A partial re-breather mask is not typically used int he prehospital setting for oxygen administration. It is initiated for variety of reasons.
Increased metabolic demand , maintenance of oxygenation while proving anesthesia. This the most common method for home use and provide flow rate of 2 to 6 liter per minute. Allowing the delivery of oxygen while maintaining the patient's ability to utilize their mouth to talk, eat, etc.
The main purpose is treatment for patient with acute respiratory failure and those with chronic lung disease and hypoglycemia. The maintain normal hemoglobin saturation so as facilitate normal oxygen delivery to peripheral tissues.
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