How should a patient be prepared, including antiplatelet therapy, laboratory evaluation, hydration, imaging, and access technique, before undergoing lower‑limb angioplasty?

Blood Vessel Preparation Prior to Lower Limb Angioplasty

For patients undergoing lower limb angioplasty, initiate single antiplatelet therapy with aspirin 75-325 mg daily (or clopidogrel 75 mg daily if aspirin intolerant), ensure adequate hydration for contrast nephropathy prevention in those with renal impairment, obtain baseline laboratory values including complete blood count and coagulation studies, and plan arterial access technique with consideration for same-day discharge protocols. 1, 2

Antiplatelet Therapy

Pre-procedural antiplatelet management:

• Aspirin monotherapy is the foundation: patients already on aspirin should continue 75-325 mg daily; those not on aspirin should receive it before the procedure 1
• Clopidogrel 75 mg daily is an acceptable alternative for aspirin-intolerant patients (hypersensitivity or major gastrointestinal intolerance) 1
• Loading doses are NOT routinely required for elective lower limb angioplasty, unlike coronary interventions 1

Post-procedural considerations:

• After successful angioplasty, continue single antiplatelet therapy indefinitely for cardiovascular risk reduction 1
• Dual antiplatelet therapy (aspirin + clopidogrel) may be considered after complex revascularization or stent placement, though evidence is primarily extrapolated from coronary studies 1, 3
• The addition of low-dose rivaroxaban 2.5 mg twice daily to aspirin reduces major adverse limb events after recent revascularization but increases bleeding risk—reserve for high-risk patients 1

Laboratory Evaluation

Essential pre-procedural testing:

• Complete blood count: verify platelet count >50,000/μL; if lower, transfuse to achieve >50,000/μL before proceeding 4
• Coagulation studies: obtain INR and ensure <1.5; if elevated, correct before the procedure 4
• Renal function assessment: measure creatinine and calculate GFR to stratify contrast-induced nephropathy risk 5

Anticoagulation management:

• Warfarin: INR should be <1.5 for safe arterial access 4
• Clopidogrel: withhold for 5 days if procedure must be delayed and bleeding risk is prohibitive, though this is rarely necessary for standard angioplasty 4, 6
• Aspirin: do NOT withhold—continue through the procedure 4, 6
• Therapeutic low molecular weight heparin: withhold one dose before the procedure 4

Hydration and Contrast Nephropathy Prevention

For patients with renal impairment (GFR <60 mL/min):

• Administer intravenous hydration with isotonic saline or sodium bicarbonate solution starting several hours before contrast exposure 5
• Consider N-acetylcysteine 600-1200 mg orally twice daily on the day before and day of procedure, though evidence for benefit is mixed 5
• Use minimum contrast volume necessary to complete the procedure 5
• Avoid nephrotoxic medications (NSAIDs, aminoglycosides) in the periprocedural period 5

Dietary preparation:

• Keep patients nil per os (NPO) after midnight for morning procedures 4
• Clear liquids may be permitted up to 2 hours before to prevent volume depletion 4

Intraprocedural Anticoagulation

Unfractionated heparin remains standard:

• Administer 70-100 IU/kg intravenous bolus at the start of the procedure 7
• Monitor with activated clotting time (ACT), targeting 200-300 seconds during the intervention 5, 7
• Heparin is typically NOT reversed at procedure completion 5
• Alternative: enoxaparin 0.5-0.75 mg/kg IV bolus may reduce bleeding compared to UFH 7

Imaging and Access Planning

Pre-procedural imaging:

• Review prior non-invasive imaging (duplex ultrasound, CT angiography, or MR angiography) to plan access site and target lesions 1
• Identify suitable access vessels and anticipate anatomical challenges 2

Access technique considerations:

• Antegrade femoral access is commonly used for ipsilateral lower limb interventions 8
• Sheath sizes 4-7 French are standard for most lower limb angioplasty procedures 2
• Closure devices are NOT routinely necessary: manual compression with 3-hour recovery achieves 98% same-day discharge success 2
• Closure devices may be considered for larger sheaths, anticoagulated patients, or when immediate hemostasis is critical, though they add cost without proven superiority 8, 2

Common Pitfalls to Avoid

• Do NOT discontinue aspirin perioperatively—the thrombotic risk far outweighs bleeding risk in vascular patients 4, 6, 1
• Avoid "stacking" anticoagulants: if patient received subcutaneous enoxaparin within 12 hours, do not add UFH during the procedure 9
• Do NOT use fondaparinux as sole anticoagulant during angioplasty—add UFH or another agent with anti-IIa activity 9
• Recognize contrast-induced nephropathy risk: patients with baseline renal impairment, diabetes, and dehydration are most vulnerable 5
• Plan for same-day discharge: with appropriate patient selection and 3-hour post-hemostasis observation, 98% of patients can be safely discharged the same day, including those with critical limb ischemia 2