Abstract: There is described a medical device (100), comprising:—an airway adaptor (212, 312) configured to be connected to an airway of a patient;—a first sensor (104, 202, 302) a configured to detect a first parameter of a space fluidly connected to the airway adaptor, the first parameter being for example an air flow rate, an air pressure, an O2 level, a CO2 level, or a humidity level;—a second sensor (104, 204, 304) configured to detect a second parameter of the space, the second parameter being for example an O2 level or an air pressure;—a display (216, 316); and-a processor (510) configured to determine a relationship between the first parameter and the second parameter, based on determining that the relationship has changed over multiple ventilations, identify a leak between the airway adaptor and the airway of the patient, generate an alert indicating the leak, and cause the display to output the alert.