10 August 2022
Using CANTAB to examine the association of lithium and second-generation antipsychotics with neurocognition in young people with bipolar disorder
We caught up with Xinyue (Joyce) Jiang from the Centre for Addiction and Mental Health in Toronto to hear more about how her team used CANTABTM tasks to understand the effect of antipsychotic medication on cognition in young people affected by bipolar disorder.
I am a PhD student in the University of Toronto Department of Pharmacology & Toxicology, based at the Centre for Youth Bipolar Disorder (CYBD), a subspecialty clinical research program at the Centre for Addiction and Mental Health (CAMH) in Toronto, Ontario, Canada.
What is the background to your study?
People affected by bipolar disorder (BD) often report reduced neurocognitive performance across many domains, such as sustained attention, memory, or executive function. This is the case for both adults and young people with the condition. Individuals with BD also report subjective experience of mental slowing or dulling and often attribute this reduced neurocognition to their medication1,2. This contributes to suboptimal adherence, which in turn raises the risk of recurrence, hospitalization, and suicide attempts, and decreases the likelihood of achieving remission and recovery3.
Lithium and second-generation antipsychotics (SGA) are first-line antimanic medications for BD, and have been associated with reduced neurocognitive performance in adults with BD, across multiple domains such as attention, processing speed, affective processing and executive functions1,4–9.
Nonetheless, there are also studies reporting no significant association of these medications with neurocognition, and studies reporting beneficial effects on certain neurocognitive domains10–16. However, it remains inconclusive whether these medications are associated with reduced neurocognitive performance in youths with BD. The aim of this study was to examine the association of lithium and SGA with neurocognition in young people with bipolar disorder.
Which CANTABTM tasks did you use?
This cross-sectional study included 91 young people, aged 13-20, diagnosed with BD. Participants completed four CANTABTM tests, Intra/Extra Dimensional Set-Shifting (IED), Rapid Visual Information Processing (RVP), Stockings of Cambridge (SOC), and Affective Go/No-Go (AGN). We used these tests to examine set-shifting/flexibility of attention, sustained attention, spatial planning, and information processing biases, respectively, as these domains have been previously implicated in BD among youth and adults17–19. Additionally, global cognition was measured by a global composite score and a g factor that was calculated by combining selected measures from the aforementioned tests.
What were your findings?
Our data show that SGA and lithium use are not significantly associated with neurocognitive decrements in young people with BD. These results may help patients, parents, and healthcare professionals. Specifically, we hope that our findings may help to improve messaging around the side effects of and adherence to these medications, in turn reducing the stigma towards them and improving clinical outcomes of youth BD patients.
Why did you choose CANTABTM for your study?
We chose CANTABTM because it is supported by a substantial body of literature. Also, its automated and user-friendly design provides advantages especially when working with youth, who are accustomed to the computer interface and find it engaging.
What are your next steps?
To build on our findings, future studies that investigate the duration of treatment, serum drug levels and adherence to treatment in relation to effects on neurocognition would be informative. In addition, future randomized controlled clinical trials will assist in understanding the effects of psychotropic medication use on neurocognitive performance in young people with BD.
Read the full paper: https://pubmed.ncbi.nlm.nih.gov/35085001/
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Tags : cantab testimonial | cantab | cognition | bipolar disorder | medication
Xinyue (Joyce) Jiang, Centre for Addiction and Mental Health, Toronto