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Using event-related potentials to characterize inhibitory control and self-monitoring across impulsive and compulsive phenotypes: a dimensional approach to OCD
- Sakshi Dhir, Kaelasha Tyler, Lucy Albertella, Samuel R. Chamberlain, Wei-Peng Teo, Murat Yücel, Rebecca A. Segrave
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- Journal:
- CNS Spectrums / Volume 28 / Issue 3 / June 2023
- Published online by Cambridge University Press:
- 29 April 2022, pp. 331-342
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Objective
“Subsyndromal” obsessive-compulsive disorder symptoms (OCDSs) are common and cause impaired psychosocial functioning. OCDSs are better captured by dimensional models of psychopathology, as opposed to categorical diagnoses. However, such dimensional approaches require a deep understanding of the underlying neurocognitive drivers and impulsive and compulsive traits (ie, neurocognitive phenotypes) across symptoms. This study investigated inhibitory control and self-monitoring across impulsivity, compulsivity, and their interaction in individuals (n = 40) experiencing mild–moderate OCDSs.
MethodsEEG recording concurrent with the stop-signal task was used to elicit event-related potentials (ERPs) indexing inhibitory control (ie, N2 and P3) and self-monitoring (ie, error-related negativity and correct-related negativity (CRN): negativity following erroneous or correct responses, respectively).
ResultsDuring unsuccessful stopping, individuals high in both impulsivity and compulsivity displayed enhanced N2 amplitude, indicative of conflict between the urge to respond and need to stop (F(3, 33) = 1.48, P < .05, 95% Cl [−0.01, 0.001]). Individuals high in compulsivity and low in impulsivity showed reduced P3 amplitude, consistent with impairments in monitoring failed inhibitory control (F(3, 24) = 2.033, P < .05, 95% CI [−0.002, 0.045]). Following successful stopping, high compulsivity (independent of impulsivity) was associated with lower CRN amplitude, reflecting hypo-monitoring of correct responses (F(4, 32) = 4.76, P < .05, 95% CI [0.01, 0.02]), and with greater OCDS severity (F(3, 36) = 3.32, P < .05, 95% CI [0.03, 0.19]).
ConclusionThe current findings provide evidence for differential, ERP-indexed inhibitory control and self-monitoring profiles across impulsive and compulsive phenotypes in OCDSs.
59 “Lithium Damaged My Spine” Might not Be a Delusion After All
- Muhammad Zaidi, Anurag Prabhu, Jose Perez Martell, Sakshi Dhir
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- Journal:
- CNS Spectrums / Volume 24 / Issue 1 / February 2019
- Published online by Cambridge University Press:
- 12 March 2019, pp. 206-207
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Background
Lithium remains to be the drug of choice for treating BPAD for the past few decades. There is extensive literature showing the effectiveness of Lithium when used as a mood stabilizing agent in bipolar spectrum disorders. However significant number of articles show that a third of the patients who receive lithium for their symptomology not only do not show any response but also may show deterioration of their clinical symptoms. (However, research shows that Lithium may negatively affect a third of the patients depending on various factors). The side effect profile of Lithium and especially its neurotoxic effects were discussed in depth in literature over the last decade. Although Lithium remains first choice as maintenance treatment for bipolar affective disorder, about half of all individuals may stop their treatment at some point, despite its proven benefits concerning the prevention of severe affective episodes and suicide.
MethodsThe authors performed a systematic literature review to recognize the significance of negative effects of Lithium in a minority of patient population and also comment on the factors influencing patient compliance. We ran a literature search on Pubmed using the following terms: “Lithium” AND (“schizoaffective disorder [MeSH terms]” OR “Bipolar Affective disorder [MeSH terms]” ). Our inclusion criteria were studies which have observed effects of Lithium in schizoaffective patient population or bipolar affective patient population. Studies with other concurrent diagnoses were excluded.
Case presentationWe discuss a fifty nine year old male with a history of multiple admissions to a forensic hospital care setting. He initially endorsed a diagnosis of Psychotic disorder NOS which was later changed to schizoaffective disorder during his subsequent admissions. He presented with affective psychotic features where his mood was labile shifting from melancholic to euphoric and a concurrent history of auditory verbal hallucinations. He displayed paranoid non-bizarre persecutory delusions and also alleged that one of his doctors had hated him and put him on Lithium as a form of punishment. He claims that Lithium, as a result, has significantly affected him negatively and also damaged his nerves. This led the authors to explore the significance of use of Lithiumin people with schizoaffective disorders and also bipolar affective disorders. We also discuss the disease course in the patient and his clinical response to use of various psychotropic medications.
ConclusionsThe case exemplifies the negative effects of Lithium when used as a mood stabilizer in patient population that is susceptible to its adverse effects due to various factors.