Percutaneous venoarterial (VA) extracorporeal membrane oxygenation (ECMO) is a widely used mechanical circulatory support for life-threatening cardiopulmonary conditions,1 which is also recently used in cases of coronavirus disease 2019-associated cardiogenic shocks.2 With this method, however, femoral vascular access frequently leads to severe ischemia of the leg.1 We encountered a case of lower leg compartment syndrome due to limb ischemia following the use of VA ECMO. Extensive tissue necrosis, infection, and neurological deficit suggested a possible indication for amputation. Nevertheless, we tried to salvage the limb with the use of free tissue transfer to meet the patient’s desire and obtained satisfactory functional and aesthetic outcomes. Few reports so far have focused on limb reconstruction after relatively common ECMO-related complications of limb necrosis, and so the therapeutic strategy is discussed in the present report.
The patient was a 14-year-old boy with arrhythmogenic right ventricular cardiomyopathy, which is known to cause cardiac arrest (CA) in young people.3
During a table tennis match, the patient had a heart attack and went into CA. He was immediately transferred to the intensive care unit of a nearby hospital, and a VA ECMO was inserted into his right femoral vessels. On day 3, the circulatory condition was stabilized and the ECMO was removed. On day 4, redness and swelling, which are signs of compartment syndrome, emerged on the right lower limb, and a fasciotomy was performed immediately. After extubation on day 5, myonecrosis progressed with sensory and motor deficits in wide areas of the right lower leg. Repetitive surgical debridement and negative pressure wound therapy were performed, but these could not resolve the infection. Further debridement was unfeasible at the initial hospital; so the patient was transferred to our hospital 2 months after CA for limb reconstruction, which was strongly desired by the patient and his family.
On admission to our institution, necrotic tissue was distributed in wide areas of the anteromedial and anterolateral compartment with 45-degree ankle equinus. Magnetic resonance imaging revealed residual abscesses and tibial osteomyelitis. Additional debridement (including tibial sequestrectomy) was conducted (Fig. 1). Negative pressure wound therapy was continued in conjunction with antibiotic therapy. After 1 month of hospitalization at our institution, the tibial osteomyelitis improved, and limb reconstruction surgery was performed using free latissimus dorsi muscle with the scapular tip.4 The composite flap supplied by a single subscapular artery pedicle was harvested from the ipsilateral side (Fig. 2). The latissimus dorsi muscle was used to cover the anterolateral defect, and the scapular tip, which was based on the angular branch of the thoracodorsal artery, was cut out into 4 × 4 cm to fill the tibial sequestrectomy to ensure bone strength for full weight bearing (Fig. 3). The arterial anastomoses were performed in a flow-through manner: the subscapular artery, including the circumflex scapular artery stump as a T segment, was interposed to the transected anterior tibial artery to preserve distal perfusion.5 Venous anastomosis to the venae comitantes of the anterior tibial artery was performed in an end-to-end fashion. The surface of the transferred latissimus dorsi muscle and the anteromedial defect was covered with split-thickness skin grafts taken from the edges of the donor site.
The postoperative course was uneventful. Five months after CA, the patient was transferred to a pediatric cardiologist for the treatment of arrhythmogenic right ventricular cardiomyopathy. Although ankle equinus remained, he could walk with the aid of an ankle foot orthosis and went back to junior high school 6 months after CA. There have been no long-term complications related to the reconstruction surgery, and he and his family were satisfied with the aesthetic and functional outcomes at 1 year after CA (Fig. 4).
We encountered a case of VA ECMO-induced lower limb ischemia with subsequent compartment syndrome. Soft tissue necrosis and tibial osteomyelitis were successfully treated, and the limb was salvaged by free tissue transfer with a good functional outcome and great patient satisfaction.
VA ECMO is a widely used life-saving procedure for cardiopulmonary failure, but it is known to have a high risk of distal limb ischemia mainly due to retrograde perfusion through the femoral artery cannula obstructing forward flow of the limb. The reported incidence of limb ischemia ranges from 10% to 70%, and subsequent ischemia–reperfusion is known to cause compartment syndrome with an incidence of 4% to 12%.1 To date, few studies have focused on treatment strategies in cases where compartment syndrome gives rise to severe necrotic tissue damage.
Selecting limb preservation was an essential issue in the present case, although there are currently no established guidelines for deciding between early amputation and reconstruction for severe lower limb injuries.6 Given that extensive tissue necrosis even involved the osteomyelitis and caused neurological deficits, it was possible that there was no choice but to amputate. However, considering the patient’s young age and the family’s strong desire, we chose limb reconstruction as the desirable therapeutic option.
The most important point for the satisfactory outcome in this case was the availability of a wide range of composite flaps to reconstruct virtually any kind of defects that could be brought about after extensive debridement. In particular, osseous reconstruction enabled us to perform tibial sequestrectomy. Infection control of the wound bed is critical for flap survival. Without osseous reconstruction, we could not debride the tibial bone to eradicate osteomyelitis; so we would have no choice but to amputate. Among the various free flaps proposed for lower limb reconstruction,4,5,7–9 the subscapular composite flap was suitable for the present case because of its low donor site morbidity,7 early bone union,8 and availability of simultaneous transfer of bone and soft tissue with a single vascular pedicle for limited recipient vessels in the lower extremity. The osseous reconstruction with the scapula bone enabled aggressive tibial debridement not only to enhance flap survival but also to prevent recurrence of osteomyelitis.10 In addition, it enabled full weight bearing, which definitely contributed to good functional outcome and great patient satisfaction in the present case.
This study was conducted in accordance with the Declaration of Helsinki.
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