Evaluation of Stress on Acupuncture with Nano-Etched and Diamond-Like Carbon (DLC) Coating Surface Modifications

The aim of the present study was to investigate the effect of nano-etched surface and diamond-like carbon (DLC) surface acupuncture needles on human pain perception, by finite element method (FEM). Skin models were reconstructed by 3D computer programs. The stress is an important role in acupuncture needle applications for clinical treatment. Many studies have investigated finite element researches for acupuncture; however, few have evaluated a model for acupuncture with and without\ modified surface. The results revealed that abnormal focusing stress was found when acupuncture with nano-etched surface. Moreover, the unbalance stress was found on the top of the skin model in the nano-etched group, the highest stress also appeared in the top region. Acupuncture with nano-etched surface would be an effective means for stimulating skin. These results indicate subtle but significant effects of acupuncture stimulation with nano-etched surface needles, compared to acupuncture with untreated needles in healthy participants.

Sex differences in pain-related behaviors and clinical progression of disease in mouse models of visceral pain

Previous studies have reported sex differences in irritable bowel syndrome (IBS) and inflammatory bowel disease (IBD) patients, including differences in visceral pain perception. Despite this, sex differences in behavioral manifestations of visceral pain and underlying pathology of the gastrointestinal tract have been largely understudied in preclinical research. In this study, we evaluated potential sex differences in spontaneous visceral nociceptive responses, referred abdominal hypersensitivity, disease progression and bowel pathology in mouse models of acute and persistent colon inflammation. Our experiments show that females exhibit more visceral nociceptive responses and referred abdominal hypersensitivity than males in the context of acute but not persistent colon inflammation. We further demonstrate that, following acute and persistent colon inflammation, visceral pain-related behavioral responses in females and males are distinct, with increases in licking of the abdomen only observed in females and increases in abdominal contractions only seen in males. During persistent colon inflammation, males exhibit worse disease progression than females, which is manifested as worse physical appearance and higher weight loss. However, no measurable sex differences were observed in persistent inflammation-induced bowel pathology, stool consistency or fecal blood. Overall, our findings demonstrate that visceral pain-related behaviors and disease progression in the context of acute and persistent colon inflammation are sex-dependent, highlighting the importance of considering sex as a biological variable in future mechanistic studies of visceral pain as well as in the development of diagnostics and therapeutic options for chronic gastrointestinal diseases.

Association of Acute Postoperative Pain and Cigarette Smoking With Cerebrospinal Fluid Levels of Beta-Endorphin and Substance P

Objectives: Cigarette smoking is associated with postoperative pain perception, which might be mediated by beta-endorphin and substance P. These effects on postoperative pain perception have never been investigated in human cerebrospinal fluid (CSF), which reflects biochemical alterations in the brain. Therefore, we investigated the associations among cigarette smoking, postoperative pain, and levels of beta-endorphin and substance P in human CSF.Methods: We recruited 160 Chinese men (80 active smokers and 80 nonsmokers) who underwent lumbar puncture before anterior cruciate ligament reconstruction, and 5-ml CSF samples were collected. Pain visual analog scale (VAS) scores, post-anesthetic recovery duration (PARD), and smoking variables were obtained. CSF levels of beta-endorphin and substance P were measured.Results: Compared to non-smokers, active smokers had significantly higher pain VAS (2.40 ± 0.67 vs. 1.70 ± 0.86, p < 0.001) and PARD scores (9.13 ± 2.11 vs. 7.27 ± 1.35, p = 0.001), lower CSF beta-endorphin (33.76 ± 1.77 vs. 35.66 ± 2.20, p = 0.001) and higher CSF substance P (2,124.46 ± 217.34 vs. 1,817.65 ± 302.14, p < 0.001) levels. Pain VAS scores correlated with PARD in active smokers (r = 0.443, p = 0.001).Conclusions: Cigarette smoking is associated with increased postoperative pain intensity, shown by delayed pain perception, higher pain VAS scores, and lower beta-endorphin and higher substance P levels in the CSF of active smokers. The more extended postoperative pain perception is delayed, the more pain intensity increases.

