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David S. Baskin, MD; Jeffrey L. Browning, MS; Francis J. Pirozzolo, PhD; Sonja Korporaal, RN; Juli A. Baskin, RN, BSN; Stanley H. Appel, MD

Arch Neurol. 1999;56:1121-1123.

Objective  To determine whether higher brain levels of choline acetyltransferase (ChAT) are associated with improved neuropsychological function in patients with Alzheimer disease (AD).

Design  Case series with single-blind post hoc analysis of biopsy specimens.

Setting  Urban hospital and medical school.

Patients  A consecutive sample of 8 patients with AD undergoing brain biopsy and surgical implantation of intraventricular pumps for administration of potential chemotherapeutic agents.

Interventions  Brain biopsy, surgical implantation of intraventricular pumps, and, in 1 patient, ventriculoperitoneal shunt placement.

Main Outcome Measures  All patients underwent neuropsychological testing no more than 2 weeks before surgical biopsy. Levels of ChAT were determined in fresh brain tissue from biopsy samples.

Results  Significant positive correlations were found between ChAT levels and 2 neuropsychological test scores, Mini-Mental State Examination and the Logical Memory subtest of the Wechsler Memory Scale.

Conclusion  Degeneration of the cholinergic system in vivo correlates with decreasing cognitive function in patients with AD.

From the Neurosurgery Section, Department of Surgery, Veterans Affairs Medical Center (Dr Baskin and Mr Browning), and the Departments of Neurosurgery (Dr Baskin, Mr Browning, and Mss Korporaal and Baskin), Anesthesia (Dr Baskin), and Neurology (Drs Pirozzolo and Appel), Baylor College of Medicine, Houston, Tex.

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