Adjustably controlling rescue or assisted breaths

An overinflation and/or overventilation device, the device comprising:

• an inlet configured to receive a manual resuscitation gas source;
• an outlet configured to receive a resuscitation interface;
• and
• a body portion including a subject metric input component and a volume control mechanism, wherein the subject metric input component is configured to move the volume control mechanism based on a user input to achieve a portion of a gas volume received at the inlet that is delivered at the outlet.

A method for manual resuscitator assembly operation involving adjustably controlling rescue or assisted breaths provided during manual resuscitation to prevent overinflation and/or overventilation, the method comprising:

• receiving input specifying a metric associated with a resuscitation subject via a subject metric input component disposed at a device, the device being disposed between a manual resuscitation gas source and a resuscitation interface by an inlet port of the device being attached to the manual resuscitation gas source and an outlet port of the device being attached to the resuscitation interface such that a portion of gas of a rescue or assisted breath provided during manual resuscitation is communicated from the manual resuscitation gas source via the inlet port to the resuscitation interface via the outlet port;
• controlling a volume of the portion of gas of the rescue or assisted breath provided during manual resuscitation that is communicated through the outlet port based on the metric received by the subject metric input component;
• and
• providing an indication to a healthcare provider performing manual resuscitation to convey a time period between rescue or assisted breaths.