Nasal cannula systems and methods

A nasal interface assembly comprising:

• a nasal interface comprising:
• a pillow body comprising a nasal pillow having an pillow opening and a pillow cavity that extends from the pillow opening into the nasal pillow, wherein the nasal pillow is configured to engage a nose to fluidly couple the pillow cavity with a nostril of the nose;
• a cannula body comprising a prong coupled to the pillow cavity, wherein the prong is configured to direct a gas out of the cannula body;
• a pressure monitoring port comprising a pressure passage in fluid communication with the pillow cavity, wherein a portion of the pressure passage is formed between the nasal pillow and the prong;
• and
• a pressure relief port coupled to the pillow cavity;
• and
• a gas supply line fluidly coupled to the cannula body;
• and
• a pressure sense line fluidly coupled to the pressure monitoring port.