General Surgery (Vascular Surgery) Flashcards
Define Abdominal Aortic Aneurysm
Abnormal dilation of Abdominal Aorta by more than 50% (ie dilation greater than 3cm)
Give 4 causes of AAA
Atherosclerosis
Trauma
Infection
CT Disease
Describe four clinical features of AAA
Abdominal Pain
Back/Loin Pain
Distal Embolisation (blue toe)
Pulsatile Abdominal Mass
How would you investigate AAA
Ultrasound
CT with Contrast
What is the AAA screening tool
Abdominal USS for all men in their 65th year
If 3-4.4cm then yearly USS
If 4.5-5.4 then 3 monthly USS
Describe the medical management of AAA
Monitoring with Ultrasounds
Reduce Risk Factors
Atorvastatin and 75mg Clopidogrel
When is surgery for AAA considered?
AAA>5.5cm
Expanding more at a rate of more than 1cm a year
Symptomatic AAA (if otherwise fit)
Describe the two surgical options for AAA
Open Repair - Midline laparotomy, clamping proximally and iliac arteries distally, segment removed and replaced with graft
Endovascular Repair - Introducing graft via femoral arteries
Give three complications of AAA
Embolisation
Aortoduodenal Fistula
Rupture
What is the AAA rupture triad?
Pulsatile Abdo Mass
Hypotension
Back/Flank Pain
How would you manage an AAA rupture
IV Fluids and circulatory support (try to keep systolic under 100mmHg to prevent dislodging clots)
If unstable - Immediate open surgical repair
If stable - CT Angiogram Pre-Op
What is an Aortic Dissection?
Tear in the intimal layer of aortic wall, causing blood to flow between Tunica Intima and Tunica Media
Describe the two different types of Aortic Dissection progression
Anterograde - Towards Iliac Arteries
Retrograde - Towards Aortic Valve
Describe the Stanford Classification of Aortic Dissection
Group A - Ascending Aorta
Group B - Descending Aorta
Describe the DeBakey Classification of Aortic Dissection
I - Ascending Aorta to arch (atleast)
II - Confined to Ascending Aorta
III - Originates distal to subclavian in descending
IIIa - Extends distally to diaphragm
IIIb - Extends beyond diaphragm (encompassing AA)
What are the clinical features of an Aortic Dissection?
Tearing chest pain radiating to the back
Tachycardia
Hypotension
Aortic Regurg
How would you image Aortic Dissections?
CT Angiogram
TOE
How would you manage Aortic Dissections?
Both types require O2 and IV Fluids (only enough to maintain cerebral perfusion)
Type A - Immediate transfer to cardiothoracic centre and graft
Type B - Medical management with IV Beta Blovkers, surgery if ischaemia/rupture or uncontrolled
Thoracic Aneurysms are less common than Abdominal Aneurysms but have a high mortality. How do they present?
Often incidental finding
Ascending Aorta - Anterior Chest Pain
Aortic Arch - Neck Pain
Descending Aorta - Pain between scapulae
May get secondary compression symptoms
How would you image a suspected Thoracic Aneurysm?
CT chest with contrast
TOE
What is Acute Limb Ischaemia?
Sudden decrease in limb perfusion that threatens limb viability (doesn’t have to be a complete occlusion)
Give 3 underlying causes of Acute Limb Ischaemia
Embolisation
Thrombosis In-situ
Trauma
Using the 6P’s, describe the clinical features of Acute Limb Ischaemia
Pain
Pallor
Pulselessness
Paraesthesia
Paralysis
Perishingly Cold
How are Acute Limb Ischaemias classified?
Using the Rutherford Classification
Parameters include Prognosis, Sensory Loss, Motor Deficit, Arterial Doppler, Venous Doppler
Give four investigations for Acute Limb Ischaemia
Routine bloods (inc serum lactate and thrombophilia screen)
ECG
Doppler USS
CT Angiography
What is the initial management of Acute Limb Ischaemia?
High Flow O2
IV Access
Heparin bolus then heparin infusion
What is the conservative management of Acute Limb Ischaemia?
Prolonged course of Heparin and monitoring of APTT
Describe the surgical management of Acute Limb Ischaemia
Embolic Cause - Embolectomy, Bypass
Thrombotic Cause - Angioplasty, Bypass
Amputation
What is Chronic Limb Ischaemia?
Peripheral arterial disease resulting in symptomatic reduced blood supply
Typically caused by atherosclerosis and affects lower limbs
What are the four clinical stages of Chronic Limb Ischaemia?
I - Asymptomatic
II - Intermittent Claudication
III - Ischaemic Rest Pain
IV - Ulceration/Gangrene
Describe the Buerger’s Test
Lay the patient supine, and raise the affected leg until pale, and hen lower to normal
Buerger’s Angle of less than 20 degrees indicates severe limb ischaemia
What is Leriche Syndrome?
A form of Peripheral Arterial Disease specifically affecting the aortic bifurcation
Presents with buttock/thigh pain and associated erectile dysfunction
What is Critical Limb Ischaemia?
Advanced form of Chronic Limb Ischaemia
How does Critical Limb Ischaemia present?
Ischaemic Rest Pain for longer than two weeks
Presence of Ischaemic Lesions/Gangrene
ABPI<0.5
Limb Hair Loss
Thickened Nails