Dr. John Flack, chairman of Wayne State University \'s department of internal medicine, commented about Rheos, an experimental device designed to work like a pacemaker for controlling blood pressure. The tiny generator device is implanted into a person's chest and two electrodes are placed on both sides of their neck. Observing a patient's systolic blood pressure decrease from 240 to 208 as the device is activated, Flack, the study\'s principal investigator, said that in two to three months, she'll really start seeing an impact.