Details of Atypical Antipsychotic Drugs for Schizophrenia Patients. Resting-State Functional MR Imaging Data Acquisition and
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1 RSNA, /radiol Appendix E1 Details of Atypical Antipsychotic Drugs for Schizophrenia Patients After baseline assessment, all patients were treated with atypical antipsychotic drugs, with dosing and drug selection determined by the treating psychiatrist. Treatment at 1-year follow-up consisted of risperidone (in 13 cases), at a mean dose of 2.67 mg/d ± 1.87; quetiapine (in four cases), at a mean dose of mg/d ± ; clozapine (in three cases), at a mean dose of mg/d ± 26.13; olanzapine (in two cases), at a mean dose of 4.66 mg/d ± 5.7; sulpiride (in two cases), at a mean dose of 438 mg/d ± 347.9; and aripiprazole (in one case), at a mean dose of 20 mg/d. The number of patients who were treated with the different drugs exceeds the total number of patients because some patients received more than one medication. The dosage of antipsychotic medication at 1-year follow-up was converted to chlorpromazine equivalent dosages, with the mean (standard deviation) dose of mg/d ± (35). Resting-State Functional MR Imaging Data Acquisition and Preprocessing All subjects underwent rfmr imaging with a 3-T MR imaging system (Excite; GE Healthcare, Milwaukee, Wis) and an eight-channel phased-array head coil. The daily quality assurance protocol was used to establish the stability of the MR imaging system by using a water phantom. During imaging, subjects were instructed to relax with their eyes closed and without falling asleep or directed, systematic thought (which was confirmed by a self-report of subjects immediately after the experiment). Page 1 of 11
2 Before imaging, all participants were instructed not to think of anything in particular and keep their eyes closed during rfmr imaging; afterward, we asked participants the following questions: (a) Were you awake during imaging? (b) Did you keep your eyes closed during imaging? (c) Were you thinking of anything specific during imaging? Nevertheless, we acknowledge that we had no way of knowing for sure what subjects were thinking about during imaging. MR images that were sensitized to changes in BOLD signal levels were obtained with a gradient-echo echoplanar imaging sequence and the following parameters: repetition time/echo time, 2000/30 msec; flip angle, 90 ; section thickness, 5 mm, with no intersection gaps; matrix size, 64 64; field of view, mm 2 ; and voxel size, mm 3. Each brain volume comprised 30 axial sections, and each functional run contained 200 image volumes that were preceded by five dummy volumes, resulting in a total imaging time of 410 sec. For each participant, the first five dummy volumes were discarded to allow for imager stabilization and the subject s adaptation to the environment; the remaining gradient-echo echoplanar imaging functional images were section-time corrected, realigned to the middle volume, and realigned by using a six-parameter (rigid body) linear transformation. We used the Friston 24-parameter model to regress out head motion effects from the realigned data on the basis of recent reports in which higher-order models demonstrated benefits in removing head motion effects (36 38). White matter and cerebrospinal fluid signals were regressed out. In addition, linear trend was also included as a regressor, since BOLD signal can demonstrate low-frequency drift. After that, all functional images were spatially normalized to the Montreal Neurologic Institute template, and each voxel was resampled to mm 3, and a spatial smoothing transformation was conducted with an 8-mm full-width half-maximum Gaussian kernel. Page 2 of 11
3 In the present study, the head translation movement of all participants was less than 1.5 mm, and the rotation was less than 1.5. Moreover, recommended by previous studies, the mean framewise displacement of head motion was computed and used as a covariate in all group functional voxel-wise analyses, which derived with Jenkinson relative root mean square algorithm and considered the voxel-wise differences in motion in its derivation (17,18,37). At baseline, the framewise displacement of patients and control subjects was mm ± and mm ± 0.018, respectively. At 1-year follow-up, the framewise displacement of patients and control subjects was mm ± and mm ± 0.03, respectively, and there was no group (ie, patients and control subjects) by time (ie, baseline and 1-year follow-up) interaction (P =.444), main effect of group (P =.44), or main effect of time (P =.581). ALFF Calculation ALFF was calculated by using Data Processing Assistant for Resting-State fmr imaging (DPARSF) software (15). ALFF is proportional to the strength or intensity of low-frequency oscillations and is thought to reflect spontaneous neural activity (6). In brief, after the preprocessing that was previously mentioned, the time series for each voxel was transformed to the frequency domain without band-pass filtering, and the power spectrum was obtained. Then, the power spectrum was square root transformed and averaged across Hz at each voxel. The averaged square root of power in this frequency band was taken as the ALFF (15). Then, with the standardization procedure, the individual ALFF map was normalized by the individual s global mean ALFF; more specifically, the mean across voxels for ALFF map was calculated, and the value at each voxel was divided by the mean individually. FC Analysis Page 3 of 11
