Western Trauma Association Critical Decisions in Trauma: Evaluation and management of peripheral vascular injury, Part II

Diagnostic angiography for identification and management of late vascular injuries in war-related traumatic peripheral vascular injuries: A retrospective cohort study

PURPOSE

One of the feared complications of war-related peripheral vascular injury is the development of delayed hemorrhage. This study describes our experience with an innovative protocol of surveillance diagnostic angiography to detect occult late vascular complications in an effort to prevent delayed hemorrhage.

MATERIALS AND METHODS

This retrospective cohort study was conducted at a single level one trauma center, reviewing patients with war-related peripheral vascular injuries caused by penetrating trauma from October 7th, 2023, to January 21st, 2024. Data collected included patient demographics, primary injury characteristics, associated complications, incidence of late vascular injuries (either symptomatic or occult), means of diagnosis, treatment strategies and outcomes.

RESULTS

The cohort included 41 patients with war-related peripheral vascular injuries affecting 51 limbs. All patients were male (100%) with a median age of 25 years, the majority being soldiers (85%). 24 occurrences of late vascular injuries were observed in 22 (43%) out of 51 limbs (100%). Half were symptomatic, with delayed hemorrhage occurring in 5 limbs in total (10%), and half were asymptomatic. A total of 17 surveillance diagnostic angiographies were performed with the sole indication of identifying occult late vascular injuries in asymptomatic patients, of which 4 (24%) were positive for findings. Five additional diagnostic angiographies were performed to assess late injuries discovered incidentally on imaging studies that were performed for other indications, and all were positive for late vascular injuries. Of all late vascular injuries, a total of 83% required subsequent treatment.

CONCLUSIONS

Late vascular injuries are a potentially lethal complication of war-related peripheral vascular injury. Aggressive surveillance with diagnostic angiography prior to discharge from a high intensity care unit can detect asymptomatic late vascular injuries, the treatment of which may prevent life-threatening hemorrhage.

Endovascular surgery in the French role 3 medical treatment facility: Is there a need? A 10-year retrospective analysis

OBJECTIVE

Vascular surgery for war-related traumatic injuries represents 3 to 17.6 % of all emergency surgical procedures, and around 5 % in French Medical Treatment Facilities (MTFs). Most of these lesions are treated by open surgery, but the role of endovascular surgery in French MTFs has not been assessed yet. The aims of this study are to assess the possible role of endovascular surgery by describing vascular surgical management in recent conflicts, and identify potential gaps in vascular surgery training.

METHODS

Data were extracted from the OPEX® registry, which recorded all surgical activity during deployment from 2011 to 2021. All patients treated in French Role 2 Enhanced or 3 MTFs requiring emergency surgery for peripheral vascular injury were included. The mechanism of injury, type of vascular injury and surgical management were reported. Patients eligible to receive endovascular surgery were described as a subgroup, and surgical management was described according to surgeon's specialty.

RESULTS

Out of the 2137 patients admitted for emergency or delayed emergency surgery, we reported 21 patients (0.98 %) with peripheral vascular injuries requiring emergency surgery, of which 19 (90.5 %) with at least one arterial lesion. Most injuries were combat-related (n = 18 [86 %]). Arterial injuries involved mainly femoral (n = 8 [38.1 %]) or humeral (n = 5 [23.8 %]) arteries, primarily handled by vascular shunting or bypass. Arteriography before or after surgery was not a was not common practice (n = 4 [19 %]). Six patients (28.6 %) were deemed eligible for endovascular surgery.

CONCLUSION

Peripheral vascular lesion requiring emergency surgery are relatively uncommon in French MTFs. However, they require specific surgical training to deal with their complexity. Endovascular surgery does not appear to offer sufficient benefit for systematic deployment in French MTFs, and pre- and post-operative arteriography may be of interest for diagnostic use. The establishment of a French vascular mobile unit for complex cases may be of interest.

Experience of vascular injuries at a military hospital in Korea

PURPOSE

Vascular injuries require immediate surgical treatment with standard vascular techniques. We aimed to identify pitfalls in vascular surgery for trauma team optimization and to suggest recommendations for trauma and vascular surgeons.

METHODS

We reviewed 28 victims and analyzed the patterns of injuries, methods of repair, and outcomes.

RESULTS

Ten patients had torso injuries, among whom three thoracic aorta injuries were repaired with thoracic endovascular aortic repair, one left hepatic artery pseudoaneurysm with embolization, and two inferior vena cava with venorrhaphy, three iliac arteries with patch angioplasty or embolization, and three common femoral arteries with bypass surgery or arterioplasty. Four patients had upper extremity injuries, among whom one brachial artery and vein was repaired with bypass surgery after temporary intravascular shunt perfusion, two radial arteries were repaired with anastomoses, and one ulnar artery was repaired with ligation. One radial artery under tension was occluded. Fourteen patients had lower extremity injuries, among whom one superficial femoral artery and vein was repaired with bypass and concomitant ligation of the deep femoral artery and vein, three superficial femoral arteries were repaired with bypass (two concomitant femoral veins with bypass or anastomosis), one deep femoral artery with embolization, two popliteal arteries with bypass or anastomosis, four infrapopliteal transected arteries, one arteriovenous fistula with ligation, and one pseudoaneurysm with bypass. However, one superficial femoral artery and all femoral veins were occluded. One leg replantation failed.

CONCLUSIONS

There are potential complications of vascular access during resuscitative endovascular balloon occlusion of the aorta procedures. Vascular repair should be performed without tension or spasm. Preservation of the harvested vein in papaverine solution and blood while using a temporary intravascular shunt is a method of eliminating spasms.

