MEDICAL THRILLER from award-winning author.        In the pre-dawn hours of the graveyard shift, the ICU at the Houston Heart Institute is quiet, and quietly patients are dying. Surgery resident Joe Morales dreams of becoming a rich heart doctor. First, he must survive his assignment to an ICU rife with land mines--unexplained patient deaths, rival faculty, fellow resident saboteurs, a cost-slashing administrator, a ruthless insurance executive, a seductive head nurse, a jealous wife, a critically ill son, an overprotective mother, and an orderly distraught over his daughter's death. To salvage the career he thought he wanted, Joe must determine the cause of the suspicious deaths. In the process, he's forced to re-examine the ethnic and religious heritage that he had rejected.         R. B. O'Gorman obtained a PhD in Biochemistry from Rice University and studied cardiovascular surgery under Dr. Michael E DeBakey. FATAL RHYTHM is a medical suspense/mystery based on his training experience with Micahel E. DeBakey, called the "greatest surgeon ever."