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The effect of second-generation
antipsychotics on hippocampal
volume in first episode of
psychosis: longitudinal study
Michael Bodnar, Ashok K. Malla, Carolina Makowski, M.
Mallar Chakravarty, Ridha Joober, Martin Lepage
British Journal of Psychiatry Open Mar 2016, 2 (2) 139-146
Presenter- Kapil Kulkarni
Guided by – Dr. Basavaraja Papanna , Consultant Psychiatrist, Herrick
House, NEP NHS Trust, Colchester, UK
Background
• Most consistent neuroimaging findings in Schizophrenia and related
psychosis is marked decrease in –
1. Whole-brain volume
2. Whole-brain grey matter
3. Frontal grey and white matter
• One study- Reduced grey matter hippocampus- poorer outcome
• Identifying a protective molecule-can alter the course of treatment and
outcome.
• A recent meta-analysis- clozapine leads to less evident loss and, in some
cases, actually increased whole-brain gray matter.
• Aripiprazole- improved memory performance in schizophrenia. But any
positive structural brain alterations, particularly in the hippocampus is
uncertain.
This study…
• Compared hippocampal grey matter changes over 1-year period in people
with a first episode of psychosis (FEP) taking aripiprazole with those taking
other second-generation antipsychotics and with non-clinical controls.
• Hypothesis- Patient taking aripiprazole would show an increase in
hippocampal volume.
This study…
• At Douglas Mental Health University Institute in Montreal, Canada.
• Approved by the Research Ethics Board of the Douglas Mental Health
University Institute and the McGill University Faculty of Medicine.
• Patients admitted and treated at PEPP between January 2004 and June
2014
• PEPP is a specialized early intervention service at the Douglas Mental Health University Institute in
Montreal, Canada. It serves 14- to 35-year-olds with a diagnosis of affective or non-affective psychosis who
have had no more than 1 month of previous antipsychotic treatment; without organic brain damage, a
pervasive developmental disorder, an IQ below 70, or epilepsy; and do not have substance-induced
psychosis.
Methods
Participants
• Eligibility-
1. Individuals admitted and treated at the Prevention and Early
Intervention Program for Psychoses (PEPP)
2. Aged 18–30 years
3. No history of neurological disease or head trauma causing loss of
consciousness
• Diagnoses-
1. SCID
2. Validated through consensus with a staff research psychiatrist
• A control group- Recruited through advertisements in local newspapers
• Exclusion criteria-
1. Individual with current or past history of any Axis I disorder, any neurological disease, head trauma
causing loss of consciousness
2. First-degree relative diagnosed with schizophrenia or a related spectrum disorder.
• Consent- written informed consent from all participants.
Methods
Participants
• Treatment of FEP in PEPP-
1. A comprehensive approach- Pharmacotherapy + Psychological therapies
2. Pharmacotherapy for all patients- with a second-generation
antipsychotic (olanzapine, risperidone, paliperidone, quetiapine or
aripiprazole).
3. If no optimal response within 4–6 weeks or significant side effects
emerge- change to a different antipsychotic
4. Patients who refuse pharmacotherapy- psychosocial interventions
Methods
Treatment settings
Methods
Clinical and sociodemographic data
• Clinical data were collected near entry and at months 1, 2, 3, 6, 9, 12 and
18
• Data obtained at baseline-
1. Education level (years completed)
2. Parental socioeconomic status
3. Handedness
4. Duration of untreated psychosis (DUP)
5. Duration of untreated illness (DUI)
6. Full-scale IQ
• Type and dosage of antipsychotic prescribed- Noted at each assessment
and converted into chlorpromazine equivalents.
• Changes in total positive (SAPS) and negative symptoms (SANS) over the
period of time were noted.
• Evaluators, who are not involved in patient treatment, have established inter-class correlations of 0.89 and
0.71 on the SAPS and SANS respectively
• Percentage of time spent in positive symptom remission during the
interscan interval was also calculated. (positive remission was defined as mild or less on all
four global scores of the SAPS).
Methods
Clinical and sociodemographic data
Methods
Longitudinal Structural MRI data
acquisition and processing
• Scanning- At the Montreal Neurological Institute
• For each participant, T1 MR images were acquired using a 3D gradient-
echopulse sequence
• Scan 1 – Baseline
• Scan 2 – After 1 year
• Same scanner and parameters were used at both Scan 1 and Scan 2
• 88 people with FEP and 46 controls completed both scans
• Whole hippocampal volume- FreeSurfer v5.3
• T1 images were automatically processed in using the hippocampal-subfields and longitudinal streams.
• Whole hippocampal volume- MAGeT-Brain (Multiple Automatically
Generated Templates) algorithm.
• The T1 images were reprocessed using an independent pipeline, the, based on subfield definitions derived
from the Chakravarty Laboratory
• Hippocampal volumes derived from MAGeT-Brain were found to strongly
overlap with those derived using FreeSurfer.
Methods
Longitudinal Structural MRI data
acquisition and processing
• Subfield volumes derived from each technique were summed to obtain
left- and right-side hippocampal volumes
• Scan 1 volumes were subtracted from Scan 2 volumes to see change over
time
• Finally, total intracranial volume (TIV) was estimated using FreeSurfer for
patients and controls.
Methods
Longitudinal Structural MRI data
acquisition and processing
Methods
Antipsychotic treatment subgroups
• Subgroups of patients done based on the type of antipsychotic taken
during the interscan interval.
• To be considered for a subgroup, a patient had to take one type of an
antipsychotic for a minimum of 6 consecutive months with an average
adherence above 50%.
• The chosen time period of 6 months- justified by a seminal paper written by Lieberman and colleagues-
median discontinuation for antipsychotics was around the 6-month period, confirmed by an independent
trial
• Medication adherence protocol - Validated protocol based on composite information from Patient Family
members Treating team. This has been shown to be as efficacious as pill-counting
0=never (0%)
1=very infrequently (1–25%)
2=sometimes (26–50%)
3=quite often (51–75%)
4=fully (76–100%)
• Patients who refused antipsychotic treatment or had less than 50%
adherence (score of 2 or less) were categorised into the ‘refused-
antipsychotics (APs)’ subgroup.
