Iatrogenic and Pediatric Vascular Trauma

67.1Separate adult iatrogenic and pediatric lanes

Iatrogenic vascular injury and pediatric vascular trauma belong in the same chapter because both demand discipline at the moment of recognition: the surgeon must separate what is known, what is inferred from adult experience, and what is truly supported in the patient in front of them. In adults, most iatrogenic injuries arise in a procedural context—cardiac catheterization, vascular intervention, interventional radiology, orthopedic reduction, or device closure—and the first question is whether the lesion is stable, anatomically defined, and suitable for local treatment or requires operative exposure. In children, the same vocabulary of hard signs, soft signs, ischemia, pseudoaneurysm, thrombosis, and arteriovenous fistula applies, but the consequences of small vessel diameter, vasospasm, growth, and limited conduit choices change both the threshold for intervention and the follow-up obligation Iatrogenic arterial injury 2022 · Pediatric extremity vascular 2022 · AAST iatrogenic vascular 2024 · AAST PROOVIT pediatric 2022 · Pediatric extremity vascular 2014.

A practical pediatric assessment must be framed separately. A pulseless child after supracondylar humerus fracture reduction, an infant with acute limb ischemia after arterial catheterization, and an adolescent with penetrating extremity trauma are not variants of the same adult problem. Pediatric registry analyses show that older children and adolescents more often present after penetrating mechanisms, whereas iatrogenic catheter-related arterial injury contributes substantially to infant and toddler cohorts Pediatric extremity vascular 2022 · Pediatric extremity vascular 2014 · Experience latrogenic pediatric 1983. In supracondylar humerus fracture, an absent or weak radial pulse after reduction should trigger urgent vascular evaluation, with operative exploration selected according to perfusion status rather than pulse status alone.

A practical adult iatrogenic assessment begins with the procedural event. The trainee should document the access site or operative field, anticoagulation status if known, the timing of swelling or bleeding, pulse examination, neurologic status, and whether there is bruit, thrill, expanding hematoma, distal ischemia, or hemodynamic instability. The common femoral artery remains a dominant site of access-related injury, and the expected lesion set includes pseudoaneurysm, arteriovenous fistula, hematoma, thrombosis, and closure-device failure Iatrogenic arterial injury 2022 · AAST iatrogenic vascular 2024 · Iatrogenic femoral artery 2014 · Ultrasound-guided thrombin injection 2020. The decision-changing test in a stable patient is duplex ultrasound when the question is femoral pseudoaneurysm or arteriovenous fistula; cross-sectional imaging is reserved for anatomy that cannot be defined by ultrasound, complex operative fields, or suspected deeper injury.

Blunt thoracic vascular injury in children is uncommon relative to adult trauma cohorts, and management is necessarily informed by adapted adult principles rather than pediatric trial evidence. This matters at the bedside because the surgeon should not overstate certainty when recommending surveillance, medical management, open repair, or endovascular repair in a child with thoracic aortic injury. The note should state the child’s hemodynamic status, associated injuries, imaging findings, size and location of the vascular abnormality, and the reason the selected strategy is appropriate despite limited pediatric-specific evidence AAST PROOVIT pediatric 2022 · Pediatric extremity vascular 2014 · Paediatric trauma aetiology 2020. The best resident will also document which adult assumptions are being applied and which pediatric features—diameter, access, growth, and long-term device implications—alter the plan Pediatric extremity vascular 2022.

Pediatric extremity reconstruction is also not simply smaller adult reconstruction. Vasospasm is a recognized feature of pediatric arterial injury and may improve with warm irrigation and topical or systemic vasodilator treatment when ischemia is incomplete and limb perfusion remains adequate Pediatric extremity vascular 2022 · AAST PROOVIT pediatric 2022 · Pediatric extremity vascular 2014. When reconstruction is required, vessel-size-appropriate technique, magnification, and vein interposition are favored, with avoidance of synthetic conduit when possible because somatic growth can convert a technically successful repair into a late stenosis problem. The operative note should record vessel size, conduit source, magnification used, anastomotic configuration, completion perfusion assessment, and the surveillance plan, because late follow-up is part of the operation in a growing child.

67.2Adult access data inform surveillance, not pediatric claims

Adult iatrogenic access literature is useful because it teaches lesion behavior, surveillance discipline, and thresholds for escalation, but it should not be used to make unsupported pediatric claims. In adults with femoral access injury, the common management spectrum includes observation, ultrasound-guided thrombin injection, surgical repair, and selected covered stent placement depending on lesion morphology Iatrogenic arterial injury 2022 · Iatrogenic femoral artery 2014 · Ultrasound-guided thrombin injection 2020. The clinical sequence is straightforward: define the lesion, decide whether it is stable and anatomically suitable for nonoperative or percutaneous treatment, document why the chosen treatment fits the lesion, and arrange surveillance that can detect enlargement, persistent flow, thrombosis, or recurrent communication.

