Methods and systems are provided that determine whether a patient is asynchronous with a ventilator. In certain embodiments, a ventilation system may determine whether a double-triggering event has occurred between the patient and the ventilator. The ventilation system may compare a value of the patient's exhaled tidal volume to a threshold and may determine that a double-triggering event occurred if the patient's exhaled tidal volume is less than or equal to the threshold. The ventilation system may also determine a frequency of the double-triggering events. Further, the ventilation system may provide an indication of a detected double-triggering event and an indication of the frequency of double-triggering events.