Methods
Antipsychotic treatment subgroups
Methods
Sample size
• Of the 88 people with FEP with two MRI scans, 26 were removed
due to:
1. Missing key clinical data (n=1)
2. Technical/processing errors (n=1)
3. Concurrent antidepressant use (n=5)
4. Polypharmacy of antipsychotics (n=9)
5. Insufficiently sized subgroups (n=10) Those taking quetiapine (n=5), ziprasidone (n=3), haloperidol (n=1)
and asenapine (n=1) were excluded as any results would have been uninterpretable due to small
subgroup sizes.
• Two controls were also removed due to processing errors
• The final sample size- 62 people with FEP and 44 controls
• Final FEP subgroups included(n=62):
1. Risperidone/paliperidone (n=24) Paliperidone is the active metabolite of risperidone and has been
shown to have a similar efficacy and treatment profile
2. Olanzapine (n=12)
3. Aripiprazole (n=13)
4. Refused-APs (n=13)
• Final Controls (n=44)
Methods
Final Antipsychotic subgroups
• All analyses were performed by using SPSS 22 and were two-tailed with a
critical P-value of 0.05, except where noted.
Methods
Statistical Analyses
• Sample characteristics were analysed by using
1. One-way ANOVAs - Continuous variables
2. Kruskall–Wallis H-tests- Nominal variables
3. Median tests- DUP and DUI
Methods
Statistical Analyses
Methods
Statistical Analyses
• Hippocampal volumes from FreeSurfer and MAGeT-Brain analysis-
Repeated measure ANOVA
1. ‘Group’ as the between-group factor- (risperidone/paliperidone, olanzapine, aripiprazole, refused-APs,
controls)
2. ‘Side’ as the within-group factor
(left, right)
• Analyses were one-tailed and included the following covariates:
1. Age at Scan 1
2. Age at Scan 2
3. Education
4. Gender
5. Handedness
6. Overall antipsychotic dosage per month
7. TIV
• SAPS and SANS totals (at baseline, month 6, month 12, month 18) were
analysed- Generalised estimating equations (GEEs)
• (significant P-value was set to 0.012) (0.05/4 time points)
• GEE is a multivariate extension of the generalised linear model to analyse
repeated measurements or other correlated observations.
• Advantages of GEE:
1. Examining a large, longitudinal data-set
2. Accommodate violations of normality (homogeneity of variance)
3. Accommodate incomplete data based on population quantities and data distributions (allows the
exclusion of a single missing observation without having to exclude an entire subject)
Methods
Statistical Analyses
Results
Sample Characteristics
• For all participants, there were no significant between-group differences in
age at Scan 1, age at Scan 2, parental socioeconomic status, gender,
handedness, full-scale IQ, interscan interval or TIV; however, there were
significant differences regarding education, with controls completing the
most years.
• Among the FEP subgroups, there were no significant differences in the age
at onset of psychosis, diagnosis, time from PEPP entry to Scan 1, DUP, DUI
or antipsychotic dosage prescribed; however, there were significant
differences regarding time spent on antipsychotic and overall medication
adherence.
• As expected, the refused-APs subgroup spent the lowest time taking the
prescribed antipsychotic (average of 3.4 v. 11.9 months for the other three
subgroups) and had the lowest adherence (average of 35% v. 88% for the
other three subgroups). See Tables 1 and 2 for data and results.
Variable Risperid
one/pali
peridone
(n=24)
Olanzapine
(n=12)
Aripiprazole
(n=13)
Refused
-APs
(n=13)
Controls
(n=44)
Statistic d.f. P
Age at
onset,
years:
mean (s.d.)
22.5
(3.5)
22.3 (3.2) 23.3 (4.1) 24.3
(3.1)
– F=0.94 3.57 0.429
Parental
SES,
mean
(s.d.)a
3.3 (1.1) 3.0 (1.1) 2.9 (0.8) 3.1 (0.9) 3.3 (0.8) χ2=4.45 4 0.348
Educatio
n, mean
(s.d.)b
11.1
(2.4)
12.7 (2.3) 12.5 (2.0) 12.7
(2.4)
14.3 (2.5) F=7.22 4.101 <0.001
Full-scale
IQ, mean
(s.d.) [n]
96.5
(14.6)
100.8 (16.5) 105.5 (13.9) 105.5
(12.5)
111.1
(14.6) [42]
F=3.05 4.95 0.233
Table 1 General sample characteristics
APs, antipsychotics; DUP, duration of untreated psychosis; DUI, duration of untreated illness; SES, socioeconomic status.
↵a Hollingshead parental SES: 1=high SES and 5=low SES.
↵b Number of school years completed. Controls>all subgroups (all P<0.042).
↵c Final diagnosis obtained after 1 year of treatment, not initial diagnosis at entry.
Variable Risperidon
e/paliperid
one (n=24)
Olanzapine
(n=12)
Aripiprazole
(n=13)
Refused-
APs
(n=13)
Controls
(n=44)
Statistic d.f. P
Right
handed, n
(%)
17 (70.8) 10 (83.3) 12 (92.3) 9 (69.2) 38 (86.4) χ2=4.75 4 0.314
Male,n (%) 18 (75.0) 6 (50.0) 10 (76.9) 9 (69.2) 26 (59.1) χ2=3.84 4 0.429
Non-
affective
disorder, n
(%)c
23 (95.8) 8 (66.7) 10 (76.9) 10 (76.9) – χ2=5.54 3 0.136
DUP,
weeks:
median [n]
18.6 [23] 17.8 12.8 [10] 20.6 [11] – χ2=2.08 3 0.556
DUI,
weeks:
median [n]
394.6 200.9 207.4 [9] 255.3 [11] – χ2=5.87 3 0.118
Table 1 General sample characteristics
APs, antipsychotics; DUP, duration of untreated psychosis; DUI, duration of untreated illness; SES, socioeconomic status.
↵a Hollingshead parental SES: 1=high SES and 5=low SES.
↵b Number of school years completed. Controls>all subgroups (all P<0.042).
↵c Final diagnosis obtained after 1 year of treatment, not initial diagnosis at entry.
