The Science Journal of the American Association for Respiratory Care

2005 OPEN FORUM Abstracts

EVALUATION OF POSITIVE END-EXPIRATORY PRESSURE DURING VOLUME-TARGETED ASSIST-CONTROL VENTILATION

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

Background: During volume-targeted assist-control, the positive end-expiratory pressure (PEEP) should remain constant. At a set PEEP of 5 cm H2O, the PEEP should remain at 5 cm H2O. The positive pressures were evaluated on the Newport HT 50 and the 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. PEEP was the average of a minimum of five breaths, while CST and RAW was changed.

Results: At CST of 20: PEEP with the LTV 1000 was 4.9, 4.8, 4.8 cm H2O with RAW 5, 15, 25; PEEP with the HT 50 was 0.9, 2.5, 6.6 cm H2O with RAW 5, 15, 25. At CST of 40: PEEP with the LTV 1000 was 5.0, 5.0, 4.8 cm H2O with Raw 5, 15, 25; PEEP with the HT 50 was 2.2, 6.9, 5.6 cm H2O with RAW 5, 15, 25. At CST of 60: PEEP with the LTV 1000 was 4.6, 4.8, 4.9 cm H2O with Raw 5, 15, 25; PEEP with the HT 50 was 4.3, 5.0, 4.8 cm H2O with RAW 5, 15, 25. At CST of 80: PEEP with the LTV 1000 was 4.9, 4.9, 4.9 cm H2O with Raw 5, 15, 25; PEEP with the HT 50 was 4.3, 4.5, 5.1 cm H2O with RAW 5, 15, 25.

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

You are here: RCJournal.com » Past OPEN FORUM Abstracts » 2005 Abstracts » EVALUATION OF POSITIVE END-EXPIRATORY PRESSURE DURING VOLUME-TARGETED ASSIST-CONTROL VENTILATION