Prayer needed for my Grandpa

This morning while Preaching, my grandpa started having heart pains again, at that time he stopped and took his nitro pills, He asked my dad to take him to the hospital, So my dad went to let my grandma(who was teaching the Jr Church class) know what they were doing.. and when my dad came back my grandpa has collapsed and someone had already called 911.. So grandpa was taken to the hospital by ambulance, Dad and Grandma are with him.. They still have him in the ER.. I haven't heard much more except he is stable