Abstract:
OBJECTIVES:Neurophysiologic correlates of depression severity potentially have great utility in diagnosis and treatment planning. Transcranial magnetic stimulation (TMS) measures of cortical inhibition and excitability have shown promise as biomarkers in psychiatry, but no prior work has examined correlates of illness severity in pediatric mood disorders. This study sought to examine the relationship between depression severity and TMS measures of cortical inhibition and excitability in children and adolescents. METHODS:Twenty-four depressed and 22 healthy control youth underwent TMS testing (cortical silent period [CSP], short-interval intracortical inhibition at 2-ms and 4-ms interstimulus intervals (ISIs) [SICI-2,-4], resting motor threshold [RMT] and intracortical facilitation at 10-, 15-, and 20-ms ISIs [ICF-10,-15,-20]). Symptom severity was assessed with the Quick Inventory of Depressive Symptomatology (QIDS-A17-SR) and the Children's Depression Rating Scale-Revised (CDRS-R). RESULTS:In the overall sample, the following significant negative correlations were observed: CDRS-R and CSP (right hemisphere, ρ=-0.35, p=0.021); QIDS-A17-SR and CSP (left, ρ=-0.33, p=0.031; right, ρ=-0.42, p=0.004); and CDRS-R and SICI-4 (right, ρ=-0.30, p=0.042). Among healthy control participants, additional significant negative correlations were observed between QIDS-A17-SR and right ICF-10; QIDS-A17-SR and right ICF-15; and QIDS-A17-SR and left ICF-20. Among depressed participants, significant negative correlations were observed between QIDS-A17-SR and bilateral CSP; CDRS-R and bilateral ICF-10; CDRS-R and bilateral ICF-15; QIDS-A17-SR and left ICF-10; and QIDS-A17-SR and bilateral ICF-15. LIMITATIONS:Small sample, potential developmental/age- and sex-related effects. CONCLUSIONS:These preliminary results provide evidence for a relationship between depression severity and dysfunction in GABAergic and glutamatergic cortical processes in a pediatric population.
journal_name
J Affect Disordjournal_title
Journal of affective disordersauthors
Lewis CP,Nakonezny PA,Ameis SH,Vande Voort JL,Husain MM,Emslie GJ,Daskalakis ZJ,Croarkin PEdoi
10.1016/j.jad.2015.10.020subject
Has Abstractpub_date
2016-01-15 00:00:00pages
566-575eissn
0165-0327issn
1573-2517pii
S0165-0327(15)30816-8journal_volume
190pub_type
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