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Thomas W. Langfitt, Paul D. Shawaluk, Ronald P. Mahoney, Sherman C. Stein and Thomas R. Hedges

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Sherman C. Stein, Ayub K. Ommaya, John L. Doppman and Giovanni Di Chiro

✓ A case is presented in which an arteriovenous malformation of the cauda equina received all of its arterial supply from branches of the internal iliac arteries. Surgical excision of the malformation was successfully accomplished. The need for thorough knowledge and arteriographic demonstration of all possible routes of arterial supply for such lesions is stressed.

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Normal-pressure hydrocephalus

Predicting the results of cerebrospinal fluid shunting

Sherman C. Stein and Thomas W. Langfitt

✓ After shunting, 43 patients with normal-pressure hydrocephalus were followed for 6 to 30 months. All patients had complete preoperative clinical evaluations, pneumoencephalograms, and isotope cisternography; in addition, 21 had saline infusion studies, and 15 had biopsies. Of the 10 patients in whom the etiology of the hydrocephalus was known eight (80%) were significantly improved. Of the other 33 patients, 21 (64%) showed some improvement; this was substantial and sustained in only eight (24%). The whole series of patients with idiopathic normal pressure hydrocephalus was divided into two groups on the basis of shunt response and the relative predictive values of preoperative tests. No significant association was found between the results of shunting and preoperative clinical factors, pneumoencephalography, isotope cisternography, saline infusion tests, or various combinations of clinical and laboratory abnormalities. The significance of these findings is discussed.

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Enrique Klériga, Joanna Hollenberg Sher, Sanath-Kumar Nallainathan, Sherman C. Stein and Michael Sacher

✓ A child treated for a desmoplastic medulloblastoma of the left cerebellar hemisphere at the age of 10 months developed a malignant astrocytoma in the same site 11 years later. Theories of origin of the second tumor, particularly in relation to concepts of the genesis of medulloblastoma in general, are discussed.

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Sherman C. Stein and Stewart Apfel

✓ A method of measuring flow rate through cerebrospinal fluid (CSF) shunts is reported. It consists of two thermistors in series applied to the skin over the shunt tubing. The thermistors respond by a drop in measured temperature following application of an ice cube placed on the skin overlying the proximal shunt tube. The time required for the thermal response to travel between the two thermistors is related to the velocity of flow through the shunt tubing. Flow rate can then be calculated using the internal diameter of the tubing. A series of animal experiments employing a constant infusion of mock CSF through subcutaneously implanted shunt tubing showed excellent correlation between calculated flow rates and actual infusion rates. The device is noninvasive and easily adapted to use in patients. The measurements are readily repeatable.

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Myles E. Gombert, Sheldon H. Landesman, Michael L. Corrado, Sherman C. Stein, Ellen T. Melvin and Marinella Cummings

✓ Three patients with Staphylococcus epidermidis meningitis associated with cerebrospinal fluid (CSF) shunt devices were treated with a combination of intravenous vancomycin and oral rifampin. Two of the isolates were methicillin-resistant. All patients had a favorable clinical response. Time-kill curves showed that the addition of rifampin to vancomycin resulted in enhanced bactericidal activity against all isolates when compared to either antibiotic alone. This finding suggests that the combination of oral rifampin and intravenous vancomycin may be useful in the treatment of methicillin-resistant and recalcitrant methicillin-sensitive S. epidermidis meningitis associated with CSF shunts. In vitro susceptibility testing should be performed.

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Sherman C. Stein and Steven E. Ross

✓ The purpose of this study is to determine the initial treatment of patients who appear to have sustained moderate head injuries when first evaluated. The authors reviewed the records of 341 patients whose initial Glasgow Coma Scale (GCS) scores ranged from 9 to 12, as well as another 106 patients with GCS scores of 13. All patients underwent cranial computerized tomography (CT) at the time of admission.

In 40.3% of these patients the CT scans were abnormal (30.6% had intracranial lesions), and 8.1 % required neurosurgical intervention (craniotomies for hematoma in 12, elevation of depressed fractures in five, and insertion of intracranial pressure monitors in 19). Four patients died of their intracranial injuries. A similar incidence of lesions found on CT and at surgery suggests that an initial GCS score of 13 be classified with the moderate head injury group. Skull fractures were found to be poor indicators of intracranial abnormalities.

These results suggest that all patients with head injury thought to be moderate on initial examination be admitted to the hospital and undergo urgent CT scanning. Patients with intracranial lesions require immediate neurosurgical consultation, surgery as needed, and admission to a critical-care unit. Scans should be repeated in patients whose recovery is less rapid than expected and in all patients with evidence of clinical deterioration; this was necessary in almost half of the patients in this group, and 32% were found to have progression of radiological abnormalities on serial CT scans.

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Sherman C. Stein

The neurosurgical profession has taken a circuitous route to attain its current knowledge about timing for aneurysm surgery. While addressing the timing issue, neurosurgeons were beset by many pressures simultaneously. They were forced to justify not only optimal surgical techniques but the need for surgery at all in the treatment of ruptured aneurysms. The beliefs of surgeons with strong personalities, in addition to intuitive guesses, often served to guide surgery in the absence of scientific evidence. That any progress could be made against a background of desperately ill patients and frustrating early results is remarkable. The author briefly outlines the controversies and misdirection that accompanied this progress toward understanding surgical timing in the treatment of ruptured aneurysms.