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- Title
Evaluation of performance of two high-frequency oscillatory ventilators using a model lung with a position sensor.
- Authors
Iguchi, Naoya; Hirao, Osamu; Uchiyama, Akinori; Mashimo, Takashi; Nishimura, Masaji; Fujino, Yuji
- Abstract
Purpose: High-frequency oscillatory ventilation (HFOV) is thought to protect the lungs of acute respiratory distress syndrome (ARDS) patients. The performance and mechanical characteristics of high-frequency oscillatory ventilators, especially with regard to delivering appropriate tidal volume ( V) to compromised lungs, might affect the outcome of patients. We evaluated the performance of two such ventilators using a model lung with a position sensor. Methods: We tested the Metran R100 and SensorMedics 3100B. V was measured using the model lung with the compliance set at 20 or 50 ml/cmHO and the resistance at 0 or 20 cmHO/l/s. Oscillator frequency was set at 5, 7, and 9 Hz, and amplitude was set at 25%, 50%, 75%, and 100% (100% being maximum amplitude available at each setting configuration). Results: At each model lung setting, R100 delivered greater V at 5 Hz. V differences between the ventilators decreased as frequency increased and were negligible at 9 Hz. At each model lung setting and frequency, as amplitude increased from 25% to 100%, V increased proportionally more with R100. With an I:E ratio of 1:1, 3100B delivered greater V than with 1:2. Conclusion: Because it is able to deliver comparably greater V, R100 may be a better choice for HFOV in critical ARDS patients. Better proportionality may be a result of more effective amplitude titration for adjusting PaCO during oscillation.
- Subjects
HIGH-frequency ventilation (Therapy); ADULT respiratory distress syndrome; MECHANICAL ventilators; VOLUMETRIC analysis; LUNGS
- Publication
Journal of Anesthesia, 2010, Vol 24, Issue 6, p888
- ISSN
0913-8668
- Publication type
Article
- DOI
10.1007/s00540-010-1032-0