Does One Measure Fit All? The Role of Experimentally Induced Pain Tests in the Assessment of Women with Provoked Vestibular Pain.

Purpose: A diagnostic algorithm was recently suggested to address the underlying mechanisms of provoked-vestibulodynia (PVD). It delineates four subgroups (Hormonal-associated, Augmented-anterior, Hymenal-associated and Hypertonicity-associated), each manifesting a distinctive vulvar pain-hypersensitivity regarding location (circumferential vs posterior-only vestibulodynia) and pain characteristics. We aimed to explore the significance of various experimentally induced vulvar pain measures in the manifestation of pain hypersensitivity in each subgroup. Methods: Women with PVD (n = 113) and 43 controls reported pain intensity provoked during vaginal penetration and tampon insertion. Vestibular tenderness (anterior and posterior) was assessed by Q-tip test, and pressure stimulation delivered to the puborectalis assessed muscle tenderness. Pain thresholds were measured using a vulvar-algesiometer. These measures were compared between patients and controls and among the PVD subgroups. Correlations between the clinical and experimentally induced-pain measures were assessed. Finally, to address whether the association between experimentally induced-pain measures and dyspareunia severity is mediated by hypertonicity, the conditional indirect effect was analyzed in each subgroup. Results: Compared to controls, augmented vulvar pain-hypersensitivity and hypertonicity were observed among patients (p < 0.001). ANOVA revealed no subgroup differences in dyspareunia severity. Nevertheless, some experimentally induced-pain measures were differently correlated with dyspareunia intensity in each subgroup, allowing discrimination of subgroups according to the unique findings of vulvar pain-hypersensitivity. The degree of pelvic floor muscle-hypertonicity mediated the association between vulvar pain-hypersensitivity and dyspareunia severity, emphasizing the key role of hypertonicity in distinguishing between subgroups. Conclusion: The findings offer more evidence of variations among PVD subtypes, demonstrating that insertional dyspareunia may originate from dissimilar alterations in the mucosal and muscular tissues. The results also emphasize the significance of utilizing a wide battery of tests to capture different experimentally induced-pain measures, revealing the unique patterns of vulvar pain-hypersensitivity in each subgroup.

The role of self-criticism and self-compassion in the development of PTSD among midwives.

OBJECTIVE: Healthcare providers might develop emotional distress following direct and indirect exposure to traumatic events. Evidence shows that midwives, who care for women in complicated situations, are often exposed to circumstances that have a potential to lead to a variety of psychological reactions, including symptoms identified with post-traumatic stress disorder (PTSD). Nevertheless, the positive-healthy context in which childbirth is mainly perceived raises questions regarding the protective role of personality traits, which are related to processing methods of stress and pain, in the development of PTSD among this unique population. This study aimed to explore the associations between traits such as self-compassion, self-criticism, resilience, cognitive thinking, and pain catastrophizing and PTSD symptoms among Israeli midwives. SETTING: Using a quantitative cross-sectional study,123 midwives from ten hospitals in Israel anonymously reported their characteristics and severity of stress and/or PTSD symptoms by filling out the Psychopathy Checklist questionnaire. Analysis of personality traits was performed via the following questionnaires: Self-Compassion Scale - Short Form, Depressive Experiences Questionnaire - Self Criticism, and the Connor-Davidson Resilience Scale. Additionally, we measured the level of catastrophizing pain by employing the Pain Catastrophizing Scale questionnaire. FINDINGS: Most of the midwives reported existing post-trauma symptoms, among them 11.38% had been diagnosed with PTSD. Severity of the PTSD correlated with their self-criticism and the pain catastrophizing rates. Additional examination of the involvement of personality traits showed that midwives with high self-criticism, low mental resilience, besides a high rate of pain catastrophizing, were more vulnerable to developing PTSD. CONCLUSIONS: The findings can help to refine the understanding regarding the involvement of midwives' personality characteristics in the process of PTSD onset. Vulnerable midwives have been identified as those at risk to develop PTSD symptoms. IMPLICATIONS FOR PRACTICE: The clinical significance of these insights is to promote the ability to identify midwives who are at risk to develop PTSD. Furthermore, this information might help to produce training programs and a support network to empower self-compassion and mental resilience, and to minimize self-criticism in order establish a support network, which would help to deal with the difficult experiences they face at work.

