a. Self-inflating bags. May be used without an oxygen or airflow source, but some varieties contain a valve that prohibits free flow of oxygen unless positive pressure is delivered via the bag.

b. Flow-inflating bags (also known as anesthesia or Mapleson circuits). Require an oxygen or air source to inflate the bag, and allow continuous administration of oxygen even when positive pressure is not applied. These systems also allow a better feel for lung compliance, although they can be technically more difficult to use.

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