ISSN:
1432-1238
Keywords:
Key words Closed-loop controlled ventilation
;
Human
;
Initial settings
;
Computer
;
Mechanical ventilation
Source:
Springer Online Journal Archives 1860-2000
Topics:
Medicine
Notes:
Abstract Objective: To test a method that allows automatic set-up of the ventilator controls at the onset of ventilation. Design: Prospective randomized crossover study. Setting: ICUs in one adult and one children’s hospital in Switzerland. Patients: Thirty intubated stable, critically ill patients (20 adults and 10 children). Interventions: The patients were ventilated during two 20-min periods using a modified Hamilton AMADEUS ventilator. During the control period the ventilator settings were chosen immediately prior to the study. During the other period individual settings were automatically determined by the ventilator (AutoInit). Measurements and results: Pressure, flow, and instantaneous CO2 concentration were measured at the airway opening. From these measurements, series dead space (V DS), expiratory time constant M28.6n(RC), tidal volume (V T), total respiratory frequency (f tot), minute ventilation (MV), and maximal and mean airway pressure (P aw,max and P aw,mean) were calculated. Arterial blood gases were analyzed at the end of each period. P aw,max was significantly less with the AutoInit ventilator settings while f tot was significantly greater (P〈0.05). The other values were not statistically significant. Conclusions: The AutoInit ventilator settings, which were automatically derived, were acceptable for all patients for a period of 20 min and were not found to be inferior to the control ventilator settings. This makes the AutoInit method potentially useful as an automatic start-up procedure for mechanical ventilation.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01712237
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