[Lumbar epidural hematoma and spinal abscess following peridural anesthesia].

Epidural application of local anesthetics or opiates is commonly used for treatment of severe pain or arterial obstruction. We discuss two cases of complications following peridural anesthesia. As an acute complication, a lumbar epidural hematoma developed hours after placement of the catheter and caused sciatic pain and nearly complete paraplegia. The hemorrhage might have been promoted by heparinization. After decompressive hemilaminectomy the patient recovered but was disabled by a persistent paresis. The second patient suffered from renal failure, arterial obstruction, and phantom limb pain. A peridural catheter was kept in place for 6 weeks. Five months later the patient developed severe sciatica. Spinal computed tomography showed compression of the cauda at the L4/5 level (Fig.4) caused by an abscess that was opened and drained. After insertion of a gentamicin - PMMA - chain (Septopal), the wound healed primarily but the patient suffered from persistent pain. The incidence of vessel puncture after insertion of a peridural catheter is about 1%-10%. The risk of hemorrhage, perforation of the dura, and nerve root irritation is increased in scoliotic or elderly patients with a narrow spinal canal. Persistent pain after removal of the catheter is the most important sign. Although paraplegias following peridural catheterization can occur without anticoagulants, even low-dose heparinization is potentially dangerous. The risk of infectious complications after long-term peridural catheterization may be up to 20%. Hematogenous metastatic infection is more common in patients with malignancies or multiple risk factors than continuous immigration of bacteria. Epidural hematomas and spinal abscesses can cause disability and persistent neurological deficit in spite of aggressive surgical and antibiotic therapy.