Ebook Monitoring mechanical ventilation using ventilator waveforms: Part 2
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Ebook Monitoring mechanical ventilation using ventilator waveforms: Part 2
Chapter 4Assisted and SpontaneousModes4.1Pressure Support4.1.1Normal CurvesThe mode called pressure support is a particular type of PC in which all br Ebook Monitoring mechanical ventilation using ventilator waveforms: Part 2reaths are spontaneous (i.e., patient triggered and patient cycled). The pressure may be shaped by an adjustable pressure rise time setting. The subsequent inspiratory flow depends on the inspiratory time constant and the patient's inspiratory effort. Inspiration stops when the set cycle threshold i Ebook Monitoring mechanical ventilation using ventilator waveforms: Part 2s reached (expiratory trigger sensitivity). The cycle threshold is set as a percentage of the peak inspiratory flow. The point at which the cycle threEbook Monitoring mechanical ventilation using ventilator waveforms: Part 2
shold is reached depends on the inspiratory time constant; hence cycling is a patient-initiated event, even if inspiration is entirely passive after tChapter 4Assisted and SpontaneousModes4.1Pressure Support4.1.1Normal CurvesThe mode called pressure support is a particular type of PC in which all br Ebook Monitoring mechanical ventilation using ventilator waveforms: Part 2lementary material, which is available to authorized users.IA OA I 0182 Chapter 4. Assisted and Spontaneous ModesAll of the statements regarding pressure support are true except'.1The inspiratory trigger event is visible on the pressure curve2The inspiratory flow is variable depending on patient ins Ebook Monitoring mechanical ventilation using ventilator waveforms: Part 2piratory effort3The inspiratory time is preset4The expiratory cycle threshold is based on flow5The respiratory rate is controlled by the patient4.1 PrEbook Monitoring mechanical ventilation using ventilator waveforms: Part 2
essure Support 834.1.2Inspiratory TriggerThe patient's inspiratory effort is detected as a deformation of the pressure or flow waveform. Pressure trigChapter 4Assisted and SpontaneousModes4.1Pressure Support4.1.1Normal CurvesThe mode called pressure support is a particular type of PC in which all br Ebook Monitoring mechanical ventilation using ventilator waveforms: Part 2reases and flow is zero. With flow triggering. a continuous bias flow is maintained through the ventilator circuit. When the patient generates an inspiratory effort, a fraction of the base flow deviates to the patient. The drop in expiratory flow below the base flow is the signal for triggering insp Ebook Monitoring mechanical ventilation using ventilator waveforms: Part 2iration. During the pre-trigger phase, airway pressure decreases and flow increases slightly.Inspiratory trigger:1Is indicated by an increase in pressEbook Monitoring mechanical ventilation using ventilator waveforms: Part 2
ure before the mechanical breath2Is not visible on the pressure curve if a flow trigger is used3Always increases flow at initiation of patient’s efforChapter 4Assisted and SpontaneousModes4.1Pressure Support4.1.1Normal CurvesThe mode called pressure support is a particular type of PC in which all br Ebook Monitoring mechanical ventilation using ventilator waveforms: Part 2chanism84 Chapter 4. Assisted and Spontaneous Modes4.1.3Trigger EffortThe patient's effort to trigger a breath is indicated by the depth of the pressure deflection below the baseline, and the time during which the pressure remains below the baseline. The depth of the pressure deflection can be more Ebook Monitoring mechanical ventilation using ventilator waveforms: Part 2negative than the set trigger pressure if the patient has a strong respiratory drive.A deep deflection in pressure during the triggering phase indicatEbook Monitoring mechanical ventilation using ventilator waveforms: Part 2
es all these except'.1An inadequate trigger sensitivity setting2The need to increase pressure support3Patient-ventilator asynchrony4The need to use a Chapter 4Assisted and SpontaneousModes4.1Pressure Support4.1.1Normal CurvesThe mode called pressure support is a particular type of PC in which all brChapter 4Assisted and SpontaneousModes4.1Pressure Support4.1.1Normal CurvesThe mode called pressure support is a particular type of PC in which all brGọi ngay
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