A pilot study of respiratory inductance plethysmography as a safe, noninvasive detector of jet ventilation under general anesthesia.

摘要: BACKGROUND: High-frequency jet ventilation is an optimal mode of for many surgical procedures the trachea and larynx but has limited monitoring modalities to assess adequacy oxygenation and/or ventilation. Respiratory inductance plethysmography a noninvasive monitor chest abdominal wall movement with well-established applications in sleep laboratory. We performed observational pilot study respiratory as detector METHODS: Twenty-five patients underwent microdirect suspension laryngoscopy high-frequency under general anesthesia total IV anesthesia. Inductotrace ® bands (Ambulatory Monitoring Inc., Ardsley, NY) were applied abdomen all data collected from oxygen administration through emergence at 50-Hz sampling frequency DC using 12-bit A-D converter custom programmed LabVIEW interface. The raw filtered was developed based on type I, IIR peak comb filter differentiate apnea, cardiogenic oscillations, ventilation-associated excursion. primary end point ability identify presence Receiver operating characteristic curves generated aggregate patients. RESULTS: reliably detected analysis program effectively extracted relatively small amplitude signal baseline contaminated by noise. Sensitivity range 85%, bandwidth 0.055 Hz. Increased sensitivity increasing offset detection delay 12.5 seconds. CONCLUSIONS: successfully used detect undergoing laryngotracheal surgery. This demonstrates feasibility use during