Our Pediatrian says one treatment every 3/4 hours. Our pulmonoligist/Allergist disagrees saying Xopenex - 2 Puffs/2 Nebulizer treatments every 20 minutes for the 1st hour. Then next treatment every 1-2 hours as needed. We explained this to the Pediatrician and they said that was very dangerous and could promote heart problems. Please advise