If someone stopped breathing during an asthma attack what would the doctors do for them?

VEry Dangerous. If one were to stop breathing during an asthma attack then very aggressive invasive procedures would be done to save that persons life. Most likely that person would be inutubated, have a breathing tube placed in their airway, so that they could be mechanically ventilated. Depending upon others clinical conditions of pt more maneuvers would be done as well.
See below. Breath for them by using artificial respiration of which there are many methods.