swelling and pain in both legs weeks after angiogram , had ultrasound not dvt

[sshyann]

My husband had an angiogram days before Christmas they placed a stint in his left leg. for a few weeks, things seem to be fine, the color in his legs was looking better  .Then a few days ago his right leg starts hurting to the point he can't walk then the swelling starts up his leg and spreads to the other leg and the groin. He had ultrasounds done and it;s not DVT.  He was admitted to hospital where they gave him antibiotics to treat an infection and then discharged him a few days later. The swelling has not got any better  however the pain is not so intense, I really don't think it's an infection I feel that medical staff did not put much time or effort into my husband care as they should have So my question is does anyone know what else might cause the swelling