It's performed to correct single ventricle birth defect. The normal heart has fours chamber - two upper atria and two lower ventricles. With single ventricle there is either a comlpete absence of a second ventricle or it is underdeveloped. Cauterization creates a second ventricle or enlarges a poorly developed one. Source(s): I'm a nurse.
Trivet definition, a small metal plate with short legs, especially one put under a hot platter or dish to protect a table. See more.
Countersunk head rivets are used to join work-piece materials together where the head of the assembled rivet will be flush with the top of the work piece. Countersunk head rivets are also used to hold friction materials to brake shoes.