Erythropoietin-augmented isovolemic hemodilution in skull-base surgery. Case report.

Human erythropoietin in concert with intraoperative hemodilution, tumor embolization, and surgical staging was used to manage a red blood cell mass in an anemic Jehovah's Witness patient with a hypervascular meningioma. Erythropoietin (3000 U thrice weekly) and oral iron (1300 mg daily) were given for 1 month prior to surgery, raising the hemoglobin level from 11.8 to 14.1 gm/100 ml. A posterior fossa craniectomy combined with a temporal craniectomy was then performed so that partial petrosectomy, section of the transverse sinus, incision of the tentorium, and exposure of the lesion could be carried out. The first stage of the surgery was terminated immediately prior to tumor mobilization. Isovolemic hemodilution was initiated just before the skin incision. Postoperatively, the hemoglobin concentration dropped to 11.5 gm/100 ml. The erythropoietin dose was doubled and administration of oral iron continued, leading to a hemoglobin level of 14.0 gm/100 ml at 1 month after the first operation. The tumor was embolized using superselective catheterization. The next day, at the second stage of the surgery, the tumor was extirpated, again employing isovolemic hemodilution. By the 4th postoperative day, the hemoglobin level had dropped to 9.4 gm/100 ml. The patient made an uncomplicated recovery. Erythropoietin therapy contributed substantially to the successful outcome of this case. Since erythropoietin has the potential to augment all other forms of autologous banking, its role in elective neurosurgery may become increasingly important in an era of heightened concern about heterologous transfusion.

Spinal epidural abscesses. Surgical and parasurgical management.

42 cases of spinal epidural abscesses were operated on in the years 1957-1980, among approximately 8,000 spinal operations. Staphylococcus aureus was the microorganism most commonly isolated from infected material and the primary source of infection was in most cases cutaneous and/or subcutaneous lesions. Typical clinical history included back pain and fever, with progressive nerve root and spinal cord involvement. The cases were divided into three groups according to the operative findings: (a) acute abscesses; (b) chronic abscesses, and (c) mixed or subacute abscesses. These three groups differed as to duration of illness, incidence of meningeal signs, white blood cell concentration and lumbar puncture results. Plain X-rays were positive in 20% of cases. Myelography, whose indications were maximally restricted, gave in some instances inaccurate results. Treatment consisted of extensive laminectomy of all the affected spinal segments, and drainage of infected material. Local and systemic appropriate antibiotic therapy was also given. An average of 16 daily sessions of barotherapy, consisting of 1.7-2.0 atm given in 40-60 min, were administered in the last 9 cases. When compared with the patients to which barotherapy was not given, these cases showed a lower rate of permanent disability (11 vs. 21%), even if they were managed under less favorable clinical and neurological conditions. These results seem to support a favorable role of hyperbaric treatment in the management of spinal epidural abscesses. Early diagnosis and appropriate management remain essential in order to have satisfactory treatment results.