AUTHOR AND EDITOR INFORMATION

Section 1 of 11  

• Authors and Editors
• Introduction
• Clinical
• Differentials
• Workup
• Treatment
• Medication
• Follow-up
• Miscellaneous
• Acknowledgments
• References

INTRODUCTION

Section 2 of 11  

• Authors and Editors
• Introduction
• Clinical
• Differentials
• Workup
• Treatment
• Medication
• Follow-up
• Miscellaneous
• Acknowledgments
• References

Background

Peripheral vascular injuries may occur through multiple mechanisms. These injuries may be difficult to detect; however, they may also cause serious morbidity and on occasion be life-threatening. Therefore, having a rational approach to the diagnosis and treatment of such patients to prevent a potentially catastrophic outcome is important.

Pathophysiology

Penetrating trauma to the extremities may result in peripheral vascular injury. Stab and gunshot wounds can both result in partial or complete transection of vascular structures via direct contact. In addition, gunshot wounds may indirectly cause vascular trauma. As a consequence of the cavity left behind by a bullet, the tissue recoils back to fill the space, and this motion may cause injury to adjacent vascular structures. The amount of indirect damage done relies on the velocity and mass of the bullet.

Blunt forces may also result in vascular injury. This may occur via shearing forces transmitted to the vessel or direct crushing of the vessel. These injuries may be associated with obvious mechanisms, such as motor vehicle accidents or severe crush injuries, but they should also be suspected in cases of bites from large dogs, electrical injuries, and other instances where large amounts of force may be applied to the tissue surrounding a vascular structure.

Searching for neurologic damage as well as fractures is important in patients with peripheral vascular injuries. Peripheral nerves are usually closely associated with vascular structures in the limbs, and the large forces often involved in vascular injuries may result in fractures.

Frequency

United States

Peripheral vascular injuries comprise approximately 3% of major injuries. Most are caused by penetrating trauma, but blunt trauma and iatrogenic injuries are also important mechanisms.

Mortality/Morbidity

• Mortality directly relates to other injuries (injury severity score) and to the degree of hemorrhage.
• • Isolated peripheral vascular trauma usually has a low mortality rate.
  • Morbidity increases with prolonged ischemia, which can result in amputation of the affected limb.
  • Morbidity associated with arterial reconstruction includes postrepair edema, infection, arterial compression, and anastomotic thrombosis.
  • Neurologic deficits from peripheral nerve damage may occur.

Sex

Penetrating peripheral vascular injuries secondary to gunshots or stab wounds are more common in males than in females.

Age

Traumatic injury disproportionately affects younger persons and is the leading cause of death in those aged 1-44 years.

CLINICAL

Section 3 of 11  

• Authors and Editors
• Introduction
• Clinical
• Differentials
• Workup
• Treatment
• Medication
• Follow-up
• Miscellaneous
• Acknowledgments
• References

History

• Tetanus status 
  
  
• Timing of wound
  
  
• History of abuse or danger to patient if discharged
  
  
• Paresthesia or loss of function in a limb
  
  
• Information regarding the number of gunshots heard may be helpful. 
  
  
• Knowing the type of weapon used and the velocity or potential path of the missile may help in assessment.  
  
  
• In blunt vascular injury, a detailed mechanism of injury often helps in appreciating subtle injuries.

Physical

Always assess ABCs first. During the primary survey, any extremity hemorrhage should be addressed. The patient can then be examined for potential vascular injury. A thorough examination of all injured extremities should be performed. Particular attention should be paid to assessing pulses, capillary refill, deformities, and neurologic function. Two-point discrimination and strength testing should be included in the neurologic examination. 

Below are clusters of physical examination findings and historical features that aid in the diagnostic and therapeutic approach to patients in whom vascular injury is considered.

