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Middle East Current Psychiatry
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Volumetric brain abnormalities in adolescents with conduct disorder with and without attention deficit-hyperactivity disorder: a case control study

Middle East Current Psychiatry volume 27, Article number: 14 (2020) Cite this article

Abstract

Background

Conduct disorder (CD) is a prevalent psychiatric disorder in youth with heterogeneous presentations and hazardous outcomes on family and society. Identifying potential biological markers may help in better understanding and management of the problem. This work aims to explore the potential volumetric brain abnormalities in an Arab-Egyptian sample of conduct disordered youth with and without comorbid ADHD. A total of 27 subjects with conduct disorder, 14 of which also fulfilled the criteria of ADHD, in addition to twenty healthy subjects were recruited. A validated Arabic version of the Mini International Neuropsychiatric Interview for Children and Adolescents “M.I.N.I-Kid” was carried out. MRI acquisition was performed on 1.5 T Toshiba MRI scanner. Cortical reconstruction and automatic volumetric segmentation were performed with the Freesurfer image analysis suite.

Results

Youth with CD, with and without ADHD, showed significantly lower cortical thicknesses and smaller subcortical volumes in most of the hemispheric areas. When the two patient groups were compared, youth with CD + ADHD had significantly greater cortical thicknesses but smaller subcortical volumes as compared to youth with CD only.

Conclusions

Conduct disorder, comorbid with ADHD, might prove to be a distinct phenotypic entity with different biological substrates, and hence different needed management, from CD without comorbid ADHD.

Background

Conduct disorder (CD) is a prevalent psychiatric disorder characterized by a pattern of disruptive behavior that appears prior to 18 years of age. It includes aggressive tendencies, violence, antisocial behavior, impulsivity, deception, violating the rights of the others, destruction of property, and theft [7, 39]. Such traits disrupt the child’s environment and impair his/her functioning [6]. In combination with general callousness and insensitivity to punishment, these children usually lack the ability to sympathize with others and have poor insight for the emotional impact that their behavior have on others [4, 26]. The 1-year prevalence of CD was estimated to range between 2 and 10%, with a median of 4% but incidence is known to rise in adolescence [2]. It has been reported to occur in up to 16% of otherwise normal preadolescents with higher rates in males as compared to females [38, 39]. In Egyptian adolescents, The prevalence of conduct disorder was estimated to be as high as 19.5 %, with a male to female ratio that ranges from 1.9–2.7:1 [1]. It was estimated that children with severe CD cost society 10 times more to support into adulthood than those without CD [4, 53].

Less than 50% of patients with conduct disorder grow to develop antisocial personality disorder (ASPD) [7, 26] while others develop long-term problems such as anxiety, depression, poor psychosocial functioning, school dropout, unwanted pregnancy, and criminal behavior [4, 26]. Several studies aimed at identifying biological markers that might help in the development of effective predictive, preventive, and therapeutic programs for both conduct and persistent antisocial behavior [18]. Investigated biomarkers include physiological markers [28, 29, 32, 33, 52] and electrophysiological markers [12, 30], in addition to alterations in both volumetric and functional brain imaging [45]. So far, results, especially those regarding structural brain imaging in youth with CD, have been inconsistent, with several studies showing decreased and increased grey matter volume in different parts of frontal cortex and limbic system [11, 35, 43, 45, 56]. Some other studies failed to report any significant variation in grey matter volume of any brain region in association with disruptive behavior disorders [43].

One of the main suspected causes for the inconsistency in defining potential markers of CD is the heterogeneity characterizing the CD phenotype itself [18]. Several approaches were suggested to subtype CD according to age at onset [21, 44], callous-unemotional traits [17, 19], type of aggression employed (proactive versus instrumental) [22, 23], and comorbidity, especially with ADHD [5, 25, 40]. The first two approaches were more studied and included in the Diagnostic and Statistical Manual-5 [2]. More than one approach might be incorporated in one key assumption that inherited impulsivity, one of the main symptoms of ADHD, and interacts across development with social and environmental factors to move across a spectrum that ranges from impulsive, ADHD related, aggression to instrumental aggression, and characteristic for callous-unemotional CD [5, 8, 20]. The high comorbidity between ADHD and disruptive behavior disorders (oppositional defiant disorder and conduct disorder), which ranges between 35 and 50%, might add up to the validity of this hypothesis [3, 10, 39].

