Hi Angie Grunewald
Welcome to HealthcareMagic.
We are sorry about your son`s situation.
It is important to know why his heart rate
has dropped .As you are in ER , I hope specific treatment must be going on .If not you can request the Incharge Doctor to do so.
If you can elaborate your son`s history , sequence of events , we can help you know what is wrong with him.
You can provide these details as comment to this reply or feel free to mail me.