Dispositional and situational personal features and acute post-collision head and neck pain: Double mediation of pain catastrophizing and pain sensitivity.

Pain variability can be partially attributed to psycho-cognitive features involved in its processing. However, accumulating research suggests that simple linear correlation between situational and dispositional factors may not be sufficiently explanatory, with some positing a role for mediating influences. In addition, acute pain processing studies generally focus on a post-operative model with less attention provided to post-traumatic injury. As such, this study aimed to investigate a more comprehensive pain processing model that included direct and indirect associations between acute pain intensity in the head and neck, pain catastrophizing (using pain catastrophizing scale (PCS)), and pain sensitivity (using the pain sensitivity questionnaire (PSQ)), among 239 patients with post-motor vehicle collision pain. The effect of personality traits (using Ten Items Personality Inventory (TIPI)) and emotional status (using Hospital Anxiety and Depression Scale (HADS) and Perceived Stress Scale (PSS)) on that model was examined as well. To this end, three Structural Equation Modeling (SEM) analyses were conducted. Overall, the data had good fit to all the models, with only PSQ found to have a direct correlation with acute pain intensity. The SEM analyses conversely revealed several mediations. Specifically, that: first, PSQ fully mediated the relationship between PCS and pain intensity; second, PCS and PSQ together fully mediated the relationship between conscientiousness (personality trait) and pain intensity; and finally, emotional status had direct and indirect links with PSQ and pain intensity. In conclusion, these models suggest that during the acute post-collision phase, pain sensitivity intermediates between emotional states and personality traits, partially via elevated pain catastrophizing thoughts.

The role of itch and pain modulation in the prediction of phototherapy outcomes: a prospective cohort study.

OBJECTIVES: Ability to predict which chronic itch patients will benefit from particular treatments is a challenge. Common features in itch and pain in respect to sensory elicitation, and mechanisms of processing including sensitization and inhibition at the peripheral and central levels, may serve to understand variability in treatment outcomes. As such this study aimed to explore whether phototherapy outcomes can be predicted by psychophysical parameters of pain and itch modulatory processing. METHODS: Prospective cohort study on chronic-itch patients (n = 44) assessed before 20 treatments of NB UVB. Level of itch and pain reduction following painful stimulation (reflecting the 'pain inhibits pain' phenomenon) used to assess the top-down modulation response efficacy. Magnitude of Conditioned Pain Modulation (CPM) for itch (CPM-itch) and for pain (CPM-pain) (reflecting inhibition) and magnitude of temporal summation (TS) of pain (reflecting ascending facilitation pathways) assessed to predict treatment effect. RESULTS: Higher improvement of itch symptoms following phototherapy was correlated with more efficient CPM-itch (r = 0.62, p < .001), but not magnitude of CPM-pain or level of temporal summation. DISCUSSION: Findings emphasize the role of descending inhibition pathways in determining phototherapy efficacy in chronic itch patients. Such an evaluation-based approach may contribute to better patient selection for phototherapy improving patients' disease outcomes.

Head- and neck-related symptoms post-motor vehicle collision (MVC): Separate entities or two-sides of the same coin?

BACKGROUND AND AIM: Although post-motor vehicle collision (MVC) pain and symptoms are largely convergent among those with mild traumatic brain injury (mTBI) and whiplash associated disorder (WAD), and patients oftentimes report initial neck and head complaints, the clinical picture of mTBI and WAD has been primarily studied as separate conditions which may result in an incomplete clinical picture. As such, this study was conducted to explore the role of pain and post-traumatic psychological features in explaining both head and neck-related symptom variability in a cohort of post-collision patients. This is with the goal of disentangling if contributory factors are uniquely related to each diagnosis, or are shared between the two. METHODS: Patients recruited in the very early acute phase (<72 h) returned for clinical and psychological assessment at 6 months post-accident. In order to determine which factors were unique and which ones were overlapping the same potential contributors: mean head pain, mean neck pain, female gender, number of post-collision painful body areas, PTSD, and depression were included in the regression models for both neck disability index (NDI) and Rivermead post-concussion symptoms questionnaire (RPQ). RESULTS: Of 223 recruited participants, 70 returned for a follow-up visit (age range 18-64, mean(SD) 37.6 (11.9), 29F). This cohort primarily met the criteria for mTBI, but also fulfilled the criteria for whiplash, reinforcing the duality of injury presentation. Correlations existed between the NDI and RPQ scores (Spearman's ρ=0.66, p<0.001), however overlap was only partial. Regression analysis showed that after the removal of area-of-injury pain neck related disability (r = 0.80, p <0.001) was explained solely by number of painful body areas (ß=0.52, p <0.001). In contrast, post-concussion syndrome symptoms (r = 0.86, p<0.001) are influenced by clinical pain, painful body areas (ß=0.31, p = 0.0026), female gender (ß=0.19, p = 0.0053), and psychological factors of depression (ß=0.31, p = 0.0028) and PTSD symptoms (ß=0.36, p = 0.0013). CONCLUSIONS: It seems that while mechanisms of neck- and head-related symptoms in post-collision patients do share a common explanatory feature, of residual body pain, they are not entirely overlapping. In that psychological factors influence post-concussion syndrome symptoms, but not post-whiplash neck disability.

