65-year-old Robert B. has a history of chronic stable angina…

65-year-old Robert B. has a history of chronic stable angina and was admitted to the hospital two days ago for observation for an unrelated urology problem. This afternoon Dr. Snow tried to do a minor procedure in the patient’s room.  During the procedure he administered IV atropine. Dr. Snow calls you into the room in a panic because Robert is now clutching his own chest and crying out, “Ah!  My normal angina chest pain is back but it is much worse; I feel like an elephant is crushing my chest!  This moron Dr. Snow says gave me the normal pill I use when I have my angina pain but it didn’t help!  I’m dying!  Get me a real doctor!”   A.  What is Robert B.’s current acute problem?