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Biomedical subjects

J A Bullen

Publications and source records attributed to J A Bullen.

10 recordsLinked to original sources
PubMed1995

Topographic quantitative EEG measures of alpha and theta power changes during caffeine withdrawal: preliminary findings from normal subjects.

Neurophysiological consequences of withdrawal from caffeine are poorly understood. In particular, quantitative studies of EEG changes that may occur during the period of caffeine abstinence in caffeine dependent individuals have not been reported. In this pilot study, 13 physically- and psychiatrically-normal caffeine users were asked to abstain from caffeine for a period of 4 days. Quantitative EEGs were obtained prior to stopping caffeine and on Days 1, 2, and 4 of the caffeine abstinence period. Results indicated that significant increases in alpha and theta absolute power accompany the caffeine withdrawal process with return to the pre-abstinent EEG levels when caffeine usage is resumed. The implications of these findings are discussed with special reference to the possible need to control for the variable of caffeine usage in quantitative EEG studies of other phenomena.

Adolescent↗
PubMed1995

A standardized form for DSM-IV review of symptoms and mental status examination for students and residents.

A common error by medical students and residents is the inadvertent omission of some part of the mental status examination or failure to screen for a psychiatric diagnosis that is not evident on the patient's presentation. The authors introduce a structured questionnaire and standardized form to guide psychiatric and generalist medical trainees through the mental status examination. Based on criteria from the Diagnostic and Statistical Manual of Mental Disorders--Fourth Edition (DSM-IV), the questionnaire and form are intended to facilitate a psychiatric review of patients without missing key points.

Humans↗
PubMed1991

A short evaluation of a new haematological cell counter--the Cell-Dyn 3000--following a modified tentative NCCLS-procedure.

The proposed procedure offers a method of evaluation that is feasible, but still a very precise method, for the evaluation of electronic differential leukocyte counters. Following this abbreviated method, the classification of the leukocytes, from 5 x 20 unselected blood specimens, with a flow-cytometric analysis by the Sequoia Turner Cell-Dyn 3000, was compared with microscopic differential counts as the standard. With proven accuracy and good reproducibility, the Cell-Dyn 3000 is a good sieve for the selection of normal samples. The high sensitivity and fair specificity permits a reduction of the differential workload to about 30 percent of the normal workload.

Disease↗