Peripheral Arterial Disease (PAD) results from systemic atherosclerosis causing progressive narrowing of peripheral arteries, most commonly in the lower limbs. Reduced blood supply leads to limb ischaemia.
PAD is a marker of systemic atherosclerosis. Patients have high concurrent risk of MI and stroke — cardiovascular risk management is mandatory alongside limb management.
Rutherford complements Fontaine with more granular clinical grading. Used widely in vascular surgery literature and trials.
| Category | Clinical Description | Fontaine Equivalent | Notes |
|---|---|---|---|
| 0 | Asymptomatic | Stage I | Normal treadmill test |
| 1 | Mild claudication | Stage IIa | Completes treadmill test; AP >50 mmHg after exercise |
| 2 | Moderate claudication | Stage IIa/IIb | Between categories 1 and 3 |
| 3 | Severe claudication | Stage IIb | Cannot complete treadmill; AP <50 mmHg after exercise |
| 4 | Ischaemic rest pain | Stage III | Resting ankle pressure <40 mmHg |
| 5 | Minor tissue loss | Stage IV | Non-healing ulcer, focal gangrene; ankle pressure <60 mmHg |
| 6 | Major tissue loss | Stage IV | Extending beyond transmetatarsal level — limb not salvageable |
Compression CONTRAINDICATED if ABI <0.8. Always perform ABI before applying compression bandaging. ABI 0.5–0.8: use modified reduced compression only with vascular specialist input.
CLI = Limb Salvage Emergency. Requires urgent vascular surgery review within hours.
SURGICAL EMERGENCY. Window for limb salvage is 4–6 hours from symptom onset before irreversible muscle death.
Paralysis + paraesthesia = neuromuscular involvement = irreversible damage imminent. Escalate immediately and activate vascular surgical team.
Highest brachial value will be used as the denominator for both ABI calculations.
Combines B-mode imaging with colour flow Doppler. Quantifies stenosis percentage and peak systolic velocity (PSV) ratio. PSV ratio >2.0 = >50% stenosis; >4.0 = >75% stenosis.
Used for: graft surveillance, access site assessment, DVT diagnosis, vein mapping before bypass surgery.
Excellent spatial resolution. Gold standard for pre-procedural planning and runoff assessment. Multi-planar reconstruction shows anatomy from aorta to foot.
Nursing consideration: Nephrotoxic contrast — check eGFR, hold metformin 48 h peri-procedure, ensure IV hydration. Post-scan: monitor for contrast reactions, urine output.
Uses gadolinium contrast (nephrosystem-safe alternative) or non-contrast techniques. Good for patients with contrast allergy or renal impairment. Slightly lower spatial resolution than CTA. Longer scan time; not suitable for claustrophobic patients or metallic implants.
Catheter-based imaging. Gold standard for arterial imaging and the only modality enabling simultaneous intervention (angioplasty, stenting, thrombolysis).
Access: femoral (commonest), radial, or brachial. Post-procedure nursing care essential — access site monitoring, limb perfusion checks.
Used when ABI is falsely elevated (>1.3) due to calcified, non-compressible vessels — common in diabetes and CKD. Digital arteries rarely calcify.
Normal TBI: ≥0.70. TBI <0.70 indicates PAD. TBI <0.15 = critical ischaemia.
Uses photoplethysmography (PPG) probe on toe and standard arm cuff.
Measures oxygen diffusion through skin surface — surrogate for tissue perfusion. Applied over wound area and dorsum of foot.
TcPO2 >40 mmHg: wound healing expected.
TcPO2 30–40 mmHg: healing uncertain.
TcPO2 <30 mmHg: healing unlikely without revascularisation.
Multiple cuffs applied at thigh, above knee, below knee, ankle. Pressure gradients >20–30 mmHg between adjacent segments indicate significant stenosis at that level.
PVR: waveform analysis of volume changes — normal triphasic waveform becomes biphasic then monophasic as PAD severity increases.
Retroperitoneal haematoma: Flank/back pain + hypotension after femoral access = retroperitoneal bleed. Urgent CT and surgical review.
Balloon catheter passed across stenosis under fluoroscopic guidance; inflated to dilate vessel. Can be performed as day case or overnight stay. Less invasive, faster recovery, suitable for high-risk surgical patients.