Variable Risperidone
/paliperidon
e (n=24)
Olanzapine
(n=12)
Aripiprazole
(n=13)
Refused-
APs (n=13)
Controls
(n=44)
Statistic d.f. P
Age at Scan
1, years: mean
(s.d.)
23.7 (3.6) 23.4 (3.3) 23.5 (4.2) 25.9 (3.1) 23.9 (3.4) F=1.15 4.101 0.336
Age at Scan
2, years: mean
(s.d.)
24.9 (3.6) 24.5 (3.3) 24.6 (4.2) 27.0 (3.1) 24.9 (3.4) F=1.15 4.101 0.339
From entry to
Scan 1,
months: mean
(s.d.)
4.2 (2.0) 3.9 (2.3) 4.4 (1.7) 3.8 (1.4) – F=0.30 3.58 0.826
Interscan
interval,
months: mean
(s.d.)
13.7 (1.4) 13.0 (1.3) 12.6 (1.3) 13.0 (1.4) 12.8 (1.3) F=2.44 4.101 0.052
Time spent
on
antipsychotic,
months: mean
(s.d.)a
11.6 (2.9) 12.1 (1.9) 12.1 (1.0) 3.4 (3.2) – F=39.01 3.58 <0.001
• Table 2: Sample characteristics related to neuroimaging data and interscan interval
• APs, antipsychotics; CPZ, chlorpromazine; SAPS, Scale for the Assessment of Positive Symptoms; SANS, Scale for the Assessment of
Negative Symptoms.
• ↵a Number of months that antipsychotic was taken for during interscan interval. Refusal<all subgroups (all P<0.001).
• ↵b Average prescribed dosage in CPZ equivalents (mg/day) per month during interscan interval.
• ↵c Average overall medication adherence during interscan interval. Refusal<all subgroups (all P<0.001).
• ↵d Percentage of time spent in positive symptom remission during interscan interval.
• ↵e Change in symptom totals during interscan interval; a negative value indicates a decrease in total (improvement) from Scan 1 to Scan
2.
Variable Risperidone/
paliperidone
(n=24)
Olanzapine
(n=12)
Aripiprazole
(n=13)
Refused-APs
(n=13)
Controls
(n=44)
Statistic d.f. P
CPZ/month, mean
(s.d.)b
154.6 (103.8) 172.8 (97.4) 150.3 (103.0) 70.8 (96.3) – F=2.67 3.58 0.056
Adherence, %:
mean (s.d.)c
83.3 (18.7) 91.8 (16.0) 89.2 (16.2) 35.1 (35.6) – F=18.71 3.58 <0.001
Time in
remission, %:
mean (s.d.)d
70.6 (33.5) 67.9 (38.2) 73.9 (35.1) 66.1 (39.1) – F=0.12 3.58 0.950
Change in SAPS
total, mean (s.d.)e
0.38 (9.86) 1.75 (17.60) –0.85 (7.14) 2.15 (10.62) – F=0.19 3.58 0.904
Change in SANS
total, mean (s.d.)e
–0.50 (15.08) –2.17 (4.57) –8.00 (15.32) –3.46 (14.26) – F=0.88 3.58 0.458
Intracranial
volume, cm3:
mean (s.d.)
1705 (135) 1679 (177) 1758 (163) 1683 (188) 1697
(176)
F=0.47 4.101 0.760
• Over the interscan interval, there were no significant subgroup differences
in the change of positive symptom totals (SAPS) and negative symptom
totals (SANS) (Table 2).
• In addition, there were no significant subgroup differences in the amount
of time spent in positive symptom remission (Table 2).
Results
Symptom total (SAPS/SANS) changes and
remission
• For SAPS total, there was a significant main effect of ‘time’ (Wald χ2=188.24,
df=3, P<0.001) (Fig. 1).
• All patients with FEP displayed a significant decrease from baseline to
month 6 (P<0.001) with no changes thereafter (all P’s>0.273).
• For SANS total, there was a significant main effect of ‘time’ (Wald χ2=27.39,
df=3, P<0.001) and of ‘group’ (Wald χ2=11.14, df=3, P=0.011) (Fig. 1).
• All patients with FEP displayed a significant decrease from baseline to
month 6 (P<0.001) with minimal changes thereafter (all P’s>0.102).
• The risperidone/paliperidone subgroup had a higher total overall
compared with the other three subgroups (all P’s<0.041); no other subgroup
differences were apparent (all P’s>0.354).
Results
Symptom total (SAPS/SANS) changes and
remission
Fig. 1
Positive and negative symptom totals among first-episode psychosis (FEP) subgroups.
The error bars represent standard error. All people with FEP showed a significant
improvement in both measures over the first 6 months of treatment. The
risperidone/paliperidone (Risp/Palp) subgroup had higher negative symptoms overall
compared with the other three subgroups.
SAPS, Scale for the Assessment of Positive Symptoms; SANS, Scale for the Assessment of Negative Symptoms; Olanz,
Results
Hippocampal Volume change
• For FreeSurfer, the repeated-measures
ANCOVA revealed a significant between-group
effect (F=2.88, P=0.014).
• Aripiprazole subgroup had a significantly
larger increase in total bilateral volume
compared with the risperidone/paliperidone
subgroup (P=0.008, Cohen’s d=0.92), the
olanzapine subgroup (P=0.005, Cohen’s d=1.38),
the refused-APs subgroup (P=0.005, Cohen’s
d=1.30) and the controls (P=0.002, Cohen’s d=1.20).
Fig. 2
Change in grey matter volume in the hippocampus for first-episode psychosis (FEP) subgroups and
controls.
The error bars represent standard error. The aripiprazole subgroup displayed a significantly larger
change in bilateral hippocampal volume compared with all FEP subgroups and controls for
volumes derived from both FreeSurfer and MAGeT-Brain.
Risp/Palip, risperidone/paliperidone; Olanz, olanzapine; APs, antipsychotics.
Results
Correlations involving changes over
interscan interval
• No significant correlations between hippocampal volume change and SAPS
and SANS total changes (Table 3).
