1 1902 Willis Haviland Carrier invented the first air conditioner to control the temperature and humidity of a printing company, marking the first time effort taken to control the temperature of the surroundings. 2  This starts the history of air conditioning.
Following the introduction and widespread use of central venous catheters (CVCs) in adult patients, these devices are now frequently used also in the pediatric population. They have become an indispensable route for venous access, especially in pediatric intensive care units (PICUs).
The tunnelled central venous catheter is placed in the operating room while the person is under general anesthesia. The doctor makes 2 small cuts (incisions) in the skin. One cut is made over the vein where the catheter will enter the body. The other cut is made where the catheter will come out of the skin.