  
Bicore -1.5 6.1 0 14.8 -1.0 19.4 -2.1 23.0 -3.8 25.0 -2.7 22.0  
Meteor(BTPS) 6.4 17.7 7.9 18.2 5.2 20.2 6.5 15.7 7.4 16.6 6.5 17.7  
Meteor(ATP) -3.3 5.2 -5.0 9.1 -1.7 6.6 -4.0 3.9 -2.3 4.3 -2.6 5.5  


CONCLUSION:
(1) The accuracy of the Meteor prototype neonatal probe (ATP) is within the 10% guidelines for clinical acceptance.  (2) The prototype Meteor neonatal probe, with the BTPS correction factor off (ATP), appears to be as accurate the Novametrix neonatal probe. (3) Since data was derived from a bench test at ATP, no conclusion can be reached about the accuracy of the BTPS correction factor.

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