• Exploring only within the aripiprazole subgroup (n=13), bivariate
correlations were also not significant:
 between SAPS total change and hippocampal volume change for
FreeSurfer volumes (r=0.376, P=0.206) or for MAGeT-Brain volumes (r=0.291,
P=0.334)
 between SANS total change and hippocampal volume change for
FreeSurfer volumes (r=–0.260, P=0.391) or for MAGeT-Brain volumes (r=–0.203,
P=0.506)
 or between total antipsychotic dosage and hippocampal volume change
for FreeSurfer volumes (r=–0.315, P=0.294) or for MAGeT-Brain volumes (r=–0.236,
P=0.268)
Results
Correlation at scan1 and scan 2
• Partial correlations, controlling for subgroup, between SAPS total
and hippocampal volumes at both Scan 1 and at Scan 2 revealed no
significant associations for FreeSurfer volumes (all Ps>0.467) or for
MAGeT-Brain volumes (all P’s>0.643).
• At Scan 1 partial correlations with SANS total revealed significant
negative associations with right (r=–0.286, P=0.025) and total (r=–0.267,
P=0.037) FreeSurfer volumes; but there were no significant
correlations found for the MAGeT-Brain volumes (all P’s>0.175).
• At Scan 2, there were no significant correlations between SANS
total and hippocampal volumes for either FreeSurfer volumes (all
P’s>0.420) or for MAGeT-Brain volumes (all P’s>0.818) (supplementary
Table DS2)
Discussion
• This study observed- People with FEP taking aripiprazole displayed a
significant increase in bilateral hippocampal volume over a 1-year follow-
up period
• This finding was obtained from two independent neuroimaging pipelines
FreeSurfer v5.3 and MAGeT-Brain.
• Aripiprazole is as effective as other antipsychotics with respect SAPS and
SANS reduction, and time spent in remission.
• So aripiprazole may be a good treatment option with an added benefit of
enhanced hippocampal plasticity and increasing volume which may affect
future clinical status.
Discussion
Aripiprazole and augmenting hippocampal
growth
• Adult human brain is capable of neurogenesis from neural stem cells, but
this growth is limited to the hippocampus.
• This phenomenon attracted more attention recently as it may play role in
hippocampal-dependent learning and memory.
• So hippocampal growth is possible if correct pathways are triggered.
• Aripiprazole- a dopamine/serotonin system stabilizer.
• Its partial agonist to D2, 5HT1A and 5HT7 receptors and antagonist at D1,
5HT2A and 5HT6 receptors.
• Aripiprazole in animals models of depression and schizophrenia-
i. Better memory function
ii. Increased dopamine
iii. Brain-derived neurotrophic factor (BDNF) in hippocampus.
• Mouse model involving neuronal loss in the dentate gyrus- Aripiprazole
increased proliferation of newly generated neurons
• In humans, people with schizophrenia- improved memory function with
aripiprazole treatment.
Discussion
Aripiprazole and augmenting hippocampal
growth
• A functional MRI study in people with schizophrenia using aripiprazole-
improved working memory.
• All above findings- aripiprazole may be related to an overall improvement
of memory function as well as inducing neuroanatomical alterations in
memory system structures, especially hippocampus.
Discussion
Aripiprazole and augmenting hippocampal
growth
• Exact mechanisms is unclear- but probably 5-HT1A agonism may help to
induce adult neurogenesis.
(Antipsychotics with 5-HT1A agonism include aripiprazole, ziprasidone, clozapine, asenapine
and Lurasidone)
• One study showed that people with reduced BDNF secretion- displayed
poorer memory performance along with abnormal hippocampal
functioning.
• Interestingly, aripiprazole has been shown to enhance BDNF levels.
Discussion
Aripiprazole and augmenting hippocampal
growth
• Taken together, BDNF secretion and 5-HT1A agonistic action of
aripiprazole, could favourably enhance adult neurogenesis in the
hippocampus.
• Future studies are warranted to explore the underlying mechanisms of
adult neurogenesis with aripiprazole.
Discussion
Aripiprazole and augmenting hippocampal
growth
Discussion
Symptomatic changes in relation to
hippocampal volume change
• This study- changes in hippocampal volume over the interscan interval did
not significantly correlate with changes in either positive or negative
symptoms or with the total amount of antipsychotics taken (in
chlorpromazine equivalents).
• This suggests that the change in hippocampal volume with aripiprazole,
was not an effect related to symptomatic change over time or to the
amount of medication taken.
• So this claim should be verified in a future controlled study.
• Moreover, this study found no relationship between positive symptoms
and hippocampal volumes at Scan 1 or at Scan 2 using both FreeSurfer and
MAGeT-Brain.
• However, this study did find a negative correlation between right
hippocampal volume and negative symptoms total at Scan 1, using
FreeSurfer volumes only.
Discussion
Symptomatic changes in relation to
hippocampal volume change
Discussion
Symptomatic changes in relation to
hippocampal volume change
• These findings are noteworthy, as previous studies using FreeSurfer have
noted significant correlations with both positive and negative symptoms in
hippocampal subfield analyses.
• For the positive symptoms, one study found these associations particular to the CA1 and CA2/3 subfields,
another study found the associations particular to presubiculum and sublicuum subfields and the final
study found no such relationship with hippocampal volumes.
• Of note, the study by Mathew et al explored hippocampal volumes in 886 participants across a six-site
collaboration and noted an intersite scanning variation that was controlled for using a covariate.
• Although the power was evident in this study with such a large sample size, results may have been
confounded by the varying scanners that were employed.
• An interesting suggestion would be to re-analyse their data using another
pipeline such as MAGeT-Brain to help identify whether the issue was with
FreeSurfer itself.
• Finally, this results suggested that smaller hippocampal volumes at Scan 1
were related to worse negative symptoms, a finding supported by Kawano
et al.
• In fact, this group showed the relationship was specific with CA2/3 and CA4/dentate gyrus subfield
volumes.
• Although we did not explore subfield volumes, it would appear there are specific subfields that may
be related to symptomology.
• As such, we further suggest that any future study exploring the
relationship between aripiprazole and hippocampal growth should explore
for changes within the subfields.
Discussion
Symptomatic changes in relation to
hippocampal volume change
• This study, although not directly addressing cognitive benefits, does show
that prolonged treatment with aripiprazole increased hippocampus
volume in people with FEP.
