Vascular injury

# Overview
- Hard signs of vascular injury: expanding hematoma, bruit, thrill, active bleeding, severely ischemic extremity.
- Soft signs of vascular injury: proximity of wound to major vessels, hx of hemorrhage/shock, non-expanding hematoma, diminished pulse and anatomically related nerve injury.
- Prep contralateral saphenous vein in field, direct pressure (DP) to control bleeding (tourniquet only if DP fails).
- Duplex scan when available.
- Observe for evidence of compartment syndrome, change in vascular status. Ensure at least one follow-up vascular examination is performed.
- Injured extremity to non-injured extremity systolic Doppler pressure ratio:
- With the patient supine (for at least 10 minutes prior), take blood pressures (B/P) in both arms. Use the higher systolic pressure as the brachial pressure in the ratio.
- Place the B/P cuff on the patients leg just above the maleoli, and the Doppler probe at 45 degrees to the dorsal pedis or posterior tibial artery.
- Inflate the cuff until the Doppler signal stops. Slowly deflate the cuff until the signal returns and record the numbers as the ankle systolic pressure.
- To get the ABI ratio, divide the highest ankle pressure by the highest brachial pressure. For example, with systolic brachial pressures of 120 and 129 and an ankle systolic of 65, the ABI is 0.5. Perform on both right and left extremities. Farther from the heart, leg pressure is supposed to be higher than or at least equal to arm pressure. Interpret your ABI results based on these guidelines:
- 0.9: Normal
- 0.5 to 0.9: Claudication mild to moderate
- < 0.5: Resting ischemic pain, claudication
- < 0.2: Gangrenous extremity; suggests near total occlusion

# Basic Principles
- It is important to know the patients total trauma burden and physiology when deciding how to manage their vascular injury
- Surgeons should become familiar with the key anatomical landmarks for several vascular exposures so they can be performed rapidly in the injured patient
- Vascular trauma is the art of dealing with healthy arteries it is similar but different than dealing with vascular disease in the elderly
- Get proximal control outside of the hematoma / one level above the injury
- Once controlled, define the full extent of the vascular injury
- Gradually develop and optimize your work space so your hands are free to work
- Decide between complex vascular repair and damage control
- The safest place when dissecting out arteries is in the periadvential plane immediately next to the artery.
- When performing vascular trauma systemic anticoagulation is not always possible if the patient has multisystem injuries, in these cases consider local heparinized saline infusion (10 units heparin in 1000 cc of normal saline), proximally and distally
- Clear the inflow and outflow tracts before performing vascular repair or shunt insertion, using an appropriately sized Fogarty balloon embolectomy catheter, generally #5 for large arteries and #3 for small ones
- Do not pass embolectomy catheters too much, you will be rewarded with intense vasospasm and worse outcomes
- Healthy traumatized arteries often exhibit intense vasospasm when manipulated, this may effect post repair perfusion and can be relieved using local inta-arterial papaverine and nitroglycerin as the patients overall condition allows.
- Completion arteriography is not always possible but some form of assessment is required, such as improvement in pulse or doppler examination without this be suspect
- Ligation is not an admission of defeat
- Transected artery = interposition graft
- Vein repair is a luxury not a must
- Use an intraluminal balloon for problematic distal control
- Bleeding and ischemia are different priorities
- Balloon tamponade controls external bleeding in transition zones
- Intra-arterial shunts are good damage control options in unstable patients, this can be accomplished using Rummel tourniquets and either internal shunts (Argyle) or external shunts (Javid)
- External shunts that are placed entirely in the artery usually thrombose
- Sometimes despite you doing everything right to improve perfusion to the extremity (including fasciotomies) the arm / leg still dies