Explaining very early acute mild traumatic brain injury after motor vehicle collision pain variability: additive value of pain sensitivity questionnaire.

INTRODUCTION AND OBJECTIVES: Chronic pain is a common postcollision consequence. Wherein, a clearer understanding of acute pain can help stem the acute-to-chronic pain transition. However, the variability of acute pain is only partially explained by psychophysical pain characteristics as measured by quantitative sensory testing. The Pain Sensitivity Questionnaire (PSQ) may reflect inherent psychocognitive representations of patient's sensitivity and thus may reveal less-explored pain dimensions. In the vein of the biopsychosocial approach, this study aimed to explore whether PSQ holds additive value in explaining head and neck pain reports in very early acute-stage mild traumatic brain injury (mTBI) after collision, above the use of psychophysical assessment. METHODS: Study cohort (n = 130) consisted of mTBI patients (age range 19-66, 57 F) after accident with area-of-injury pain of at least 20 on the day of testing (mean pain 58.4 ± 21.6, range 20-100 Numerical Pain Scale) who underwent clinical, psychophysical, and pain-related psychological assessment within 72-hour after injury. RESULTS: Pain Sensitivity Questionnaire scores were significantly correlated with acute clinical, psychophysical, and pain-related psychological measures. Regression model (R 2 = 0.241, P < 0.001) showed that, together, age, sex, high PSQ, enhanced temporal summation, and less-efficient conditioned pain modulation explained head and neck pain variance. This model demonstrated that the strongest contribution to degree of postinjury pain was independently explained by PSQ (ß = 0.32) and then pressure pain threshold-conditioned pain modulation (ß = -0.25). CONCLUSION: Appraisal of cognitive daily-pain representations, by way of memory and imagination, provides an additional important dispositional facet to explain the variability in the acute mTBI postcollision clinical pain experience, above assessing nociceptive responsiveness to experimentally induced pain.

Vestibular Anatomic Localization of Pain Sensitivity in Women with Insertional Dyspareunia: A Different Approach to Address the Variability of Painful Intercourse.

The pathophysiology underlying painful intercourse is challenging due to variability in manifestations of vulvar pain hypersensitivity. This study aimed to address whether the anatomic location of vestibular-provoked pain is associated with specific, possible causes for insertional dyspareunia. Women (n = 113) were assessed for "anterior" and "posterior" provoked vestibular pain based on vestibular tenderness location evoked by a Q-tip test. Pain evoked during vaginal intercourse, pain evoked by deep muscle palpation, and the severity of pelvic floor muscles hypertonicity were assessed. The role of potential confounders (vestibular atrophy, umbilical pain hypersensitivity, hyper-tonus of pelvic floor muscles and presence of a constricting hymenal-ring) was analyzed to define whether distinctive subgroups exist. Q-tip stimulation provoked posterior vestibular tenderness in all participants (6.20 ± 1.9). However, 41 patients also demonstrated anterior vestibular pain hypersensitivity (5.24 ± 1.5). This group (circumferential vestibular tenderness), presented with either vestibular atrophy associated with hormonal contraception use (n = 21), or augmented tactile umbilical-hypersensitivity (n = 20). The posterior-only vestibular tenderness group included either women with a constricting hymenal-ring (n = 37) or with pelvic floor hypertonicity (n = 35). Interestingly, pain evoked during intercourse did not differ between groups. Linear regression analyses revealed augmented coital pain experience, umbilical-hypersensitivity and vestibular atrophy predicted enhanced pain hypersensitivity evoked at the anterior, but not at the posterior vestibule (R = 0.497, p < 0.001). Distinguishing tactile hypersensitivity in anterior and posterior vestibule and recognition of additional nociceptive markers can lead to clinical subgrouping.

