Published in
BioMed Central, BMC Neuroscience, 1(15), 2014
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Association of anxiety with intracortical inhibition and descending pain modulation in chronic myofascial pain syndrome
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Liciane Fernandes Medeiros ,
Jairo Alberto Dussán-Sarria,
Jairo Alberto Dussán Sarria,
Letizzia Dall Agnol,
Letizzia Dall’Agnol,
Alicia Deitos,
Aline Patrícia Brietzke,
Gabriela Laste,
Joanna Ripoll Rozisky,
Felipe Fregni ,
Wolnei Caumo
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Abstract
Abstract Background This study aimed to answer three questions related to chronic myofascial pain syndrome (MPS): 1) Is the motor cortex excitability, as assessed by transcranial magnetic stimulation parameters (TMS), related to state-trait anxiety? 2) Does anxiety modulate corticospinal excitability changes after evoked pain by Quantitative Sensory Testing (QST)? 3) Does the state-trait anxiety predict the response to pain evoked by QST if simultaneously receiving a heterotopic stimulus [Conditional Pain Modulation (CPM)]? We included females with chronic MPS (n = 47) and healthy controls (n = 11), aged 19 to 65 years. Motor cortex excitability was assessed by TMS, and anxiety was assessed based on the State-Trait Anxiety Inventory. The disability related to pain (DRP) was assessed by the Profile of Chronic Pain scale for the Brazilian population (B:PCP:S), and the psychophysical pain measurements were measured by the QST and CPM. Results In patients, trait-anxiety was positively correlated to intracortical facilitation (ICF) at baseline and after QST evoked pain (β = 0.05 and β = 0.04, respectively) and negatively correlated to the cortical silent period (CSP) (β = -1.17 and β = -1.23, respectively) (P