I had a heart cath procedure done on monday, 8-13-12..hospital discharged me that night, but no ideal how i'm i suppose to check for and change gauze?

Inspect site: Post cath site should have minimal bruising in most cases and no bleeding or drainage. While a small lump might be present for a few days (collection of dried blood/inflammation in the surrounding tissues), this should dissipate gradually. More extensive bruising or a pulsatile hematoma makes us think of a pseudoanneurysm, and a persistent thrill (purr) with palpation an a-v fistula.