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Open research questions in Bipolar Disorder and Treatment

117 unresolved questions extracted from the limitations and future-work sections of 1,522 Bipolar Disorder and Treatment papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • Chronotherapeutic interventions such as total sleep deprivation combined with light therapy (TSD + LT) produce rapid antidepressant effects, but predictors of outcome are lacking.

    Fractal dynamics in spontaneous motor activity associate with effective antidepressant chronotherapeutic response, cerebellar volumes, and white matter microstructure in bipolar disorder · 2026 · DOI

  • BackgroundEmotion dysregulation is a core feature of bipolar disorder (BD), yet its behavioral expression during depressive episodes, and potential differences between its types, BD-I and BD-II, remain unclear.

    Context-dependent facial-expression patterns during affective film viewing in patients with bipolar depression · 2026 · DOI

  • INTRODUCTION: Mood and/or affective instability and circadian rhythm disruptions are increasingly recognised in psychiatric disorders, notably bipolar disorder (BD), but their interrelationship remains unclear.

    Identifying Mood Instability and Circadian Rest‐Activity Patterns Using Digital Remote Monitoring and Actigraphy in Participants at Risk for Bipolar Disorder · 2026 · DOI

  • Notably, evidence remains scarce regarding lamotrigine dosing in geriatric populations (> 65 years) with bipolar comorbidity, where age-related pharmacokinetic changes (hepatic metabolism decline, CYP450 inhibition potential) necessitate ultra-gradual titration from subtherapeutic doses.

    Clinical effects of lamotrigine combined with duloxetine in the treatment of bipolar depression · 2026 · DOI

  • Patients with bipolar disorder (BD) may also experience manic or mixed episodes postpartum, but cases of delirious mania (DM)—characterized by rapidly evolving delirium, mania, and may involve psychotic symptoms—are rarely reported.

    Postpartum delirious mania in a patient with diagnosis of bipolar disorder after cesarean delivery: a case report · 2026 · DOI

  • Included papers showed that (1) rejection sensitivity is raised in bipolar disorder compared to unipolar depression; (2) fear of negative evaluation is raised in comparison to controls but not unipolar depression and; (3) anxiety sensitivity is not raised in bipolar disorder compared to unipolar depression, although conclusions are limited by the number of papers.

    Fundamental Fears in Bipolar Disorder: A Systematic Review and Meta-Analysis · 2026 · DOI

  • Background: Lithium is the gold-standard mood stabilizer in bipolar disorder (BD) showing putative neuroprotective effects, but its association with cognition in older adults with BD (OABD) remains unclear.

    Neurocognitive changes in lithium-treated older adult bipolar patients on antipsychotics · 2026 · DOI

  • Limitations of our study that should be noted include self- report bias, distribution of DSM disorders, age range, and ethno-racial diversity. First, our results are subject to self-report bias given our use of the ARI-C/P and KSADS self-report. However, we worked to mitigate self-report bias by obtaining the same information from both children and parents, and our analyses were explicitly designed to assess for rater bias. Second, given our transdiagnostic sample was recruited across the range of irritability, rather than explicitly recruited to produce a minimum number of participants with specific DSM diagnoses, we did not have a large enough sample of other disorders beyond MDD, GAD, ADHD, and ODD to use as a basis for measurement invariance tests. For example, we had insufficient numbers of participants with DMDD, fewer than 10%, to examine specific correlates. However, we did not have a sampling bias for DMDD, or any other DSM diagnoses, because DSM diagnoses were not part of our recruitment strategy or inclusion criteria. This suggests a need for additional studies comparing large samples of children whose primary DSM diagnosis involves irritability, as well as larger transdiag- nostic samples, to see if our irritability results generalize beyond our most prevalent diagnoses. Third, our sample looked at elementary school aged through high school aged children. Therefore, our age-related ARI-P results may not be generalizable to preschool children and/or older ado- lescents/transition age youths. Encompassing a wider age range in future research could help to further understand irritability manifestations across development. Last, while we had a range of reported ethnicities, most of our sample identified as white. In attempts to mitigate this, we sought to recruit participants through community health events, hospital healthcare records at various levels of care and specialties, and community Facebook pages. Future stud- ies should assess reporting and manifestations of irritability across diverse racial and ethnic populations to help improve diagnosis and treatment. As our findings support other studies indicating that irrita- bility present similarly various diagnosis, it raises the ques- tion of how best to treat irritability. Some have suggested it is best to treat the primary diagnoses associated with irritabil- ity, such as MDD, for which there are disorder-specific treat- ment manuals and medication protocols [32]. In contrast, another approach that aligns with the idea that irritability is a transdiagnostic problem would be to treat the irritability, regardless of primary diagnoses. For example, the Unified 1 3European Child & Adolescent Psychiatry Protocol (UP)’s transdiagnostic approach has shown strong treatment effects, with greater improvement in irritability, along with sadness, anxiety, and cognitive flexibility in chil- dren and adults [41–43]. Current research has shown sup- port for both disorder specific and a UP approach to treating irritability in children [43–46]. Given the findings from our transdiagnostic study, further research on the UP for children and adolescents and the impact on irritability is needed to establish efficacy of these treatments. This could decrease the burden on children and families struggling with varying levels of irritability and improve long-term functioning.

    Diagnostic- and age-based measurement invariance of irritability in youths · 2026 · DOI

  • While previous research indicates that standard pharmacological treatment of both conditions may be effective in individuals with PHMDS, there is limited knowledge concerning treatment when bipolar disorder and catatonia co-occur.