A recent meta-analysis [45] reviewed twelve structural MRI studies and 17 functional MRI studies in individuals with ODD/CD. Meta-analysis, together with narrative reviews, showed evidence of smaller brain structures and lower brain activity in individuals with ODD/CD regardless of ADHD comorbidity. Reported areas included bilateral amygdala, bilateral insula, right striatum, left medial/superior frontal gyrus, and left precuneus. Another study on youths with CD showed reduced cortical thickness in the superior temporal cortex, in addition to reduced gyrification in the ventromedial frontal cortex, particularly for youths with CD without comorbid ADHD [56]. On the other hand, boys with callous–unemotional conduct problems, as compared with typically developing boys, were reported to have increased grey matter concentration in the medial orbitofrontal and anterior cingulate cortices, as well as increased grey matter volume and concentration in the temporal lobes bilaterally [11]. An inverse association was reported between hyperactive/impulsive symptoms and widespread grey matter abnormalities in the frontoparietal and temporal cortices in children with CD comorbid with ADHD [35].

Both demographic and clinical characteristics of CD are known to be affected by socio-cultural factors which vary widely across cultures and societies [2]. To our knowledge, no previous systematic studies has been done to evaluate youth with CD, ADHD, or both in Arab populations using either structural or functional brain imaging. This work aims to explore the potential volumetric brain abnormalities in an Arab-Egyptian sample of conduct disordered youth with and without comorbid ADHD during late childhood and adolescence.

Methods

This cross-sectional case-control study was carried out in the child and adolescent inpatient unit in Tanta Psychiatry and Neurology Center, Tanta University, Egypt. All subjects with conduct disorder, with and without comorbid ADHD, admitted to the inpatient unit during a time interval from October 2015 to October 2016 and were invited to participate in the study. Control subjects were recruited among those presenting to the neurology outpatient clinic in the same center for minor neurological complaints, (e.g., headache, nocturnal and enuresis) with no complaint of conduct problems or other psychiatric disorders. Subjects were excluded if they suffer from mental retardation (IQ < 70), schizophrenia, schizo affective, or significant neurological conditions that affect their collaboration with the study. Control subjects were excluded if they have any psychiatric diagnosis on the Mini International Neuropsychiatric Interview for Children and Adolescents “M.I.N. I.-Kid'” and if they have a first degree relative with oppositional defiant disorder, conduct disorder, or ADHD. Participants with contraindications to MRI were also excluded. The total number of adolescents with CD who were admitted during this time interval was 36 patients, among which 3 patients were excluded because of having IQ lower than 70 and 6 families refused to participate. A total of 27 subjects with conduct disorder, 14 of which also fulfilled the criteria of ADHD, in addition to twenty healthy subjects were recruited to participate in the study.

All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Informed consent was obtained from all individual participants included in the study. All potential hazards were explained to the participants and their families, and all participants gave their informed consent before the start of the study. The study was approved by Ethical Research Committee of Faculty of Medicine, Tanta University.

All participants were subjected to full psychiatric history and mental status examination, in addition to physical and neurological examination. Fahmy and El-Sherbini scale [14] was used to collect demographic and socio-economic data for subject and control families. The validated Arabic translation of the Stanford-Binet Intelligence quotient (IQ) fourth edition [42, 55] was used to assess the IQ of the participants to determine the general level of intelligence and to exclude subjects with intellectual disability in both patient and control groups. A validated Arabic version of the Mini International Neuropsychiatric Interview for Children and Adolescents “M.I.N.I-Kid” ([24], Sheehan, [13]) was carried out to confirm the diagnosis of CD and ADHD in subjects with one or both disorders and to exclude any psychiatric diagnoses in participating control subjects. All diagnoses were revised and confirmed by a trained child and adolescent psychiatrist.