Matching actual treatment with patient administration-route-preference improves analgesic response among acute low back pain patients-a randomized prospective trial.

BACKGROUND: Accommodating a patient's treatment preference has been reported to promote greater responsiveness and better clinical outcomes. The effect of administration route preference (ARP) on the individual analgesic response has not been extensively examined to date. This study aimed to investigate whether ARP-matched treatment, i.e., individualized intramuscular (IM) or oral (PO) analgesic administration according to patient choice, would increase the analgesic effect. METHODS: In this prospective randomized study, we collected 38 patients with acute low back pain (aLBP) presenting at the emergency room of the Galilee Medical Center (Naharia, Israel) and asked them to report their ARP for analgesics. Regardless of their reported preference, they received either PO or IM diclofenac according to the treating physician's preference. Pain intensity was self-reported using the numeric pain score (NPS) before and during the first hour after drug administration. RESULTS: Both groups receiving PO or IM administration reported similar initial pain on admission, (NPS 8.63 ± 1.5 and 8.74 ± 1.6, respectively) and the same magnitude of pain reduction. However, patients who received the drug in their desired route (oral or injection) had a significantly greater reduction in pain levels (4.05 ± 2.8) as compared with patients who received the undesired route (2.08 ± 1.8), p < 0.05. CONCLUSIONS: These findings support the hypothesis that individualized ARP-matched treatment in aLBP improves therapeutic outcomes, although further studies with larger cohorts are needed.

Enhanced Itch Intensity Is Associated with Less Efficient Descending Inhibition Processing for Itch But Not Pain Attenuation in Chronic Dermatology Patients.

OBJECTIVES: The study aims were 1) to investigate the direction of mutual inhibitory pathways on itch intensity by utilizing conditioned pain modulation paradigms for pain and itch attenuation and 2) to explore whether itch severity is affected by the individual pain sensitivity profile, as well as pain scores reported during the tests and the past week. DESIGN: Cross-sectional. SETTING: Testing was conducted at the Department of Dermatology, Rambam Health Care Campus. SUBJECTS: Forty patients suffering from chronic skin disorders associated with itch and treated in the Dermatology Clinic at Rambam Health Care Campus participated in the study. METHODS: Efficacy of descending inhibition was evaluated by two conditioned pain modulation (CPM) paradigms: by pruriception (CPMItch) induced by cold and heat as counterstimuli to inhibit itch intensity and by nociception (CPMPain). Severity and interference of clinical pain were assessed using the Brief Pain Inventory (BPI). RESULTS: Robust CPMItch responses were obtained following the various noxious stimulations. No associations were observed between CPMPain and CPMItch, itch severity, skin disease severity, and clinical pain symptoms. According to the linear regression model, itch severity was independently associated with less efficient CPMItch (B = -0.750, P < 0.001) and more efficient CPMPain (B = 0.031, P = 0.016), which affects itch in opposing manners. CONCLUSIONS: Findings indicate that the intrinsic capacity to inhibit pain and itch by exposure to exogenous noxious stimuli autonomously affects itch intensity in an opposing manner. These findings may shed new light on the mutual mechanistic similarity and dissimilarity between pain and itch and their hierarchy.

Resting blood pressure modulates chest pain intensity in patients with acute myocardial infarction.