Gamma Band Oscillations Reflect Sensory and Affective Dimensions of Pain

Pain is a multidimensional process, which can be modulated by emotions; however, the mechanisms underlying this modulation are unknown. We used pictures with different emotional valence (negative, positive, and neutral) as primes and applied electrical painful stimuli as targets to healthy participants. We assessed pain intensity and unpleasantness ratings and recorded electroencephalograms (EEGs). We found that pain unpleasantness and not pain intensity ratings were modulated by emotion, with increased ratings for negative and decreased ratings for positive pictures. We also found two consecutive gamma band oscillations (GBOs) related to pain processing from time frequency analyses of the EEG signals. The early GBO had a cortical distribution contralateral to the painful stimulus and its amplitude was positively correlated with intensity and unpleasantness ratings, but not with prime valence. The late GBO had a centroparietal distribution and its amplitude was larger for negative compared to neutral and positive pictures. The emotional modulation effect (negative vs. positive) of the late GBO amplitude was positively correlated with pain unpleasantness. The early GBO might reflect the overall pain perception, possibly involving the thalamocortical circuit, while the late GBO might be related to the affective dimension of pain and top-down-related processes.

The Comparison of Plasma Cortisol Levels between 0.125% Bupivacaine and 5 mg Continuous Oxycodone in Lower Extremity Orthopedic Surgery

Introduction: Pain is a problem often encountered in postoperative patients. Study has shown after a procedure, 80% patients experience acute pain. This postoperative pain will affect patient’s quality of life therefore necessitating quick and proper treatment. Tissue trauma during surgery will have influence on body system, including endocrine. One of endocrine system response is cortisol secretion. Cortisol levels may be attenuated by bupivacaine and oxycodone. The aim of this study was to determine the efficacy of bupivacaine0,125% and oxycodone 5 mg on pain perception measured by cortisol in patients undergoing orthopedic surgery of the lower limb. Methods: A randomized clinical trial, double-blind study was performed at Mohammad Hoesin General Hospital in Palembang, South Sumatra, from November to May 2021. There were forty samples and divided into two groups (bupivacaine 0,125% and oxycodone 5 mg). Groups were divided by block randomization by computerized random number generator. Blinding were done by making analgesic has the same packages to prevent knowledge of which intervention is being done. Data were analyzed using independent t-test, ANOVA, Mann-Whitney and Chi Square with SPSS version 22.0. Results: There were no statistically significant differences between the two groups on age, gender, body mass index and duration of surgery. In bupivacaine group, cortisol level decreased from 12.94±6.99 µg/dl to 11.32±5.42 µg/dl meanwhile oxycodone group cortisol levels increased from 11.81±8.47 µg/dl to 11.82±7.56 µg/dl. There were no significant difference between two groups relating to cortisol levels. Conclusions: No significant difference was found on administration of bupivacaine 0,125% and oxycodone 5 mg as epidural analgesia on cortisol level in postoperative orthopedic surgery of the lower limb patient.

Precision Medicine in Alzheimer’s Disease: Investigating Comorbid Common Biological Substrates in the Rat Model of Amyloid Beta-Induced Toxicity

Alzheimer’s disease (AD), one of the most widespread neurodegenerative disorder, is a fatal global burden for the elder population. Although many efforts have been made, the search of a curative therapy is still ongoing. Individuating phenotypic traits that might help in investigating treatment response is of growing interest in AD research. AD is a complex pathology characterized by many comorbidities, such as depression and increased susceptibility to pain perception, leading to postulate that these conditions may rely on common biological substrates yet to be determined. In order to investigate those biological determinants to be associable with phenotypic traits, we used the rat model of amyloid beta-induced toxicity. This established model of early phase of AD is obtained by the intracerebroventricular injection of soluble amyloid beta1-42 (Aβ) peptide 7 days before performing experiments. In this model, we have previously reported increased immobility in the forced swimming test, reduced cortical serotonin levels and subtle alterations in the cognitive domain a depressive-like phenotype associated with subtle alteration in memory processes. In light of evaluating pain perception in this animal model, we performed two different behavioral tests commonly used, such as the paw pressure test and the cold plate test, to analyze mechanical hyperalgesia and thermal allodynia, respectively. Behavioural outcomes confirmed the memory impairment in the social recognition test and, compared to sham, Aβ-injected rats showed an increased selective susceptibility to mechanical but not to thermal stimulus. Behavioural data were then corroborated by neurochemical and biochemical biomarker analyses either at central or peripheral level. Data showed that the peptide injection evoked a significant increase in hypothalamic glutamate, kynurenine and dopamine content, while serotonin levels were reduced. Plasma Cystatin-C, a cysteine protease, was increased while serotonin and melatonin levels were decreased in Aβ-injected rats. Urinary levels paralleled plasma quantifications, indicating that Aβ-induced deficits in pain perception, mood and cognitive domain may also depend on these biomarkers. In conclusion, in the present study, we demonstrated that this animal model can mimic several comorbid conditions typical of the early phase of AD. Therefore, in the perspective of generating novel therapeutic strategies relevant to precision medicine in AD, this animal model and the biomarkers evaluated herein may represent an advantageous approach.

