For example, a certain maize variety grown in a cool climate will need less water per day than the same maize variety grown in a hotter climate. It is therefore useful to take a certain standard crop or reference crop and determine how much water this crop needs per day in the various climatic regions.
An implantable cardioverter defibrillator (ICD) looks very similar to a pacemaker, except that it is slightly larger. It has a generator, one or more leads, and an electrode for each lead. These components work very much like a pacemaker.
Pacemaker Procedure. Pacemakers are most often needed for children with a type of arrhythmia in which heart rhythms are too slow. It is a device that follows your child's heart beat and makes sure it doesn't fall below a certain rate. The procedure to implant a pacemaker usually requires at least a 24-hour hospital stay.