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. ARF due to secondary lung problems such as iatrogenic pulmonary edema due to volume overload. ARF due to primary lung problems such as pneumonia, ARDS etc. From this perspective let’s classify respiratory failure broadly into 3 categories: 
For the purpose of this conversation, it is worth mentioning how we can fix respiratory failure by mechanical ventilator. In the previous post ( here) the pathophysiology and definition of respiratory failure was explored. In this pictorial post, this fundamental concept is explored! If you take nothing else from this post, you should at least follow the principles that are summarized here.
The purpose of mechanical ventilation is to support oxygenation and ventilation without further inducing lung damage that is to say sending lungs to vacation and having them rest for a while. Approach to hypoxemia & ventilator alarm.Approach to crashing patients on the ventilator.Physiology of Positive pressure ventilation.
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