MRI acquisition was performed on the 1.5 T Toshiba MRI scanner (Tokyo, Japan) at Tanta University Hospital. The sequence used was 3D Sagittal T1 FFE3D, with the following scan parameters: slice thickness = 1 mm, TR = 7.1 ms, TE = 2.9 ms, frequency = 256, phase = 256, FOV = 25.6 cm, flip angle = 9°, TI = 800 ms, and bandwidth = 220 Hz/pix. Two 3D T1 weighted images were acquired for each subject for motion correction purposes. Cortical reconstruction and automatic volumetric segmentation were performed with the Freesurfer image analysis suite, version 6.0 (Fig. 1), which is documented and freely available for download online (http://surfer.nmr.mgh.harvard.edu/). Briefly, this processing includes motion correction and averaging of multiple volumetric T1 weighted images, removal of non-brain tissue using a hybrid watershed/surface deformation procedure, automated Talairach transformation, segmentation of the subcortical white matter, and deep grey matter volumetric structures (including hippocampus, amygdala, caudate, putamen, ventricles). This method uses both intensity and continuity information from the entire three-dimensional MR volumes in segmentation and deformation procedures to produce representations of cortical thickness, calculated as the closest distance from the grey/white boundary to the grey/CSF boundary at each vertex on the tessellated surface. The maps are created using spatial intensity gradients across tissue classes and are therefore not simply reliant on absolute signal intensity. The maps produced are not restricted to the voxel resolution of the original data thus are capable of detecting submillimeter differences between groups [49].

Fig. 1
figure 1

Brain segmentation.a Lateral view. b Medial view. c Inferior view

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Monte Carlo method for simulation and correction for multiple comparisons was utilized. In order to correct for multiple comparisons, this method depends on performing simulations under the null hypothesis and see how often the value of a statistic from the “true” analysis is exceeded. This frequency is then interpreted as a p value and corrected for multiple comparisons. This is especially useful with surface-based data as traditional random field theory is harder to implement. This simulator is roughly based on FSLs permutation simulator (randomize) and AFNIs null-z simulator (AlphaSim). Note that FreeSurfer also offers false discovery rate (FDR) correction in tkmedit and tksurfer.

Between-group demographic and clinical characteristics were compared using chi-square, independent t test, one-way ANOVA, and non-parametric analogues (Mann-Whitney and Fisher’s exact tests) as appropriate. All p values were based on two-tailed tests with a = 0.05. Bonferroni correction was performed as a post-hoc test to evaluate the differences between groups after ANOVA tests. IBM SPSS (Statistical Package for the Social Sciences)-version 19 was used to carry out all analyses.

Results

A total of 27 subjects with conduct disorder, 14 of which also fulfilled the criteria of ADHD, in addition to twenty healthy subjects were recruited. The sample included 17 female and 30 male subjects. All subjects were 10–18 years old (mean 13.7 ± 2.5). The three groups were matched with no significant differences between groups regarding age, sex, socio-economic status, or IQ (Table 1, p ≥ 0.05).

Table 1 Comparison between adolescents with conduct disorder with and without ADHD together with control adolescents regarding demographic data, socio-economic status, and IQ
Full size table

First, thickness of frontal cortices in the right hemisphere in the three groups of subjects was calculated (Table 2, Figs. 2, 3, and 4). Apart from the anterior cingulate gyrus which showed no significant differences between the three groups, the CD only group showed significant reduction in thickness of all estimated frontal areas as compared to the control group. Right hemispheric cortical thicknesses in the control group generally had the greater thicknesses followed by the comorbid (CD + ADHD) group and finally, the CD only group which showed the least thicknesses in most of the right hemispheric cortical areas. Relatively few areas, e.g., precentral area, lateral orbitofrontal, precentral, and lateral occipital cortices showed significant differences between the two patient groups (i.e., the CD only and the CD + ADHD groups).

