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Dynamic Changes of Functional Pain Connectome in Women with Primary Dysmenorrhea.

Wu TH, Tu CH, Chao HT, Li WC, Low I, Chuang CY, Yeh TC, Cheng CM, Chou CC, Chen LF, Hsieh JC - Sci Rep (2016)

Bottom Line: PDM women exhibited a trait-related ReHo reduction in the ventromedial prefrontal cortex, part of the default mode network (DMN), during the periovulatory phase.The altered DMN-sensorimotor network may be an ongoing representation of cumulative menstrual pain.The findings indicate that women with long-term PDM may develop adaptive neuroplasticity and functional reorganization with a network shift from affective processing of salience to the cognitive modulation of pain.

View Article: PubMed Central - PubMed

Affiliation: Institute of Brain Science, School of Medicine, National Yang-Ming University, Taipei, Taiwan.

ABSTRACT
Primary dysmenorrhea (PDM) is the most prevalent gynecological problem. Many key brain systems are engaged in pain processing. In light of dynamic communication within and between systems (or networks) in shaping pain experience and behavior, the intra-regional functional connectivity (FC) in the hub regions of the systems may be altered and the functional interactions in terms of inter-regional FCs among the networks may be reorganized to cope with the repeated stress of menstrual pain in PDM. Forty-six otherwise healthy PDM subjects and 49 age-matched, healthy female control subjects were enrolled. Intra- and inter-regional FC were assessed using regional homogeneity (ReHo) and ReHo-seeded FC analyses, respectively. PDM women exhibited a trait-related ReHo reduction in the ventromedial prefrontal cortex, part of the default mode network (DMN), during the periovulatory phase. The trait-related hypoconnectivity of DMN-salience network and hyperconnectivity of DMN-executive control network across the menstrual cycle featured a dynamic transition from affective processing of pain salience to cognitive modulation. The altered DMN-sensorimotor network may be an ongoing representation of cumulative menstrual pain. The findings indicate that women with long-term PDM may develop adaptive neuroplasticity and functional reorganization with a network shift from affective processing of salience to the cognitive modulation of pain.

No MeSH data available.


Related in: MedlinePlus

The state-related ReHo and FC alterations in PDM.(A) ReHo maps. PDM group shows decreased ReHo of the anterior part of the intraparietal sulcus (aIPS) and superior parietal lobe (SPL) during the MENS phase when compared to the POV phase. The bar charts indicate the adjusted ReHo values at the peak voxel of the aIPS/SPL. The error bar corresponds to a 90% confidence interval. (B) FC maps. For ReHo-seeded (aIPS/SPL) FC between-phase comparisons, hypoconnectivity in the aIPS-bilateral posterior insula and -right postcentral gyrus FCs are observed during the MENS phase in the PDM group. Blue regions are associated with either decreased ReHo or decreased FC. Significance thresholded at the uncorrected voxel level p = 0.005 followed by the FWE-corrected cluster level p = 0.05. *Denotes the contrast(s) that are significant in between-phase comparisons. For abbreviations, see the legend of Fig. 1.
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f2: The state-related ReHo and FC alterations in PDM.(A) ReHo maps. PDM group shows decreased ReHo of the anterior part of the intraparietal sulcus (aIPS) and superior parietal lobe (SPL) during the MENS phase when compared to the POV phase. The bar charts indicate the adjusted ReHo values at the peak voxel of the aIPS/SPL. The error bar corresponds to a 90% confidence interval. (B) FC maps. For ReHo-seeded (aIPS/SPL) FC between-phase comparisons, hypoconnectivity in the aIPS-bilateral posterior insula and -right postcentral gyrus FCs are observed during the MENS phase in the PDM group. Blue regions are associated with either decreased ReHo or decreased FC. Significance thresholded at the uncorrected voxel level p = 0.005 followed by the FWE-corrected cluster level p = 0.05. *Denotes the contrast(s) that are significant in between-phase comparisons. For abbreviations, see the legend of Fig. 1.

Mentions: For the interaction effect, the between-group comparison of phase differences revealed significant greater ReHo alterations in the left declive and right orbitofrontal cortex (OFC), and lesser ReHo alterations in the left aIPS/SPL in the PDM group (Table 1; Fig. 1A). No main effects of group and phase were noted. For the between-group planned contrast, there was no difference during the MENS phase. The bilateral ventromedial prefrontal cortex (vmPFC, BA10) of DMN network, exhibited a trait-related reduction of ReHo during the POV phase in the PDM group vs. CON group (Table 1; Figs 1A and S1). For the between-phase planned contrast, PDM group demonstrated state-related reduction of the ReHo in the anterior part of the left intraparietal sulcus (aIPS, BA40) and left superior parietal lobe (SPL) of DAN network during the MENS phase vs. the POV phase (Table 1; Figs 2A and S1). The CON group demonstrated state-related reduction of ReHo in the left declive during the MENS phase vs. the POV phase.


