Aneurysms Flashcards
Aneurysm definition
A permanent localized arterial dilatation more than 1.5 x the expected normal diameter of that vessel
Ectasia definition
Localised arterial dilatation 1-1.5 x normal diameter
Arteriomegaly definition
Multi-segmental arterial dilatation 1-1.5x normal diameter of a single vessel
Different ways to classify aneurysms
- location
- size
- type
- shape
- aetiology
Aneurysm classification by etiology
- congenital
- CTD
- degenerative
- infectious
- inflammatory
- post-dissection
- post-stenotic
- pseudoaneurysm
- miscellaneous
Types of abdominal aortic aneurysms
- infra-renal
- juxta-renal
- para-renal
- supra-renal
- thoraco-abdominal
Risk factors for operative mortality for AAA
- age >70 years
- females
- renal dysfunction
- severe pulmonary dysfunction
- cardiac co-morbidity
Why do we screen for AAA?
- 70% are asymptomatic
- 75% die before reaching hospital
- <5% mortality with elective repairs
- US is effective and inexpensive
For whom is selective screening for AAA recommended?
- caucasian males >65
- patients with peripheral aneurysms
- family history of AAA
- thoracic aneurysms
Medical management of AAA
- smoking cessation
- weight loss
- lipid lowering agents
- anti-platelet agents
- B-blockers
- optimize co-morbidities
Indications for AAA surgical management
- all symptomatic AAA
- asymptomatic AAA >5.5cm
- asymptomatic small AAA with expansion >1cm per annum
- assocaited iliac aneurysm >3cm
Options for surgical management of AAA
- open repair
- EVAR
- robotic/ laparoscopic assisted
Early complications of AAA surgery
- CVS: MI, CCF, hypotension
- iatrogenic: ureteric or splenic injury
- renal failure
- paralytic ileus, ischaemic colitis
- lower extremity ischaemia
- paraplegia
- sexual dysfunction
- DVT
Late complications of AAA surgery
- pseudoaneurysm
- graft sepsis
- aorto-enteric fistula
- graft occlusion
Triad for ruptured abdominal aortic aneurysm
- shock
- backache
- pulsatile abdominal mass