Metal stent deployed after PTA to maintain vessel patency. Balloon-expandable (precise placement) or self-expanding (flexible). Drug-eluting stents reduce re-stenosis rate in femoropopliteal segment.
Conduit (autologous vein — great saphenous preferred — or PTFE graft) tunnelled from femoral to popliteal artery. Above-knee or below-knee depending on disease distribution.
For aorto-iliac occlusive disease. Prosthetic graft from infrarenal aorta to both femoral arteries. Major surgery — high-risk patient population (concurrent cardiac / respiratory disease).
Graft thrombosis: Sudden loss of previously present Doppler signal + return of ischaemia symptoms = immediate surgical escalation. 4–6 hour window.
Lower threshold for women (≥5.0 cm) and rapidly expanding (>1 cm/year).
Stent-graft deployed via femoral access under X-ray guidance. Excludes aneurysm sac from aortic circulation. Lower perioperative mortality vs open surgery — suitable for high-risk patients.
Ruptured AAA = highest-risk surgical emergency. Mortality >50% even with emergency surgery.
CONTRAINDICATED in arterial disease. ALWAYS measure ABI before applying any compression. ABI <0.8 = do NOT compress.
Target: 40 mmHg at ankle, reducing to 17 mmHg at knee (graduated compression). Change weekly or as clinically indicated. Use reduced compression systems (e.g. 2-layer) if ABI 0.5–0.8 with vascular input.
Ischaemic tissue debridement: Conservative approach — avoid aggressive debridement in non-infected dry gangrene where blood supply is insufficient for healing.
Smoking is the single greatest modifiable risk factor for PAD. Cessation reduces progression of disease, improves claudication distance, and reduces cardiovascular mortality. Patients who continue smoking after bypass have significantly reduced graft patency.
GCC context: Shisha (water pipe) smoking is highly prevalent. Shisha significantly increases PAD risk — equivalent or greater vascular toxicity than cigarettes due to session duration and toxic gas volume. Patients often do not consider shisha as "smoking." Always ask specifically about shisha use.
Diabetes is the strongest risk factor for PAD in the GCC region. HbA1c target: <53 mmol/mol (7%) for most patients with PAD. Poorly controlled diabetes combined with PAD carries the highest amputation risk.
GCC context: Type 2 diabetes prevalence among the highest globally (UAE, Saudi Arabia, Kuwait). High sedentary lifestyle, high-calorie traditional diets, genetic predisposition contribute.
Metformin: hold 48 h before and after iodinated contrast procedures due to CIN + lactic acidosis risk.
BP target in PAD: <130/80 mmHg. ACE inhibitors / ARBs preferred (cardiovascular protective, reduce amputation risk). Avoid beta-blockers in severe claudication (may worsen symptoms) unless strong cardiac indication.
Statins: Mandatory for ALL PAD patients regardless of cholesterol level. Statins improve claudication, slow progression, and reduce cardiovascular events. High-intensity statin (atorvastatin 40–80 mg) recommended.
First-line therapy for intermittent claudication (Fontaine IIa/IIb). Improves claudication distance, quality of life, and cardiovascular fitness.
Mechanism: Promotes collateral vessel formation, improves endothelial function, skeletal muscle metabolism adaptation, and reduces inflammatory markers.
In PAD + diabetes: minor foot injuries can rapidly progress to limb-threatening ulceration. Prevention education is critical.
PAD prevalence is rising rapidly in GCC countries, driven by the high burden of type 2 diabetes, hypertension, dyslipidaemia, and tobacco use (cigarettes and shisha). UAE, Saudi Arabia, and Kuwait have some of the highest diabetes-related amputation rates in the world.
The combination of peripheral neuropathy and PAD creates the highest amputation risk. Sensory loss (no warning pain) + ischaemia (poor healing) = rapid progression from minor trauma to amputation. Multidisciplinary diabetic foot team is essential — vascular surgery, podiatry, endocrinology, orthopaedics, wound care nursing.
Sedentary lifestyle: traditional sitting posture, limited physical activity, air-conditioned environments. Dietary patterns: high refined carbohydrate, sugary beverages.
