18.2 Access-Site Complications
Key Takeaways
- Groin hematoma presents as visible swelling at the puncture site; expanding hematoma with hypotension may signal occult retroperitoneal hemorrhage requiring urgent imaging and surgical consultation.
- Pseudoaneurysm is a pulsatile sac of blood contained by adventitia outside the arterial wall, diagnosed by duplex ultrasound and often treated with ultrasound-guided compression or thrombin injection.
- Arteriovenous fistula at the femoral access site creates a continuous bruit and thrill from an artery–vein connection, usually from low bifurcation puncture, and may require surgical repair if large.
- Radial artery occlusion is often silent but eliminates future radial access in that vessel; risk is minimized by patent hemostasis, adequate anticoagulation, and smaller sheath sizes.
- The RCIS role is early recognition — monitoring vital signs, inspecting access sites, palpating for bruits, checking distal perfusion — and immediate escalation rather than independent definitive treatment.
Why Access-Site Complications Matter
Access-site complications are Domain E Task 2 on the RCIS outline and among the most tested post-procedural topics. While major vascular complications occur in 1–3% of diagnostic procedures and 2–6% of interventional cases (higher with femoral access, anticoagulation, and large-bore sheaths), they account for a disproportionate share of cath lab morbidity, transfusions, prolonged hospitalization, and mortality. The RCIS is the first line of detection during hemostasis and recovery — recognizing subtle signs before hemodynamic collapse is the difference between bedside compression and emergency surgery.
Bleeding
External bleeding is the most immediately visible complication. Presentation ranges from slow oozing under a dressing to ** pulsatile spurting** indicating inadequate hemostasis or suture/closures device failure.
Risk Factors
- Supratherapeutic anticoagulation (elevated ACT, concurrent GPI, therapeutic enoxaparin)
- Premature sheath removal before adequate coagulation
- Inadequate compression (wrong site, insufficient duration, patient movement)
- Large sheath size (8 Fr and above)
- Hypertension during recovery (SBP >140–160 increases bleed risk)
- Closure device malfunction or early ambulation against protocol
RCIS Response
- Apply direct pressure immediately at the arterial puncture site (1–2 cm cephalad to skin entry for femoral).
- Notify the operator and charge nurse — do not wait for visible hemodynamic change.
- Check vital signs: tachycardia and hypotension may lag behind visible bleeding.
- Inspect ACT/coagulation status and prepare for possible protamine, blood products, or re-intervention.
- Document time of discovery, interventions, and response.
For radial rebleed, reinflate the patent hemostasis device or reapply point pressure. For femoral rebleed, manual compression or mechanical assist (FemoStop) at arterial level — not over a hematoma (which transmits pressure poorly to the arteriotomy).
Hematoma
A hematoma is a localized collection of blood within tissue planes at or near the access site. Small hematomas are common and self-limited; expanding hematomas demand urgent evaluation.
Presentation
- Visible or palpable groin/wrist swelling — may be tense and painful
- Discoloration extending beyond the puncture site
- New bruit or thrill (suggests pseudoaneurysm or AV fistula, not simple hematoma)
- Femoral neuropathy symptoms — numbness or weakness in the leg (lateral femoral cutaneous or femoral nerve compression from large hematoma)
Expanding Hematoma Algorithm
| Finding | Urgency | Next Step |
|---|---|---|
| Stable vitals, small stable swelling | Monitor | Pressure dressing, serial exams, hemoglobin |
| Expanding swelling, stable vitals | Urgent | Hold pressure, stat hemoglobin, vascular ultrasound |
| Expanding swelling + hypotension | Emergency | Activate hemorrhage protocol, type/cross, CT/surgery consult |
| Back/flank pain + groin procedure | Emergency | Suspect retroperitoneal bleed — see below |
Compartment syndrome of the thigh or forearm is rare but catastrophic — watch for severe pain out of proportion, tense swelling, pain with passive stretch, and loss of distal pulses. This requires emergency fasciotomy consultation.
Pseudoaneurysm
A pseudoaneurysm (false aneurysm) forms when blood extravasates through the arterial puncture site but is contained by surrounding tissue (adventitia and soft tissue), creating a pulsatile cavity that communicates with the artery through a neck.
Presentation
- Pulsatile mass at the groin (or wrist for radial) — often 1–5 cm
- Bruit on auscultation; thrill on palpation
- May appear days to weeks after the procedure (not only immediately)
- Associated with low femoral puncture at the bifurcation, inadequate compression, and anticoagulation
Diagnosis and Treatment
Duplex ultrasound is the diagnostic standard — shows to-and-fro flow in the sac through a neck connecting to the artery.
| Treatment | Indication | RCIS Role |
|---|---|---|
| Ultrasound-guided compression | Small pseudoaneurysm, suitable anatomy | Assist positioning, monitor patient comfort |
| Ultrasound-guided thrombin injection | Failed compression, suitable neck | Prep tray, monitor vitals |
| Surgical repair | Large, ruptured, infected, failed percutaneous | OR prep, hemodynamic monitoring |
| Observation | Very small (<2 cm), asymptomatic, not anticoagulated | Serial ultrasound per vascular surgery |
Pseudoaneurysm rupture causes hemorrhagic shock — treat as vascular emergency.
Arteriovenous Fistula (AV Fistula)
An AV fistula at the access site results from simultaneous arterial and venous puncture or low bifurcation femoral puncture connecting the superficial femoral or profunda artery to the adjacent femoral vein.
