What is the most common organism that causes infected abdominal aoic aneurysms (AAAs)?
Escherichia coli
Bacteroides
Salmonella
Pseudomonas aeruginosa
There are four different causes of an infected aneurysm. (1) Mycotic aneurysms involve a septic embolus from the hea infecting an aery. (2) Microbial aeritis involves bacteria infecting an athero- sclerotic aery to cause aneurysmal degeneration (80% of infected aneurysms). (4) Traumatic pseudoaneurysm that has concomitant bacterial inoculation. Salmonella causes 40% of all aneurysmal infections, with most others being caused by Streptococcus, Staphylococcus, Bacteroides, E. coli, and P. aeruginosa. Blood cultures are positive in only 50% of cases.
Aerial disorders