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Trigger sensitivity of Servo 300 (Siemens Elema) for pressure support ventilation in an infant
Author(s) -
MORI N.,
SUZUKI M.
Publication year - 1994
Publication title -
pediatric anesthesia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.704
H-Index - 82
eISSN - 1460-9592
pISSN - 1155-5645
DOI - 10.1111/j.1460-9592.1994.tb00118.x
Subject(s) - medicine , ventilation (architecture) , anesthesia , mean airway pressure , respiratory minute volume , sensitivity (control systems) , peak inspiratory pressure , airway , signal (programming language) , intermittent mandatory ventilation , pressure support ventilation , tidal volume , mechanical ventilation , cardiology , respiratory system , mechanical engineering , electronic engineering , computer science , engineering , programming language
Summary The trigger sensitivity for pressure support ventilation (PSV) with a Servo 300 ventilator was evaluated in a 6‐month‐old male infant ventilated with synchronized intermittent mandatory ventilation (SIMV) of 14 c.min −1 and PSV of 4 cmH 2 O. The delay time between onset of inspiration and the trigger signal was 42 and 139 msec for trigger sensitivity of –2 and –4 cmH 2 O, respectively. On the former sensitivity, the inspiration was sensed by a decrease of expiratory bias flow before the airway pressure decreased to the set level. The time between the trigger signal and the flow delivery was 7 msec. The supplied volume exceeded the spontaneous breath on both trigger sensitivities. Using Servo 300, the constant expiratory bias flow, the use of a flow trigger and the mechanical improvement of the inspiratory valve contribute to reduced delay time in the trigger function, making the ventilator well suited, set in the PSV mode, even at high spontaneous respiratory rates for infants.