Table 2 Comparison between adolescents with conduct disorder, with and without ADHD, and control adolescents regarding right hemispheric cortical thickness (mm)
Full size table
Fig. 2
figure 2

Brain surface demonstrating significant differences between youth with conduct disorder (CD only) versus healthy control youth. a Left lateral. b Left medial. c Right lateral. d Right medial

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Fig. 3
figure 3

Brain surface demonstrating significant differences between youth with conduct disorder comorbid with attention deficit-hyperactivity disorder (CD + ADHD) versus healthy control youth. a Left lateral. b Left medial. c Right lateral. d Right medial

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Fig. 4
figure 4

Brain surface demonstrating significant differences between youth with conduct disorder (CD only) versus those with conduct disorder comorbid with attention deficit-hyperactivity disorder (CD + ADHD). a Left lateral. b Left medial. c Right lateral. d right medial

Full size image

Left hemispheres did not show a different pattern (Table 3, Figs. 2, 3, and 4). Frontal areas also showed lower thickness in CD only, but not in CD + ADHD, as compared to control group except for the orbitofrontal areas which showed lower thickness in both patient groups as compared to the control group. Thickness in most areas also showed a sloping hierarchy in which control youth had the greatest cortical thicknesses and CD only youth had the lesser ones with the CD + ADHD group in between. The only exception here was caudal middle frontal cortex which showed no significant difference between the three groups. Some other areas showed significant differences between the three groups while other areas showed non-significant differences between the CD + ADHD and the control group, e.g., precentral cortex or the CD only group, e.g., superior temporal and lateral occipital cortices. Another exception from the role of (control ≥ CD + ADHD ≥ CD only) was manifested in the left insula and anterior cingulate cortex which showed a non-significant difference in thickness favoring the CD only group. Mean cortical thickness in both hemispheres showed significant differences between the three groups with greater thickness in control subjects and lesser thickness in CD only group. The frontal pole and superior frontal cortex in the CD + ADHD group did not show any significant difference with any of the two other groups.

Table 3 Comparison between adolescents with conduct disorder, with and without ADHD, and control adolescents regarding left hemispheric cortical thickness (mm)
Full size table

The estimation of the volumes of the subcortical structures did show a quite different pattern (Table 4, Figs. 2, 3, and 4). Most of the other structures showed smaller volumes in CD only group as compared to control groups but even smaller volumes in the comorbid (CD + ADHD) group (control ≥ CD only ≥ CD + ADHD) with no significant difference between the two patient groups in both amygdale, right hippocampus, or bilateral cerebellar grey, and white matter. The difference between the two patient groups was only significant in left hippocampus which showed lower volume in CD + ADHD group when compared to CD only group. Striatal structures did not generally show significant differences between the three groups on both sides except for the left putamen which showed a greater volume in control which proved significant when compared to CD only and insignificant when compared to CD + ADHD group.

Table 4 Comparison between adolescents with conduct disorder, with and without ADHD, and control adolescents regarding subcortical volumes (cm3)
Full size table

Discussion

When compared to healthy controls, youth with CD, with and without comorbid ADHD, most of the brain areas in the former group showed significantly lower cortical thicknesses and smaller subcortical volumes in comparison to the corresponding areas in the two patient groups except for superior and middle frontal areas which did not show significant differences between the comorbid and the control group. When the two latter groups were compared to each other, youth with CD + ADHD had significantly greater cortical thicknesses but smaller subcortical volumes as compared to youth with CD only. Differences between CD + ADHD and control groups were less consistent in prefrontal areas, especially in the right hemisphere. Another prominent exception was striatal structure which did not show significant differences between the three groups except a weakly significant difference in the left pallidum.

Before further discussing the results, it is important to highlight the limitations of this study. First, the sample was recruited through an inpatient child psychiatry program, which usually includes severely ill youth. Therefore, the results may not be generalizable to other populations. Second, any influence of any given medication on the results cannot be ruled out. Third, the effect of comorbid disorders, other than ADHD, on estimated variables, cannot be ruled out in both patient groups. Finally, the relatively small number of subjects and using only structural, not functional, imaging techniques both decrease the significance of the current study.