CTA Imaging of Peripheral Arterial Injuries

Traumatic vascular injuries consist of direct or indirect damage to arteries and/or veins and account for 3% of all traumatic injuries. Typical consequences are hemorrhage and ischemia. Vascular injuries of the extremities can occur isolated or in association with major trauma and other organ injuries. They account for 1-2% of patients admitted to emergency departments and for approximately 50% of all arterial injuries. Lower extremities are more frequently injured than upper ones in the adult population. The outcome of vascular injuries is strictly correlated to the environment and the time background. Treatment can be challenging, notably in polytrauma because of the dilemma of which injury should be prioritized, and treatment delay can cause disability or even death, especially for limb vascular injury. Our purposes are to discuss the role of computed tomography angiography (CTA) in the diagnosis of vascular trauma and its optimized protocol to achieve a definitive diagnosis and to assess the radiological signs of vascular injuries and the possible pitfalls.

Long-term outcomes of autologous vein bypass for repair of upper and lower extremity major arterial trauma

OBJECTIVE

Autologous vein is the preferred bypass conduit for extremity arterial injuries owing to superior patency and low infection risk; however, long-term data on outcomes in civilians are limited. Our goal was to assess short- and long-term outcomes of autologous vein bypass for upper and lower extremity arterial trauma.

METHODS

A retrospective review was performed of patients with major extremity arterial injuries (2001-2019) at a level I trauma center. Demographics, injury and intervention details, and outcomes were recorded. Primary outcomes were primary patency at 1 year and 3 years. Secondary outcomes were limb function at 6 months, major amputation, and mortality. Multivariable analysis determined risk factors for functional impairment.

RESULTS

There were 107 extremity arterial injuries (31.8% upper and 68.2% lower) treated with autologous vein bypass. Mechanism was penetrating in 77% of cases, of which 79.3% were due to firearms. The most frequently injured vessels were the common and superficial femoral (38%), popliteal (30%), and brachial arteries (29%). For upper extremity trauma, concomitant nerve and orthopedic injuries were found in 15 (44.1%) and 11 (32.4%) cases, respectively. For lower extremities, concomitant nerve injuries were found in 10 (13.7%) cases, and orthopedic injuries in 31 (42.5%). Great saphenous vein was the conduit in 96% of cases. Immediate intraoperative bypass revision occurred in 9.3% of patients, most commonly for graft thrombosis. The in-hospital return to operating room rate was 15.9%, with graft thrombosis (47.1%) and wound infections (23.5%) being the most common reasons. The median follow-up was 3.6 years. Kaplan-Meier analysis showed 92% primary patency at 1 year and 90% at 3 years. At 6 months, 36.1% of patients had functional impairment. Of patients with functional impairment at 6 months, 62.9% had concomitant nerve and 60% concomitant orthopedic injuries. Of those with nerve injury, 91.7% had functional impairment, compared with 17.8% without nerve injury (P < .001). Of patients with orthopedic injuries, 51.2% had functional impairment, vs 25% of those without orthopedic injuries (P = .01). On multivariable analysis, concomitant nerve injury (odds ratio, 127.4; 95% confidence interval, 17-957; P <. 001) and immediate intraoperative revision (odds ratio, 11.03; 95% confidence interval, 1.27-95.55; P = .029) were associated with functional impairment.

CONCLUSIONS

Autologous vein bypass for major extremity arterial trauma is durable; however, many patients have long-term limb dysfunction associated with concomitant nerve injury and immediate intraoperative bypass revision. These factors may allow clinicians to identify patients at higher risk for functional impairment, to outline patient expectations and direct rehabilitation efforts toward improving functional outcomes.

Three-dimensional printing and decellularized-extracellular-matrix based methods for advances in artificial blood vessel fabrication: A review

Blood vessels are the tubes through which blood flows and are divided into three types: millimeter-scale arteries, veins, and capillaries as well as micrometer-scale capillaries. Arteries and veins are the conduits that carry blood, while capillaries are where blood exchanges substances with tissues. Blood vessels are mainly composed of collagen fibers, elastic fibers, glycosaminoglycans and other macromolecular substances. There are about 19 feet of blood vessels per square inch of skin in the human body, which shows how important blood vessels are to the human body. Because cardiovascular disease and vascular trauma are common in the population, a great number of researches have been carried out in recent years by simulating the structures and functions of the person's own blood vessels to create different levels of tissue-engineered blood vessels that can replace damaged blood vessels in the human body. However, due to the lack of effective oxygen and nutrient delivery mechanisms, these tissue-engineered vessels have not been used clinically. Therefore, in order to achieve better vascularization of engineered vascular tissue, researchers have widely explored the design methods of vascular systems of various sizes. In the near future, these carefully designed and constructed tissue engineered blood vessels are expected to have practical clinical applications. Exploring how to form multi-scale vascular networks and improve their compatibility with the host vascular system will be very beneficial in achieving this goal. Among them, 3D printing has the advantages of high precision and design flexibility, and the decellularized matrix retains active ingredients such as collagen, elastin, and glycosaminoglycan, while removing the immunogenic substance DNA. In this review, technologies and advances in 3D printing and decellularization-based artificial blood vessel manufacturing methods are systematically discussed. Recent examples of vascular systems designed are introduced in details, the main problems and challenges in the clinical application of vascular tissue restriction are discussed and pointed out, and the future development trends in the field of tissue engineered blood vessels are also prospected.

Lower Extremity Vascular Injury in the Pediatric Trauma Patient: Management and Outcomes at an Adult Level I Trauma Center

BACKGROUND

Traumatic vascular injuries of the lower extremity in the pediatric population are uncommon but can result in significant morbidity. The objective of this study is to demonstrate our experience with these injuries by describing patterns of traumatic vascular injury, the initial management, and data regarding early outcomes.

METHODS

In total, 506 patients presented with lower extremity vascular injury between January 1, 2009 and January 1, 2021 to Grady Memorial Hospital, an urban, adult Level I trauma center in Atlanta, Georgia. Thirty-two of the 506 patients were aged less than 18 years and were evaluated for a total of 47 lower extremity vascular injuries. To fully elucidate the injury patterns and clinical course in this population, we examined patient demographics, mechanism of injury, type of vessel injured, surgical repair performed, and early outcomes and complications.

