Vascular Disease Basics
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Direct answer
Arteries narrow, arteries dilate, arteries block — that is half of vascular surgery in six words. Narrowing by atherosclerosis presents as intermittent claudication (cramping calf or thigh pain on walking, relieved within minutes by standing still), graded by the Fontaine stages from asymptomatic through claudication to rest pain and gangrene, with the ankle-brachial index (below 0.9 abnormal) quantifying it. Dilatation produces the aneurysm — abdominal aortic aneurysms are repaired electively above about 5.5 cm before they rupture. Occlusive disease in young Indian male smokers has a name every student must know: Buerger's disease (thromboangiitis obliterans), affecting upper and lower limbs with migratory superficial thrombophlebitis, for which the only real treatment is stopping tobacco. On the venous side sit varicose veins with their Trendelenburg testing, deep vein thrombosis with Virchow's triad, and the three great leg ulcers — venous, arterial and neuropathic — separated by site, pain and pulses.
What you must remember
- Fontaine stages of chronic limb ischaemia: I asymptomatic; IIa claudication beyond 200 m, IIb under 200 m; III rest pain; IV ulceration or gangrene — critical limb ischaemia is stages III-IV, with rest pain and ankle pressure typically below about 50 mmHg.
- Ankle-brachial index: ratio of ankle to brachial systolic pressure — below 0.9 suggests arterial disease, around 0.4 or less critical ischaemia; absent pulses, hair loss, thickened nails and elevation pallor complete the arterial examination.
- Buerger's disease (thromboangiitis obliterans): young male smokers, distal arteries and veins of both upper and lower limbs, migratory superficial thrombophlebitis, positive vein sign and address? no — presentation with claudication of small-vessel type, Raynaud features, and the imperative of complete tobacco cessation; common in Indian vascular clinics.
- Aneurysm essentials: true (all three wall layers) versus false (contained rupture, one-layer sac); abdominal aortic aneurysm repair threshold commonly 5.5 cm or symptomatic; the mortal risk is rupture with pain, hypotension and a pulsatile abdominal mass.
- Carotid disease: bruit with transient ischaemic attacks — amaurosis fugax, hemiparesis, dysphasia; carotid endarterectomy for symptomatic stenosis above about 70 per cent.
- Varicose veins and DVT: varicose veins — dilated tortuous superficial veins, tested by Trendelenburg and tourniquet tests, complicated by eczema, lipodermatosclerosis and ulceration; deep vein thrombosis — Virchow's triad, calf tenderness and swelling, diagnosed by doppler ultrasound, treated with anticoagulation to prevent pulmonary embolism.
- The three leg ulcers by bedside logic: venous — gaiter area, shallow, sloping edge, oedematous skin, moderately painful, pulses present; arterial — distal toes and pressure points, punched out, deeply painful at night relieved by dangling, pulses absent; neuropathic (diabetic) — plantar pressure points, painless, punched out, glove-stocking anaesthesia, often complicated by infection — the diabetic foot is a daily Indian surgical problem combining all three mechanisms.
One disease, three prescriptions
Follow atherosclerosis through three lives. A 60-year-old with diabetes and smoking walks 150 metres before his calf cramps: claudication — the prescription is stop smoking, walk daily to collateralise, control sugar and lipids, antiplatelet therapy; surgery waits. The same man, two years later, sleeps with his foot dangling because rest pain wakes him: critical limb ischaemia — angiography and revascularisation (bypass or angioplasty) now decide whether he keeps the limb; the diabetic foot ulcer on his heel adds debridement, offloading and infection control. A third patient, 70, never smoked, presents with collapse and a tender pulsatile abdominal mass: ruptured abdominal aortic aneurysm — the emergency where theatre must follow the diagnosis within minutes. One pathology, three clinical universes, and each is a standard BDS viva vignette: the examinable skill is reading the stage — claudication is a walk in the outpatient clinic, rest pain is a race to the vascular laboratory, rupture is a sprint to theatre.
Where students slip
The commonest confusion is the ulcer with the wrong label: a painful punched-out ulcer with absent pulses treated as "varicose" — check the pulses before the stockings, because compression on an ischaemic limb destroys it. The second is claudication distance as trivia: examiners want Fontaine stage language and its management boundaries (conservative for claudication, urgent imaging for rest pain). And the diabetic foot is not one ulcer but three pathologies braided — ischaemia, neuropathy and infection — an answer structure that earns marks because it dictates treatment order: revascularise, debride, offload, culture.
Frequently asked questions
What is intermittent claudication and what relieves it?
Cramping muscle pain — typically calf — brought on by a fixed walking distance and relieved within a few minutes of standing still, caused by inadequate arterial supply to exercising muscle.
How do venous and arterial leg ulcers differ at the bedside?
Venous ulcers sit in the gaiter area with sloping edges, oedema and pigmentation and pulses present; arterial ulcers are distal and punched-out, exquisitely painful with absent pulses.
Why is Buerger's disease linked so strongly to smoking?
Continued tobacco exposure drives the inflammatory thrombosis of distal arteries and veins; cessation is the only intervention that reliably halts progression, and even a few cigarettes relight the disease.
What is Virchow's triad?
Stasis of flow, endothelial injury and hypercoagulability — the three mechanisms underlying venous thrombosis, each mapped to a prophylactic measure: mobilisation, care of veins, and anticoagulation when risk-stratified.
At what size is an abdominal aortic aneurysm repaired electively?
Commonly at 5.5 cm or more in fit patients, or earlier if symptomatic, enlarging rapidly, or saccular — because rupture risk climbs steeply with diameter.