A PFO closure is a procedure that can help lower the risk of a stroke for some people. Your doctor used a thin, flexible tube called a catheter to place a small device that closes the PFO.Patent foramen ovale (PFO) is a hole between the left and right atria (upper chambers) of the heart. This hole exists in everyone before birth. For children needing treatment for a PFO, we use cardiac catheterization to close the defect with a small device. Through the catheter, the cardiologist will thread a small PFO closure device into your heart and place it in the hole to seal it closed. It has been demonstrated that the prevalence of deep venous thrombosis (DVT) and venous thromboembo- lism (VTE) significantly increases in the elderly4.