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Schizophr Res. 2015 Mar;162(1-3):14-21. doi: 10.1016/j.schres.2015.01.019. Epub 2015 Jan 22.

Abnormal white matter integrity in antipsychotic-naïve first-episode psychosis patients assessed by a DTI principal component analysis.

Author information

1
Laboratory of Experimental Psychiatry, Instituto Nacional de Neurología y Neurocirugía, Mexico City, Mexico.
2
Laboratory of Experimental Psychiatry, Instituto Nacional de Neurología y Neurocirugía, Mexico City, Mexico; Department of Education, Instituto Nacional de Neurología y Neurocirugía, Mexico City, Mexico.
3
MR Advanced Applications, GE Healthcare, Mexico City, Mexico.
4
Early Psychosis Intervention Department, Hospital Fray Bernardino Álvarez, Mexico City, Mexico; Palliative Care Unit, Instituto Nacional de Cancerología, Mexico City, Mexico.
5
Instituto Nacional de Medicina Genómica, Mexico City, Mexico.
6
Neuropsychiatry Department, Instituto Nacional de Neurología y Neurocirugía, Mexico City, Mexico.
7
Multimodal Neuroimaging Schizophrenia Group, Research Imaging Centre and Geriatric Mental Health Program, Centre for Addiction and Mental Health, Department of Psychiatry, University of Toronto, Canada.
8
Maryland Psychiatric Research Center, Department of Psychiatry, University of Maryland School of Medicine, Baltimore, USA; Russell H. Morgan Department of Radiology and Radiological Science, Johns Hopkins University, Baltimore, USA.
9
Laboratory of Experimental Psychiatry, Instituto Nacional de Neurología y Neurocirugía, Mexico City, Mexico; Neuropsychiatry Department, Instituto Nacional de Neurología y Neurocirugía, Mexico City, Mexico. Electronic address: fcamilo@unam.mx.

Abstract

INTRODUCTION:

Diffusion tensor imaging (DTI) studies in patients with schizophrenia have shown abnormalities in the microstructure of white matter tracts. Specifically, reduced fractional anisotropy (FA) has been described across multiple white matter tracts, in studies that have mainly included patients treated with antipsychotic medications.

OBJECTIVE:

To compare FA in antipsychotic-naïve patients experiencing a first episode of psychosis (FEP) to FA in healthy controls to demonstrate that the variance of FA can be grouped, in a coincidental manner, in four predetermined factors in accordance with a theoretical partition of the white matter tracts, using a principal components analysis (PCA).

METHODS:

Thirty-five antipsychotic-naïve FEP patients and 35 age- and gender-matched healthy controls underwent DTI at 3T. Analysis was performed using a tract-based spatial statistics (TBSS) method and exploratory PCA.

RESULTS:

DTI analysis showed extensive FA reduction in white matter tracts in FEP patients compared with the control group. The PCA grouped the white matter tracts into four factors explaining 66% of the total variance. Comparison of the FA values within each factor highlighted the differences between FEP patients and controls.

DISCUSSION:

Our study confirms extensive white matter tracts anomalies in patients with schizophrenia, more specifically, in drug-naïve FEP patients. The results also indicate that a small number of white matter tracts share common FA anomalies that relate to deficit symptoms in FEP patients. Our study adds to a growing body of literature emphasizing the need for treatments targeting white matter function and structure in FEP patients.

KEYWORDS:

Diffusion tensor imaging; First-episode psychosis; Fractional anisotropy; Principal component analysis; Schizophrenia; TBSS

PMID:
25620120
PMCID:
PMC4339463
DOI:
10.1016/j.schres.2015.01.019
[Indexed for MEDLINE]
Free PMC Article

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