Is pain empathy associated with pain indices and trauma history? A comparison between patients receiving methadone maintenance treatment and healthy controls.

BACKGROUND: To study whether pain empathy and theory of mind (ToM) are related to pain indices and trauma experience, we studied opioid users receiving methadone maintenance treatment (MMT), a population with a history of traumas and a high prevalence of chronic pain. METHODS: MMT patients (n = 53), substance abuse-free, with no impaired cognition (Montreal Cognitive Assessment (MoCA) ≥24), were compared to healthy controls (HC) matched by age and gender (n = 66). All participants were assessed using Reading the Mind in the Eyes (RMET) for ToM, empathy (Interpersonal Reactivity Index [IRI], Empathy Quotient Scale for Adults [EQ60]), and Pain Empathy [PE task]). An algometer was used for pain pressure threshold, and supra-pain threshold was rated using a visual analog scale (VAS). Catastrophizing, McGill pain, Negative life events (NLE), and MoCA questionnaires were administered. Substance abuse was tested in the urine of MMT patients and self-reported by HC. RESULTS: MMT, compared to HC, were less educated with more NLE and a lower RMET (logistic regression). Groups had comparable empathy and pain indices, except for higher supra-threshold VAS rating and catastrophizing in univariate analyses. Pain empathy (PE) correlated with NLE in HC, and in MMT, with catastrophizing, which correlated with NLE, perceived stress, and pain intensity. Higher empathy was observed in 18 participants with a history of sexual abuse (83.3 % belong to the MMT group). CONCLUSIONS: Pain Empathy was found to be associated with personal suffering experience in both groups, as reflected by correlations with NLE in HC and with catastrophizing, which correlates with NLE, stress, and pain intensity, in MMT.

Chromatic Pupilloperimetry Measures Correlate With Visual Acuity and Visual Field Defects in Retinitis Pigmentosa Patients.

Purpose: To evaluate the ability of chromatic pupilloperimetry to identify visual field (VF) defects in patients with retinitis pigmentosa (RP) and to test the correlation between pupilloperimetry impairment and retinal structural and functional measures. Methods: The pupil responses of 10 patients with RP (mean age, 41.3 ± 16.2 years) and 32 healthy age-similar controls (mean age, 50.7 ± 15.5 years) for 54 focal blue and red stimuli presented in a 24-2 VF were recorded. The pupilloperimetry measures were correlated with Humphrey VF mean deviation, best-corrected visual acuity, and ellipsoid zone area. Results: Substantially lower percentage of pupil contraction and maximal pupil contraction velocity (MCV) were recorded in patients with RP throughout the VF in response to blue and red stimuli. The mean absolute deviation (MADEV) in the latency of MCV (LMCV) was significantly larger in patients compared with controls for blue and red stimuli (P = 1.0 × 10-7 and P = 1.0 × 10-6, respectively). The LMCV MADEV differentiated between patients and controls with high specificity and sensitivity (area under the receiver operating characteristic curve, 0.987 and 0.973 for blue and red, respectively). The MADEV of LMCV for blue stimuli correlated with best-corrected visual acuity (ρ = 0.938, P = 5.9 × 10-5) and ellipsoid zone area (ρ = -0.857; P = 0.002). The MADEV of LMCV for red stimuli correlated with Humphrey VF mean deviation (ρ = -0.709; P = 0.022). Minimizing the test to 15 targets maintained a diagnosis of retinal damage in patients with RP with high sensitivity and specificity (area under the receiver operating characteristic curve, 0.927). Conclusions: The chromatic pupilloperimetry measures significantly correlated with retinal function and structure in patients with RP at various disease stages. Translational Relevance: Chromatic pupilloperimetry may enable objective assessment of visual field defects and visual acuity in RP.