INTRODUCTION AND OBJECTIVES: Animal models and human studies show that resting blood pressure (BP) is inversely associated with pain sensitivity. The phenomenon of "hypertension-associated hypoalgesia" was proposed as a possible explanation for the intervariability in pain perception. Given that a portion of patients with acute myocardial infarction (AMI) do not experience significant pain, we used the model of severe cardiac ischemia to explore whether BP affects the intensity of chest pain. METHODS: Patients with AMI admitted to the cardiac intensive care unit with coronary catheterization-proven completely occluded coronary artery were included (n = 67). Resting BP at admission and 5 days after AMI was obtained. Participants reported chest pain intensity and underwent psychophysical evaluation including pain ratings for pressure, heat, and pinprick stimuli as well as temporal summation and conditioned pain modulation paradigms. RESULTS: Patients with lower systolic BP (≤120 mm Hg) vs higher (≥140 mm Hg) reported higher chest pain scores at symptom onset (82.3 vs 61.7, P = 0.048) and during peak AMI (82.8 vs 57.5, P = 0.019). Higher pain ratings in response to pinprick stimulus were associated with lower BP at admission (analysis of variance P = 0.036). Patients with hypertension demonstrated lower pain sensitivity in response to pressure stimulation (531.7 ± 158.9 kPa/s vs 429.1 ± 197.4). No significant associations were observed between BP and the other assessed psychophysical measures. CONCLUSION: Study findings reinforce the phenomenon of hypertension-associated hypoalgesia through characterization of the association between BP and clinical pain experiences at onset and during AMI in a model of acute clinical pain.

How Does Myofascial Physical Therapy Attenuate Pain in Chronic Pelvic Pain Syndrome?

Background: Chronic pelvic pain syndrome (CPPS) is a multifactorial disorder comprising structural and functional muscular abnormalities, a dysfunctional pain system, and psychological distress. Myofascial physical Therapy (MPT) that is targeted at improving pelvic muscle functioning is considered a first line nonpharmacological treatment for CPPS, although the precise mechanisms that lead to symptoms alleviation have not yet been elucidated. Purpose: This longitudinal study aimed to examine the local and systemic effects of MPT intervention, including biopsychophysiological processes, among CPPS patients. Methods: The study included 50 CPPS women. Morphologic assessment of the levator ani and quantitative sensory testing of the pain system were applied alongside with evaluation of pain-related psychological factors using designated questionnaires. All measures were evaluated both before and after MPT in 39 patients. The long-term effects of MPT were evaluated by clinical pain reports obtained at 3 and 9 months following MPT that were compared with a nontreated group of 11 untreated CPPS women. Results: Along with an improvement in the clinical pain intensity (p = 0.001) and sensitivity to experimental pain tests (p = 0.001) following MPT, the results also indicate that MPT has anatomical, psychological, and social therapeutic effects (p = 0.04; p = 0.001; p = 0.01, respectively). Furthermore, clinical pain evaluation at 3 and 9 months after MPT revealed a significant improvement in women who received treatment (p = 0.001). Conclusions: The findings of this pilot study suggest multisystemic (direct and indirect anatomical, neurophysiological, and psychological) effects of MPT on the multifactorial pain disorder of CPPS and therefore place MPT as a mechanism-based intervention.

"Death Lay Here on the Sofa": Reflections of Young Adults on Their Experience as Caregivers of Parents Who Died of Cancer at Home.

The prevalence of terminally ill patients, who die at home, is increasing. The aim of this study was to address the meaning of being young adults, who were the caregivers of their dying parents. In-depth, semistructured interviews were conducted with 14 Israeli Jewish young adults, who had been the primary caregivers for parents who had cancer and eventually died at home. Three themes emerged: (a) "I was Chosen and was led into that situation": modes of taking on and performing the role of a caregiver, (b) "My life was on hold": the experience of performing the caregiving role, and (c) "I underwent . . . the real school of life": caring for the dying parent as an imprint on self-development. Participants integrated compassionate caring into their identity, reflecting an empowering encounter of young carers with their dying parents as a process of growth in the face of harsh, stressful experiences.

Psychophysic-psychological dichotomy in very early acute mTBI pain: A prospective study.

OBJECTIVE: To characterize the pain-related somatosensory and psychological presentation of very early acute patients with a mild traumatic brain injury (mTBI). METHODS: Patients with an mTBI participated in a prospective observational study undergoing clinical, psychophysic, and psychological assessment within 72 hours after the accident. Healthy controls underwent similar protocol. RESULTS: One hundred acute patients with an mTBI (age 36 ± 12.5 [SD] years, range 19-67 years, 42 women) and 80 healthy controls (age 43 ± 14.3 years, range 24-74 years, 40 women) participated. Patients with an mTBI demonstrated a pronociceptive psychophysic response in most tests such as less efficient pressure-pain threshold-conditioned pain modulation (0.19 ±0.19±.09 vs. 0.91±.10 kg, p < 0.001) and lower temperature needed to elicit a Pain50 response (44.72 ± 0.26°C vs 46.41 ± 0.30°C, p < 0.001). Their psychophysic findings correlated with clinical pain measures, e.g., Pain50 temperature and mean head (r = -0.21, p = 0.045) and neck (r = -0.26, p = 0.011) pain. The pain-catastrophizing magnification subscale was the only psychological variable to show a difference from the controls, while no significant correlations were found between any psychological measures and the clinical or psychophysic pain measures. CONCLUSIONS: There appears to be a dichotomy between somatosensory and psychological findings in the very early acute post-mTBI stage; while the first is altered and is associated with the clinical picture, the second is unchanged. In the context of the ongoing debate on the pathophysiologic nature of the post-mTBI syndrome, our findings support its "physical" basis, free of mental influence, at least in the short time window after the injury.