Early studies who performed structural MRI in samples of youth with CD comorbid with ADHD used relatively older imaging techniques and reported few differences between the patient and control groups and almost no difference between comorbid ADHD and CD with any of the two disorders alone [9, 37]. A relatively recent study replicated the same results with the exception of greater volume deficits in ADHD comorbid with disruptive disorders as compared to ADHD alone [41]. Another study indicated significantly smaller regional grey matter volumes in more extensive regions of the brains of youth with ADHD after controlling for the confounding effect of comorbid ODD and CD [51]. The most recent study which used structural imaging technique to assess youth with ODD and/or CD reported reduced grey matter volumes in temporal regions, particularly in girls but did not replicate previous findings of reduced grey matter volumes in the anterior insula, amygdala, and frontal cortex in youth with CD [43].

The reduction in both cortical and subcortical thickness in our sample of CD only youth is generally more profound and manifest than that previously reported in similar structural MRI studies [9, 13, 15, 16, 24, 34, 36, 42, 43]. This difference might be explained by the different inclusion criteria for recruited subjects in our sample. The above cited studies included youth with both oppositional defiant disorder (ODD) and CD. The mix of the two disorders most probably have produced a much milder form of disruptive behavior as compared to our sample which included only youth with CD, mostly sever enough to be admitted to a child psychiatric inpatient unit.

With few exceptions, our results present a further support to the results reported by the recent meta-analysis performed by Noordermeer and colleagues [45]. Youth with CD in our sample showed lower cortical thicknesses and smaller volumes in some areas responsible for the so called “hot” executive functioning and reported to show smaller volumes in youth with disruptive behavior disorders regardless of comorbidity with ADHD in the cited meta-analysis, namely left precuneus, bilateral amygdale, and bilateral insula. Our results did not replicate the lower striatal volume reported in that meta-analysis but reported decreased cortical thickness in bilateral orbitofrontal gyri, another area that was also linked to hot executive functions [47, 50] but not found to be affected in the cited meta-analysis. On the other hand, Our results disagreed with the results of the meta-analysis regarding the affection of the main centers for “cool” executive functioning [47, 50], namely prefrontal cortex, cerebellar grey, and white matter, which were not judged to be affected in the meta-analysis. The prefrontal cortices did show reduction in thickness in CD only youth but normal thickness in the CD + ADHD comorbid group while the cerebellar grey and white matter did show reduction in volumes in the two patient groups without significant differences between them. These disagreements might also be explained by the small number and sever CD symptoms in our inpatient group. The collective sample of the meta-analysis which includes youth with ODD and CD with and without comorbid ADHD might be too diluted to detect the volumetric changes in prefrontal cortices present in CD only and not in comorbid youth.

In general, most of the brain areas showed volumetric reduction in our sample of severely ill conduct disordered youth but some of these areas, especially prefrontal cortices, might be spared in youth with both CD and ADHD. Given that the prefrontal cortices are known to be the main site of action for stimulant medications [27, 54], the well-known better response of the CD + ADHD youth on these medications as compared to the CD only youth [48, 51] may be considered as another support for that hypothesis. These results might be contradictory to the old notion that CD + ADHD youth are more aggressive and more likely to develop an adult type antisocial personality when compared to CD only youth [22, 40, 46]. However, other studies, especially those exploring the electrophysiological differences such as skin conductance and heart rate, indicated no differences between CD + ADHD and CD only youth [29,30,31, 58]. The only exception came from a study reporting that CD + ADHD boys showed greater HR acceleration following low provocation, but not high provocation, compared to CD only [57]. These contradicting results indicate the need for more studies aiming to understand CD subtypes based on ADHD symptoms and whether these subtypes represent homogeneous or heterogeneous groups of children [18].