Dynamic Changes of Functional Pain Connectome in Women with Primary Dysmenorrhea.

Wu TH, Tu CH, Chao HT, Li WC, Low I, Chuang CY, Yeh TC, Cheng CM, Chou CC, Chen LF, Hsieh JC - Sci Rep (2016)

The state-related ReHo and FC alterations in PDM.(A) ReHo maps. PDM group shows decreased ReHo of the anterior part of the intraparietal sulcus (aIPS) and superior parietal lobe (SPL) during the MENS phase when compared to the POV phase. The bar charts indicate the adjusted ReHo values at the peak voxel of the aIPS/SPL. The error bar corresponds to a 90% confidence interval. (B) FC maps. For ReHo-seeded (aIPS/SPL) FC between-phase comparisons, hypoconnectivity in the aIPS-bilateral posterior insula and -right postcentral gyrus FCs are observed during the MENS phase in the PDM group. Blue regions are associated with either decreased ReHo or decreased FC. Significance thresholded at the uncorrected voxel level p = 0.005 followed by the FWE-corrected cluster level p = 0.05. *Denotes the contrast(s) that are significant in between-phase comparisons. For abbreviations, see the legend of Fig. 1.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4835697&req=5

f2: The state-related ReHo and FC alterations in PDM.(A) ReHo maps. PDM group shows decreased ReHo of the anterior part of the intraparietal sulcus (aIPS) and superior parietal lobe (SPL) during the MENS phase when compared to the POV phase. The bar charts indicate the adjusted ReHo values at the peak voxel of the aIPS/SPL. The error bar corresponds to a 90% confidence interval. (B) FC maps. For ReHo-seeded (aIPS/SPL) FC between-phase comparisons, hypoconnectivity in the aIPS-bilateral posterior insula and -right postcentral gyrus FCs are observed during the MENS phase in the PDM group. Blue regions are associated with either decreased ReHo or decreased FC. Significance thresholded at the uncorrected voxel level p = 0.005 followed by the FWE-corrected cluster level p = 0.05. *Denotes the contrast(s) that are significant in between-phase comparisons. For abbreviations, see the legend of Fig. 1.
Mentions: For the interaction effect, the between-group comparison of phase differences revealed significant greater ReHo alterations in the left declive and right orbitofrontal cortex (OFC), and lesser ReHo alterations in the left aIPS/SPL in the PDM group (Table 1; Fig. 1A). No main effects of group and phase were noted. For the between-group planned contrast, there was no difference during the MENS phase. The bilateral ventromedial prefrontal cortex (vmPFC, BA10) of DMN network, exhibited a trait-related reduction of ReHo during the POV phase in the PDM group vs. CON group (Table 1; Figs 1A and S1). For the between-phase planned contrast, PDM group demonstrated state-related reduction of the ReHo in the anterior part of the left intraparietal sulcus (aIPS, BA40) and left superior parietal lobe (SPL) of DAN network during the MENS phase vs. the POV phase (Table 1; Figs 2A and S1). The CON group demonstrated state-related reduction of ReHo in the left declive during the MENS phase vs. the POV phase.

Bottom Line: PDM women exhibited a trait-related ReHo reduction in the ventromedial prefrontal cortex, part of the default mode network (DMN), during the periovulatory phase.The altered DMN-sensorimotor network may be an ongoing representation of cumulative menstrual pain.The findings indicate that women with long-term PDM may develop adaptive neuroplasticity and functional reorganization with a network shift from affective processing of salience to the cognitive modulation of pain.

View Article: PubMed Central - PubMed

Affiliation: Institute of Brain Science, School of Medicine, National Yang-Ming University, Taipei, Taiwan.

ABSTRACT
Primary dysmenorrhea (PDM) is the most prevalent gynecological problem. Many key brain systems are engaged in pain processing. In light of dynamic communication within and between systems (or networks) in shaping pain experience and behavior, the intra-regional functional connectivity (FC) in the hub regions of the systems may be altered and the functional interactions in terms of inter-regional FCs among the networks may be reorganized to cope with the repeated stress of menstrual pain in PDM. Forty-six otherwise healthy PDM subjects and 49 age-matched, healthy female control subjects were enrolled. Intra- and inter-regional FC were assessed using regional homogeneity (ReHo) and ReHo-seeded FC analyses, respectively. PDM women exhibited a trait-related ReHo reduction in the ventromedial prefrontal cortex, part of the default mode network (DMN), during the periovulatory phase. The trait-related hypoconnectivity of DMN-salience network and hyperconnectivity of DMN-executive control network across the menstrual cycle featured a dynamic transition from affective processing of pain salience to cognitive modulation. The altered DMN-sensorimotor network may be an ongoing representation of cumulative menstrual pain. The findings indicate that women with long-term PDM may develop adaptive neuroplasticity and functional reorganization with a network shift from affective processing of salience to the cognitive modulation of pain.

No MeSH data available.


Related in: MedlinePlus