• Hard signs of vascular injury
  
  
  • Expanding hematoma
  • Palpable thrill or audible bruit
  • Pulsatile hemorrhage
  • Pain on passive extension of muscle compartment
  • Pallor
  • Paresthesias
  • Pulselessness (palpable pulse does not exclude diagnosis)
  • Prolonged capillary refill
  • Paralysis
• Soft signs of vascular injury
  
  
  • Large hematoma
  • Isolated peripheral nerve deficit
  • Delayed capillary refill

• High-risk injuries
  
  
  • Proximity injuries (within 1 cm of vascular bundles, ie, common femoral, axillary, brachial, and popliteal)
  • Associated fractures or dislocations
  • Bites from large dogs or other animals 
  • Crush injuries 
  • Shotgun injuries

Causes

Most injuries are secondary to acts of violence involving gunshot or stab wounds. Vascular injuries usually are caused by penetrating trauma from knives, bullets, and glass. Motor vehicle accidents, heavy machinery-related injuries, and falls cause a small proportion of blunt vascular injuries secondary to decelerating or crushing forces.

Penetrating injuries cause damage to vascular structures by direct injury (eg, secondary to stab or low-velocity missile wounds) and/or high-velocity injury (eg, cavitation effect by passage of a high-velocity missile through tissue with transfer of large amounts of kinetic energy). Destructive power increases proportionately with missile velocity and mass. These types of injuries can cause severe damage, even in the absence of direct vascular trauma.

DIFFERENTIALS

Section 4 of 11  

• Authors and Editors
• Introduction
• Clinical
• Differentials
• Workup
• Treatment
• Medication
• Follow-up
• Miscellaneous
• Acknowledgments
• References

WORKUP

Section 5 of 11  

• Authors and Editors
• Introduction
• Clinical
• Differentials
• Workup
• Treatment
• Medication
• Follow-up
• Miscellaneous
• Acknowledgments
• References

Lab Studies

• Laboratory studies do not help diagnose injury but may assist with management. Obtain the following studies in patients with vascular trauma:
  
  
  • Serial hemoglobin measurements
  • Typing and crossmatching of blood
  • BUN and creatinine levels as a measure of baseline renal function in anticipation of a contrast study
  • Baseline measurement of coagulation profile, especially if any associated medical conditions may affect coagulation (eg, alcoholism)
  • Serum lactate or base deficit measurement to assess degree of global ischemia

Imaging Studies

• Plain radiography  
  
  
  • Radiographs help diagnose fractures, foreign bodies, or missiles that may be responsible for neurovascular compromise.
  • Certain fractures more commonly are associated with blunt vascular injury.
    
    
    • Humerus and femur supracondylar or neck and shaft fractures
    
    
    • Medial clavicle
    • First rib and scapular fractures
  • Certain dislocations more commonly are associated with blunt vascular injury.
    
    
    • Elbow 
    
    
    • Knee 
    
    
    • Shoulder
    • Sternoclavicular
    • Scapulothoracic
• Angiography: For patients with high-risk injuries (especially proximity injuries) but no obvious ischemia on physical examination (no hard signs), further testing may be indicated. Indications for angiography or an equivalent test are listed below.
  
  
  • Angiography is highly accurate in detecting arterial injuries.
  • Patients with soft signs (especially pulse deficit) should have other testing performed (angiography, CT angiography [CTA], or ultrasonography). 
  • Patients with no hard or soft signs and an ankle brachial index (ABI) ³0.90 should not undergo angiography and may be admitted for observation.
  • Patients with a normal vascular examination and an ABI <0.90 should have angiography or an equivalent test performed.
  • Angiography is indicated only in the stable patient.
  • Any patient with obvious vascular injury (hard signs) mandates immediate surgical exploration with or without intraoperative angiography.
  • Use of angiography for proximity with normal examination findings usually is unnecessary. A normal physical examination evaluating the neurovascular status of the extremity is usually sufficient to warrant observation over angiography. Multiple studies demonstrate a very low likelihood of significant vascular injuries if distal pulses are intact and the ABI is ³0.90. However, strongly consider angiography in patients with a high-velocity gunshot wound or severe blunt trauma. This should be a decision made together with the consulting surgical service.

