These days, more hospitals are moving from Ethernet to Wi-Fi because of the rapid growth of mobile devices that use wireless connectivity. Who needs to be wired into a wall when you're carrying around a tablet PC or pushing a "computer on wheels" through the halls of a hospital?
Many smaller, lighter, thinner computers like the Apple MacBook Air and most of the Windows 8 tablet PCs don't have Ethernet ports on them. Who wants to carry around an Ethernet USB adapter? Switched Ethernet is an Ethernet LAN that uses switches to connect individual hosts or segments.