Performance of transport ventilator with patient-triggered ventilation

E Miyoshi, Y Fujino, T Mashimo, M Nishimura
Chest 2000, 118 (4): 1109-15

OBJECTIVES: Transport ventilators with inspiratory triggering functions and pressure support-control modes have recently become commercially available. We evaluated these ventilators in comparison with a standard ICU ventilator.

STUDY DESIGN: Laboratory study with a mechanical lung model.

METHODS: We compared the performance of four transport ventilators (model 740, Mallinckrodt, Pleasanton, CA; TBird, Bird Products Corp, Palm Springs, CA; LTV1000, Pulmonetic Systems, Colton, CA; Esprit, Respironics, Vista, CA) with a standard ICU ventilator (model 7200ae; Mallinckrodt) using a test lung that simulated spontaneous breathing (compliance, 46.8 mL/cm H(2)O; resistance, 5 cm H(2)O/L/s). The settings of ventilators were positive end-expiratory pressure (PEEP) of 0 or 5 cm H(2)O, and pressure support (PS) of 0 or 10 cm H(2)O. The settings of the test lung were inspiratory time of 1 s, respiratory rate of 10/min, peak inspiratory flow of 40, 60, and 80 L/min. To evaluate inspiratory function at each setting, we measured the inspiratory delay time (DT), inspiratory trigger pressure (P-I), and the time for airway pressure to rise from the baseline pressure to 90% of the end-inspiratory pressure (T(90%)); for expiratory function, supraplateau expiratory pressure (P-E) and the time constant (taue) for pressure decrease during exhalation were evaluated. Oxygen requirement was assessed as the time required to empty a 3.5-L oxygen tank.

RESULTS: For inspiratory triggering, four transport ventilators had DT < 100 ms, which is considered clinically satisfactory, in all the settings except for PS 0 cm H(2)O, PEEP 0 cm H(2)O, and inspiratory flow of 80 L/min with LTV1000. P-I increased only in LTV1000 when PEEP was increased from 0 to 5 cm H(2)O. taue for the transport ventilators was > 50% shorter than for the ICU ventilator except for PS 0 cm H(2)O and PEEP 5 cm H(2)O with TBird. Oxygen requirement was lowest for the Esprit, followed by the 740, LTV1000, and TBird.

CONCLUSION: The newer Food and Drug Administration-approved transport ventilators have performance indexes comparable to the ventilator currently used in ICUs and can probably be recommended for clinical use.

Full Text Links

Find Full Text Links for this Article


You are not logged in. Sign Up or Log In to join the discussion.

Trending Papers

Remove bar
Read by QxMD icon Read

Save your favorite articles in one place with a free QxMD account.


Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"