4 By focusing on connectivity with regions in which group-by-time interaction in regional ALFF was observed, we proceeded in a hypothesis-driven manner to test for altered FC with broader brain circuitry specifically involving regions in which altered regional activity was demonstrated. FC was examined by using a seed voxel correlation approach to establish the circuitry implications of the alterations in regional function. After band-pass filtering ( Hz), a reference time series for each seed was extracted by averaging the rfmr imaging time series of voxels within each seed region. Pearson correlation analyses were performed between each seed time series and the filtered time series from brain voxels outside the seed regions in a voxel-wise manner. The correlation coefficients between the time course of seed regions and every other brain voxel were transformed to z values by using the Fisher r-to-z transformation to improve normality and facilitate statistical analysis. For the patients and control subjects groups at both time-points, individual z value maps of FC were analyzed with a random effect one-sample t test to identify voxels that showed significant positive and negative correlations to the time course of seed regions. The significance level for each group at each time point was set at uncorrected P <.001. For two-way analysis of variance with a repeated measures design that compared patients and control subjects over time, the FC comparison was restricted to voxels with significant positive or negative correlations in both patients and control subjects at baseline and 1-year follow-up by using an explicit mask from the union set of one-sample t test results of the two groups at both time points. References 1. Meyer-Lindenberg A. From maps to mechanisms through neuroimaging of schizophrenia. Nature 2010;468(7321): Page 4 of 11
5 2. van Os J, Kapur S. Schizophrenia. Lancet 2009;374(9690): Ren W, Lui S, Deng W, et al. Anatomical and functional brain abnormalities in drug-naive first-episode schizophrenia. Am J Psychiatry 2013;170(11): Keedy SK, Rosen C, Khine T, Rajarethinam R, Janicak PG, Sweeney JA. An fmri study of visual attention and sensorimotor function before and after antipsychotic treatment in firstepisode schizophrenia. Psychiatry Res 2009;172(1): Keedy SK, Reilly JL, Bishop JR, Weiden PJ, Sweeney JA. Impact of antipsychotic treatment on attention and motor learning systems in first-episode schizophrenia. Schizophr Bull 2015;41(2): Fox MD, Raichle ME. Spontaneous fluctuations in brain activity observed with functional magnetic resonance imaging. Nat Rev Neurosci 2007;8(9): Zuo XN, Xing XX. Test-retest reliabilities of resting-state FMRI measurements in human brain functional connectomics: a systems neuroscience perspective. Neurosci Biobehav Rev 2014;45: Lui S, Li T, Deng W, et al. Short-term effects of antipsychotic treatment on cerebral function in drug-naive first-episode schizophrenia revealed by resting state functional magnetic resonance imaging. Arch Gen Psychiatry 2010;67(8): Lui S, Deng W, Huang X, et al. Association of cerebral deficits with clinical symptoms in antipsychotic-naive first-episode schizophrenia: an optimized voxel-based morphometry and resting state functional connectivity study. Am J Psychiatry 2009;166(2): Page 5 of 11
6 10. Leucht S, Barnes TR, Kissling W, Engel RR, Correll C, Kane JM. Relapse prevention in schizophrenia with new-generation antipsychotics: a systematic review and exploratory metaanalysis of randomized, controlled trials. Am J Psychiatry 2003;160(7): Andreasen NC, Liu D, Ziebell S, Vora A, Ho BC. Relapse duration, treatment intensity, and brain tissue loss in schizophrenia: a prospective longitudinal MRI study. Am J Psychiatry 2013;170(6): Fusar-Poli P, Smieskova R, Kempton MJ, Ho BC, Andreasen NC, Borgwardt S. Progressive brain changes in schizophrenia related to antipsychotic treatment? A meta-analysis of longitudinal MRI studies. Neurosci Biobehav Rev 2013;37(8): Girgis RR, Diwadkar VA, Nutche JJ, Sweeney JA, Keshavan MS, Hardan AY. Risperidone in first-episode psychosis: a longitudinal, exploratory voxel-based morphometric study. Schizophr Res 2006;82(1): Kay SR, Fiszbein A, Opler LA. The positive and negative syndrome scale (PANSS) for schizophrenia. Schizophr Bull 1987;13(2): Chao-Gan Y, Yu-Feng Z. DPARSF: a MATLAB toolbox for pipeline data analysis of resting-state fmri. Front Syst Neurosci 2010;4(14): Zang YF, He Y, Zhu CZ, et al. Altered baseline brain activity in children with ADHD revealed by resting-state functional MRI. Brain Dev 2007;29(2): Jenkinson M, Bannister P, Brady M, Smith S. Improved optimization for the robust and accurate linear registration and motion correction of brain images. Neuroimage 2002;17(2): Page 6 of 11