Language barriers: ensure patient education materials available in Arabic. Family-centred decision-making: involve family in education sessions where culturally appropriate.
| ABI Value | Interpretation | Fontaine Stage | Compression? | Action |
|---|---|---|---|---|
| > 1.3 | Calcified vessels (non-compressible) | N/A | Use TBI | Order TBI; likely PAD in diabetics |
| 0.91–1.30 | Normal | I | Safe | Risk factor management; reassess if symptoms |
| 0.70–0.90 | Mild PAD | IIa | Safe | Supervised exercise; antiplatelet; statin |
| 0.50–0.69 | Moderate PAD | IIb | Caution / Reduced | Vascular referral; imaging; consider endovascular |
| 0.40–0.49 | Moderate-Severe PAD | III | CONTRAINDICATED | Urgent vascular referral |
| < 0.40 | Critical Limb Ischaemia | III–IV | CONTRAINDICATED | Same-day vascular surgery — limb salvage emergency |
Exam tip: The cut-off for compression contraindication is ABI <0.8, NOT <0.4. ABI 0.8–1.0 with symptoms = mild PAD; compression with monitoring is acceptable. ABI <0.8 = do NOT compress.
Exam tip: Paralysis and paraesthesia are the most clinically significant Ps — indicate neurological involvement. Irreversible muscle damage begins at 4–6 hours.
Q: What is the ABI cut-off below which compression is contraindicated?
A: ABI <0.8 — do NOT apply compression bandaging without vascular specialist input.
Q: How is ABI calculated?
A: Highest ankle pressure (DP or PT) divided by highest brachial pressure. One ABI per limb.
Q: ABI is 1.4 in a diabetic patient. What do you do?
A: ABI >1.3 = calcified vessels (non-compressible). Order Toe-Brachial Index (TBI) instead.
Q: What is the most impactful intervention in PAD management?
A: Smoking cessation — slows disease progression, improves symptoms, reduces cardiovascular mortality.
Q: Patient presents with sudden cold, pale, pulseless leg. What condition is this?
A: Acute limb ischaemia. Surgical emergency. Activate vascular surgery immediately — 4–6 hour window.
Q: What position should you place the leg in critical limb ischaemia?
A: Flat or dependent (hanging down) — do NOT elevate. Elevation reduces perfusion pressure, worsening ischaemia.
Q: Which ulcer type is painful with minimal exudate at the toes?
A: Arterial ulcer. Venous ulcers are high exudate, medial gaiter area. Neuropathic ulcers are painless plantar.
Q: Are statins indicated in PAD if cholesterol is normal?
A: YES — statins are mandatory for ALL PAD patients regardless of cholesterol level (pleiotropic vascular protective effects).
Q: What surveillance is required after EVAR?
A: Annual CT imaging for endoleak detection (types I–IV). Endoleak = blood flow outside stent-graft but within the aneurysm sac.
| Drug Class | Example | Indication in PAD | Key Nursing Point |
|---|---|---|---|
| Antiplatelet | Clopidogrel 75 mg od / Aspirin 75 mg od | All symptomatic PAD, post-intervention | Do NOT omit peri-procedurally without vascular team instruction; monitor for bleeding |
| Statin (high-intensity) | Atorvastatin 40–80 mg nocte | ALL PAD patients — mandatory | Myopathy monitoring; liver function baseline; check for drug interactions |
| ACE Inhibitor / ARB | Ramipril, Perindopril | Hypertension in PAD; cardiovascular protection | Monitor renal function and potassium; hold before contrast procedures in AKI risk |
| Anticoagulant | Heparin IV / LMWH | Acute limb ischaemia; post-bypass; DVT | Monitor activated clotting time (intra-procedure); APTT for heparin infusion; bleeding precautions |
| Thrombolytic | Alteplase (rt-PA), Urokinase | Catheter-directed thrombolysis in acute ischaemia | Strict monitoring for bleeding — neurological, GI, access site; contraindications: recent surgery/stroke |
| Cilostazol | Cilostazol 100 mg bd | Intermittent claudication (second-line) | Contraindicated in heart failure; improves walking distance; headache common side effect |
| Prostanoid | Iloprost IV infusion | Critical limb ischaemia not amenable to revascularisation | Specialist use; hypotension, flushing — careful rate titration; inpatient administration |