This is 2 year old postop. patient with DDD pacemaker. What a sinking feeling one gets upon seeing this! (Absolutely no capture of either the atrium or the ventricle).
Click on the image for a larger image.
4 yr old boy, s/p Ebstein's repair with bioprosthetic valve in tricuspid valve position. Pierre Robin syndrome. Intermittent stridor. Possible vocal paralysis. (Click on the image to enlarge)