Tidal volume: Volume of air moved in and outside the lungs in each respiratory cycle.įiO2: Percentage of oxygen in the air mixture that is delivered to the patient.įlow: Speed in liters per minute at which the ventilator delivers breaths.Ĭompliance: Change in volume divided by change in pressure. For a full description of the use of PEEP, please review the article titled “Positive End-Expiratory Pressure (PEEP).” ![]() PEEP: The positive pressure that will remain in the airways at the end of the respiratory cycle (end of exhalation) is greater than the atmospheric pressure in mechanically ventilated patients. In a mechanically ventilated patient, this can be achieved by increasing the fraction of inspired oxygen (FiO 2%) or the positive end-expiratory pressure (PEEP). Oxygenation: Interventions that provide greater oxygen supply to the lungs, thus the circulation. In a mechanically ventilated patient, the CO2 content of the blood can be modified by changing the tidal volume or the respiratory rate. Ventilation is measured as minute ventilation in the clinical setting, and it is calculated as respiratory rate (RR) times tidal volume (Vt). Its most important effect is the removal of carbon dioxide (CO2) from the body, not on increasing blood oxygen content. Ventilation: Exchange of air between the lungs and the air (ambient or delivered by a ventilator), in other words, it is the process of moving air in and out of the lungs. ![]() It is imperative to understand some basic terms to understand mechanical ventilation. The need for mechanical ventilation is one of the most common causes of admission to the intensive care unit.
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