RESULTS

The median (interquartile range) age was 16 (2) years (range, 3-17 years), and the majority were male (n = 29, 90.6%). Of the vascular injuries identified, 28 were arterial and 19 were venous. Of these injuries, 14 patients had combined arterial-venous injuries. The majority of injuries were the result of a penetrating injury (n = 28, 87.5%), and of these, all but 2 were attributed to gunshot wounds. Twenty-seven vascular interventions were performed by nonpediatric surgeons: 11 by trauma surgeons, 13 by vascular surgeons, 2 by orthopedic surgeons, and 1 by an interventional radiologist. Two patients required amputation: 1 during the index admission and 1 delayed at 3 months. Overall survival was 96.9%.

CONCLUSIONS

Vascular injuries as the result of trauma at any age often require early intervention, and we believe that these injuries in the pediatric population can be safely managed in adult trauma centers with a multidisciplinary team composed of trauma, vascular, and orthopedic surgeons with the potential to decrease associated morbidity and mortality from these injuries.

Management of Vascular Injuries in Penetrating Trauma

Management of vascular trauma remains a challenge and traumatic injuries result in significant morbidity and mortality. Vascular trauma can be broadly classified according to mechanism of injury (iatrogenic, blunt, penetrating, and combination injuries). In addition, this can be further classified by anatomical area (neck, thoracic, abdominal, pelvic, and extremities) or contextual circumstances (civilian and military).

Major vascular traumas to the neck, upper limbs, and chest: Clinical presentation, diagnostic approach, and management strategies

Major vascular traumas to the neck, upper limbs, and chest may arise from penetrating and/or blunt mechanisms, resulting in a range of clinical scenarios. Lesions to the carotid arteries may also lead to neurologic complications, such as stroke. The increasing use of invasive arterial access for diagnostic and/or interventional purposes has increased the rate of iatrogenic injuries, which usually occur in older and hospitalized patients. Bleeding control and restoration of perfusion represent the two main goals of treatment for vascular traumatic lesions. Open surgery still represents the gold standard for most lesions, although endovascular approaches have increasingly emerged as feasible and effective options, particularly for management of subclavian and aortic injuries. In addition to advanced imaging (including ultrasound, contrast-enhanced cross-sectional imaging, and arteriography) and life support measures, multidisciplinary care is required, particularly in the setting of concomitant injuries to the bones, soft tissues, or other vital organs. Modern vascular surgeons should be familiar with the whole armamentarium of open and endovascular techniques needed to manage major vascular traumas safely and promptly.

Gelatin/sodium alginate hydrogel-coated decellularized porcine coronary artery to construct bilayer tissue engineered blood vessels

Cardiovascular diseases and vascular trauma can be commonly found in the population. Scholars worldwide hope to develop small-diameter vascular grafts that can replace autologous vessels for clinical use. Decellularized blood vessels can retain the original morphology, structure, and physical properties of blood vessels, which is conducive to cell growth, proliferation, and differentiation. In this study, porcine coronary arteries (PCAs) were decellularized to prepare decellularized porcine coronary artery (DPCA), and bilayer hybrid scaffolds were prepared by coating gelatin and sodium alginate mixed hydrogel of seven different proportions and combined with mouse fibroblasts (L929 cells) to study the construction of tissue engineering vessels in vitro. The obtained bilayer hybrid scaffolds were 3-7 cm in length, 5 mm in external diameter, and 1 mm in average wall thickness. All seven bilayer hybrid scaffolds showed good biocompatibility after cell inoculation. Compared with 2D culture, cells on 3D scaffolds grew relatively slowly in the first 4 days, and the number of cells proliferated rapidly at 7 days. In the same culture days, different concentrations of hydrogel also had an impact on cell proliferation. With the increase of hydrogel content, cells on the 3D scaffold formed cell colonies faster. The results showed that the scaffold had good biocompatibility and could meet the needs of artificial blood vessel construction.

Degree of Soft Tissue Injury is a Major Determinant of Successful Arterial Repair in the Extremity: A New Classification of Extremity Arterial Injury?

BACKGROUND

This study aimed to investigate outcomes after extremity arterial injury repair and examined the association between outcomes and the degree of soft tissue injury and vascular repair methods.

METHODS

A retrospective study was conducted on 106 patients (108 cases) who underwent emergent microsurgical repair of extremity arterial injury due to trauma and non-perfusion of the affected extremity. The cases were divided into three groups by degree of associated soft tissue injuries: (A) adequate soft tissue coverage over the injured major vessels after radical debridement, (B) inadequate soft tissue coverage over the injured major vessels after radical debridement, and (C) radical debridement was not feasible due to unclear extent of injured soft tissue. Differences in vascular repair methods and outcomes among the three groups were analyzed.

RESULTS

In Group A (n = 61), microvascular suture and vessel graft achieved 95.1% and 85.0% successful limb reperfusion, respectively. In Group B (n = 31), vessel reconstruction with flap coverage achieved 100% successful reperfusion. Vessel graft achieved 28.6% successful limb reperfusion, while there were no cases of successful reperfusion using microvascular sutures. In Group C (n = 16), no vascular repair method achieved successful reperfusion. There were significant differences among the three groups in successful reperfusion (p < 0.001) and limb salvage (p < 0.001).

CONCLUSION

The extent of associated soft tissue injury was associated with different vascular repair methods and outcomes. We propose a new system for classifying these injuries according to the degree of associated soft tissue injury.

Stopping extremity hemorrhage: More than just a tourniquet

Major extremity hemorrhage is a surgical emergency, and the physical examination is essential to help dictate appropriate clinical decision making. Hard signs that require immediate surgical intervention include ongoing bleeding, expanding hematoma, ischemic limb, as well as partial/complete amputation. Packing, compression, balloon tamponade, and tourniquets are very helpful to temporize major hemorrhage. Mangled extremities are very challenging to manage and require a multidisciplinary approach. Temporary vascular shunts are excellent tools for vascular/orthopedic damage control and for temporary stabilization prior to transport for definitive care.