Discussion
Symptomatic changes in relation to
hippocampal volume change
Conclusion
Take home message
Aripiprazole as first line treatment in FEP
Symptomatic remission
+
Stimulation of neurogenesis in
hippocampus; helping repair
of dysfunctional brain circuits
Thank you

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The effect of second-generation antipsychotics on hippocampal volume in first episode of psychosis: longitudinal study

  • 1. The effect of second-generation antipsychotics on hippocampal volume in first episode of psychosis: longitudinal study Michael Bodnar, Ashok K. Malla, Carolina Makowski, M. Mallar Chakravarty, Ridha Joober, Martin Lepage British Journal of Psychiatry Open Mar 2016, 2 (2) 139-146 Presenter- Kapil Kulkarni Guided by – Dr. Basavaraja Papanna , Consultant Psychiatrist, Herrick House, NEP NHS Trust, Colchester, UK
  • 2. Background • Most consistent neuroimaging findings in Schizophrenia and related psychosis is marked decrease in – 1. Whole-brain volume 2. Whole-brain grey matter 3. Frontal grey and white matter • One study- Reduced grey matter hippocampus- poorer outcome • Identifying a protective molecule-can alter the course of treatment and outcome. • A recent meta-analysis- clozapine leads to less evident loss and, in some cases, actually increased whole-brain gray matter. • Aripiprazole- improved memory performance in schizophrenia. But any positive structural brain alterations, particularly in the hippocampus is uncertain.
  • 3. This study… • Compared hippocampal grey matter changes over 1-year period in people with a first episode of psychosis (FEP) taking aripiprazole with those taking other second-generation antipsychotics and with non-clinical controls. • Hypothesis- Patient taking aripiprazole would show an increase in hippocampal volume.
  • 4. This study… • At Douglas Mental Health University Institute in Montreal, Canada. • Approved by the Research Ethics Board of the Douglas Mental Health University Institute and the McGill University Faculty of Medicine. • Patients admitted and treated at PEPP between January 2004 and June 2014 • PEPP is a specialized early intervention service at the Douglas Mental Health University Institute in Montreal, Canada. It serves 14- to 35-year-olds with a diagnosis of affective or non-affective psychosis who have had no more than 1 month of previous antipsychotic treatment; without organic brain damage, a pervasive developmental disorder, an IQ below 70, or epilepsy; and do not have substance-induced psychosis.
  • 5. Methods Participants • Eligibility- 1. Individuals admitted and treated at the Prevention and Early Intervention Program for Psychoses (PEPP) 2. Aged 18–30 years 3. No history of neurological disease or head trauma causing loss of consciousness • Diagnoses- 1. SCID 2. Validated through consensus with a staff research psychiatrist
  • 6. • A control group- Recruited through advertisements in local newspapers • Exclusion criteria- 1. Individual with current or past history of any Axis I disorder, any neurological disease, head trauma causing loss of consciousness 2. First-degree relative diagnosed with schizophrenia or a related spectrum disorder. • Consent- written informed consent from all participants. Methods Participants
  • 7. • Treatment of FEP in PEPP- 1. A comprehensive approach- Pharmacotherapy + Psychological therapies 2. Pharmacotherapy for all patients- with a second-generation antipsychotic (olanzapine, risperidone, paliperidone, quetiapine or aripiprazole). 3. If no optimal response within 4–6 weeks or significant side effects emerge- change to a different antipsychotic 4. Patients who refuse pharmacotherapy- psychosocial interventions Methods Treatment settings
  • 8. Methods Clinical and sociodemographic data • Clinical data were collected near entry and at months 1, 2, 3, 6, 9, 12 and 18 • Data obtained at baseline- 1. Education level (years completed) 2. Parental socioeconomic status 3. Handedness 4. Duration of untreated psychosis (DUP) 5. Duration of untreated illness (DUI) 6. Full-scale IQ • Type and dosage of antipsychotic prescribed- Noted at each assessment and converted into chlorpromazine equivalents.
  • 9. • Changes in total positive (SAPS) and negative symptoms (SANS) over the period of time were noted. • Evaluators, who are not involved in patient treatment, have established inter-class correlations of 0.89 and 0.71 on the SAPS and SANS respectively • Percentage of time spent in positive symptom remission during the interscan interval was also calculated. (positive remission was defined as mild or less on all four global scores of the SAPS). Methods Clinical and sociodemographic data
  • 10. Methods Longitudinal Structural MRI data acquisition and processing • Scanning- At the Montreal Neurological Institute • For each participant, T1 MR images were acquired using a 3D gradient- echopulse sequence • Scan 1 – Baseline • Scan 2 – After 1 year • Same scanner and parameters were used at both Scan 1 and Scan 2 • 88 people with FEP and 46 controls completed both scans
  • 11. • Whole hippocampal volume- FreeSurfer v5.3 • T1 images were automatically processed in using the hippocampal-subfields and longitudinal streams. • Whole hippocampal volume- MAGeT-Brain (Multiple Automatically Generated Templates) algorithm. • The T1 images were reprocessed using an independent pipeline, the, based on subfield definitions derived from the Chakravarty Laboratory • Hippocampal volumes derived from MAGeT-Brain were found to strongly overlap with those derived using FreeSurfer. Methods Longitudinal Structural MRI data acquisition and processing
  • 12. • Subfield volumes derived from each technique were summed to obtain left- and right-side hippocampal volumes • Scan 1 volumes were subtracted from Scan 2 volumes to see change over time • Finally, total intracranial volume (TIV) was estimated using FreeSurfer for patients and controls. Methods Longitudinal Structural MRI data acquisition and processing
