1 Idiopathic cyclic edema â This is a condition in which one leg swells in correlation to the menstrual cycle.  AV fistula â An AV fistula can be post-trauma or congenital. An AV fistula of the femoral artery can cause a swollen leg that is warm and with prominent veins. It can cause systemic symptoms of heart failure.
A network video recorder (NVR) is a software program that records video in a digital format to a disk drive, USB flash drive, SD memory card or other mass storage device.ideo on a DVR is encoded and processed at the DVR, while video on an NVR is encoded and processed at the camera, then streamed to the NVR for storage or remote viewing. Hybrid NVR/DVR security systems exist which incorporate functions of both NVR and DVR; these are considered a form of NVR.
Quite simply, DVR stands for Digital Video Recorder, which CAN include network cameras, and in fact, a system with ONLY network cameras is also a DVR; NVR is simply a more specific term to indicate that the system is network-only with no analog capture hardware.eing strictly semantic, a NVR is a DVR... however, the important difference to remember is that you need a DVR if you have or plan to use standard analog cameras * , or an NVR if you're using network (IP) cameras (since the N stands for Network).