Traumatic proximal brachial artery injury selectively managed non-operatively: A case report and review of the literature

A right hand dominant 18-year-old female with a body mass index greater than forty presented to the trauma bay after sustaining two gunshot wounds to her right upper extremity. On physical exam, she had doppler signals and she reported neuropathy in the right median nerve distribution. She had no active signs of bleeding and she was subsequently taken to computed tomography which revealed an abrupt proximal brachial artery opacification with distal reconstitution in addition to having air tracking into the axillary and subclavian arteries. She underwent further resuscitation with normalization of perfusion as her radial and ulnar arteries became palpable. Traditionally, proximal brachial artery injuries are managed by an open surgical approach, which has a morbidity associated with the surgical dissection. Additionally in this case, there was concern for a blast injury near the potential graft inflow site. This case report highlights a patient who sustained a proximal brachial artery occlusion that was managed medically with antithrombotic agents and serial exams.

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The brachial artery lies alongside the median nerve.

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Anatomical nerve deficits may hint at the presence of vascular injuries.

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Elbow collaterals keep the distal arm perfused during brachial artery occlusion.

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Hard signs without bleeding/absence of perfusion can have a deliberate assessment.

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Injuries proximal vs. distal to the profunda branch typically have different injury patterns.

American Association for the Surgery of Trauma-World Society of Emergency Surgery guidelines on diagnosis and management of peripheral vascular injuries

The peripheral arteries and veins of the extremities are among the most commonly injured vessels in both civilian and military vascular trauma. Blunt causes are more frequent than penetrating except during military conflicts and in certain geographic areas. Physical examination and simple bedside investigations of pulse pressures are key in early identification of these injuries. In stable patients with equivocal physical examinations, computed tomography angiograms have become the mainstay of screening and diagnosis. Immediate open surgical repair remains the first-line therapy in most patients. However, advances in endovascular therapies and more widespread availability of this technology have resulted in an increase in the range of injuries and frequency of utilization of minimally invasive treatments for vascular injuries in stable patients. Prevention of and early detection and treatment of compartment syndrome remain essential in the recovery of patients with significant peripheral vascular injuries. The decision to perform amputation in patients with mangled extremities remains difficult with few clear indicators. The American Association for the Surgery of Trauma in conjunction with the World Society of Emergency Surgery seeks to summarize the literature to date and provide guidelines on the presentation, diagnosis, and treatment of peripheral vascular injuries. LEVEL OF EVIDENCE: Review study, level IV.

Yield of CT angiography in penetrating lower extremity trauma

PURPOSE

CT angiography (CTA) has become a valuable tool in the assessment of suspected arterial injury in patients with penetrating lower extremity trauma. However, expensive imaging such as CTA should be judiciously utilized to ensure value-based care. We therefore assessed the yield of CTA in this setting at a level-1 trauma unit and correlated it with the clinical history provided.

METHODS

A retrospective descriptive study from 1 July 2013 to 31 June 2018 at a 1386-bed, tertiary-level, public-sector teaching hospital in Cape Town, South Africa.. All patients undergoing CTA for suspected arterial injury following penetrating lower extremity trauma were included. The imaging yield of clinically significant arterial injury and the predictive value of specific clinical signs were determined.

RESULTS

A total of 983 patients (median age 27 years, 91% male) were included; 90% (886/983) had gunshots, 9% (89/983) stabs, and 1% (8/983) other injuries. Despite an average 13% year-on-year increase in CTA performed, there was no change in the proportion demonstrating arterial injury. Thirty-four percent (23/68) of patients with strong (hard) signs of arterial injury (active pulsatile bleeding, rapidly expanding hematoma, absent pulse, palpable thrill, or audible bruit), 11% (49/459) with moderate (soft) signs (history of an arterial bleed, excessive non-pulsatile bleeding, large non-expanding hematoma, major neurological deficit, diminished but appreciable pulse, and arterial proximity), and 5% (24/456) with no indication for imaging had clinically significant arterial injuries. Significant positive correlations were rapidly expanding hematoma (p = 0.009), an absent pulse (p < 0.001), and a diminished pulse (p < 0.001). Significant negative correlations were proximity to a major artery (p = 0.005) and no clinical indication provided (p < 0.001).

CONCLUSION

There is poor correlation between clinical details provided and the presence of arterial injury at our institution. In this context, CTA serves a pivotal role in the definitive identification of arterial injury.

Xenogeneic-free generation of vascular smooth muscle cells from human induced pluripotent stem cells for vascular tissue engineering

Development of mechanically advanced tissue-engineered vascular grafts (TEVGs) from human induced pluripotent stem cell (hiPSC)-derived vascular smooth muscle cells (hiPSC-VSMCs) offers an innovative approach to replace or bypass diseased blood vessels. To move current hiPSC-TEVGs toward clinical application, it is essential to obtain hiPSC-VSMC-derived tissues under xenogeneic-free conditions, meaning without the use of any animal-derived reagents. Many approaches in VSMC differentiation of hiPSCs have been reported, although a xenogeneic-free method for generating hiPSC-VSMCs suitable for vascular tissue engineering has yet to be established. Based on our previously established standard method of xenogeneic VSMC differentiation, we have replaced all animal-derived reagents with functional counterparts of human origin and successfully derived functional xenogeneic-free hiPSC-VSMCs (XF-hiPSC-VSMCs). Next, our group developed tissue rings via cellular self-assembly from XF-hiPSC-VSMCs, which exhibited comparable mechanical strength to those developed from xenogeneic hiPSC-VSMCs. Moreover, by seeding XF-hiPSC-VSMCs onto biodegradable polyglycolic acid (PGA) scaffolds, we generated engineered vascular tissues presenting effective collagen deposition which were suitable for implantation into an immunodeficient mice model. In conclusion, our xenogeneic-free conditions for generating hiPSC-VSMCs produce cells with the comparable capacity for vascular tissue engineering as standard xenogeneic protocols, thereby moving the hiPSC-TEVG technology one step closer to safe and efficacious clinical translation.

