Poison frontman Bret Michaels will undergo surgery in January to repair a defect in his heart, his rep confirms with EW. This surgery is just the latest in a string of medical issues Michaels has dealt with this year. In April, the rocker had an emergency appendectomy, followed by a brain hemorrhage. In May he was hospitalized again with a “warning stroke.” Michaels then announced on his official website his doctors had discovered a hole in his heart, also known as Patent Foramen Ovale. The scheduled surgery will attempt to repair the PFO. His rep is unsure of the recovery time, but said Michaels should be able to promote his autobiography Roses & Thorns: The Reality of My Rock & Roll Fantasy, due out March 15.