Presentation
- Continuous machinery murmur (bruit) — unlike the systolic bruit of pseudoaneurysm
- Palpable thrill over the groin
- Usually asymptomatic hemodynamically if small
- Large fistulas may cause high-output heart failure (rare, chronic)
Diagnosis and Management
Duplex ultrasound shows arterial flow into the venous system with dilated draining vein. Small fistulas may close spontaneously (30–60% within 1 year). Persistent symptomatic or large fistulas require ultrasound-guided compression, covered stent placement, or surgical ligation. The RCIS documents new bruits during recovery checks and notifies the team for ultrasound evaluation.
| Feature | Pseudoaneurysm | AV Fistula |
|---|---|---|
| Murmur | Systolic or to-and-fro bruit | Continuous machinery murmur |
| Mass | Pulsatile, may be tender | Thrill without discrete mass |
| Ultrasound | Pulsatile sac with neck | Arterial-venous connection |
| Common cause | Inadequate compression | Low bifurcation puncture |
Arterial Occlusion
Radial artery occlusion (RAO) is the most common asymptomatic access-site "complication" — incidence 5–10% with traditional compression, reduced to 1–5% with patent hemostasis. The patient typically has no hand ischemia because ulnar collateral flow via the palmar arch is adequate.
Detection and Significance
- Absent radial pulse or loss of radial pulse oximetry signal after band removal
- Barbeau testing may show dependence on ulnar flow
- Eliminates future ipsilateral radial access — significant for repeat catheterization programs
Prevention: patent hemostasis, 6 Fr or smaller sheaths, adequate procedural anticoagulation, single-wall puncture, and early ambulation of fingers during recovery.
Femoral or brachial artery thrombosis is less common but more dangerous — presents with acute limb ischemia: pain, pallor, pulselessness, paresthesia, paralysis ("6 Ps"). This is a vascular emergency requiring immediate operator and vascular surgery notification, anticoagulation per order, and possible thrombectomy or bypass.
Retroperitoneal Hemorrhage
Retroperitoneal bleed is the most lethal access-site complication and the one most likely to be missed early. It occurs when the common femoral artery is punctured above the inguinal ligament (high puncture) or when bleeding tracks posteriorly from the arteriotomy into the retroperitoneal space.
Why It Is Dangerous
The retroperitoneum can accommodate liters of blood without visible groin swelling. External groin exam may show only a small hematoma or appear normal while the patient loses massive blood volume into the retroperitoneal space.
Classic Presentation
- Back, flank, or lower abdominal pain — often disproportionate to groin findings
- Hypotension and tachycardia — may be sudden
- Dropping hemoglobin/hematocrit — serial labs essential
- Femoral neuropathy (pain with hip extension)
- Groin may appear benign or show only modest swelling
RCIS Response — Treat as Emergency
- Activate the hemorrhage/shock protocol — notify operator, attending, nursing leadership.
- Large-bore IV access, type and crossmatch, stat hemoglobin.
- Bedside ultrasound or CT angiography per institutional protocol.
- Reverse anticoagulation per physician order.
- Prepare for interventional or surgical repair — covered stent, surgical exploration.
- Do not reassure based on a normal-appearing groin.
| Access Complication | Key Distinguishing Feature | First RCIS Action |
|---|---|---|
| External bleed | Visible blood at site | Direct pressure, notify team |
| Hematoma | Swelling at site | Monitor vs. urgent eval if expanding |
| Pseudoaneurysm | Pulsatile mass + bruit | Notify, prepare for ultrasound |
| AV fistula | Continuous bruit + thrill | Notify, prepare for ultrasound |
| RAO | Absent radial pulse, warm hand | Document, notify for future access planning |
| Retroperitoneal bleed | Back/flank pain + hypotension, benign groin | Emergency activation, stat labs |
Post-Recovery Monitoring Protocol
The RCIS and recovery staff perform structured access-site checks:
- Every 15 minutes × 4, then every 30 minutes × 4, then every hour (institution-specific)
- Inspect dressing integrity, swelling, color, temperature
- Palpate for mass, bruit, thrill (gentle, do not disrupt hemostasis)
- Check distal perfusion — thumb/wrist (radial), foot pulses (femoral)
- Trend vital signs and report pain that is new or disproportionate
Exam Focus Points
RCIS items frequently test retroperitoneal bleed with benign groin exam and back pain, pseudoaneurysm vs AV fistula differentiation by bruit character, patent hemostasis preventing RAO, and expanding hematoma with falling hemoglobin requiring escalation. The most dangerous wrong answer pattern is dismissing hypotension after femoral access because the groin looks fine — always consider occult retroperitoneal hemorrhage.
Four hours after a transfemoral PCI, a patient reports new lower back and flank pain. Vital signs show BP 82/50 mmHg and HR 118 bpm. The groin dressing shows minimal staining and no significant swelling. What is the most likely complication?
A patient returns for evaluation one week after femoral catheterization. Examination reveals a pulsatile groin mass with a systolic bruit on auscultation. Duplex ultrasound confirms a connected sac with to-and-fro flow. What is the most likely diagnosis?
During a recovery room check, a femoral access patient has a new continuous machinery murmur and palpable thrill at the groin without a discrete pulsatile mass. Vital signs are stable. What complication should the team evaluate for first?