Other Tests

• Ankle brachial index  
  
  
  • ABI is an excellent screening test when used in conjunction with physical examination for peripheral pulses.
  • Perform ABI by placing a blood pressure (BP) cuff distal to the injury on the affected limb, and record the BP at which the pulse becomes detectable by Doppler ultrasonography. Then, in the unaffected arm, record the brachial BP at which the pulse is detected by Doppler ultrasonography. The ABI = ankle/wrist Doppler systolic pressure in the affected limb/brachial Doppler systolic pressure in the unaffected limb.
• CT angiography
  
  
  • Multiple retrospective and two prospective studies indicate that CTA with helical or multidetector CT scan is highly accurate, with sensitivity and specificity in the high 90s. A decision to use CTA as a screening test should be made with the radiology department at the institution.^{1, 2, 3, 4} 
  • Advantage - Noninvasive
  • Disadvantage - Requires intravenous contrast 
  • Disadvantage - Requires radiologist capable of reading CTA
• Color-flow duplex ultrasonography
  
  
  • Two prospective studies evaluating ultrasonography in the diagnosis of peripheral vascular trauma have been completed.^{5, 6}
    
    
  • Sensitivity, 95%; specificity, 99%; with an accuracy of 98% for predicting vascular injury
    
    
  • Images the vessel and measures blood flow and velocity 
    
    
  • Noninvasive alternative to arteriography in monitoring occult injuries  
    
    
  • Disadvantage - Requires skilled technician  
    
    
  • Advantage - Noninvasive and can be performed serially at bedside  
    
    
  • Ideal first screening test if capable technician is available  
• Digital subtraction angiography  
  
  
  • More sensitive than arteriography in detecting extravasation of contrast material  
    
    
  • Sensitive to motion artifact  
• Emergency center arteriography  
  
  
  • Involves manual contrast injection followed by immediate radiography
  • Rapid, accurate, and does not require transportation of an unstable patient to angiography suite
  • Currently used in young children, as formal angiography is difficult to obtain in an uncooperative patient

Procedures

• Splint fractures and reduce dislocations.  
• Unstable patients may require central venous access.
• Doppler limb pressure measurements, documenting decreased pulse pressure in the affected limb, help establish a diagnosis of vascular injury.

TREATMENT

Section 6 of 11  

• Authors and Editors
• Introduction
• Clinical
• Differentials
• Workup
• Treatment
• Medication
• Follow-up
• Miscellaneous
• Acknowledgments
• References

Prehospital Care

• Secure airway as needed.  
• Fluid resuscitation requires vascular access.
• Control hemorrhage by external compression.
• Splint extremity as needed.

Emergency Department Care

• As with all traumas, maintain ABCs as the first priority.
• If intravenous access is required, place a large-bore intravenous line in the unaffected limb or place a central line as needed. 
• Conduct a more detailed secondary evaluation to assess for vascular injury. Include a thorough neurovascular examination, as described in Physical, looking for hard and soft signs of vascular injury.
• Look for historical or physical findings that indicate a high risk of vascular injury. Proximity wound, bite from a large animal, high-velocity bullet or shotgun wound, severely crushed limb, associated dislocation (especially posterior knee dislocation), and others.
• Obvious vascular injury with evidence of ischemia indicates emergent surgical exploration once the patient is stabilized.
• Frequently assess vascular status.
  
  
  • Doppler examination for pulses helps in patients with diminished pulses.
  • Measure blood pressure in an injured and uninjured extremity. A 10 mm Hg difference suggests vascular injury, as does an ABI less than 1.0.
• Control hemorrhage with direct pressure. Do not blindly attempt to clamp a vessel because the potential for damaging accompanying peripheral nerves is high.
• Generally, extremity tissues tolerate 4-6 hours of ischemia. Carefully monitor popliteal artery injuries because of minimal collateral circulation present in the lower extremity. After 6-8 hours of ischemia, permanent disability of the limb and/or amputation will occur.
• Anatomic repositioning and splinting may help restore circulation in dislocations or fractures.
• Monitor the patient closely for development of compartment syndrome.
• Wounds should be irrigated extensively with normal saline.
• No clear consensus exists regarding use of antibiotics; however, a first-generation cephalosporin is usually adequate for an uncomplicated injury. If injury is caused by an animal bite or an open fracture is present, treat accordingly.

Consultations

Prompt consultation with the trauma team is routine at most major urban trauma centers. If isolated peripheral vascular injury is present, consult the vascular surgeon as soon as the patient stabilizes to reduce ischemia time.

MEDICATION

Section 7 of 11  

• Authors and Editors
• Introduction
• Clinical
• Differentials
• Workup
• Treatment
• Medication
• Follow-up
• Miscellaneous
• Acknowledgments
• References

The goal of therapy is to control pain and infections.