Small iatrogenic femoral pseudoaneurysms in stable adults may close spontaneously, and a size below 2 cm is a commonly used threshold for considering observation with serial ultrasound surveillance Iatrogenic arterial injury 2022 · Iatrogenic femoral artery 2014 · Ultrasound-guided thrombin injection 2020. That threshold should not be copied into pediatric care without judgment, because pediatric artery diameter, vasospasm, catheter mechanism, and limb perfusion reserve are different Pediatric extremity vascular 2022 · AAST PROOVIT pediatric 2022 · Pediatric extremity vascular 2014. For the adult patient selected for observation, the note should make the conservative decision explicit: pseudoaneurysm size, neck morphology if known, absence of expansion, absence of distal ischemia, absence of high-flow fistula physiology, and a defined ultrasound follow-up plan.

When treatment is required for adult femoral pseudoaneurysm, ultrasound-guided thrombin injection has higher first-attempt success and shorter time to closure than ultrasound-guided compression therapy, with low reported rates of distal embolic or arterial-thrombosis complications Iatrogenic femoral artery 2014 · Ultrasound-guided thrombin injection 2020. The practical teaching point is that the lesion must be suitable: the operator should identify the sac, flow pattern, relationship to the native artery, and whether the anatomy is more consistent with a pseudoaneurysm alone or a combined pseudoaneurysm and arteriovenous fistula Iatrogenic arterial injury 2022. The resident should not describe thrombin injection as a generic treatment for all groin masses after catheterization; it is a lesion-specific intervention for a defined pseudoaneurysm in a patient whose anatomy and clinical status support percutaneous closure.

Adult iatrogenic arteriovenous fistula after femoral access is recognized clinically by bruit or thrill and anatomically by ultrasound demonstration of arterial-to-venous communication with high-flow physiology Iatrogenic arterial injury 2022 · Iatrogenic femoral artery 2014 · Ultrasound-guided thrombin injection 2020. Some fistulae may be followed when small and clinically stable, but persistent high-flow communication, symptoms, enlargement, or failure to close should move the patient toward definitive treatment with surgical repair or selected covered stent repair. Covered stent placement is a recognized endovascular option for iatrogenic injuries in selected arterial segments, including proximal subclavian and axillary injuries and selected common femoral injuries where caution is required; its attraction is avoidance of difficult operative exposure in high-risk patients or hostile operative fields AAST iatrogenic vascular 2024.

Pediatric surveillance is governed by a different logic. The AAST PROOVIT pediatric vascular trauma experience described a case-mix dominated by lower-extremity vascular injury, vein interposition as the leading reconstruction technique, and limb-salvage outcomes broadly comparable to adult cohorts when ischemia time is short AAST PROOVIT pediatric 2022 · Pediatric extremity vascular 2014 · Paediatric trauma aetiology 2020. The follow-up question after pediatric repair is not only whether the artery is patent today; it is whether the repair will remain adequate as the child grows, whether an anastomosis is narrowing, whether limb growth is symmetric, and whether a conduit choice made under emergency conditions will require later revision Pediatric extremity vascular 2022. This is where adult access data help the surgeon remember to image and document, but pediatric biology determines what the surveillance means.

Iatrogenic femoral injury outside the catheterization suite should also be anticipated. A cadaveric study of femoral neck fracture reduction emphasized the anatomic proximity of femoral vessels to the operative field and the maneuvers that elevate iatrogenic injury risk Iatrogenic Vascular Injury 2025. The clinical implication is not that every orthopedic reduction requires vascular imaging; it is that new bleeding, groin swelling, loss of pulse, unexplained hypotension, or postoperative bruit after a high-risk maneuver deserves immediate vascular assessment. Pediatric imaging should remain selective: a 2024 analysis of low-value pediatric trauma practices frames routine unsupported imaging and interventions as a deimplementation target, and pediatric vascular imaging should weigh the diagnostic value of CT angiography against radiation exposure, using ultrasound or selective MR angiography when feasible and reserving CT for instability or anatomic complexity Pediatric extremity vascular 2022 · Low-Value Clinical Practices 2024 · Paediatric trauma aetiology 2020.

67.3Device use needs governance

Device use in iatrogenic and pediatric vascular trauma requires institutional governance because the risks are distributed across specialties. Arterial access, closure devices, covered stents, pediatric catheters, thrombin injection, and REBOA are not merely technical tools; they are systems problems involving credentialing, imaging standards, equipment availability, disclosure expectations, and quality review Iatrogenic arterial injury 2022 · AAST iatrogenic vascular 2024 · Iatrogenic femoral artery 2014. The iatrogenic vascular injury burden has shifted with the growth of transcatheter cardiovascular interventions, making high-volume catheterization laboratories and interventional radiology programs appropriate targets for quality-improvement pathways.