7 18. Yan CG, Craddock RC, Zuo XN, Zang YF, Milham MP. Standardizing the intrinsic brain: towards robust measurement of inter-individual variation in 1000 functional connectomes. Neuroimage 2013;80: Song XW, Dong ZY, Long XY, et al. REST: a toolkit for resting-state functional magnetic resonance imaging data processing. PLoS One 2011;6(9):e Guillin O, Abi-Dargham A, Laruelle M. Neurobiology of dopamine in schizophrenia. Int Rev Neurobiol 2007;78: Abbott CC, Jaramillo A, Wilcox CE, Hamilton DA. Antipsychotic drug effects in schizophrenia: a review of longitudinal FMRI investigations and neural interpretations. Curr Med Chem 2013;20(3): Kapur S. Psychosis as a state of aberrant salience: a framework linking biology, phenomenology, and pharmacology in schizophrenia. Am J Psychiatry 2003;160(1): Lencer R, Keedy SK, Reilly JL, et al. Altered transfer of visual motion information to parietal association cortex in untreated first-episode psychosis: implications for pursuit eye tracking. Psychiatry Res 2011;194(1): Reilly JL, Harris MS, Keshavan MS, Sweeney JA. Abnormalities in visually guided saccades suggest corticofugal dysregulation in never-treated schizophrenia. Biol Psychiatry 2005;57(2): Xiao Y, Lui S, Deng W, et al. Altered cortical thickness related to clinical severity but not the untreated disease duration in schizophrenia. Schizophr Bull 2015;41(1): Fox MD, Greicius M. Clinical applications of resting state functional connectivity. Front Syst Neurosci 2010;4:19. Page 7 of 11
8 27. Pettersson-Yeo W, Allen P, Benetti S, McGuire P, Mechelli A. Dysconnectivity in schizophrenia: where are we now? Neurosci Biobehav Rev 2011;35(5): Yu R, Chien YL, Wang HL, et al. Frequency-specific alternations in the amplitude of lowfrequency fluctuations in schizophrenia. Hum Brain Mapp 2014;35(2): Mashal N, Vishne T, Laor N. The role of the precuneus in metaphor comprehension: evidence from an fmri study in people with schizophrenia and healthy participants. Front Hum Neurosci 2014;8: Cronenwett WJ, Csernansky J. Thalamic pathology in schizophrenia. Curr Top Behav Neurosci 2010;4: Howes OD, Kambeitz J, Kim E, et al. The nature of dopamine dysfunction in schizophrenia and what this means for treatment. Arch Gen Psychiatry 2012;69(8): Vita A, De Peri L. The effects of antipsychotic treatment on cerebral structure and function in schizophrenia. Int Rev Psychiatry 2007;19(4): Whitfield-Gabrieli S, Thermenos HW, Milanovic S, et al. Hyperactivity and hyperconnectivity of the default network in schizophrenia and in first-degree relatives of persons with schizophrenia. Proc Natl Acad Sci U S A 2009;106(4): [Published correction appears in Proc Natl Acad Sci U S A 2009;106(11):4572.] 34. Krystal JH, D Souza DC, Mathalon D, Perry E, Belger A, Hoffman R. NMDA receptor antagonist effects, cortical glutamatergic function, and schizophrenia: toward a paradigm shift in medication development. Psychopharmacology (Berl) 2003;169(3-4): Woods SW. Chlorpromazine equivalent doses for the newer atypical antipsychotics. J Clin Psychiatry 2003;64(6): Page 8 of 11
9 36. Friston KJ, Williams S, Howard R, Frackowiak RS, Turner R. Movement-related effects in fmri time-series. Magn Reson Med 1996;35(3): Yan CG, Cheung B, Kelly C, et al. A comprehensive assessment of regional variation in the impact of head micromovements on functional connectomics. Neuroimage 2013;76: Satterthwaite TD, Elliott MA, Gerraty RT, et al. An improved framework for confound regression and filtering for control of motion artifact in the preprocessing of resting-state functional connectivity data. Neuroimage 2013;64: Table E1. 95% CIs of the Difference in the Range of Values that Showed Significant Group-by-Time Interaction and Main Effects of Group or Time Value Patients and Controls at Patients at Baseline and Patients and Controls at Baseline Follow-up Follow-up ALFF Group-by-time interaction Right inferior parietal lobule 0.141, , Right orbitofrontal cortex 0.103, , Right occipital gyrus 0.162, , Main effect of group Right precuneus 0.366, , Right ventral medial PFC 0.222, , Left ventral medial PFC 0.215, , Left thalamus 0.123, , Right thalamus 0.088, , Right amygdala 0.152, , Left precuneus 0.151, , FC Page 9 of 11
10 Group-by-time interaction Between bilateral IPLs 0.004, , Main effect of group Between right OFC and right DM PFC 0.086, , Note. Data are 95% confidence intervals of the difference. Follow-up was performed at 1 year. DM = dorsal medial. Table E2. Shapiro-Wilk Test to Justify the Assumption of Normality of Values that Showed Significant Group-by-Time Interaction and Main Effects of Group or Time Value Statistic DF P Value. ALFF Group-by-time interaction Right inferior parietal lobule Right orbitofrontal cortex Right occipital gyrus Main effect of group Right precuneus * Right ventral medial PFC * Left ventral medial PFC <.001* Left thalamus <.001* Right thalamus * Right amygdala * Left precuneus FC Group-by-time interaction Page 10 of 11
11 Between bilateral IPLs Main effect of group Between right OFC and right DM PFC Note. Data are Shapiro-Wilk test results. DF = degree of freedom, DM = dorsal medial. * Data tested were not from a normally distributed population. Page 11 of 11
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