# Neck Vasculature Injuries
- General Principles
- If possible try to get a baseline neurologic exam in your patient, this is one of the best predictors in the outcome of carotid trauma
- Zone III (cephalad to the hyoid bone)
- arteriography or CT angio will help to define if there is a significant vascular injury
- Zone II (between the hyoid bone and the sternal notch)
- Injuries to this zone should be explored
- Standard neck incision is made from the mastoid to the sternal notch on the anterior border of the sternocleidomastoid muscle
- Identify the facial vein, and divide it this marks the bifurcation of the carotid artery, retract the internal jugular posteriorly using a self retaining retractor
- After fixing vascular injuries in this zone, have high index of suspicion and assess for esophageal and tracheal injuries
- Internal Jugular Vein
- Injuries to the internal jugular vein can be repaired with lateral venorraphy or ligated.
- Common Carotid artery
- Obtain proximal control outside of the hematoma at the base of the neck using a Rummel tourniquet on the CCA being careful not to ensnare the vagus nerve
- If possible obtain distal CCA control proximal to the CCA bifurcation, with this technique no shunt is needed
- Repair injury using lateral arterrioraphy, patch angioplasty, end to end anastomosis or bypass
- If patient is in extremis the CCA may be ligated with a low incidence of stroke due to the perfusion of the ICA from the intact ECA
- External Carotid artery
- Injuries to the ECA may be repaired using standard techniques or ligated since this is usually well tolerated
- Internal carotid artery
- Injuries to the ICA should be repaired if at all possible, while ligation is possible the incidence of stroke is considerable
- If there is poor inflow from the injured carotid, carefully pass a #3 Fogarty balloon embolectomy catheter no more than 2-3cm past the bifurcation to retrieve any thrombus
- If there is still no inflow from the ICA, ligation may be your best answer (this is a controversial point)
- ICA injuries with segmental loss may be repaired using RGSV interposition graft or ECA transposition
- If the injury is to the high internal carotid artery exposure is facilitated by nasotracheal intubation, division of the omohyoid muscle, the descendans hypoglossal nerve or mandibular subluxation.
- In the case of a distal carotid injury that is too high for reconstruction then ligation is appropriate
- In the case of a distal ICA lesion that you cannot get distal control on at all, then insert a # 3 Fogarty embolectomy catheter into the distal end of the ICA, place 2 clips just below the balloon to keep it expanded and cut the short to leave the balloon in the ICA to tamponade it.
- Vertebral Artery
- Use bone wax to plug a hosing vertebral artery from the vertebral canal
- Zone I
- Obtain arteriogram or CT angio to assess for vascular injury
- See below for approach to repair intrathoracic CCA injury

# Supra-Aortic Trunk Vascular Injuries
- General Principles
- Dissection in a mediastinal hematomas can be disorienting
- Often useful to open pericardium and trace vessels upward
- Divide the left Innominate vein to find the Innominate artery and continue north
- Be careful not to injure the right vagus nerve as it runs in front of the right subclavian artery
- When dissecting the left carotid artery in this plane BE CAREFUL not to injure the left vagus nerve as it descends in front of the aortic arch and gives off the left recurrent laryngeal nerve
- Do not plunge into a stable mediastinal hematoma for blunt trauma; this is often an avulsion of the Innominate artery
- The best management method for injuries to thoracic outlet arteries is usually bypass using a synthetic conduit such as Dacron
- Ligation of supra-aortic trunk arteries can be performed but may come at the cost of stroke
- Left subclavian artery
- Gain proximal control through a high left anterolateral thoracotomy in the 3rd intercostal space (above the nipple)
- Once proximal control obtained expose the injured subclavian through a supraclavicular incision for repair (avoid injury to phrenic nerve and thoracic duct if possible)
- Right subclavian artery
- Gain proximal control through median sternotomy
- Repair through right supraclavicular incision
- Subclavian veins
- May ligate if needed however, expect arm swelling, consider elevation and rarely fasciotomy
- May repair using standard techniques primary, lateral venorraphy, interposition graft
- Use infraclavicular incision for exposure
- Innominate artery
- Repair or bypass through median sternotomy
- Innominate Veins
- May ligate if needed however, expect arm swelling, consider elevation and rarely fasciotomy
- Ligation and division of left Innominate vein useful to expose arch vessel injuries
- May repair using standard techniques primary, lateral venorraphy, interposition graft
- Ligate or repair through median sternotomy, emergent bypass probably not necessary unless both veins injured
- If both Innominate veins injured may experience severe SVC syndrome with facial and upper airway edema
- Left common carotid artery
- Repair or bypass through median sternotomy
- Azygous Vein
- Often difficult to recognize
- Usually encountered when using exploratory right thoracotomy for hemothorax
- When recognized clamp, ligate or suture ligate
- Look for associated espophageal or bronchial injuries