  • 13. Methods Antipsychotic treatment subgroups • Subgroups of patients done based on the type of antipsychotic taken during the interscan interval. • To be considered for a subgroup, a patient had to take one type of an antipsychotic for a minimum of 6 consecutive months with an average adherence above 50%. • The chosen time period of 6 months- justified by a seminal paper written by Lieberman and colleagues- median discontinuation for antipsychotics was around the 6-month period, confirmed by an independent trial • Medication adherence protocol - Validated protocol based on composite information from Patient Family members Treating team. This has been shown to be as efficacious as pill-counting 0=never (0%) 1=very infrequently (1–25%) 2=sometimes (26–50%) 3=quite often (51–75%) 4=fully (76–100%)
  • 14. • Patients who refused antipsychotic treatment or had less than 50% adherence (score of 2 or less) were categorised into the ‘refused- antipsychotics (APs)’ subgroup. Methods Antipsychotic treatment subgroups
  • 15. Methods Sample size • Of the 88 people with FEP with two MRI scans, 26 were removed due to: 1. Missing key clinical data (n=1) 2. Technical/processing errors (n=1) 3. Concurrent antidepressant use (n=5) 4. Polypharmacy of antipsychotics (n=9) 5. Insufficiently sized subgroups (n=10) Those taking quetiapine (n=5), ziprasidone (n=3), haloperidol (n=1) and asenapine (n=1) were excluded as any results would have been uninterpretable due to small subgroup sizes. • Two controls were also removed due to processing errors • The final sample size- 62 people with FEP and 44 controls
  • 16. • Final FEP subgroups included(n=62): 1. Risperidone/paliperidone (n=24) Paliperidone is the active metabolite of risperidone and has been shown to have a similar efficacy and treatment profile 2. Olanzapine (n=12) 3. Aripiprazole (n=13) 4. Refused-APs (n=13) • Final Controls (n=44) Methods Final Antipsychotic subgroups
  • 17. • All analyses were performed by using SPSS 22 and were two-tailed with a critical P-value of 0.05, except where noted. Methods Statistical Analyses
  • 18. • Sample characteristics were analysed by using 1. One-way ANOVAs - Continuous variables 2. Kruskall–Wallis H-tests- Nominal variables 3. Median tests- DUP and DUI Methods Statistical Analyses
  • 19. Methods Statistical Analyses • Hippocampal volumes from FreeSurfer and MAGeT-Brain analysis- Repeated measure ANOVA 1. ‘Group’ as the between-group factor- (risperidone/paliperidone, olanzapine, aripiprazole, refused-APs, controls) 2. ‘Side’ as the within-group factor (left, right) • Analyses were one-tailed and included the following covariates: 1. Age at Scan 1 2. Age at Scan 2 3. Education 4. Gender 5. Handedness 6. Overall antipsychotic dosage per month 7. TIV
  • 20. • SAPS and SANS totals (at baseline, month 6, month 12, month 18) were analysed- Generalised estimating equations (GEEs) • (significant P-value was set to 0.012) (0.05/4 time points) • GEE is a multivariate extension of the generalised linear model to analyse repeated measurements or other correlated observations. • Advantages of GEE: 1. Examining a large, longitudinal data-set 2. Accommodate violations of normality (homogeneity of variance) 3. Accommodate incomplete data based on population quantities and data distributions (allows the exclusion of a single missing observation without having to exclude an entire subject) Methods Statistical Analyses
  • 21. Results Sample Characteristics • For all participants, there were no significant between-group differences in age at Scan 1, age at Scan 2, parental socioeconomic status, gender, handedness, full-scale IQ, interscan interval or TIV; however, there were significant differences regarding education, with controls completing the most years. • Among the FEP subgroups, there were no significant differences in the age at onset of psychosis, diagnosis, time from PEPP entry to Scan 1, DUP, DUI or antipsychotic dosage prescribed; however, there were significant differences regarding time spent on antipsychotic and overall medication adherence. • As expected, the refused-APs subgroup spent the lowest time taking the prescribed antipsychotic (average of 3.4 v. 11.9 months for the other three subgroups) and had the lowest adherence (average of 35% v. 88% for the other three subgroups). See Tables 1 and 2 for data and results.
  • 22. Variable Risperid one/pali peridone (n=24) Olanzapine (n=12) Aripiprazole (n=13) Refused -APs (n=13) Controls (n=44) Statistic d.f. P Age at onset, years: mean (s.d.) 22.5 (3.5) 22.3 (3.2) 23.3 (4.1) 24.3 (3.1) – F=0.94 3.57 0.429 Parental SES, mean (s.d.)a 3.3 (1.1) 3.0 (1.1) 2.9 (0.8) 3.1 (0.9) 3.3 (0.8) χ2=4.45 4 0.348 Educatio n, mean (s.d.)b 11.1 (2.4) 12.7 (2.3) 12.5 (2.0) 12.7 (2.4) 14.3 (2.5) F=7.22 4.101 <0.001 Full-scale IQ, mean (s.d.) [n] 96.5 (14.6) 100.8 (16.5) 105.5 (13.9) 105.5 (12.5) 111.1 (14.6) [42] F=3.05 4.95 0.233 Table 1 General sample characteristics APs, antipsychotics; DUP, duration of untreated psychosis; DUI, duration of untreated illness; SES, socioeconomic status. ↵a Hollingshead parental SES: 1=high SES and 5=low SES. ↵b Number of school years completed. Controls>all subgroups (all P<0.042). ↵c Final diagnosis obtained after 1 year of treatment, not initial diagnosis at entry.
  • 23. Variable Risperidon e/paliperid one (n=24) Olanzapine (n=12) Aripiprazole (n=13) Refused- APs (n=13) Controls (n=44) Statistic d.f. P Right handed, n (%) 17 (70.8) 10 (83.3) 12 (92.3) 9 (69.2) 38 (86.4) χ2=4.75 4 0.314 Male,n (%) 18 (75.0) 6 (50.0) 10 (76.9) 9 (69.2) 26 (59.1) χ2=3.84 4 0.429 Non- affective disorder, n (%)c 23 (95.8) 8 (66.7) 10 (76.9) 10 (76.9) – χ2=5.54 3 0.136 DUP, weeks: median [n] 18.6 [23] 17.8 12.8 [10] 20.6 [11] – χ2=2.08 3 0.556 DUI, weeks: median [n] 394.6 200.9 207.4 [9] 255.3 [11] – χ2=5.87 3 0.118 Table 1 General sample characteristics APs, antipsychotics; DUP, duration of untreated psychosis; DUI, duration of untreated illness; SES, socioeconomic status. ↵a Hollingshead parental SES: 1=high SES and 5=low SES. ↵b Number of school years completed. Controls>all subgroups (all P<0.042). ↵c Final diagnosis obtained after 1 year of treatment, not initial diagnosis at entry.
