Boston Scientific Corp., the second-biggest cardiac-device maker, fell in early trading after fourth-quarter earnings plummeted 55 percent. Boston Scientific declined 3.6 percent to $5.87 at 8:30 a.m. Net income dropped to $107 million, or 7 cents a share, from $236 million, or 15 cents a share, a year earlier, the Natick-based company said. Demand for defibrillators to restart a stopped heart ...