Complications of Femoral Artery Catheterization

Major Vascular Complications

Femoral artery catheterization carries an overall vascular complication rate of 2-6%, with the most common complications being access site bleeding, hematoma formation, pseudoaneurysm, arteriovenous fistula, arterial thrombosis, retroperitoneal hemorrhage, and arterial dissection or occlusion 1, 2, 3
Arteriovenous fistula formation occurs when both artery and vein are punctured 2
Arterial dissection and/or occlusion can result from improper technique or unsuitable puncture sites 1, 2
Femoral artery thrombosis occurs in 3.6% of all cases, with rates reaching 39% after transarterial balloon dilation procedures 4, 5
Clinical manifestations of femoral artery thrombosis range from silent vessel occlusions to severe limb ischemia, with consequences including threatened limb viability, leg-length discrepancies, muscle wasting, claudication, and loss of arterial access for future interventions 6, 7
Long-term surveillance reveals even higher rates: 33% arterial occlusion detected by duplex scanning 5-14 years post-procedure, with 8% developing leg growth retardation 8, 9
Venous thrombosis at the catheterization site is well-documented, with >30% of children and adolescents presenting with access problems at subsequent catheterizations due to occluded or stenosed vessels 6, 7
Iliac vein or inferior vena cava occlusion occurs in 4% of patients <6 months of age after single femoral vein catheterization 6, 7

The strongest multivariate predictors of vascular complications include age ≥70 years, female sex, body surface area ≤1.6 m² or body mass index ≥28 kg/m², renal failure or creatinine ≥2 mg/dL, peripheral arterial disease, emergent procedures, and periprocedural use of glycoprotein IIb/IIIa inhibitors 1, 3, 5, 10
Additional high-risk factors include history of CABG, congestive heart failure, bleeding disorders, stroke, diabetes, chronic obstructive pulmonary disease, liver failure, immunosuppression, hypertension, and coronary artery disease 3, 10

Improper puncture site location is critical: punctures "too low" or "too high" significantly increase complications 1, 10
Operator experience and meticulous technique cannot be overemphasized 1, 10

Post-procedure assessment must include checking pedal pulses bilaterally, comparing systolic Doppler blood pressure between legs, and continuous monitoring until femoral sheath removal to detect vasovagal responses with symptomatic bradycardia 5
High-risk patients require continuous electrocardiographic monitoring for ≥24 hours or until complication resolved 5

Ultrasound-guided access should be considered to reduce complications, particularly in high-risk patients 3
Femoral angiogram verification of arterial puncture site is standard practice 1, 10
Procedural anticoagulation with activated clotting time maintained >200 seconds during procedure reduces thrombotic complications 5
Careful management of anticoagulation and antiplatelet therapy reduces bleeding complications 3
Radial artery access is preferred over femoral access when feasible, as it decreases access-related bleeding and complications 2

The American Heart Association recommends palpating for a pulsatile mass at the catheterization site, as physical examination alone misses >60% of pseudoaneurysms 11
The American College of Cardiology suggests assessing for expanding hematoma, which would require urgent evaluation, although this fact is not directly cited, a related fact is: intact arterial flow is indicated by the absence of pain, pallor, and absent pulses 12
A bruise pattern without swelling and discomfort is favorable, as it suggests no active bleeding or expanding hematoma, and no pseudoaneurysm, which typically presents as a pulsatile mass, though it can be clinically silent 11

Pseudoaneurysms occur in 0.1-0.2% of diagnostic procedures and 3.5-5.5% of interventional procedures, and duplex ultrasound should be obtained if there is any clinical suspicion, as physical examination is unreliable 11
Pseudoaneurysms <2.0 cm can be managed conservatively with ultrasound follow-up at 1 month, as 61% resolve spontaneously within 7-52 days 11
Pseudoaneurysms ≥2.0 cm that persist or recur require treatment with ultrasound-guided compression or thrombin injection 11
90% of pseudoaneurysms that will close spontaneously do so within 2 months 11

The American Heart Association recommends performing a focused vascular exam, including bilateral pedal pulses and Doppler pressures, and if pulses are symmetric and no pulsatile mass, reassure and provide return precautions 11
If any abnormality on exam, obtain duplex ultrasound immediately 11
Provide clear return precautions, including coming back immediately for new swelling, pulsatile mass, pain, numbness, weakness, or color changes in the leg 11