  • 24. Variable Risperidone /paliperidon e (n=24) Olanzapine (n=12) Aripiprazole (n=13) Refused- APs (n=13) Controls (n=44) Statistic d.f. P Age at Scan 1, years: mean (s.d.) 23.7 (3.6) 23.4 (3.3) 23.5 (4.2) 25.9 (3.1) 23.9 (3.4) F=1.15 4.101 0.336 Age at Scan 2, years: mean (s.d.) 24.9 (3.6) 24.5 (3.3) 24.6 (4.2) 27.0 (3.1) 24.9 (3.4) F=1.15 4.101 0.339 From entry to Scan 1, months: mean (s.d.) 4.2 (2.0) 3.9 (2.3) 4.4 (1.7) 3.8 (1.4) – F=0.30 3.58 0.826 Interscan interval, months: mean (s.d.) 13.7 (1.4) 13.0 (1.3) 12.6 (1.3) 13.0 (1.4) 12.8 (1.3) F=2.44 4.101 0.052 Time spent on antipsychotic, months: mean (s.d.)a 11.6 (2.9) 12.1 (1.9) 12.1 (1.0) 3.4 (3.2) – F=39.01 3.58 <0.001 • Table 2: Sample characteristics related to neuroimaging data and interscan interval • APs, antipsychotics; CPZ, chlorpromazine; SAPS, Scale for the Assessment of Positive Symptoms; SANS, Scale for the Assessment of Negative Symptoms. • ↵a Number of months that antipsychotic was taken for during interscan interval. Refusal<all subgroups (all P<0.001). • ↵b Average prescribed dosage in CPZ equivalents (mg/day) per month during interscan interval. • ↵c Average overall medication adherence during interscan interval. Refusal<all subgroups (all P<0.001). • ↵d Percentage of time spent in positive symptom remission during interscan interval. • ↵e Change in symptom totals during interscan interval; a negative value indicates a decrease in total (improvement) from Scan 1 to Scan 2.
  • 25. Variable Risperidone/ paliperidone (n=24) Olanzapine (n=12) Aripiprazole (n=13) Refused-APs (n=13) Controls (n=44) Statistic d.f. P CPZ/month, mean (s.d.)b 154.6 (103.8) 172.8 (97.4) 150.3 (103.0) 70.8 (96.3) – F=2.67 3.58 0.056 Adherence, %: mean (s.d.)c 83.3 (18.7) 91.8 (16.0) 89.2 (16.2) 35.1 (35.6) – F=18.71 3.58 <0.001 Time in remission, %: mean (s.d.)d 70.6 (33.5) 67.9 (38.2) 73.9 (35.1) 66.1 (39.1) – F=0.12 3.58 0.950 Change in SAPS total, mean (s.d.)e 0.38 (9.86) 1.75 (17.60) –0.85 (7.14) 2.15 (10.62) – F=0.19 3.58 0.904 Change in SANS total, mean (s.d.)e –0.50 (15.08) –2.17 (4.57) –8.00 (15.32) –3.46 (14.26) – F=0.88 3.58 0.458 Intracranial volume, cm3: mean (s.d.) 1705 (135) 1679 (177) 1758 (163) 1683 (188) 1697 (176) F=0.47 4.101 0.760
  • 26. • Over the interscan interval, there were no significant subgroup differences in the change of positive symptom totals (SAPS) and negative symptom totals (SANS) (Table 2). • In addition, there were no significant subgroup differences in the amount of time spent in positive symptom remission (Table 2). Results Symptom total (SAPS/SANS) changes and remission
  • 27. • For SAPS total, there was a significant main effect of ‘time’ (Wald χ2=188.24, df=3, P<0.001) (Fig. 1). • All patients with FEP displayed a significant decrease from baseline to month 6 (P<0.001) with no changes thereafter (all P’s>0.273). • For SANS total, there was a significant main effect of ‘time’ (Wald χ2=27.39, df=3, P<0.001) and of ‘group’ (Wald χ2=11.14, df=3, P=0.011) (Fig. 1). • All patients with FEP displayed a significant decrease from baseline to month 6 (P<0.001) with minimal changes thereafter (all P’s>0.102). • The risperidone/paliperidone subgroup had a higher total overall compared with the other three subgroups (all P’s<0.041); no other subgroup differences were apparent (all P’s>0.354). Results Symptom total (SAPS/SANS) changes and remission
  • 28. Fig. 1 Positive and negative symptom totals among first-episode psychosis (FEP) subgroups. The error bars represent standard error. All people with FEP showed a significant improvement in both measures over the first 6 months of treatment. The risperidone/paliperidone (Risp/Palp) subgroup had higher negative symptoms overall compared with the other three subgroups. SAPS, Scale for the Assessment of Positive Symptoms; SANS, Scale for the Assessment of Negative Symptoms; Olanz,
  • 29. Results Hippocampal Volume change • For FreeSurfer, the repeated-measures ANCOVA revealed a significant between-group effect (F=2.88, P=0.014). • Aripiprazole subgroup had a significantly larger increase in total bilateral volume compared with the risperidone/paliperidone subgroup (P=0.008, Cohen’s d=0.92), the olanzapine subgroup (P=0.005, Cohen’s d=1.38), the refused-APs subgroup (P=0.005, Cohen’s d=1.30) and the controls (P=0.002, Cohen’s d=1.20).
  • 30. Fig. 2 Change in grey matter volume in the hippocampus for first-episode psychosis (FEP) subgroups and controls. The error bars represent standard error. The aripiprazole subgroup displayed a significantly larger change in bilateral hippocampal volume compared with all FEP subgroups and controls for volumes derived from both FreeSurfer and MAGeT-Brain. Risp/Palip, risperidone/paliperidone; Olanz, olanzapine; APs, antipsychotics.
  • 31.
  • 32.
  • 33. Results Correlations involving changes over interscan interval • No significant correlations between hippocampal volume change and SAPS and SANS total changes (Table 3). • Exploring only within the aripiprazole subgroup (n=13), bivariate correlations were also not significant:  between SAPS total change and hippocampal volume change for FreeSurfer volumes (r=0.376, P=0.206) or for MAGeT-Brain volumes (r=0.291, P=0.334)  between SANS total change and hippocampal volume change for FreeSurfer volumes (r=–0.260, P=0.391) or for MAGeT-Brain volumes (r=–0.203, P=0.506)  or between total antipsychotic dosage and hippocampal volume change for FreeSurfer volumes (r=–0.315, P=0.294) or for MAGeT-Brain volumes (r=–0.236, P=0.268)
  • 34.