Negative Illness Perceptions are Associated With a Pronociceptive Modulation Profile and Augmented Pelvic Pain.

OBJECTIVES: A patient's personal interpretations of a health threat or "illness perceptions" (IPs) are associated with their clinical outcomes. This study explored whether IPs are associated with pain severity and ability to modulate pain in women with chronic pelvic pain syndrome (CPPS), as well as the predictive value of IPs on myofascial manual therapy (MMT) success. MATERIALS AND METHODS: Illness Perceptions Questionnaire-Revised (IPQ-R), mechanical and heat pain thresholds, mechanical temporal summation, and conditioned pain modulation (CPM) were evaluated in CPPS patients (n=39) before, and 3 months after MMT. CPPS severity was obtained by the Brief Pain Inventory (BPI). RESULTS: Stronger perceptions of illness chronicity were correlated with less efficient CPM (r=0.488, P=0.002) and increased mechanical pain intensity (r=0.405, P=0.02). Lower perceptions of control over illness were associated with enhanced mechanical temporal summation (r=0.399, P=0.01). Higher BPI scores were correlated with emotional representations (negative emotional representations) and severe consequences due to CPPS. Regression analyses revealed that negative IPs predict less efficient MMT. DISCUSSION: Cognitive representations play a unique role in CPPS expression and MMT outcomes. The interplay between negative IPs and a pronociceptive modulation profile, mediated by enhanced facilitatory and reduced inhibitory processes, may be involved in the manifestation of CPPS.

Trauma, attachment style, and somatization: a study of women with dyspareunia and women survivors of sexual abuse.

BACKGROUND: Evidence points toward shared characteristics between female survivors of sexual abuse and women with dyspareunia. This study explored, for the first time, similarities and differences between women who were exposed to sexual abuse to those with dyspareunia, in order to examine whether insecure attachment styles and high somatization level are associated with trauma among women with dyspareunia. METHODS: Attachment styles were explored using the Experience in Close Relationships Scale to reflect participants' levels of anxiety and avoidance. Somatization was assessed using the Brief Symptom Inventory focusing on the frequency of painful and non-painful bodily complaints. Trauma was categorized into three levels: sexual trauma, nonsexual trauma, and no trauma. RESULTS: Sexually abused (SA) women (n = 21) compared to women with dyspareunia (dys) (n = 44) exhibited insecure attachment styles, as expressed by high levels of avoidance (SA 4.10 ± 0.99 vs. dys 3.08 ± 1.04, t(61) = 2.66, p = .01) and anxiety (SA 4.29 ± 1.22 vs. dys 3.49 ± 1.04, t(61) = 3.61, p = .001), and higher somatization (21.00 ± 8.25 vs. 13.07 ± 7.57, t(59) = 3.63, p = .001). Attachment and somatization level did not differ significantly between women with dyspareunia without trauma to those with nonsexual trauma. CONCLUSIONS: Our findings emphasized the unique role of sexual trauma as a contributing factor to the augmentation of perceived bodily symptoms and to insecure attachment style. This illuminates the importance of disclosing previous sexual abuse history among women with dyspareunia.

A common pronociceptive pain modulation profile typifying subgroups of chronic pelvic pain syndromes is interrelated with enhanced clinical pain.

