When my son was a toddler he was hospitalized and coma was induced, his lung collapsed and it cause his heart to stop... but prior to this they diagnosed him with asthma, he was prone to phenomena and other things. They put him on a nebulizer and gave me instructions to lay him face down and lightly pound on his back where his lungs are like I were using bongos, to help break up any fluid build up and congestion .. can you tell me what this is called?