🔗 When fully opened the APL valve maintains a pressure of around 1.5 cm of H2O
🔗 As we close the APL valve, the pressure builds up inside and there is a safety overpressure release valve is incorporated in modern APL valves, to avoid this rising to dangerous levels. This system starts opening at a pressure of 30 cm of H2O and fully opens at 60 cm of H2O and at this point, allows the gases to escape at a rate of 50L/ min
🔗 When the patient inspires, the APL valve , if intact, should not allow entrainment of air from the environment
🔗As the modern reservoir bags are less compliant, compared to the older latex ones, the importance of overpressure relief valves has increased
🔗 As the APL valve will always produce a small resistance to expiration, even when maximally loosened, it helps to maintain PEEP
#Anesthesia , #Anaesthesia
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