ABSTRACT
The purpose of the cardiovascular system is perfusion, supplying cells with oxygen and glucose needed for normal anaerobic metabolism (energy) and removing metabolic waste (carbon dioxide, metabolic acids, water). Without perfusion, cells die. Haemodynamic monitoring therefore aims to indicate perfusion. Generally, more invasive modes provide more information, but create more problems/risks. Options chosen therefore depend on balancing benefits against burdens. Monitoring equipment is diagnostic, not therapeutic, so once risks outweigh benefits or maximum time limits are reached, they should be removed.
