Implementation of an enoxaparin protocol for venous thromboembolism prophylaxis in obese surgical intensive care unit patients.

BACKGROUND: Venous thromboembolism (VTE) is a serious health care issue that affects a large number of people. Few standards exist for delineating the optimal dosing strategy for VTE prevention in obese patients, especially in the setting of major surgery or trauma. OBJECTIVE: To document the efficacy of a surgical intensive care unit (SICU)-specific, weight-based dosing protocol of enoxaparin 0.5 mg/kg given subcutaneously every 12 hours for VTE prophylaxis in morbidly obese (defined as body mass index [BMI] ≥35 kg/m(2) or weight ≥150 kg) SICU patients, using peak anti-factor Xa levels to determine therapeutic endpoints. METHODS: Data were collected retrospectively in an academic, university-based SICU on 23 morbidly obese patients who received weight-based enoxaparin for VTE prophylaxis from December 1, 2008, through June 30, 2010. RESULTS: A weight-based dosage range of enoxaparin 50-120 mg twice daily (median 60) was given to 23 patients. The mean BMI was 46.4 kg/m(2). The initial mean anti-factor Xa level (measured after the third dose) was 0.34 IU/mL (range 0.20-0.59). Patients received an average of 18 doses. Two cases required an increase or decrease in dosage based on anti-factor Xa levels. Morbidity related to this dosing included a single event of minor endotracheal bleeding and a single deep vein thrombosis that was likely present prior to treatment. CONCLUSIONS: Weight-based dosing with enoxaparin in morbidly obese SICU patients was effective in achieving anti-factor Xa levels within the appropriate prophylactic range. This regimen reduced the rate of VTE below expected levels and no additional adverse effects were reported.

Plasmapheresis and Intravenous Immune Globulin Improve Neurologic Outcome of Central Pontine Myelinolysis Occurring Post Orthotopic Liver Transplant.

OBJECTIVE: To report 2 cases of central pontine myelinolysis (CPM) post liver transplantation in which treatment with plasmapheresis and intravenous immune globulin improved expected neurologic outcome. CASE SUMMARY: Two patients who underwent orthotopic liver transplant developed CPM early in their postoperative course. Magnetic resonance imaging of the brain demonstrated severe demyelination of either the pons or the midbrain, respectively. Both patients developed significant neurologic abnormalities, including acute mental status changes, severe muscle weakness, spasticity, and/or prolonged paralysis. Pretransplant laboratory results indicated serum sodium levels fluctuating between 115 mEq/L and 152 mEq/L. Both patients received 6 days of plasmapheresis (PP) followed by 5 consecutive days of intravenous immune globulin (IVIG). Significant neurologic improvement was experienced at 2 and 4 weeks, respectively, after therapy was initiated. Complete resolution of neurologic symptoms was evident at 1 year follow-up. DISCUSSION: Currently, specific guidelines or recommendations for the treatment of CPM are practically nonexistent. CPM remains a neurologic complication that is difficult to treat and may result in permanent significant neurologic sequelae. The etiology and pathogenesis of this disease are unclear, although aggressive osmolar correction, particularly in the setting of hyponatremia, is the main risk factor. While patients may eventually show some improvement with supportive care, progress is often protracted, and complete resolution of symptoms is exceedingly rare. The severity of the midbrain lesions juxtaposed against the rapidity of symptom resolution in these 2 patients alludes to a potential therapeutic benefit after initiation of therapy with PP and IVIG. CONCLUSIONS: These cases suggest that prompt recognition of CPM and initiation of PP and IVIG may help modulate its progress and improve long-term neurologic outcome.