Do shorter door-to-balloon (D2B) times impact outcomes in STEMI, if it's already less than 90 minutes, and to what degree (i.e., 30 vs 60 minutes would have a more significant impact)?  

No. Shorter door-to-balloon times have not been shown to improve survival or outcomes in STEMI. The reason is that the other variable is the time from the onset of chest pain to presentation to a medical facility. This time is beyond the control of the medical system. For example, a patient waits 4 ...