I'll start beating the war drums and sending smoke signals. You put on your best war paint! We can't be there in person, but you know we're standing beside you in spirit!
"Busy" is not acceptable. Make that the first order of business. Tell her you and Puzzle will wait while she calls the cardiologist. Plan B: get the name and telephone number of the cardiologist and call them yourself, every day, without fail. Ask for the practice manager, office manager, whomever can get you those results! Ugh! There is something wrong with this picture!!!