Endotracheal tubes are usually made from silicone, polyvinyl chloride (PVC) plastic or red rubber.

Every cell in the body needs a constant supply of oxygen to produce energy to grow, repair or replace itself and to maintain normal vital functions.

Blood pressure is the driving force for blood flow (perfusion) through capillaries that supply oxygen to organs and tissue beds of the body.

Cardiovascular monitoring of patients under anesthesia is necessary so that potentially harmful changes in the function of the cardiovascular system can be recognized and appropriate action can be taken.