Hard signs gone soft: A critical evaluation of presenting signs of extremity vascular injury

BACKGROUND

Despite advances in management of extremity vascular injuries, "hard signs" remain the primary criterion to determine need for imaging and urgency of exploration. We propose that hard signs are outdated and that hemorrhagic and ischemic signs of vascular injury may be of greater clinical utility.

METHODS

Extremity arterial injuries from the American Association for the Surgery of Trauma PROspective Observational Vascular Injury Treatment registry were analyzed to examine the relationships between hard signs, ischemic signs, and hemorrhagic signs of extremity vascular injury with workup, diagnosis, and management.

RESULTS

Of 1,910 cases, 1,108 (58%) had hard signs of vascular injury. Computed tomography angiography (CTA) was more commonly used as the diagnostic modality in patients without hard signs, while operative exploration was primarily used for diagnosis in hard signs. Patients undergoing CTA were more likely to undergo endovascular or hybrid repair (EHR) (10.7%) compared with patients who underwent exploration for diagnosis (1.5%). Of 915 patients presenting with hemorrhagic signs, CTA was performed 14.5% of the time and was associated with a higher rate of EHR and observation. Of the 490 patients presenting with ischemic signs, CTA was performed 31.6% of the time and was associated with higher rates of EHR and observation. Hemorrhagic signs were associated with arterial transection, while ischemic signs were associated with arterial occlusion. Patients with ischemic signs undergoing exploration for diagnosis received more units of packed red blood cells during the first 24 hours. There was no difference in amputation rate, reintervention rate, hospital length of stay, or mortality in comparing groups who underwent CTA versus exploration.

CONCLUSION

Hard signs have limitations in identification and characterization of extremity arterial injuries. A strategy of using hemorrhagic and ischemic signs of vascular injury is of greater clinical utility. Further prospective study is needed to validate this proposed redefinition of categorization of presentations of extremity arterial injury.

LEVEL OF EVIDENCE

Diagnostic, level III.

Human iPS Cell-derived Tissue Engineered Vascular Graft: Recent Advances and Future Directions

Tissue engineered vascular grafts (TEVGs) generated from human primary cells represent a promising vascular interventional therapy. However, generation and application of these TEVGs may be significantly hindered by the limited accessibility, finite expandability, donor-donor functional variation and immune-incompatibility of primary seed cells from donors. Alternatively, human induced pluripotent stem cells (hiPSCs) offer an infinite source to obtain functional vascular cells in large quantity and comparable quality for TEVG construction. To date, TEVGs (hiPSC-TEVGs) with significant mechanical strength and implantability have been generated using hiPSC-derived seed cells. Despite being in its incipient stage, this emerging field of hiPSC-TEVG research has achieved significant progress and presented promising future potential. Meanwhile, a series of challenges pertaining hiPSC differentiation, vascular tissue engineering technologies and future production and application await to be addressed. Herein, we have composed this review to introduce progress in TEVG generation using hiPSCs, summarize the current major challenges, and encapsulate the future directions of research on hiPSC-based TEVGs. Graphical abstract.

Endovascular repair is a feasible option for superficial femoral artery injuries: a comparative effectiveness analysis

PURPOSE

To compare outcomes between open (OR) and endovascular repair following superficial femoral artery (SFA) injuries.

METHODS

This is a cross-sectional study querying the 2012-2014 National Inpatient Sample for SFA injuries. Patients were grouped into OR and stent-graft placement (SGP). Primary outcome was in-hospital mortality. Secondary outcomes included hospital length of stay (HLOS), fasciotomy and amputation rate, and cost. Wilcoxon rank-sum, Kruskal-Wallis, Chi-squared test with Bonferroni adjustment were used as appropriate; p < 0.05 was significant.

RESULTS

255 Patients were identified. Mean age was 34.6 years and majority were males. OR was performed in 82.7%. Overall mortality rate was 3.7%. Median HLOS was 8 days. Fasciotomies were performed in 31% and lower limb amputations in 3.7%. Males more often underwent OR (89.0% vs. 73.1%, p < 0.01). SGP patients were significantly older (44.9 vs. 32.5 years; p < 0.01), and with Medicare insurance (20.5% vs. 6.5%; p < 0.01. Mortality, HLOS, and hospitalization cost were not significantly different. OR patients had higher rate of fasciotomy (35.4% vs. 15.4%; p < 0.01).

CONCLUSIONS

Endovascular management is not inferior to OR following SFA injuries and both carry a low amputation rate. OR is associated with a higher fasciotomy rate. Endovascular repair should be considered when technically feasible.

Literature review of peripheral vascular trauma: Is the era of intervention coming?

Traumatic peripheral vascular injury is a significant cause of disability and death either in civilian environments or on the battlefield. Penetrating trauma and blunt trauma are the most common forms of vascular injuries. Besides, iatrogenic arterial injury (IAI) is another pattern of vascular trauma. The management of peripheral vascular injuries has been improved in different environments and wars. There are different types of vascular injuries, such as vasospasm, contusion, intimal flaps, intimal disruption or hematoma, external compression, laceration, transection and focal wall defects, etc. The main clinical manifestations of vascular injuries are shock following massive hemorrhage and limb necrosis due to tissue and organ ischemia. Ultrasound, computed tomography angiography (CTA) and magnetic resonance angiography (MRA) are most valuable for assessment of peripheral vascular injuries. Angiography remains the gold standard for diagnosing vascular trauma. Immediate hemorrhage control and rapid restoration of blood flow are the primary goals of vascular trauma treatment. There are many operative treatment methods for vascular injuries, such as vascular suture or ligation, vascular wall repair and vascular reconstruction with blood vessel prostheses or vascular grafts. Embolization, balloon dilation and covered stent implantation are the main endovascular techniques. Surgical operation is still the primary treatment for vascular injuries. Endovascular treatment is a promising alternative, proved to be safe and effective, and preferred selection for patients. In summary, rapid diagnosis and timely surgical intervention remain the mainstays of the treatment. However, many issues need to be resolved by further studies.

