![]() ![]() Not surprisingly, if you increase the tidal volume, the airway pressures will rise for a given lung compliance.This implies that in a given system volume and pressure are interrelated (if you increase the volume, the pressure will rise and vise versa).P = V/C (whereas P = pressure, V = volume, C = compliance).There are 3 basic physiologic concepts which are essential and you should digest it otherwise the whole discussion looks alien to you! I:E ratio: Is the ratio of time spent in inspiration relative to expiration.V tot(on the upper bar): is the minute ventilation that is actually being delivered.V TE(on the upper bar): Is the tidal volume that is actually being delivered.The time that is spent per each breath for inspiration PEEP: Airway pressure maintained during the expiratory phase.Minute ventilation = respiratory rate × tidal volume.Tidal volume (V T): The volume of gas delivered during each breathing cycle. ![]() The measure for ventilation is PaCO 2 which is obtained from ABG (or VBG).The measure for arterial oxygenation is (PaO 2: FiO 2).In the context of mechanical ventilation, it seems wise to envision respiratory failure as two big problems. Moreover it may not fix certain pulmonary conditions either. ![]() Obviously ventilator does not fix non-pulmonary causes of ARF. ARF due to non-pulmonary causes such as diabetic ketoacidosis etc. ![]()
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