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).
One of the most common methods for gaining central venous access in emergency situations is via femoral vein cannulation. The technique of accurately placing a femoral vein catheter depends on appropriate patient selection and a sound knowledge of anatomy. As with most other central venous cannulations, the modified Seldinger technique is used.