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SURGERY
Vascular
Question | Answer |
---|---|
Cause of AAA | due to vessel wall weakness secondary to loss of collagen/elastin, may be from atherosclerosis |
Most common location for AAA | typically infrarenal |
How are most AAA diagnosed? | most asymptomatic & discovered on routine PE |
Sx's of AAA | Sx may include vague epigastric discomfort or back/abd pain |
How would symptomatic AAA pt present? | pt may present w. rupture (abd pain, pulsatile abd mass, hypotension) |
What is a good way to clinically follow a AAA? | U/S (easiest, least $), CT (accurate, expensive) |
In a AAA, what do you use an A-gram for? | looking for signs of lumen patency & iliac/renal involvement, |
If pt has sx's of a AAA rupture, what imaging study do you do before going to the OR? | None. Go directly to OR. |
What kind of imaging do you do to see calcification in the wall of an aneurysm? | KUB |
AAA associated with which other types of aneurysms? | thoracic aorta (4%), femoral (3%), popliteal (2%) |
AAA also associated with which conditions? | CAD, HTN, occlusive arterial dz |
Indications for surgical AAA repair | rupture, size (> 4-5cm), size increase (> 0.5cm/6mos), Sx from aneurysm |
What is the surgical tx for AAA? | IMA ligation, removal of thrombus through anterior wall, tube or bifurcation graft placed, wrap graft in native Ao |
Risks of surgery for AAA | MI & arrhythmias, atheroembolism, declamping, hypotension, acute renal failure, ureteral injury, hemorrhage, aortoenteric fistula, infxn, chylous ascites, colonic ischemia, stroke |
Risks of not tx AAA | 5 year survival rate of about 50% if < 6cm, 6% if > 6cm; rupture (75% mortality) |
Benefits of AAA surgery | Surgical repair doubles survival time for pts; elective operative mortality is 1-2%; emergent operative mortality is about 50% (w. 50% dying before getting to the hospital) |