1995 OPEN FORUM Abstracts
ACCURACY OF NEONATAL TIDAL VOLUME MEASUREMENT DEVICES
Dennis Bing, RRT, Mark Mammel, MD, Infant Diagnostic and Research Center, Children's Healthcare, St. Paul, MN
Introduction: Measurement of V_T in newborn infants and small children has recently become available for use at the bedside in the NICU. The purpose of this study was to test 7 flow/ volume measurement systems commercially available for neonatal use for accuracy in reported V_T values.
Methods: We tested these systems: Bear NVM-1, BICORE CP-100, Bird Partner Ili, Drager Babylog Ventilator, Novametrix VenTrak (disposable sensor), PeDS and SensorMedics 2600. We calibrated each system according to manufacturer's instructions immediately prior to testing. We tested each device using calibration syringes (Hans Rudolph, #5510, and #5520) at six known V_T values: 4, 6, 10, 20,40, and 60 mLs., hand cycling the calibration syringe at two "breathing rates", 30 and 60 per minute. We collected three test values at each V_T and rate combination and report the mean as compared to the known test standard. All values are normalized to BTPS.
Results: Data were evaluated for accuracy in V_T measurement as mean variances from test standard in mLs., and in per cent:
meanvariance, mean variance,
Bear NVM-1-0.76±1.00 -1.1±4.5
BICORE CP-100+2.35±4.53 +13.5±9.3
Bird Partner Ili-0.03±0.39 -1.7±3.2
P e D S -1.41±2.47 -0.2±8.8
SensorMedics 2600 +2.31±2.7+6.7±4.6
All devices except the BICORE CP-100 reported V_T accurately ( < 10% variance). Conclusion: Devices are commercially available for accurate measurement of V_T within the range expected for Neonatal ICU patients.