For arterial access, the most important governance principle is that preventable complications should be reduced before rescue techniques are celebrated. Ultrasound guidance for femoral and radial arterial access is associated with lower rates of pseudoaneurysm, arteriovenous fistula, and hematoma compared with landmark-only technique, supporting routine ultrasound use across interventional disciplines Iatrogenic arterial injury 2022 · AAST iatrogenic vascular 2024 · Iatrogenic femoral artery 2014. Operator volume and ultrasound guidance are dominant modifiable risk factors in arterial access complication rates, and the transition from femoral to radial cardiac catheterization has reduced access-site hematoma and pseudoaneurysm while introducing smaller numbers of radial-artery occlusion and forearm hematoma. A serious program tracks both femoral and radial complications rather than assuming that changing access site eliminates iatrogenic injury.

Closure-device failure deserves the same governance attention as needle puncture. Vascular closure-device failures after percutaneous arterial access are recognized mechanisms of iatrogenic injury, and bailout management may include manual compression, surgical repair, or endovascular salvage depending on the failure mode and lesion morphology Iatrogenic arterial injury 2022 · AAST iatrogenic vascular 2024 · Iatrogenic femoral artery 2014. The resident should learn to ask what device was used, whether deployment was intraluminal or extraluminal, whether there is limb ischemia, whether the common femoral artery was punctured at an appropriate site, and whether duplex or cross-sectional imaging demonstrates thrombosis, dissection, pseudoaneurysm, or fistula. The institution should expect a structured handoff from the procedural service to vascular surgery when the complication is recognized.

In children, device governance begins with size. Catheter-related iatrogenic arterial injury in infants and small children is a recognized cause of acute limb ischemia, with management including systemic anticoagulation, catheter removal, and selective revascularization when ischemia is severe or perfusion is limb-threatening Pediatric extremity vascular 2022 · Pediatric extremity vascular 2014 · Experience latrogenic pediatric 1983. When reconstruction is necessary, pediatric vascular repair may require loupe or microscope magnification, 8-0 or 9-0 monofilament suture, and vein interposition from contralateral or arm veins as workhorse conduit AAST PROOVIT pediatric 2022. Congenital anatomic variants, including persistent sciatic artery, arteria lusoria, and anomalous renal artery origin, should be considered when the anatomy or injury pattern is atypical; cross-sectional imaging can clarify anatomy before reconstruction when the child is stable enough for it.

Pediatric trauma systems need governance as much as devices do. Road traffic injury is a leading mechanism in pediatric trauma cohorts, with severity and mortality shaped by prehospital system maturity and access to trauma centers Pediatric trauma burden 2022 · Paediatric trauma aetiology 2020. Prospective Tanzanian registry data described high mortality concentrated in road traffic injury and falls, with prehospital triage and emergency transport barriers limiting timely vascular trauma care. Data from Gondar described prehospital delay and limited blood-product availability as drivers of preventable mortality, and pediatric prehospital care depends on weight-based equipment, age-adjusted physiological targets, and rapid transfer to pediatric-capable centers when possible Magnitude mechanism outcome 2023.

The best pediatric vascular trauma model is collaborative. Pediatric vascular trauma readiness depends on co-located pediatric surgery, anesthesiology, and vascular-surgery resources, with adult-pediatric collaboration being the dominant configuration outside dedicated pediatric trauma centers AAST PROOVIT pediatric 2022 · Pediatric extremity vascular 2014 · Paediatric trauma aetiology 2020. Trauma-team activation data from a Swiss pediatric emergency department show how activation patterns, mechanism distribution, and admission disposition can inform triage refinement and team-resource allocation Pediatric Trauma Trauma 2023. Obesity adds another layer of planning because it is associated with distinct injury patterns and altered physiologic response in pediatric trauma, affecting resuscitation dosing, imaging interpretation, and operative planning Obesity pediatric trauma. 2017. After an iatrogenic injury, disclosure to the patient and family is a standard professional and ethical practice, paired with patient-safety reporting, documentation, and quality-improvement review Iatrogenic arterial injury 2022 · AAST iatrogenic vascular 2024.

