Iatrogenic and Pediatric Vascular Trauma

67.1Definition and presentation

Iatrogenic vascular trauma primarily arises during procedural interventions, including cardiac catheterization, interventional radiology, orthopedic reduction, and device closure AAST Iatrogenic 2024. The common femoral artery is the predominant site of access-related injury, with lesions including pseudoaneurysm, arteriovenous fistula, hematoma, thrombosis, and closure-device failure.

Pediatric vascular trauma epidemiology depends heavily on patient age and mechanism:

• Infants and toddlers present most frequently with iatrogenic catheter-related arterial injury Branco 2014 · FLANIGAN 1983.
• Older children and adolescents present primarily following penetrating mechanisms, road traffic accidents, and falls South India Pediatric Trauma 2025 · Pediatric Trauma Aetiology 2020.

Extremity ischemia in children is frequently one component of a polytrauma pattern, where concurrent hemorrhage, fractures, and head injury drive overall mortality Tanzania Registry 2022 · South India Pediatric Trauma 2025. Vascular injuries in both populations manifest clinically with absent pulses, distal ischemia, expanding hematoma, bruit, thrill, neurologic deficit, or hemodynamic instability AAST Iatrogenic 2024.

67.2Anatomy and injury prevention

Procedural technique directly influences the incidence of iatrogenic injury. Routine ultrasound guidance for femoral and radial arterial access is associated with lower rates of pseudoaneurysm, arteriovenous fistula, and hematoma compared with anatomical landmark technique AAST Iatrogenic 2024. Operator and institutional procedural volume is a further modifiable determinant of access-site complication rates, alongside ultrasound guidance. The transition from femoral to radial access for cardiovascular interventions reduces groin complications but introduces distinct patterns of radial artery occlusion and forearm hematoma.

Orthopedic reduction maneuvers carry proximity risks to adjacent vessels. Femoral neck fracture reduction exposes the femoral vessels to direct injury, while pediatric supracondylar humerus fracture reduction carries a recognized risk of brachial artery compromise Branco 2014 · Yeganeh 2025. In the pediatric population, assessment accounts for unique physiology and anatomy, including vasospasm, small vessel diameter, and the presence of underlying congenital variants such as persistent sciatic artery, arteria lusoria, or anomalous renal artery origins PROOVIT Pediatric 2022.

67.3Diagnosis and resuscitation

Resuscitation in hemodynamically unstable pediatric trauma relies on a balanced 1:1:1 plasma, platelet, and red blood cell transfusion protocol scaled to body weight, triggered by physiologic markers analogous to adult criteria Low-Value Pediatric Practices 2024. Obesity modifies the physiologic response and necessitates adjusted resuscitation dosing and operative planning Obesity Pediatric Trauma 2017.

In stable adults with suspected common femoral pseudoaneurysm or arteriovenous fistula, duplex ultrasound is the definitive initial diagnostic test AAST Iatrogenic 2024. Cross-sectional imaging is reserved for complex operative fields or deep anatomic injury. Pediatric imaging algorithms weigh diagnostic utility against radiation exposure, favoring ultrasound and selective magnetic resonance angiography for stable extremity evaluation and reserving computed tomography angiography for instability or major operative planning Low-Value Pediatric Practices 2024.

67.4Adult iatrogenic trauma management

Management of adult iatrogenic access injuries is determined by lesion size, morphologic suitability for percutaneous intervention, and the presence of ischemia or instability. Small pseudoaneurysms close spontaneously, whereas expanding lesions or high-flow fistulae mandate closure.

The stepwise management logic for common femoral access injury proceeds as follows:

1. Define the lesion size, neck morphology, and flow characteristics using duplex ultrasound.
2. Observe stable pseudoaneurysms below 2 cm without ischemia.
3. Attempt ultrasound-guided thrombin injection for larger, stable pseudoaneurysms. This achieves higher first-attempt success and shorter closure times than compression therapy, with a low incidence of distal embolization Thrombin Injection 2020. Inject bovine thrombin at 1000 IU/mL in small aliquots under continuous duplex visualization, advancing slowly into the sac until flow ceases; the mean effective dose is roughly 400 to 500 units, and single-injection primary success runs about 92 to 94 percent with distal thromboembolism under 1 percent Krueger 2005. Reserve it for a lesion with a defined narrow neck and no coexisting arteriovenous fistula AAST Iatrogenic 2024.
4. Perform open surgical repair for large pseudoaneurysms, true arteriovenous fistulae, expanding hematomas, or lesions failing percutaneous management AAST Iatrogenic 2024.
5. Deploy endovascular covered stents exclusively for anatomically suitable lesions in patients with hostile surgical fields or prohibitive operative risk AAST Iatrogenic 2024.

67.5Pediatric vascular trauma management

Pediatric vascular reconstruction avoids synthetic conduits to prevent future anastomotic narrowing caused by somatic growth. Ischemia resulting from vasospasm rather than structural disruption is managed medically when perfusion is adequate, avoiding unnecessary surgical exploration. After closed reduction of a supracondylar humerus fracture, the pulse alone does not decide the operation. A pink pulseless hand that stays warm and well perfused with brisk capillary refill can be admitted for close vascular observation, whereas a white pulseless hand that is cool with sluggish or absent capillary refill, or a hand that loses perfusion after reduction, mandates urgent exploration and brachial artery repair Griffin 2008.

Procedural logic for pediatric extremity trauma prioritizes limb preservation and growth accommodation:

1. Confirm whether ischemia is driven by definitive structural injury or vasospasm; manage suspected vasospasm with warm irrigation and vasodilators when distal perfusion remains viable Branco 2014.
2. For iatrogenic catheter-induced ischemia in infants, initiate systemic anticoagulation and remove the catheter, advancing to revascularization only for limb-threatening deficits Branco 2014.
3. Perform open surgical repair using loupe or microscope magnification and fine monofilament suture (8-0 or 9-0) PROOVIT Pediatric 2022.
4. Use autologous vein as the universal workhorse conduit, accepting synthetic grafts only in the absolute absence of autologous options Branco 2014.

67.6Surveillance and follow-up

Observation of adult iatrogenic trauma mandates serial duplex ultrasound surveillance to confirm pseudoaneurysm stability, thrombosis, or resolution AAST Iatrogenic 2024. Pediatric follow-up is organized around growth. Excellent early limb-salvage rates must be monitored against the long-term risk of anastomotic stenosis, recurrent ischemia, and limb length discrepancy as somatic growth outpaces the initial repair PROOVIT Pediatric 2022 · Branco 2014.

67.7Areas of controversy

Pediatric deployment of resuscitative endovascular balloon occlusion of the aorta (REBOA) remains constrained by a lack of pediatric-specific trials, limits in equipment sizing for young children, and uncertainty regarding selection criteria. Current utilization is primarily extrapolated from adult paradigms and is heavily concentrated in adolescent cohorts treated at major pediatric trauma centers with adult-trauma collaboration Kuo 2024 · Pediatric REBOA Barriers · 2024.

Management of blunt thoracic aortic injury in children lacks dedicated pediatric trial support. The choice among surveillance, medical management, open repair, and endovascular therapy is informed by adapting adult principles, though specific diameter and interventional thresholds remain unsettled PROOVIT Pediatric 2022 · Pediatric Trauma Aetiology 2020.

Intra-pericardial thrombin injection has been reported as a bailout strategy for iatrogenic pericardial tamponade complicating cardiac interventions. Its evidentiary status remains limited to salvage case-series experience, and it is not a standard vascular therapy Intrapericardial Thrombin 2023.