Clinico-pathophysiological considerations in coronary microvascular disorders

Around half of the patients undergoing an elective coronary angiogram to investigate typical stable angina symptoms are found to have non-obstructive coronary arteries (defined as < 50% stenosis). These patients are younger with a female predilection. While underlying mechanisms responsible for these presentations are heterogeneous, structural and functional abnormalities of the coronary microvasculature are highly prevalent. Thus, coronary microvascular dysfunction (CMD) is increasingly recognised as an important consideration in patients with non-obstructive coronary arteries. This review will focus on primary coronary microvascular disorders and summarise the four common clinical presentation pictures which can be considered as endotypes - Microvascular Ischaemia (formerly “Syndrome X”), Microvascular Angina, Microvascular Spasm, and Coronary Slow Flow. Furthermore, the pathophysiological mechanisms associated with CMD are also heterogenous. CMD may arise from an increased microvascular resistance, impaired microvascular dilation, and/or inducible microvascular spasm, ultimately causing myocardial ischaemia and angina. Alternatively, chest pain may arise from hypersensitivity of myocardial pain receptors rather than myocardial ischaemia. These two major abnormalities should be considered when assessing an individual clinical picture, and ultimately, the question arises whether to target the heart or the pain perception to treat the anginal symptoms.

Mejora de la calidad de vida en cuidadores informales de personas dependientes mediante talleres educacionales

Introduction: The ageing of the population is associated with an increase in the number of dependent people, with an estimate of 15% living with a disability. The provision of care to family members entails an added responsibility associated with care-related problems, which can have a negative impact on caregivers. Therefore, we propose to design and evaluate a caregiving programme based on caregiver education, measuring knowledge, pain perception, emotional burden and health-related quality of life. Objective: The main objective is to improve the quality of life of informal caregivers through training interventions, in order to decrease the disability caused by caregiving tasks.Method: 99 caregivers belonging to the Aljarafe-Northern Seville Primary Care Health District participated, divided into control and intervention groups. We designed two educational workshops on care programmes for informal caregivers. They completed a knowledge questionnaire, and different validated scales related to pain, health states and quality of life.Results: Most of the caregivers presented back problems, for which they received pharmaceutical treatment. The implemented intervention was associated with a decrease in pain during basic activities of daily living, care and rest, as well as a reduction in strain index in both groups.Conclusions: Intervention programmes for informal carers of dependent patients are effective in improving the state of health and quality of life of this group, and their implementation should therefore be encouraged in primary care. Introducción: El envejecimiento de la población está asociado a un incremento de personas dependientes, estimándose que el 15% vive con alguna discapacidad. La prestación de cuidados a familiares supone una responsabilidad añadida asociada a problemas relacionados con el cuidado, que pueden repercutir negativamente en los cuidadores. Por ello, planteamos diseñar y evaluar un programa de cuidados, basado en la educación de los cuidadores, midiendo los conocimientos, la percepción del dolor, la carga emocional y la calidad de vida relacionada con la salud. Objetivo: El objetivo principal es mejorar la calidad de vida de los cuidadores informales mediante intervenciones formativas, con el fin de disminuir la incapacidad causada por las tareas del cuidado.Método: Participaron 99 cuidadores pertenecientes al Distrito Sanitario Aljarafe-Sevilla Norte de Atención Primaria, divididos en grupo control e intervención. Diseñamos dos talleres educacionales sobre programas de atención a cuidadores informales. Cumplimentaron un cuestionario de conocimientos, y diferentes escalas validadas relacionadas con el dolor, los estados de salud y la calidad de vida.Resultados: La mayor parte de los cuidadores presentaban problemas de espalda tomando medicación para ello. La intervención implementada se asoció a un descenso del dolor durante actividades básicas de la vida diaria, los cuidados y el descanso, y disminución del índice de esfuerzo en ambos grupos.Conclusiones: Los programas de intervención en cuidadores informales de pacientes dependientes resultan eficaces para mejorar el estado de salud y la calidad de vida de este colectivo por lo que se debe fomentar su realización desde la Atención Primaria.