67.4Clinical integration, follow-up, and evidence boundaries

Clinical integration begins with honest triage. Pediatric trauma cohorts from multiple settings consistently identify road traffic injury and falls as dominant mechanisms, with limb injuries frequent and head injury contributing disproportionate mortality in some series Patterns Prevalence Outcomes 2025. For the vascular surgeon, this means that extremity ischemia is often one part of a broader pediatric injury pattern, and the vascular plan must be coordinated with hemorrhage control, fracture stabilization, head injury management, and transport realities Pediatric trauma burden 2022. Preventable mortality is concentrated in delayed hemorrhage recognition, inadequate transfusion availability, and prehospital transport delays, and registries are useful because they identify where system changes can save children before a vascular surgeon ever reaches the bedside Magnitude mechanism outcome 2023.

Resuscitation and imaging should be purposeful. Pediatric balanced massive-transfusion practice uses plasma, platelets, and red blood cells in a 1:1:1 ratio scaled to body weight, triggered by physiologic markers analogous to adult criteria Pediatric extremity vascular 2022 · Low-Value Clinical Practices 2024 · Paediatric trauma aetiology 2020. Imaging should answer a management question: CT angiography is appropriate when instability, complex anatomy, or operative planning demands it, while ultrasound and selective MR angiography are preferred when feasible in stable children because routine unsupported imaging is a low-value practice target in pediatric trauma systems. The resident should write why the test was ordered, what decision it will change, and what finding will lead to operation, endovascular treatment, observation, or transfer.

REBOA illustrates the boundary between adult enthusiasm and pediatric evidence. Pediatric use remains constrained by training gaps, equipment-sizing limitations, selection-criteria uncertainty, limited pediatric trial data, and lessons from contemporary adult experience that encourage cautious deployment Analysis current usage 2024 · Utilization REBOA pediatric 2024. Reported pediatric deployments cluster at major pediatric trauma centers with adult-trauma collaboration, and the treated population is concentrated more in adolescents than infants or young children. A pediatric REBOA policy should therefore specify age and size considerations, operator credentialing, hemorrhage pattern, access plan, zone selection logic, monitoring expectations, and removal or conversion strategy rather than relying on ad hoc extrapolation.

For adult iatrogenic injury, follow-up is lesion-specific and escalation should be explicit. The AAST PROOVIT iatrogenic vascular injury analysis described percutaneous arterial access for cardiac, vascular, and interventional procedures as leading sources, with the femoral artery as the predominant injury site and pseudoaneurysm as the dominant late finding Iatrogenic arterial injury 2022 · AAST iatrogenic vascular 2024 · Iatrogenic femoral artery 2014. Surgical repair remains the default for large pseudoaneurysms, arteriovenous fistulae, and access-site injuries that fail thrombin injection, with patch angioplasty, lateral arteriorrhaphy, or interposition used according to the defect Ultrasound-guided thrombin injection 2020. Intrapericardial thrombin injection has been described as a bailout strategy for iatrogenic pericardial tamponade after cardiac interventions, but its evidentiary position is salvage case-series experience rather than routine vascular practice Intra-pericardial thrombin injection 2023.

For pediatric extremity vascular trauma, follow-up must protect both patency and development. Registry analyses describe pediatric limb-salvage outcomes after extremity vascular trauma as comparable to or better than adult cohorts, supported by healing potential, low atherosclerotic burden, and the importance of avoiding secondary nerve injury Pediatric extremity vascular 2022 · Pediatric extremity vascular 2014 · Experience latrogenic pediatric 1983. That favorable expectation should not make the surgeon casual: repaired children need surveillance for stenosis, occlusion, recurrent symptoms, and growth-related mismatch at anastomoses or conduit segments AAST PROOVIT pediatric 2022. The trainee should tell the family, in plain language, that today’s pulse is not the end point; the repair must remain satisfactory as the child grows.

The evidence boundary should be visible in the chapter’s practice. Historical pediatric iatrogenic vascular injury experience established the descriptive framework of incidence, etiology, management, and outcome, but modern practice now includes different catheter platforms, closure devices, endovascular rescue options, trauma systems, and expectations for disclosure Iatrogenic arterial injury 2022 · AAST iatrogenic vascular 2024 · Experience latrogenic pediatric 1983. A 2024 low-value pediatric trauma analysis supports deimplementation of unsupported imaging and intervention patterns, while modern iatrogenic vascular trauma analyses support surveillance of procedural trends as transcatheter interventions grow Pediatric extremity vascular 2022 · Low-Value Clinical Practices 2024 · Paediatric trauma aetiology 2020. The mature surgeon is therefore neither nihilistic nor aggressive by habit: observe when the lesion is small and stable, intervene when anatomy or physiology demands it, disclose iatrogenic harm plainly, and build follow-up around the patient’s future risk rather than the operator’s immediate relief AAST PROOVIT pediatric 2022 · Pediatric extremity vascular 2014 · Iatrogenic femoral artery 2014 · Ultrasound-guided thrombin injection 2020.