The new surgeon states they used Adriamycin to 'spike' the new heart. Adriamycin is a chemotherapeutic agent that is red in color. The syringe that Sam hands to Jack is filled with a clear and colorless liquid, however, the new surgeon was merely speculating what might have been used.
Clay's heart shows an asystole on the EKG monitor, yet the surgeon yells "V-Fib" (Ventricular Fibrillation) and calls for the defibrillator, clearly he is not in Ventricular Fibrillation but in asystole, and asystole i.e. non-beating heart, cannot and must not be defibrillated.
In the flashback where Clay is initially rushed to the ER, Dr. Harper says 'We have a massive heart attack, possible MI'. MI is an abbreviation for myocardial infarction which is commonly known as a heart attack.
Dr. Jack Harper: At 6:32 this morning, on Thursday the first of November, Clayton Beresford Junior died on my operating table, two and a half hours later, his life was saved.