Mathematical Modeling for Neuropathic Pain: Bayesian Linear Regression and Self-Organizing Maps Applied to Carpal Tunnel Syndrome

A better understanding of the connection between risk factors associated with pain andfunction may assist therapists in optimizing therapeutic programs. This study applied mathematicalmodeling to analyze the relationship of psychological, psychophysical, and motor variables with pain,function, and symptom severity using Bayesian linear regressions (BLR) and self-organizing maps(SOMs) in carpal tunnel syndrome (CTS). The novelty of this work was a transfer of the symmetrymathematical background to a neuropathic pain condition, whose symptoms can be either unilateralor bilateral. Duration of symptoms, pain intensity, function, symptom severity, depressive levels,pinch tip grip force, and pressure pain thresholds (PPTs) over the ulnar, radial, and median nervetrunks, the cervical spine, the carpal tunnel, and the tibialis anterior were collected in 208 womensuffering from CTS. The first BLR model revealed that symptom severity, PPTs over the radialnerve, and function had significant correlations with pain intensity. The second BLR showed thatsymptom severity, depressive levels, pain intensity, and years with pain were associated with function.The third model demonstrated that pain intensity and function were associated with symptom severity.The SOMs visualized these correlations among variables, i.e., clinical, psychophysical, and physical,and identified a subgroup of women with CTS exhibiting worse clinical features, higher pressuresensitivity, and lower pinch tip grip force. Therefore, the application of mathematical modelingidentified some interactions among the intensity of pain, function, and symptom severity in womenwith CTS

Mother-Child Bond through Feeding: A Prospective Study including Neuroticism, Pregnancy Worries and Post-Traumatic Symptomatology

Post-traumatic stress disorder (PTSD) is a common postpartum problem and influences maternal bonding with the infant. However, the relationship between this disorder, maternal personality, and the infant’s emotional state during feeding is not clear. The aim of the present study was to explore the contribution of neuroticism on the infant’s emotional state during feeding, by attending to the mediating role of postpartum PTSD (P-PTSD) symptoms and the moderating role of worries during pregnancy. A prospective design study was developed with 120 women with a low pregnancy risk. They responded to a questionnaire assessing maternal personality (first trimester), worries during pregnancy (third trimester), P-PTSD symptoms, and mother-baby bonding (4 months postpartum). The results showed a positive association among neuroticism, infant irritability during feeding, and P-PTSD symptoms, suggesting the latter plays a mediating role in the relationship between neuroticism and infant irritability (B = 0.102, standard error (SE) = 0.03, 95% coefficient interval (CI) [0.038, 0.176]). Excessive worries, related to coping with infant care, played a moderating role between neuroticism and P-PTSD symptoms (B = 0.413, SE = 0.084, p = 0.006, 95% CI [0.245, 0.581]). This relationship was interfered with by depressive symptoms in the first trimester (covariate) (B = 1.820, SE = 0.420, p = 0.016, ci [2.314, 0.251]). This study contributes to a better understanding of the role of neuroticism as an influential factor in the occurrence of P-PTSD symptoms, and in the impairment of infant bonding during feeding. Paying attention to these factors may favor the development of psychological support programs for mothers, with the aim of strengthening the bond with their child