Ballistic Axillary Vein Transection: A Case Report

Patient: Male, 25-year-old

Final Diagnosis: Axillary vein transection

Symptoms: Shortness of breath

Medication: —

Clinical Procedure: Ligation of the axillary vein

Specialty: Surgery

Application of Human Induced Pluripotent Stem Cells in Generating Tissue-Engineered Blood Vessels as Vascular Grafts

In pace with the advancement of tissue engineering during recent decades, tissue-engineered blood vessels (TEBVs) have been generated using primary seed cells, and their impressive success in clinical trials have demonstrated the great potential of these TEBVs as implantable vascular grafts in human regenerative medicine. However, the production, therapeutic efficacy, and readiness in emergencies of current TEBVs could be hindered by the accessibility, expandability, and donor-donor variation of patient-specific primary seed cells. Alternatively, using human induced pluripotent stem cells (hiPSCs) to derive seed vascular cells for vascular tissue engineering could fundamentally address this current dilemma in TEBV production. As an emerging research field with a promising future, the generation of hiPSC-based TEBVs has been reported recently with significant progress. Simultaneously, to further promote hiPSC-based TEBVs into vascular grafts for clinical use, several challenges related to the safety, readiness, and structural integrity of vascular tissue need to be addressed. Herein, this review will focus on the evolution and role of hiPSCs in vascular tissue engineering technology and summarize the current progress, challenges, and future directions of research on hiPSC-based TEBVs.

Pattern of Extremity Arterial Injury and Outcome of Repair in Southwest, Nigeria

Background:

Extremity arterial injuries are an important cause of loss of life/limb after trauma. Early intervention is important for the good outcome.

Objectives:

The objective of this study is to review the pattern of presentation and study the factors that influences the outcome of extremity arterial injuries in our hospital.

Patients and Methods:

This is a retrospective study of all patients with injuries to the extremity arteries requiring surgical intervention from July 2007 to June 2015. Data obtained included biodata, ischemic time, arteries involved, surgical intervention, and outcomes and analyzed using SPSS version 22.

Setting:

Our hospital is the main referral hospital for vascular trauma serving four adjoining states in Nigeria and is linked to major cities by at least 3 Trunk-A federal roads.

Subjects:

The subjects are patients who were managed in our cardiovascular surgical unit for the study duration (July 2007–June 2015) who had extremity arterial injuries.

Results:

A total of 36 patients presenting with 40 arterial injuries in 37 limbs were studied. The mean age was 28.4 ± 10.3 years with male preponderance (88.9%). Gunshot injuries were the most common cause of arterial injuries (37.8%), followed by assault (27%). The mean time from injury to presentation for acute injuries was 20.4 h but 23 of the patients (63.8%) presented to the accident and emergency department within 12 h of injury. A limb salvage rate of 64.9% was achieved though ischemic times of ≥12 h were associated with poor outcomes.

Conclusion:

Prolonged ischemic time is associated with poor outcomes. Efforts should be put in place to reduce the limb ischemic times.

The golden year: How functional recovery sets the stage for tendon transfer surgery among patients with tetraplegia-a qualitative analysis

BACKGROUND

Tendon transfer surgery can effectively improve hand function for patients with tetraplegia but remains poorly utilized. Little is known regarding how patients' rehabilitation experiences influence their perception of function, identity, and coping to shape their reconstructive context.

METHODS

We performed a cross-sectional qualitative analysis of 19 participants with C4-C7 cervical spinal injuries: 9 patients had undergone reconstruction; 10 had not. Semistructured interviews were conducted using an interview guide focusing on rehabilitation experience, the relationship between function and identity, and how patient experience evolved. Interview transcripts were analyzed using grounded theory.

RESULTS

The study sample was predominantly male (79%), white (89%), and American Spinal Injury Association grades A-D (grade A: 42%; grade B: 32%; grade C: 16%; grade D: 10%). Recognizing rehabilitation's necessity, functional gains, and constructive patient-therapist relationships promoted engagement in therapy. Poor insurance coverage and financial constraints decreased rehabilitation access. Function affected identity through the degree to which it tied participants to a "patient" role. Early in recovery, patients' function, roles, and attitudes were fluid but solidified over time; how satisfied patients were with these final positions influenced how they coped.

CONCLUSION

The balance of patients' positive and negative coping has been found to influence patients' progression to surgery. This study describes how function and identity contribute to coping. Participants' function and identity evolved during a finite period we call "the golden year," before reaching a fixed point around which they built their lives. The norms patients establish during this time may affect receptiveness to surgery.

Evaluation, Surgical Management and Outcome of Traumatic Extremity Vascular Injuries: A 5-year Level-1 Trauma Centres Experience

Objective: We aim to share our experience regarding the surgical management and outcome of extremity vascular trauma in level-1 trauma centres in Pakistan.

Patients and methods: All consecutive patients with traumatic extremity vascular injury (TEVI) fulfilling the inclusion criteria; between June 2012 and June 2017 were included. The demographics, clinical presentation, management, and outcome measures were recorded.

Results: The study included 81 patients. The mean age±standard deviation was 28.6±14.5 years and 81.5% (n=66) of the patients were males. Blunt TEVI was found in 65.4% (n=53) of the cases. Partial laceration was the most common type of arterial injury (64.2%, n=52) and autologous interposition venous grafting was the most common repair performed (60.5%, n=49). Fasciotomy was performed in 67.9% (n=55) of the patients. The limb salvage rate was 82.7%. The amputation rate was higher in the blunt trauma group when compared with that of the penetrating trauma group. The length of the intensive care unit stay and the use of polytetrafluoroethylene as interposition graft were two independent predictors of limb loss. The mortality rate in this series was 8.6%.

