The Science Journal of the American Association for Respiratory Care

1996 OPEN FORUM Abstracts

COMPARISON OF CARDIORESPIRATORY VARIABLES DURING WEANING USING THE TBIRD AND 7200AE

Richard Branson RRT, Robert Campbell RRT, Ken Davis Jr. MD, Fred Luchette MD, Jay Johannigman MD. Department of Surgery, University of Cincinnati, Cincinnati, Ohio.

Background: Ventilatory support in sub-acute care has become more common and more sophisticated as a method of cost reduction. Current portable ventilators are small, simple, and inexpensive yet lack demand valves, monitoring, and PSV. Current ICU ventilators allow necessary functions, but are large, expensive, and complicated. Purpose: To compare a new portable ventilator with a built-in gas source, capable of PSV and flow triggering to an established ICU ventilator.

Methods: Thirty patients (21 men, 9 women, mean age 42 (14) yrs) ventilated for a mean duration of 16 (5) days were studied. Ventilator settings were SIMV RR = 4 (2), PEEP = 6 (1), FIO_{2} = 0.37 (0.06), PSV = 14 (4) cm H_{2}O and V_{T} = 0.71 (0.16). Patients were ventilated with a TBird or 7200ae ventilator in random sequence at identical ventilator settings for a period of 4 hrs. Cardiorespiratory variables were monitored continuously by bedside monitors (BiCore CP-100 with variable orifice flow transducer and Sirecust). Every 30 mins spont. V_{T}, spont. RR, and V_{E} were recorded. Arterial blood gases were drawn and analyzed every 2 hr. Data are shown below mean (SD). Data were analyzed by ANOVA and a p < 0.05 was significant.

2 Hr 4 Hr

TBird 7200ae TBird 7200ae

f spont (RR) 13(6) 15(8) 15(6) 16(8)

V_{T}spont (L) .37(.19) .37(.15) 40(.17) .36(.14)

V_{E}(L/min) 8.5(2.4) 9.1(2.1) 8.7(2.1) 9.1(2.5)

PaO_{2}(torr) 78(11) 83(14) 85(12) 80(10)

PaCO_{2}(torr) 42(6) 44(7) 43(5) 45(8)

Results: There were no significant differences between measured variables. Patients appeared comfortable using both ventilators. There were also no changes in hemodynamic variables. Conclusion: In this setting, the TBird provided ventilatory support equivalent to the 7200ae. The TBird appears to meet the needs of the sub-acute care facility, combining portability and built-in gas source with responsive triggering and pressure support.

Reference: OF-96-161

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