Need some help prepping for the live chat with Dr. Petar Denoble on Nov. 8 at 6 p.m. ET to discuss patent foramen ovale (PFO)? Read "PFO and Decompression Illness in Recreational Divers" (Alert Diver | PFO and Decompression Illness in Recreational Divers ), "Divers With Holes in Their Hearts" (Alert Diver | Divers with Holes in their Hearts), and "Study Update: PFO" (http://ow.ly/eJs9a). To learn more about DAN's study on PFO, click here: Diving Medical Research Projects. Bring your questions to the PFO chat room here on ScubaBoard!