The Science Journal of the American Association for Respiratory Care

2005 OPEN FORUM Abstracts

EVALUATION OF DELIVERED VOLUME DURING VOLUME-TARGETED ASSIST-CONTROL ON THE PULMONETICS LTV 1000 AND NEWPORT HT 50

Ty Barnett, Alyssa Rowe, Coby Steele, Lonny Ashworth MEd RRT, Boise State University, Boise, ID.

Background: During volume-targeted assist-control, the tidal volume (VT) should remain constant. At a set VT of 800 mL, the delivered volume should remain at 800 mL. The delivered volume was evaluated on the Newport HT 50 and Pulmonetics LTV 1000.

Method: Each ventilator was connected to the Hans Rudolph Breathing Simulator (HR 1101). HR 1101 settings: resistance (RAW) 5, 15, 25 cm H2O/L/sec; compliance (CST) 20, 40, 60, 80 mL/cm H2O. HT 50 and LTV 1000 settings: Rate 8/min; tidal volume 800 mL; PEEP 5 cm H2O; TI 1.0 sec. Delivered volume was the average of a minimum of five breaths, while CST and RAW were changed.

Results: At CST of 20: VT with the LTV 1000 was 781.8, 764.7, 759.4 mL with RAW 5, 15, 25: VT with the HT 50 was 889.6, 879.9, 810.0 mL with RAW 5, 15, 25. At CST of 40: VT with the LTV 1000 was 786.2, 779.7, 780.0 mL with RAW 5, 15, 25: VT with the HT 50 was 916.8, 825.9, 785.7 mL with RAW 5, 15, 25. At CST of 60: VT with the LTV 1000 was 799.7, 793.8, 787.0 mL with RAW 5, 15, 25: VT with the HT 50 was 832.4, 781.4, 766.3 mL with RAW 5, 15, 25. At CST of 80: VT with the LTV 1000 was 791.6, 789.8, 791.3 mL with RAW 5, 15, 25: VT with the HT 50 was 873.5, 782.4, 766.3 mL with RAW 5, 15, 25.

Conclusion: The ability of a ventilator to maintain the desired tidal volume during volume-targeted ventilation varies depending upon the ventilator, and the patient's compliance and resistance. Tidal volumes should be monitored closely while ventilating patients in volume-targeted ventilation.

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