Question

What is the only Mapleson that does not contain an APL valve or reservoir bag? 1) Mapleson A 2) Mapleson B 3) Mapleson C 4) Mapleson D

Answer 1

The only Mapleson system that does not have an APL valve or a reservoir bag is Mapleson C (Waters' to-and-fro system). Unlike others, it's only fit for spontaneous breathing under general anaesthesia.

Step-by-step explanation:

The Mapleson system that does not contain an

APL valve

or

reservoir bag

is

Mapleson C

. Mapleson systems are used in anesthesia, and each different version has a unique configuration of components, such as reservoir bags and APL (adjustable pressure limiting) valves. Mapleson C is also known as the Waters' to-and-fro system. Unlike others in the series, it doesn't include an APL valve or reservoir bag, and it's thus not fit for controlled ventilation, but can be used for spontaneous breathing under general anaesthesia.

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