Management of Gunshot Injuries to the Leg

Diagnosis and Evaluation

Paresthesia and weak peripheral pulses in a gunshot wound to the leg represent "weak signs" of vascular injury, which requires prompt evaluation and management, indicating a 3-25% risk of arterial injury 1, 2
The American College of Surgeons recommends CT angiography when weak signs of vascular injury are present, allowing visualization of vascular injury without unnecessary surgical exploration while identifying undiagnosed vascular lesions 1
Ankle-Brachial Index (ABI) <0.9 has 87% sensitivity and 97% specificity for diagnosing vascular injury, and should be measured if available 1
A rapid bedside assessment with handheld continuous-wave Doppler should be performed before proceeding to exploration and repair, as loss of Dopplerable arterial signal confirms a threatened limb 2
Absence of both arterial and venous Doppler signals may indicate irreversible damage, but this assessment should not delay definitive treatment when clinical signs already suggest vascular compromise 2

If active bleeding is present and direct compression is ineffective, tourniquet application is recommended, with re-evaluation of tourniquet effectiveness and necessity as soon as possible to limit ischemic complications 1
The American College of Surgeons recommends revascularization before orthopedic fixation to reduce hospitalization time and lower fasciotomy rates 1
For Category IIa/IIb ALI (marginally or immediately threatened limbs), revascularization should be performed emergently (within 6 hours) 2
Penetrating injuries like gunshot wounds with signs of vascular compromise require early surgical bleeding control 3
During exploration, address vascular injury first to restore blood flow, evaluate and repair nerve damage, assess for compartment syndrome, manage bone injuries if present, and remove bullet fragments and debride devitalized tissue 2

If tourniquet is required, consider applying a second tourniquet distal to the first before loosening the proximal one, to minimize ischemic complications 1

Monitor for compartment syndrome development, which is common in high-energy penetrating injuries, and consider prophylactic fasciotomy in high-risk cases 1, 4
Monitor for compartment syndrome development and consider low-dose regional analgesia that preserves some sensory function to allow detection of breakthrough pain 4
Implement antibiotic therapy for operative injuries 4
Prolonged ischemia (>6-8 hours) is the most common factor leading to amputation in ALI, highlighting the importance of prompt intervention 2
Gunshot injuries are high-energy penetrating injuries at high risk of acute compartment syndrome (ACS), and early fasciotomies may be necessary in high-risk cases 4