Conclusion: Blunt TEVI is associated with higher morbidity and limb loss. The use of synthetic graft should be discouraged. The liberal use of autologous interposition venous graft and the judicious use of fasciotomies are helpful to achieve favorable outcomes.

For the patient-Evolution in the management of vascular trauma

There has been an evolution in the diagnosis and management of vascular trauma over the past 100 years. The primary stimulus to these changes has been the increased volume of patients with cervical, truncal, and peripheral vascular injuries during military conflicts and in civilian life. Patients with "hard" signs of a vascular injury are taken to surgery emergently with a few exceptions to be described. In contrast, patients with "soft" signs of a vascular injury undergo a careful physical examination including measurement of vascular index to determine if radiologic imaging is necessary. Computed tomography arteriography has become the most commonly used method of imaging, whereas duplex ultrasonography is used in some centers. Nonoperative management is now common for nonocclusive injuries diagnosed on computed tomography arteriography. Proximal tourniquets are commonly used to control exsanguinating hemorrhage from injuries to extremities, whereas balloons can be used to control hemorrhage from difficult to expose areas at operation. Temporary intraluminal shunts are now used in 3% to 9% of arterial injuries. Operative techniques of repair have been refined and contribute to the excellent results noted in modern trauma centers.

Pitfalls in the management of peripheral vascular injuries

Over the past 65+ years, most civilian peripheral vascular injuries have been managed by trauma surgeons with training or experience in vascular repair or ligation. This is appropriate as the in-hospital trauma team is immediately available, and there are often other injuries present in the victim.

The pitfall to avoid during evaluation of the patient in the emergency center is a missed diagnosis. In the patient without ‘hard’ signs of a peripheral vascular injury, a careful history (bleeding), physical examination including measurement of ankle–brachial (ABI) or brachial–brachial index and liberal use of CT arteriography depending on an ABI <0.9 should essentially make the diagnosis if an arterial injury is present.

At operation, one pitfall is to limit skin preparation and draping, thereby eliminating the option of removing the greater saphenous vein if needed as a conduit from either the groin or ankle of an uninjured lower extremity. Another pitfall is to make a full longitudinal incision directly over a large pulsatile hematoma. Rather, separate shorter longitudinal incisions should be made to obtain proximal and distal vascular control before entering the hematoma. The failure to recognize patients who should be managed initially with insertion of a temporary intraluminal shunt is a major pitfall as well. Not following time-proven and results-proven ‘fine techniques’ of operative repair is another major pitfall. Such techniques include the following: use of small angioaccess vascular clamps or silastic vessel loops; passage of proximal and distal Fogarty catheters; administration of regional or systemic heparin during complex repairs; an open anastomosis technique; and completion arteriography after a complex arterial repair in a lower extremity.

Avoiding pitfalls should allow for success in peripheral vascular repair, particularly since most patients are young with non-diseased vessels.

Accuracy of Physical Examination, Ankle-Brachial Index, and Ultrasonography in the Diagnosis of Arterial Injury in Patients With Penetrating Extremity Trauma: A Systematic Review and Meta-analysis

BACKGROUND

Penetrating Extremity Trauma (PET) may result in arterial injury, a rare but limb- and life-threatening surgical emergency. Timely, accurate diagnosis is essential for potential intervention in order to prevent significant morbidity.

OBJECTIVES

Using a systematic review/meta-analytic approach, we determined the utility of physical examination, Ankle-Brachial Index (ABI), and Ultrasonography (US) in the diagnosis of arterial injury in emergency department (ED) patients who have sustained PET. We applied a test-treatment threshold model to determine which evaluations may obviate CT Angiography (CTA).

METHODS

We searched PubMed, Embase, and Scopus from inception to November 2016 for studies of ED patients with PET. We included studies on adult and pediatric subjects. We defined the reference standard to include CTA, catheter angiography, or surgical exploration. When low-risk patients did not undergo the reference standard, trials must have specified that patients were observed for at least 24 hours. We used the Quality Assessment Tool for Diagnostic Accuracy Studies (QUADAS-2) to evaluate bias and applicability of the included studies. We calculated positive and negative likelihood ratios (LR+ and LR-) of physical examination ("hard signs" of vascular injury), US, and ABI. Using established CTA test characteristics (sensitivity = 96.2%, specificity = 99.2%) and applying the Pauker-Kassirer method, we developed a test-treatment threshold model (testing threshold = 0.14%, treatment threshold = 72.9%).

RESULTS

We included eight studies (n = 2,161, arterial injury prevalence = 15.5%). Studies had variable quality with most at high risk for partial and double verification bias. Some studies investigated multiple index tests: physical examination (hard signs) in three studies (n = 1,170), ABI in five studies (n = 1,040), and US in four studies (n = 173). Due to high heterogeneity (I²  > 75%) of the results, we could not calculate LR+ or LR- for hard signs or LR+ for ABI. The weighted prevalence of arterial injury for ABI was 14.3% and LR- was 0.59 (95% confidence interval [CI] = 0.48-0.71) resulting in a posttest probability of 9% for arterial injury. Ultrasonography had weighted prevalence of 18.9%, LR+ of 35.4 (95% CI = 8.3-151), and LR- of 0.24 (95% CI = 0.08-0.72); posttest probabilities for arterial injury were 89% and 5% after positive or negative US, respectively. The posttest probability of arterial injury with positive US (89%) exceeded the CTA treatment threshold (72.9%). The posttest probabilities of arterial injury with negative US (5%) and normal ABI (9%) exceeded the CTA testing threshold (0.14%). Normal examination (no hard or soft signs) with normal ABI in combination had LR- of 0.01 (95% CI = 0.0-0.10) resulting in an arterial injury posttest probability of 0%.

