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2 results on '"Reid, Philip D."'

1. Dexamethasone suppression test reversal in rapid transcranial magnetic stimulation-treated depression.

Author

Reid, Philip D. and Pridmore, Saxby

Subjects
*PROLACTINOMA, *THERAPEUTICS
Abstract

Objective: The aim of this paper is to report the effect of rapid transcranial magnetic stimulation (rTMS) on the mood and dexamethasone suppression test (DST) of a patient with major depressive disorder (DSM-IV). Clinical picture: A 36-year-old woman with a past history of prolactinoma and recurrent major depressive disorder presented with major depression on three separate occasions over a 3-month period. DST was positive on each occasion. Treatment: During each episode, a course of rTMS was given. Courses varied from seven to 13 once-daily treatment sessions depending on clinical response. These treatment sessions were 20 trains of 10 Hz for 5 s at 100% of motor threshold. Outcome: Remission was achieved, psychiatric rating scales improved and the DST status converted from positive to negative. There were no side effects. Conclusion: DST status in major depressive disorder can be converted from positive to negative by rTMS. This so far unreported observation increases our knowledge of rTMS. [ABSTRACT FROM AUTHOR]

Published
1999
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2. Cortical excitability of psychiatric disorders: reduced post-exercise facilitation in depression compared to schizophrenia and controls.

Author

Reid, Philip D., Daniels, Brett, Rybak, Marzena, Turnier-Shea, Yvonne, and Pridmore, Saxby

Subjects
*SCHIZOPHRENIA, *EVOKED potentials (Electrophysiology)
Abstract

Objective: In normal subjects, motor evoked potentials (MEPs) produced by transcranial magnetic stimulation (TMS) from the motor cortex are increased after non-fatiguing exercise of hand muscles. This phenomenon is called post-exercise facilitation. This study aims to test the hypothesis that psychiatric syndromes (major depressive episode, schizophrenia) have different levels of post-exercise facilitation compared to controls. Methods: Patients with DSM-IV major depressive episode (six female, four male), schizophrenia (two female, nine male) and a control group (nine female, four male) participated. MEPs were elicited pre- and post-exercise from the contralateral abductor pollicis brevis by TMS over the primary motor cortex. Results: Post-exercise facilitation expressed as a percentage of baseline was 510% in controls, 110% in depression and 190% in schizophrenia. There were significant differences in patients with depression and schizophrenia compared to controls (p = 0.0001, p = 0.0008). Conclusions: Post-exercise facilitation was reduced in depression and schizophrenia, suggesting impaired cortical excitability in these disorders. Further studies may discriminate between the two groups. [ABSTRACT FROM AUTHOR]

Published
2002
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