# Upper Extremity Vascular Injuries
- Axillary Artery
- Exposed through infraclavicular incision midclavical to deltopectoral groove through clavipectoral fascia
- Options include shunt, ligation and fasciotomies, repair or bypass
- Axillary Vein
- May ligate if needed however, expect arm swelling, consider elevation and rarely fasciotomy
- May repair using standard techniques primary, lateral venorraphy, interposition graft
- Brachial artery
- The most frequently injured artery in the body
- Gain access by cutting down on medial aspect of upper arm between biceps and triceps; may extend proximally or distally as needed
- Avoid injury to basilic vein and median nerve
- S incision if need to cross antecubital fossa
- If injury below Profunda brachii pt may tolerate ligation
- Other options include lateral repair, patch angioplasty, end to end anastomosis or interposition graft
- Ensure good muscle coverage of artery or vascular repair
- Radial/ Ulnar artery
- First assess doppler flow in hand if ulnar intact with Doppler flow simple ligation probably best and most expedient
- Ligation, lateral suture, patch, EEA or interposition graft all possible

# Abdominal Vascular Injuries
Explore all retroperitoneal hematomas and perinephric ones selectively
- Aorta
- Try to get away with lateral repair in suprarenal aortic injuries
- Clamping the aorta at this level for extended period of time during repair will be rewarded with visceral ischemia and coagulopathy
- Beware of iatrogenic vein injury in an inframesocolic hematoma
- For infrarenal aortic injuries attempt lateral repair if possible, if not interposition tube graft may be better option than patch angioplasty
- Inferior Vena Cava
- Juxtarenal IVC
- Associated with a hematoma above the duodenal loop
- If not expanding do not explore
- Expose through Kocher or Catell-Braasch maneuver
- Insert Deaver over inferior surface of liver and tow in to give exposure and compress suprarenal IVC
- Mobilize the right kidney and divide the left renal vein to improve exposure to this portion of the cava
- Do your best to perform lateral repair of suprarenal IVC
- Bail outs include packing or ligation
- Infrarenal IVC
- Is associated with central hematoma that is inframesocolic
- Expose through Catell-Braasch maneuver
- When unroofing this hematoma prepare for big trouble by getting anesthesia ready for blood loss
- Unroof the hematoma and compress the IVC against the spinal column, quickly position your assistants hands to replace yours so you can prepare to repair the caval injury
- Be cautious applying clamps to the IVC, this may cause additional tearing
- If the patient crashes while attempting to control the injury, compress the adjacent aorta as well
- Define the edges of the cava to facilitate lateral repair
- Best not to attempt fancy repairs of the IVC in unstable patient; if lateral repair doesnt work ligate the IVC
- Iliac
- Walk the clamps to gradually converge on an iliac artery injury
- Shunt iliac artery injury and take patient to ICU for resuscitation if patient too unstable to repair, and return later to fix
- If unable to shunt and patient very unstable ligate iliac artery and return later for femoral  femoral bypass
- Dont chase a bleeder into the psoas muscle, these may result from ascending lumbar artery or vein which will be difficult to control if unroofed and respond well to simple packing
- In a patient with blunt trauma and a pelvic fracture, unless you specifically suspect a vascular injury in a patient with a pelvic hematoma, do not explore
- You may need to transect the overlying right common iliac artery to expose and control an injury to the confluence of the common iliac veins
- In patients with iliac vein injuries do not attempt fancy repairs, either they respond to lateral suture or they should be ligated

# Peri-Hepatic Vascular Injuries
- When dealing with hepatic trauma Pringle maneuvers can be used for 30-45 minutes
- If not expanding do not explore
- In retrohepatic venous injuries restore containment, dont be a hero
- Hepatic artery ligation may be useful in liver trauma if packing doesnt work
- The supraduodenal portal vein may be ligated for damage control
- When both portal vein and hepatic artery are damaged you must repair one of them

# Mesenteric Vascular Injuries
- When dealing with mesenteric vascular injuries a second look operation is advisable
- Blind clamping at the root of the mesentery is a recipe for disaster
- Beware of iatrogenic renal vein injury when exploring an inframesocolic hematoma
- Celiac artery
- Injury to the celiac access is rare but deadly
- The celiac access is difficult to expose, one technique is to try a gross hemostatic stitch with a heavy suture on a big needle (0 Proline) into the lesser omentum
- You may need to divide the stomach using a stapler to do get rapid exposure
- Superior mesenteric artery
- Injuries to the proximal SMA above the pancreas are essentially aortic injuries, best exposed by Mattox maneuver
- Exposure through the lesser sac is another option
- Usually are associated with pancreatic and/or gastric injuries
- May be best to ligate and do retrograde reconstruction
- Control of the retropancreatic SMA is best achieved by dividing the pancreas
- May insert shunt in SMA as damage control maneuver
- Reconstruct the SMA away from the injured pancreas if possible
- Reconstruct SMA using 6 mm ringed PTFE from distal aorta of right common iliac artery
- Superior mesenteric vein
- You may need to divide the pancreas to repair injuries to the SMV
- Repair the injured SMV if you can otherwise ligate it
- The consequences of portal or SMV ligation is massive fluid sequestration which translates into high post op fluid requirements and inability to close abdomen

