PB840呼吸机的使用概要1.ppt

* * * * * * * * * * * * 22 22 22 22 22 Spontaneous breathing while on a ventilator has often been associated with imposed work of breathing and patient ventilator synchrony problems. The work to initiate a breath is only the first part of the total work a patient must expend during spontaneous or assisted efforts. Effective breathing coordination between patient and ventilator output requires careful attention to four additional distinct elements of a pressure based breath, especially when patient efforts or fighting are present. The first is (A) the work to trigger, followed by (B) the rise to pressure, (C) pressure overshoot and sustaining the breath, and ( D) transition to expiration. The 840 is superior over all of our competition in our ability to provide patient ventilator synchrony. * 21 21 * * * * * * 34 34 34 34 34 18 Most ventilators currently on the market today terminate the inspiratory phase in Pressure Support Ventilation (PS) according to set termination criteria. This criteria is usually a percent of the peak flow for that particular breath. Clinicians have been limited in the past due to the inability to adjust this termination criteria. Expiratory Sensitivity (ESENS) defines the percentage of the projected peak inspiratory flow (VMAX) at which the ventilator terminates flow and thus cycles from inspiration to expiration during spontaneous breathing. A fixed PS termination criterion may potentially result in several clinical issues. If inspiratory flow terminates too early, it can lead to a decreased tidal volume, or increased inspiratory muscle load if the patients inspiratory effort persists after the ventilator has cycled flow off. Conversely, if inspiratory flow persists beyond patient effort which may happen when leaks are present, it can result in unnecessary expiratory work and patient/ventilator dysynchrony. * 34 34 34 34 34 18 Most ventilators currently on the market today terminate the inspiratory phase in Pressure Support Vent