When pneumotachography is used during intermittent positive pressure ventilation (IPPV), the design of some differential pressure transducers can cause measurement errors. These errors may be avoided by using differential pressure transducers which have small, equal chambers free from temperature sensitive electrical elements. Few of the transducers which are sensitive enough for clinical use fulfil these requirements.
References
1.
AbrahamsN., FiskG. C., ChurchesA. E., LoughmanJ., VonwillerJ. B., AgzarianJ., and HarrisonG. A. (1975): “Errors in Pneumotachography with Intermittent Positive Pressure Ventilation”, Anaesth. Intens. Care, 3, 284–294.
2.
Du BoisA. B., BrodyA. W., LewisD. H., and BurgessB. F. (1956): “Oscillation Mechanics of Lungs and Chest in Man”, J. Appl. Physiol., 8, 587–594.
3.
GoldschmiedF. R. (1970): “On the Frequency Response of Viscous Compressible Fluids as a Function of Stokes Number”, Trans. ASME, J. Basic Engg., 92, 333–347.
4.
GrenvikA., HedstrandU., and SjogrenH. (1966): “Problems in Pneumotachography”, Acta anaesth. Scandinav., 10, 147–155.
5.
GrenvikA., and HedstrandU. (1966): “The Reliability of Pneumotachography in Respirator Ventilation”, Acta anaesth. Scandinav., 10, 157–167.
6.
KaferE. (1973): “Errors in Pneumotachography as a Result of Transducer Design and Function “Anesthesiology, 38, 275–279.