    Case study: bipolar disorder and catatonia in an adult autistic male with intellectual disability and Phelan-McDermid syndrome (22q13.33 deletion syndrome): psychopharmacological treatment and symptom trajectories · 2024 · DOI

  • Background: The interaction of polygenic risk (PRS) and environmental effects on development of bipolar disorder (BD) is understudied, as are high-risk offspring perceptions of their family environment (FE).

    Family environment and polygenic risk in the bipolar high‐risk context · 2023 · DOI

  • Despite the negative finding on the primary outcome, an exploratory analysis suggested that cannabidiol should be further studied in bipolar depression in higher doses of at least 300 mg/day and under research designs that could better control for high placebo response.

    Cannabidiol as an Adjunctive Treatment for Acute Bipolar Depression: A Pilot Study: Le cannabidiol comme traitement d'appoint de la dépression bipolaire aiguë : une étude pilote · 2023 · DOI

  • Regarding the diagnosis of lithium-induced acne development, the history of drug intake, the sudden onset and an unusual age of onset, as well as the initiation of lithium therapy, the drug dose, the duration of the treatment, the absence of other triggering factors, and the clinical relationship between the administration of the drug and the onset of acne should be examined in detail.

    Lityum kullanımına bağlı gelişen akne: bir olgu sunumu. · 2020 · DOI

  • 'Paediatric bipolar disorder' (PBD) remains controversial; because it is based on the hypothesis that bipolar disorder (BD) often begins in childhood with atypical forms of mania.

    Debate: Bipolar disorder: extremely rare before puberty and antipsychotics cause serious harms – a commentary on Van Meter et al. (2019) · 2019 · DOI

  • OBJECTIVES: Some scientific reports indicate the changes in the concentration of serum copper in patients with bipolar disorder (BD), however the data are inconclusive.

    The serum concentration of copper in bipolar disorder · 2016 · DOI

  • OBJECTIVE: DSM-IV grants episodic irritability an equal status to low mood as a cardinal criterion for the diagnosis of depression in youth, yet not in adults; however, evidence for irritability as a major criterion of depression in youth is lacking.

    Irritable Mood as a Symptom of Depression in Youth: Prevalence, Developmental, and Clinical Correlates in the Great Smoky Mountains Study · 2013 · DOI

  • Although bipolar II disorder is a highly prevalent, chronic illness that is associated with burdensome psychosocial impairment, relatively little is known about the best ways to treat the disorder.

    Psychotherapy for bipolar II disorder: The role of interpersonal and social rhythm therapy. · 2012 · DOI

  • OBJECTIVE: The corpus callosum (CC) plays a pivotal role in inter-hemispheric transfer and integration of information and is a relatively understudied structure in bipolar disorder (BD).

    Meta‐analysis of magnetic resonance imaging studies of the corpus callosum in bipolar disorder · 2008 · DOI

  • OBJECTIVE: Long-term antidepressant (AD) treatment for depression in bipolar disorder (BPD) patients is highly prevalent, but its benefits and risks remain uncertain, encouraging this meta-analysis of available research.

    Long‐term antidepressant treatment in bipolar disorder: meta‐analyses of benefits and risks · 2008 · DOI

  • Appreciation of whether volumetric abnormalities are early features of BD or whether the abnormalities represent neurodegenerative changes associated with illness duration is limited by the paucity of data in juvenile samples.

    Amygdala and Hippocampal Volumes in Adolescents and Adults With Bipolar Disorder · 2003 · DOI

  • No studies have indicated that psychoactive drugs or electroconvulsive therapy (ECT) might cause the lesions, but on the other hand they can probably increase the risk of delirium complicating the treatment.

    MRI findings in patients with affective disorder: a meta‐analysis · 1997 · DOI

  • Similarly, the fact that the caregivers' duration of care, degree of closeness to the patient, and their own mental health were not assessed is another important limitation of this study.

    Psychoeducation Needs and Quality of Life in Individuals with Bipolar Disorder and Caregivers · 2026 · DOI

  • Further research into clinical behaviour is needed to understand what is driving the decrease in lithium usage, and what barriers and enablers may influence its use across the country.

    Trends and variations in Lithium usage across care settings in England between 2015-2024 · 2026 · DOI

  • A cautious, individualised approach is warranted, incorporating medication effects, comorbidity, operational context, and relapse-prevention planning, supported by collaboration between mental health professionals and diving medical examiners.

    Bipolar spectrum disorders in divers: risks, recognition, and recommendations · 2026 · DOI

  • Empirical data on diving outcomes in individuals with bipolar disorder are scarce, necessitating reliance on expert opinion and extrapolation from related safety-critical domains.

    Bipolar spectrum disorders in divers: risks, recognition, and recommendations · 2026 · DOI

  • Analysis of Reddit posts enables researchers to explore patterns, themes, and concerns that may be overlooked or underreported in clinical research, offering a more comprehensive understanding of the symptom of hypersexuality in bipolar.

    Navigating Hypersexuality in Bipolar: Insights from a Corpus-Assisted Discourse Analysis of Reddit Posts · 2025 · DOI

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117 open questions have been extracted from the limitations and future-work passages of 1,522 Bipolar Disorder and Treatment papers in our library. Each one below links back to the study that raised it, so you can read the original claim in context.

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