DF Beck performed the first successful resuscitation of a physician with myocardial infarction in 1953, and pioneered the use of open-chest defibrillation. Dr. Zoll introduced external defibrillation in Boston in 1956, and Dr. Kouwenhoven and colleagues at Johns Hopkins highlighted the effectiveness of a combo of mouth-to-mouth, sternal compression, and closed chest defibrillation in restoring cardiac function in ventricular fibrillation patients. The first diagnostic angiogram was discovered by Dr. Mason Sones in 1958, due to an accidental injection of dye directly into the coronary artery rather than into the entire circulation - something that was previously believed to be fatal.