your patient is to recieve morphine sulfate 4mg IVPB for breakthrough pain q2hrs prn. The patient is on continous mophine drip at 4mg/hr from a peripherial inserted central catheter (picc) line, with a morphine sulfate concentration of 50mg in 50ml. over an 8hr shift the patient receives three PRN doses. What is the total mg of morphine sulfate the patient received for the shift?