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.
To answer the question, What are duvet covers, one first has to answer, What are duvets?. A duvet is a bag filled with down, feathers, wool or other natural stuffing to create a warm bed covering that takes the place of quilts and bedspreads. Duvet is the French word for down, as in down from birds.