Tests results indicate Bret Michaels has a lack of sodium in his body that leads to seizures, according to a message posted Tuesday on the website of the glam rock-reality TV star. The condition, called hyponatremia, is a side effect of a brain hemorrhage that has left the Poison frontman in intensive care at an undisclosed hospital. The tests also found the 47-year-old Michaels suffered a type of stroke that causes bleeding in the fluid-filled spaces around the base of the brain. Michaels' New York-based publicist Joann Mignano provided a written statement confirming the Web posting. The message said doctors are hopeful Michaels will gradually improve as the blood surrounding the brain dissolves and is reabsorbed into his system. 