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Título: Reduced Prefrontal Activation in Pediatric Patients With Obsessive-Compulsive Disorder During Verbal Episodic Memory Encoding
Autor: BATISTUZZO, Marcelo CamargoBALARDIN, Joana BisolMARTIN, Maria da Graca MoraisHOEXTER, Marcelo QueirozBERNARDES, Elisa TeixeiraBORCATO, SoniaSOUZA, Marina de Marco eQUERIDO, Cicero NardiniMORAIS, Rosa MagalyALVARENGA, Pedro Gomes deLOPES, Antonio CarlosSHAVITT, Roseli GedankeSAVAGE, Cary R.AMARO JR., EdsonMIGUEL, Euripedes C.POLANCZYK, Guilherme V.MIOTTO, Eliane C.
Resumen: Objective: Patients with obsessive-compulsive disorder (OCD) often present with deficits in episodic memory, and there is evidence that these difficulties may be secondary to executive dysfunction, that is, impaired selection and/or application of memory-encoding strategies (mediation hypothesis). Semantic clustering is an effective strategy to enhance encoding of verbal episodic memory (VEM) when word lists are semantically related. Self-initiated mobilization of this strategy has been associated with increased activity in the prefrontal cortex, particularly the orbitofrontal cortex, a key region in the pathophysiology of OCD. We therefore studied children and adolescents with OCD during uncued semantic, clustering strategy application in a VEM functional magnetic resonance imaging (fMRI)-encoding paradigm. Method: A total of 25 pediatric patients with OCD (aged 8.1-17.5 years) and 25 healthy controls (HC, aged 8.1-16.9) matched for age, gender, handedness, and IQ were evaluated using a block design VEM paradigm that manipulated semantically related and unrelated words. Results: The semantic clustering strategy score (SCS) predicted VEM performance in HC (p <.001, R-2 = 0.635), but not in patients (p =.099). Children with OCD also presented hypoactivation in the dorsomedial prefrontal cortex (cluster-corrected p <.001). Within-group analysis revealed a negative correlation between Yale-Brown Obsessive Compulsive Scale scores and activation of orbitofrontal cortex in the group with OCD. Finally, a positive correlation between age and SCS was found in HC (p = .001, r = 0.635), but not in patients with OCD (p = .936, r = 0.017). Conclusion: Children with OCD presented altered brain activation during the VEM paradigm and absence of expected correlation between SCS and age, and between SCS and total words recalled. These results suggest that different neural mechanisms underlie self-initiated semantic clustering in OCD.
Aparece en las colecciones:

Artigos e Materiais de Revistas Científicas - FM/MDR
Departamento de Radiologia - FM/MDR

Artigos e Materiais de Revistas Científicas - FM/MPS
Departamento de Psiquiatria - FM/MPS

Artigos e Materiais de Revistas Científicas - HC/InRad
Instituto de Radiologia - HC/InRad

Artigos e Materiais de Revistas Científicas - HC/IPq
Instituto de Psiquiatria - HC/IPq

Artigos e Materiais de Revistas Científicas - LIM/21
LIM/21 - Laboratório de Neuroimagem em Psiquiatria

Artigos e Materiais de Revistas Científicas - LIM/23
LIM/23 - Laboratório de Psicopatologia e Terapêutica Psiquiátrica

Artigos e Materiais de Revistas Científicas - LIM/44
LIM/44 - Laboratório de Ressonância Magnética em Neurorradiologia

Artigos e Materiais de Revistas Científicas - LIM/45
LIM/45 - Laboratório de Fisiopatologia Neurocirúrgica

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