# Renal Vascular Injuries
- Stable non expanding perinephric hematomas may not need to be explored
- Use judgment before embarking on repair of renal vascular injuries
- Dont kill the patient attempting to salvage a damaged kidney
- Try to assess the contralateral kidney when contemplating nephrectomy
- Obtain proximal renovascular control before exploring expanding perinephric hematomas
- On the right renovascular hilar injuries are often associated with injuries to the surgical soul (IVC, pancreas, porta hepatis)
- Right renovascular injuries are best exposed using a Cattell-Braasch maneuver
- Injuries to the right renal vein is essentially a side hole in the IVC, and therefore saving life is more important than saving kidney
- On the left dont hesitate to ligate the renal vein
- The Mattox maneuver gives you great visualization of the left kidney
- When performing revascularization of the kidney using bypass, perfuse the kidney intermittently using cold heparinized saline

# Peripheral Vascular Injuries
- General principles
- Align bone before arterial reconstruction
- The majority of injuries in patients with penetrating trauma can be explored directly with no need for preoperative arteriography
- In patients with diffuse extremity injuries associated with vascular compromise however, arteriography is often useful if the patient is stable
- It is imperative to insure that vascular repairs are covered with healthy muscle and not left exposed or bathed in devitalized infected tissue, exposed grafts will blow out
- Be liberal with fasciotomies especially in patients with popliteal artery repairs
- Femoral artery
- Control obtained either through standard femoral cutdown or through oblique transplant incision above inguinal ligament
- Superficial femoral artery
- Repair or bypass all SFA injuries in the young, acute occlusion in these patients is not well tolerated
- Profunda femoral artery
- Repair proximal injuries or bypass, distal PFA injuries can be ligated
- Femoral veins
- The majority of venous injuries can be ligated, especially if the patient is in extremis
- If you perform venous ligation be sure to perform liberal fasciotomy and be prepared for extremity fluid sequestration, and bleeding from venous hypertension in soft tissue wounds
- If the patient is stable however venous repair may help the patient avoid acute compartment syndromes or long term sequelae, especially for venous injuries above the confluence of the SFV and greater saphenous vein
- Popliteal Artery
- Above knee
- Best exposed through Hunters canal incision, retract Sartorius muscle down and look under the Vastus medialis muscle
- Use local heparin saline flush solution in prior to arterial repair
- Lateral arterioraphy may be used but end to end arterial anastomosis may be possible in young patients with normal healthy arteries,
- In blast injuries be sure to debride an adequate amount of devitalized artery, dont cheat or you may be rewarded with a thrombosed repair
- If significant arterial loss use reverse greater saphenous vein interposition graft with vein harvested from contralateral extremity
- Behind knee
- Best exposed through medial approach, divide tendinous muscular attachments
- Avoid injury to the greater saphenous vein and superficial peroneal nerve during exposure
- Use deep space retractors to aid with visualization
- Popliteal vein
- If possible repair, this will lead to less lower extremity venous hypertension and bleeding from any soft tissue defects.
- Often paired and can be ligated without too many sequelae
- Tibial arteries
- First, assess distal pulses at foot, as long as there is a pulse or dopplerable signal in the foot it is not essential to revascularize other injured tibial vessels
- Peroneal and posterior tibial artery injuries are best exposed through medial approach, the anterior tibial artery is most easily exposed later to the tibia in the anterior compartment
- With proximal tibial artery injuries it is often easier to bypass to a normal tibial artery more distally than in the zone of injury
- Short tibial- tibial interposition grafts with reversed greater saphenous vein are a reasonable solution
- Tibial veins should be ligated, do not waste time trying to repair them, they may also be divided to improve arterial exposure

# Source
Defense Medical Readiness Training Institute