Drug Category: Analgesics

Pain control is essential to quality patient care. It ensures patient comfort, promotes pulmonary toilet, and aids physical therapy regimens. Most analgesics have sedating properties that benefit patients with traumatic injuries.

Use of pain medications in trauma victims is a difficult issue. Narcotics have several drawbacks, including exacerbating hypotension in hemorrhaging patients and mental status changes in patients with head injuries. These agents also may mask pain caused by subtle injuries. Nevertheless, in cases of isolated extremity trauma in stable patients, use pain medications. Use IV administration for more precise titration.

Drug Category: Antibiotics

Antibiotics should be used in all high-risk wounds. These include contaminated and devitalized wounds; patients with diabetes, HIV, or other immunocompromising disorder; and wounds caused by animal or human bites.  Patients with underlying fractures should be treated with antibiotics in a similar fashion as anyone with an open fracture.

Drug Category: Tetanus immunization

Tetanus immunization is indicated when 10 years have passed since last booster shot. If immunization status is unclear, tetanus immune globulin is required.

FOLLOW-UP

Section 8 of 11  

• Authors and Editors
• Introduction
• Clinical
• Differentials
• Workup
• Treatment
• Medication
• Follow-up
• Miscellaneous
• Acknowledgments
• References

Further Inpatient Care

• Most patients require surgical consultation and admission.

Further Outpatient Care

• Patients should have close follow-up because many injuries can be successfully treated if detected early.

Transfer

• If angiography or surgical consultation is not available at the primary institution, transfer the patient as quickly as possible after stabilization.

Complications

• Associated nerve damage occurs in a large percentage of vascular injuries, which may result in permanent deficits.
• Compartment syndrome
• Venous thrombosis
• Arterial embolization
• Wound infection
• Loss of limb may occur. Restoring blood flow to ischemic tissue within 6 hours is crucial or irreversible damage will occur.
• Ischemic contracture of affected limb 

Prognosis

• Blunt vascular injuries have a worse prognosis than those caused by penetrating trauma.
• The probability of limb loss is higher with blunt injury, greater extent of soft tissue injury (muscle, skin, and major nerves), greater number of associated long bone fractures, pulseless extremity, and need for arterial repair. 
• Injury severity score correlates with mortality rate.
• Intraoperative hypotension, arterial intimal injury, bony fracture, and thoracic injury are all predictors of higher postoperative complications.  
• Amputation rates are now very low. In addition, many patients with vascular injuries experience minimal disability. 

MISCELLANEOUS

Section 9 of 11  

• Authors and Editors
• Introduction
• Clinical
• Differentials
• Workup
• Treatment
• Medication
• Follow-up
• Miscellaneous
• Acknowledgments
• References

Medical/Legal Pitfalls

• Failure to promptly diagnose peripheral vascular injury is a pitfall. The legal implications of delayed diagnosis resulting in limb amputation are self-explanatory; however, amputation sometimes is necessary in severe injury. In such instances, do not delay amputation, as this results in increased risk of sepsis and higher morbidity.  
• Failure to provide a thorough physical examination, prompt consultation, early intravenous antibiotics, and tetanus immunization if indicated also are pitfalls. The goals are stabilization of the patient and minimization of ischemic time.

Special Concerns

• Pediatrics
• • A thorough neurovascular examination is more difficult in young children.
  • Children have a higher risk of developmental abnormalities secondary to ischemia.
  • Emergency center arteriography may be an alternative to aid rapid diagnosis in young patients.
• Geriatrics
  
  
  • Older patients have a higher mortality rate secondary to comorbid conditions.
  • Aggressive resuscitation is needed prior to operative interventions.

ACKNOWLEDGMENTS

Section 10 of 11  

• Authors and Editors
• Introduction
• Clinical
• Differentials
• Workup
• Treatment
• Medication
• Follow-up
• Miscellaneous
• Acknowledgments
• References

The authors and editors of eMedicine gratefully acknowledge the contributions of previous authors, A Antoine Kazzi, MD, Anupama Singh, MD, and Mazen El-Sayed, MD, to the development and writing of this article.

REFERENCES

Section 11 of 11

• Authors and Editors
• Introduction
• Clinical
• Differentials
• Workup
• Treatment
• Medication
• Follow-up
• Miscellaneous
• Acknowledgments
• References

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Article Last Updated: Jul 11, 2007