Conclusion

In conclusion, our results support the notion that CD without comorbid ADHD might represent a severer form of the disorder than that associated with comorbid ADHD. Further studies are needed to evaluate the structural and functional alterations in the brains of conduct disordered youth and to explore the potential biological markers that might differentiate between CD only and CD + ADHD youth.

Availability of data and materials

The dataset created and analyzed during the current study will be uploaded with manuscript in excel file format and will be available from the corresponding author on reasonable request.

Abbreviations

CD:

Conduct disorder

ADHD:

Attention deficit-hyperactivity disorder

M.I.N.I-Kid:

Mini International Neuropsychiatric Interview for Children and Adolescents

MRI:

Magnetic resonance imaging

ASPD:

Antisocial personality disorder

EF:

Executive functioning

ODD:

Oppositional defiant disorder

IQ:

Intelligent quotient

T1:

Longitudinal relaxation time 1

T2:

Longitudinal relaxation time 2

FFE3D:

Fast field echo 3 dimensional

TR:

Repetition time

TE:

Echo time

TI:

Inversion time

FOV:

field of view

CSF:

Cerebrospinal fluid

FMRIB:

Functional magnetic resonance imaging of the brain

FSL:

FMRIB software library

AFNI:

Analysis of functional neuroimages

FDR:

False discovery rate

ANOVA:

Analysis of variance

IBM:

International Business Machines

SPSS:

Statistical Package for the Social Sciences

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Acknowledgements

We would like to express our deep appreciation to Boris Birmaher, MD, Endowed Chair in Early Onset Bipolar Disease and Professor of Psychiatry, University of Pittsburgh, USA, for his revision and advice in writing this paper. Many thanks to Ahmed El-Zawawy, clinical psychologist, who did the psychometric evaluation for the recruited adolescents and to Maha and Marwa Salah, the two sister social workers for doing the socio-economic evaluation for participating families. Thanks are due also for the whole nursing and technician teams in the Child and Adolescent Psychiatry unit at Tanta Psychiatry and Neurology Center and the Department of Radiology in Tanta University Educational Hospital and for all participating families. This study was self-funded by the 1st and the 2nd authors who paid the costs of imaging out of pocket. Subjects were willing to participate without any monetary compensation. All other authors declare no conflict of interest.

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Funding

This study was self-funded. No funds were received.

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Authors and Affiliations

  1. Department of Psychiatry and Neurology, Faculty of Medicine, Tanta University, Elgiesh street, Tanta, 31527, Egypt

    Mohammad A. Seleem

  2. Department of Radiology, Faculty of Medicine, Tanta University, Elgiesh street, Tanta, 31527, Egypt

    Rasha El-Shafey

  3. Tanta University Hospital, Elgiesh street, Tanta, 31527, Egypt

    Lamis T. Shahin, Lina E. Abdel-Aziz, Noura M. Elkonaisy, Yomna K. Marey, Mina Rizkallah & Michael Baghdadi

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  1. Mohammad A. Seleem
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Contributions

MS was responsible for the research idea and study design, choosing and confirming the diagnoses of the recruited subjects, and writing the manuscript. RE was responsible for supervising the process of brain imaging and writing the imaging parts of the manuscript. LS, LA, NE, and YM were responsible for preparing the protocol and requirements for ethical board approval and applying the psychometric tools. MR and MB were responsible for performing the statistical analysis using volumetric software. all authors have read and approved the manuscript for publication.

Corresponding author

Correspondence to Mohammad A. Seleem.

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Ethics approval and consent to participate

The study was approved by the Ethical Research Committee (ERC) of the Faculty of Medicine, Tanta University under the code 30383/06/15. All participants of the study gave their written consent to participate in the study.

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The authors declare that they have no competing interests.

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Seleem, M.A., El-Shafey, R., Shahin, L.T. et al. Volumetric brain abnormalities in adolescents with conduct disorder with and without attention deficit-hyperactivity disorder: a case control study. Middle East Curr Psychiatry 27, 14 (2020). https://doi.org/10.1186/s43045-020-00025-0

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