Acoustic Method to Estimate the Longitudinal Area Profile of Endotracheal Tubes

American Journal of Respiratory Critical Care Medicine, 1994 Authors: C. Van Surell, B. Louis, F. Lofaso, L. Beydion, L. Brochard, A. Harf, J. Fredberg, and D. Isabey Conclusion: “This study has demonstrated the feasibility of the acoustic reflection method in the intensive care unit and that the decrease in hydraulic diameter and the change in…

Pharyngometer Studies, Related to Endotracheal Intubation

Pulmonary Airway Area by the Two-microphone Acoustic Reflection Method

Journal of Applied Physiology, 1994 Authors: B. Louis, G. M. Glass, and J. J. Fredberg Conclusion: “In summary, we have shown that the two-microphone method permits accurate measurement of human pulmonary airway area of breathing subjects. We established a high-pass filter signal- processing method that lessened artifacts associated with nonrigidity. This is important because it…

Pharyngometer Studies, Related to Measurement of Airway