<prompt> Answer this question truthfullyWhat are the management options for patients with unstable and stable vital signs and abdominal aortic aneurysm AAA, with and without a known history of AAA?  <response>: <reason> Patients with unstable vital signs and AAA and no history are managed with ultrasound US. Patients with unstable vital signs and AAA and a known history are managed with surgery. Patients with stable vital signs and AAA are managed with CT. 