Association of Preoperatively Diagnosed Patent Foramen Ovale With Perioperative Ischemic Stroke. Categories: Perioperative Stroke Author: Bhatt DL, Burns SM, Eikermann M, Friedrich S, Herisson F, Houle TT, Med C, Ng AK, Ng PY, Rudolph MI, Scheffenbichler F, Subramaniam B, Timm FP