  • 35. Results Correlation at scan1 and scan 2 • Partial correlations, controlling for subgroup, between SAPS total and hippocampal volumes at both Scan 1 and at Scan 2 revealed no significant associations for FreeSurfer volumes (all Ps>0.467) or for MAGeT-Brain volumes (all P’s>0.643). • At Scan 1 partial correlations with SANS total revealed significant negative associations with right (r=–0.286, P=0.025) and total (r=–0.267, P=0.037) FreeSurfer volumes; but there were no significant correlations found for the MAGeT-Brain volumes (all P’s>0.175). • At Scan 2, there were no significant correlations between SANS total and hippocampal volumes for either FreeSurfer volumes (all P’s>0.420) or for MAGeT-Brain volumes (all P’s>0.818) (supplementary Table DS2)
  • 36.
  • 37. Discussion • This study observed- People with FEP taking aripiprazole displayed a significant increase in bilateral hippocampal volume over a 1-year follow- up period • This finding was obtained from two independent neuroimaging pipelines FreeSurfer v5.3 and MAGeT-Brain. • Aripiprazole is as effective as other antipsychotics with respect SAPS and SANS reduction, and time spent in remission. • So aripiprazole may be a good treatment option with an added benefit of enhanced hippocampal plasticity and increasing volume which may affect future clinical status.
  • 38. Discussion Aripiprazole and augmenting hippocampal growth • Adult human brain is capable of neurogenesis from neural stem cells, but this growth is limited to the hippocampus. • This phenomenon attracted more attention recently as it may play role in hippocampal-dependent learning and memory. • So hippocampal growth is possible if correct pathways are triggered. • Aripiprazole- a dopamine/serotonin system stabilizer. • Its partial agonist to D2, 5HT1A and 5HT7 receptors and antagonist at D1, 5HT2A and 5HT6 receptors.
  • 39. • Aripiprazole in animals models of depression and schizophrenia- i. Better memory function ii. Increased dopamine iii. Brain-derived neurotrophic factor (BDNF) in hippocampus. • Mouse model involving neuronal loss in the dentate gyrus- Aripiprazole increased proliferation of newly generated neurons • In humans, people with schizophrenia- improved memory function with aripiprazole treatment. Discussion Aripiprazole and augmenting hippocampal growth
  • 40. • A functional MRI study in people with schizophrenia using aripiprazole- improved working memory. • All above findings- aripiprazole may be related to an overall improvement of memory function as well as inducing neuroanatomical alterations in memory system structures, especially hippocampus. Discussion Aripiprazole and augmenting hippocampal growth
  • 41. • Exact mechanisms is unclear- but probably 5-HT1A agonism may help to induce adult neurogenesis. (Antipsychotics with 5-HT1A agonism include aripiprazole, ziprasidone, clozapine, asenapine and Lurasidone) • One study showed that people with reduced BDNF secretion- displayed poorer memory performance along with abnormal hippocampal functioning. • Interestingly, aripiprazole has been shown to enhance BDNF levels. Discussion Aripiprazole and augmenting hippocampal growth
  • 42. • Taken together, BDNF secretion and 5-HT1A agonistic action of aripiprazole, could favourably enhance adult neurogenesis in the hippocampus. • Future studies are warranted to explore the underlying mechanisms of adult neurogenesis with aripiprazole. Discussion Aripiprazole and augmenting hippocampal growth
  • 43. Discussion Symptomatic changes in relation to hippocampal volume change • This study- changes in hippocampal volume over the interscan interval did not significantly correlate with changes in either positive or negative symptoms or with the total amount of antipsychotics taken (in chlorpromazine equivalents). • This suggests that the change in hippocampal volume with aripiprazole, was not an effect related to symptomatic change over time or to the amount of medication taken. • So this claim should be verified in a future controlled study.
  • 44. • Moreover, this study found no relationship between positive symptoms and hippocampal volumes at Scan 1 or at Scan 2 using both FreeSurfer and MAGeT-Brain. • However, this study did find a negative correlation between right hippocampal volume and negative symptoms total at Scan 1, using FreeSurfer volumes only. Discussion Symptomatic changes in relation to hippocampal volume change
  • 45. Discussion Symptomatic changes in relation to hippocampal volume change • These findings are noteworthy, as previous studies using FreeSurfer have noted significant correlations with both positive and negative symptoms in hippocampal subfield analyses. • For the positive symptoms, one study found these associations particular to the CA1 and CA2/3 subfields, another study found the associations particular to presubiculum and sublicuum subfields and the final study found no such relationship with hippocampal volumes. • Of note, the study by Mathew et al explored hippocampal volumes in 886 participants across a six-site collaboration and noted an intersite scanning variation that was controlled for using a covariate. • Although the power was evident in this study with such a large sample size, results may have been confounded by the varying scanners that were employed. • An interesting suggestion would be to re-analyse their data using another pipeline such as MAGeT-Brain to help identify whether the issue was with FreeSurfer itself.
  • 46. • Finally, this results suggested that smaller hippocampal volumes at Scan 1 were related to worse negative symptoms, a finding supported by Kawano et al. • In fact, this group showed the relationship was specific with CA2/3 and CA4/dentate gyrus subfield volumes. • Although we did not explore subfield volumes, it would appear there are specific subfields that may be related to symptomology. • As such, we further suggest that any future study exploring the relationship between aripiprazole and hippocampal growth should explore for changes within the subfields. Discussion Symptomatic changes in relation to hippocampal volume change
  • 47. • This study, although not directly addressing cognitive benefits, does show that prolonged treatment with aripiprazole increased hippocampus volume in people with FEP. Discussion Symptomatic changes in relation to hippocampal volume change
  • 48. Conclusion Take home message Aripiprazole as first line treatment in FEP Symptomatic remission + Stimulation of neurogenesis in hippocampus; helping repair of dysfunctional brain circuits

Editor's Notes

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