CONCLUSIONS

In PET patients, positive US may obviate CTA. In patients with a normal examination (no hard or soft signs) and a normal ABI, arterial injury can be ruled out. However, a normal ABI or negative US cannot independently exclude arterial injury. Due to high study heterogeneity, we cannot make recommendations when hard signs are present or absent or when ABI is abnormal. In these situations, one should use clinical judgment to determine the need for further observation, CTA or catheter angiography, or surgical exploration.

Vascular Shunts in Civilian Trauma

Experience with temporary intravascular shunts (TIVS) for vessel injury comes from the military sector and while the indications might be clear in geographically isolated and under resourced war zones, this may be an uncommon scenario in civilian trauma. Data supporting TIVS use in civilian trauma have been extrapolated from the military literature where it demonstrated improved life and limb salvage. Few non-comparative studies from the civilian literature have also revealed similar favorable outcomes. Still, TIVS placement in civilian vascular injuries is uncommon and by some debatable given the absence of clear indications for placement, the potential for TIVS-related complications, the widespread resources for immediate and definitive vascular repair, and the need for curtailing costs and optimizing resources. This article reviews the current evidence and the role of TIVS in contemporary civilian trauma management.

Vascular Injury in Orthopedic Trauma

Vascular injury in orthopedic trauma is challenging. The risk to life and limb can be high, and clinical signs initially can be subtle. Recognition and management should be a critical skill for every orthopedic surgeon. There are 5 types of vascular injury: intimal injury (flaps, disruptions, or subintimal/intramural hematomas), complete wall defects with pseudoaneurysms or hemorrhage, complete transections with hemorrhage or occlusion, arteriovenous fistulas, and spasm. Intimal defects and subintimal hematomas with possible secondary occlusion are most commonly associated with blunt trauma, whereas wall defects, complete transections, and arteriovenous fistulas usually occur with penetrating trauma. Spasm can occur after either blunt or penetrating trauma to an extremity and is more common in young patients. Clinical presentation of vascular injury may not be straightforward. Physical examination can be misleading or initially unimpressive; a normal pulse examination may be present in 5% to 15% of patients with vascular injury. Detection and treatment of vascular injuries should take place within the context of the overall resuscitation of the patient according to the established principles of the Advanced Trauma Life Support (ATLS) protocols. Advances in the field, made mostly during times of war, have made limb salvage the rule rather than the exception. Teamwork, familiarity with the often subtle signs of vascular injuries, a high index of suspicion, effective communication, appropriate use of imaging modalities, sound knowledge of relevant technique, and sequence of surgical repairs are among the essential factors that will lead to a successful outcome. This article provides a comprehensive literature review on a subject that generates significant controversy and confusion among clinicians involved in the care of trauma patients. [Orthopedics. 2016; 39(4):249-259.].

Retrospective analysis of case series of patients with vascular war injury treated in a district hospital

INTRODUCTION

As the Syrian civil war continues, medical care of the injured remains a priority for health facilities receiving casualties. Ziv Medical Centre, the closest hospital in Israel to the Syrian border, has received 500 casualties since February 2013. Seventeen of these patients had vascular injuries. This research reports the care of these seventeen patients and explores the challenges of treatment in patients with little antecedent clinical history and improvised initial care that may be complicated by delay to definitive care, sepsis and limb ischaemia.

METHOD

Electronic and paper patient records were examined. Descriptive case series data are presented.

RESULTS

Fifteen of the 17 patients were male. The mean age was 20 years (range 8-30 years). Causes of injury included gunshot wounds (4 patients), shrapnel (multi-fragment) injury (12 patients), and 1 patient was run over and dragged behind a car. The time from injury to transfer to definitive care ranged from 5h to 7 days (mean 43 h). All but one patient had associated non-vascular multiple-trauma. Thirteen patients presented with limb ischaemia. Four patients had arterio-venous fistula (AVF) or pseudoaneurysm. There were 5 upper and 10 lower limb major vascular injuries. Three patients had neck vessel injuries. All patients were investigated with CT angiography and underwent surgical or endovascular intervention. In 12 patients, 4 vessels were debrided and re-anastomosed and 13 vessels bypassed. Endovascular repair was performed in 4 patients. After initial revascularisation, 4 patients went on to amputation. There were no deaths.

CONCLUSIONS

The injuries treated are heterogeneous, and reflect the range of high energy vascular trauma expected in conflict. The broad range of vascular solutions required to optimise outcomes, in particular, limb salvage, in turn, reflect the challenges of dealing with such injuries, especially within the context of sepsis, ischaemia and delay. As war continues, there is a pressing need to address the needs of patients with high energy injuries in austere environments where there is a dearth of health resources and where definitive care may be days away.

Practical application of bedside diagnostics in determining limb viability

INTRODUCTION

This study aimed to determine the practical application of vascular lab studies in determining limb salvage outcomes in injured patients with concerning clinical examinations.

METHODS

A retrospective review of the trauma registry at a level I center was conducted from January 2009 to June 2013. All patients >16 years of age who sustained a lower limb arterial injury had a concerning clinical exam (mottled skin, decreased skin warmth, diminished pulses) and had vascular lab studies to determine management were included. Data-points included demographics, type and location of injury, procedure type, vascular lab study results, and limb outcome.

RESULTS

Over a five-year period, 11 trauma patients met inclusion criteria. Five of these patients had concerning clinical exams after revascularization, and six observed patients had a concerning clinical examination during the course of their hospitalization. All 11 patients had vascular lab studies that were within normal limits. As a result of normal vascular lab studies, none of these patients underwent further imaging or intervention. None of these patients underwent amputation.

CONCLUSION

Vascular lab studies may be utilized to determine the need for intervention and/or lower limb bypass sufficiency in patients with questionable clinical examinations post injury.