Provoked vestibulodynia (PVD) and painful bladder syndrome (PBS), subgroups of chronic pelvic pain syndromes (CPPS), are considered to share common biophysiological peripheral mechanisms. In addition, indications of a pronociceptive pain profile coexisting with psychological vulnerability suggest common dysfunctional pain processing and pain modulation in these 2 subgroups of CPPS. We therefore aimed at comparing the pain profile and psychological traits of patients with PVD and PBS to see whether the pain profile contributes to intersubject variability of clinical pain symptoms. Patients with PVD (n = 18) and PBS (n = 21) were compared with healthy controls (n = 20) in their responses to (1) pain psychophysical tests applied to both referred (suprapubis) and remote (hand) body areas and (2) pain-related psychological factors (pain catastrophizing, depression, anxiety, and somatization). We found a similar pronociceptive pain profile in the 2 subgroups of CPPS-enhanced facilitation (ie, hyperalgesia in the referred body area [P < 0.001]) and inefficient inhibition (ie, reduced conditioned pain modulation [P < 0.001] that were associated with both enhanced pain ratings evoked during trigger point examination [P < 0.037]) and higher Brief Pain Inventory ratings (P = 0.002). The latter was also correlated with pain catastrophizing (r = 0.504, P = 0.001) and depression symptoms (r = 0.361, P = 0.024). The findings suggest common mechanisms underlying a dysfunctional nociceptive system in both PVD and PBS. The intersubject variability in the level of dysfunction and its association with disease severity recommends a personalized pain treatment that may alleviate daily pain and dysfunction in patients with CPPS.

Efficient conditioned pain modulation despite pain persistence in painful diabetic neuropathy.

INTRODUCTION: Alleviation of pain, by either medical or surgical therapy, is accompanied by transition from less efficient, or pro-nociceptive, to efficient conditioned pain modulation (CPM). Spontaneous decrease or resolution of pain with disease progression is reported for some patients with painful diabetic neuropathy (PDN). OBJECTIVES: To explore whether CPM changes similarly in parallel to spontaneous resolution of pain in PDN patients. METHODS: In this cross-sectional study, thirty-three patients with PDN underwent psychophysical assessment of pain modulation on the forearm, remote from the clinical pain. RESULTS: Pain duration was not correlated with neuropathic pain intensity, yet, it correlated with CPM efficiency; patients with longer pain duration had same pain level, but more efficient CPM than those with short-pain duration (ρ = -0.417; P = 0.025, Spearman correlation). Patients with pain more than 2 years (median split) expressed efficient CPM that was not different from that of healthy controls. These patients also had lower temporal summation of pain than the short-pain duration patients group (P < 0.05). The 2 patient groups did not differ in clinical pain characteristics or use of analgesics. CONCLUSION: Pro-nociception, expressed by less efficient CPM and high temporal summation that usually accompanies clinical painful conditions, seems to "normalize" with chronicity of the pain syndrome. This is despite continuing pain, suggesting that pro-nociceptivity in pain syndromes is multifactorial. Because the pain modulation profile affects success of therapy, this suggests that different drugs might express different efficacy pending on duration of the pain in patients with PDN.

The Effectiveness and Safety of High-Dose Colistin: Prospective Cohort Study.

BACKGROUND: Optimizing colistin dosing should translate to improved patient outcomes. METHODS: We used data from 2 prospective cohort studies performed between 2006 and 2009 and between 2012 and 2015. In the latter period, a new policy of high-dose colistin (9 million international units [MIU] loading dose followed by 9 MIU daily for normal renal function) was introduced in 2 participating hospitals. We included adult inpatients with invasive infections caused by carbapenem-resistant gram-negative bacteria treated with colistin. Our primary exposure variable was colistin dose, dichotomized to high-dose vs other regimens. The primary outcome was 28-day mortality. We generated a propensity score for high-dose colistin and conducted propensity-adjusted multivariable and matched-cohort analyses for mortality. RESULTS: Of 529 consecutive patients fulfilling inclusion criteria, 144 were treated with high-dose colistin and 385 with lower-dose colistin regimens. The median daily dose in the high-dose group was 9 MIU (interquartile range [IQR], 9-9) vs 4 MIU (IQR, 3-6) with other regimens. There were 50 of 144 (34.7%) deaths with high-dose colistin vs 165 of 385 (42.9%) with low-dose colistin (P = .1). The propensity-adjusted odds ratio (OR) for mortality was 1.07 (95% confidence interval [CI], .63-1.83) for high-dose colistin. Similar results were obtained when using the study period as the exposure variable, in the subgroup of bacteremic patients (n = 207) and in the propensity-matched cohort (OR, 1.11 [95% CI, .67-1.82]). Nephrotoxicity (RIFLE injury or higher; OR, 2.12 [95% CI, 1.29-3.48]; n = 396) and seizures were significantly more common with high-dose colistin. CONCLUSIONS: In a large cohort, we found no association between high colistin dosing and all-cause mortality. High dosing was associated with more nephrotoxicity.

