MY mother of 73, who was just put on lisinopril and had a pace ma...

MY mother of 73, who was just put on lisinopril and had a pace maker put in do to heart rate of 38per minute. She was also coded and we were kicked out of the room when her heart rate dropped past 7. A emergency pace maker was put in ...then her permanent one followed 2 days later. She was released from the hospital on Sat. the 21st and since she has been home, she cant sleep properly and when she does she wakes up gasping for air. Could this be a cause of the drug? lack of the oxygen that she was on in the hospital? We have put a call into the doctor, but still haven't heard a replay....wondering if anyone can give us some info...Thanks