“…Erosion events associated with the ASO device have occurred at the roof of the right or left atrium or at the atrial junction with the aorta, causing hemopericardium, tamponade or aortic fistula [3–26]. The reasons for erosion are unknown, but several risk factors have been proposed, all of which increase the chance of contact between the device and the atrial wall: absent or deficient superior–anterior rim [4, 6, 9, 16, 17, 20–22, 24–26], device‐sizing (over‐sizing [6, 13, 20, 22, 24, 25] vs. under‐sizing [9]), both of which predispose toward contact of the device with the aortic root [3, 6, 9, 25]; and/or device‐straddling of the aorta (presence [4, 18] versus absence [10]). Early risk factors have also been proposed such as deformation of the device at the aortic root at 24 h and early pericardial effusion [24].…”