Antecedents and consequences of emotional work in midwifery: A prospective field study.

BACKGROUND: Given the effort made in today's birthing rooms to increase women's childbirth satisfaction, special attention is directed to midwives' expressions of authenticity (namely to display emotions that he/she actually experience) in birth encounters. OBJECTIVES: To explore antecedents and consequences of emotional work strategies expressed in a specific birth encounter, to (1) understand the specific factors in a midwife-birthing woman encounter, namely parity (whether or not it is a first birth), use of epidural analgesia, induction of labor, and instrumental birth that stimulate the use of deep or surface acting; (2) test the link between emotional work strategies and birthing experience, and (3) assess whether associations between the midwife's choice of strategy (deep acting or surface acting), and the woman's childbirth experience is moderated by the birthing woman's perception of the midwife's emotional work strategies. DESIGN: A prospective-correlational field study. PARTICIPANTS: 104 births, selected by a convenience sampling method-including 24 midwives and 104 birthing women, in one birthing room in Israel. METHODS: Data were collected by validated questionnaires at two time points: immediately after labor and 48h after labor. RESULTS: Linear mixed model analyses revealed that of the antecedents to emotional work strategies, epidural analgesia was negatively associated with surface acting (ß=-.301, p<.05); primigravida was significantly associated with deep acting (ß=611, p<.01) and negatively associated with surface acting (ß=-.433, p<.01); induction of birth was not associated with deep or surface acting (p>.05), and instrumental birth was significantly associated with deep acting (ß=-.590, p<.05) and positively associated with surface acting (ß=.444, p<.05). Regarding consequences of emotional work strategies, the midwife's engagement with surface acting was negatively related to the woman's birthing experience (ß=-.155, p<.05), whereas the relationship between midwife's engagement in deep acting and the woman's satisfaction also depended on the latter's perception that the midwife had engaged in deep acting (ß=-.096, p<.05). CONCLUSIONS: The midwife-birthing woman encounter is becoming globally significant for improving childbirth outcomes. Therefore, these findings offer empirical support for the importance of the midwife's expression of authenticity toward the birthing woman in improving her childbirth experience, especially when the woman perceives the midwife's emotional work strategy accurately. Also noteworthy are the aforementioned conditions that shape the midwife's engagement in deep acting or surface acting, with important recommendations to improve women's childbirth experiences.

A Longitudinal Study to Evaluate Pregnancy-Induced Endogenous Analgesia and Pain Modulation.

BACKGROUND AND OBJECTIVES: The phenomenon of pregnancy-induced analgesia has been demonstrated in animal models but less consistently in human studies. This study aimed to assess endogenous pain modulation, evaluating inhibitory and excitatory pain pathways, over the course of pregnancy and postpartum. METHODS: Healthy pregnant women were approached for participation in this prospective multicenter cohort study. Conditioned pain modulation (CPM), mechanical temporal summation (mTS), and temperature that induced pain 6 out of 10 (pain-6) were assessed toward the end of each trimester of pregnancy (8-12, 18-22, and 36 weeks) and at 6 to 12 weeks postpartum. To assess how pregnancy affects CPM, mTS, and pain-6, a mixed-effects analysis of variance was performed. RESULTS: Thirty-three pregnant women were enrolled. Pregnancy did not significantly impact CPM (F3,39 = 0.30, P = 0.83, partial η = 0.02), and there was no significant difference between CPM scores in the third trimester compared with postpartum. The mTS scores and pain-6 ratings were also not significantly changed by pregnancy (F3,42 = 1.20, P = 0.32, partial η = 0.08; and F3,42 = 1.90, P = 0.14, partial η = 0.12, respectively). CONCLUSIONS: This is the first study to assess CPM and mTS changes in pregnancy and postpartum. Endogenous pain modulation evaluating both inhibitory and excitatory pain pathways did not significantly change during pregnancy or postpartum. Future studies are required to determine the magnitude and clinical significance of pregnancy-induced analgesia.