An emergency aspirator can save lives. It can also be intimidating to patients, and first responders may be reluctant to use the device in the absence of clear indications. There is no reason to deny or delay suction to a patient who shows an obvious need. So when should you use an emergency aspirator? The short answer is that an emergency aspirator may be appropriate any time there is any sort of airway obstruction. Here are some of the most common usage indications.