Roots and fates of congenital insensitivity to pain and anhidrosis: a human phenotype

Congenital insensitivity to pain is a rare neurological disorder characterized by the inability to perceive physical pain. Individuals with CIP lack the typical nociceptive responses to harmful stimuli, which poses significant challenges to their safety and well-being. This condition is often caused by genetic mutations affecting the nervous system's ability to transmit pain signals. Despite the apparent advantage of not experiencing pain, CIP presents severe risks as affected individuals may unknowingly sustain injuries or develop medical complications without timely intervention. The absence of pain perception hinders the learning of protective behaviour and responses to potentially harmful situations, making daily activities fraught with danger. Understanding the genetic basis of CIP has provided valuable insights into pain perception and the functioning of nociceptive pathways. While this knowledge may pave the way for potential therapeutic interventions, managing CIP remains a complex task. This article provides an overview of CIPA, its genetic basis, clinical manifestations, complications, treatment and the challenges associated with managing this complex condition. A multidisciplinary approach involving genetic counselling, pain management, and specialized care is crucial to support individuals with CIPA and improve their overall well-being.

Effect of photobiomodulation therapy on pain perception during anesthetic puncture of dental local anesthesia: A systematic review

Abstract Background Local anesthetic puncture is often related to the experience of pain. This study aimed to systematically analyze the literature on changes in pain perception during the anesthetic puncture of dental local anesthesia after Photobiomodulation Therapy (PBMT). Material and methods An electronic search was performed in eight primary databases (Embase, LILACS, BBO, LIVIVO, MedLine via PubMed, SciELO, Scopus, and Web of Science) and three additional ones (EASY, Google Scholar, and OATD) to partially capture the "gray literature". The PICO strategy was used to identify randomized clinical trials evaluating the analgesic effect of PBMT in the anesthetic puncture site of dental local anesthesia compared to placebo or control groups, without restrictions on publication language and year. Two reviewers extracted the data and assessed the individual risk of bias of the eligible studies using the Cochrane Collaboration Risk of Bias Tool version 2.0. Results The electronic search found 3,485 records, of which eight met the eligibility criteria and were included in the qualitative synthesis. The studies were published from 2011 to 2022. None of the included studies had a low risk of bias. PBMT groups showed no significant difference in pain scores compared to placebo and control groups of most studies. Conclusion Based on a low to very low certainty of evidence, PBMT seems to have no effect on pain perception during anesthetic puncture in patients undergoing dental local anesthesia.

Dental pain report in children and genetic polymorphism (rs4818) in Catechol-O-Methyltransferase (COMT) gene: a cross- sectional study

Abstract Aim: Polymorphisms in the COMT gene can alter enzymatic functions, raising levels of endogenous catecholamines, which stimulates beta-adrenergic receptors related to pain. This study aimed to evaluate whether a polymorphism in the COMT gene (rs4818) is associated with dental pain in children. Methodology: A cross-sectional study was conducted with a representative sample of 731 pairs of children and parents randomly selected from a population-based sample of eight-year-old children. Reports of dental pain was evaluated using a question directed at the parents and self-reported pain using the Faces Pain Scale - Revised. Dental caries experience was determined using the Decayed, Missing, and Filled Teeth (DMFT) index. For genetic analysis, DNA was obtained from oral mucosa epithelial cells of 352 children randomly selected from the initial sample. Results: Children with the CC genotype had higher odds of reporting moderate to intense pain than those with the GG genotype (OR=3.60; 95% CI=0.80-16.20; p=0.03). These same children had greater odds of parental reports of pain (OR=1.93; 95% CI=0.91-4.08; p=0.02). Moreover, lower schooling of parents/guardians and caries experience in the primary dentition were significantly associated with greater odds of a parental report of dental pain (OR=2.06; 95% CI=1.47-2.91; p<0.001; OR=6.26; 95% CI=4.46-8.78; p<0.001). Conclusions: The rs4818 polymorphism of the COMT gene is associated with dental pain. Children with the C allele are more likely to report higher levels of pain. Clinical Relevance: Even though the experience of pain is subjective and multifactorial, this study raises the hypothesis that there is a genetic predisposition to dental pain that should be considered in clinical practice.

O método computadorizado de anestesia odontológica é mais efetivo que o método convencional em crianças e adolescentes? Uma revisão sistemática da literatura / Is the computerized dental anesthesia method more effective than the conventional method in children and adolescents? A systematic literature review

Objetivo:Revisar sistematicamente a literatura sobre a efetividade do método computadorizado de anestesia odontológica em relação àdor, comportamento não colaborador e o medo/ansiedade em crianças e adolescentes em comparação com o método convencional. Materiais e métodos:Uma buscaeletrônica foi realizada em cinco base de dados (Biblioteca Virtual em Saúde, Scopus, Embase, Pubmed e Web of Science)e que incluiu ensaios clínicos randomizados. A busca foi realizada em outubro de 2020 eatualizada em maio de 2021 e, não houve restrição de data ou idioma. A avaliação de risco de viés foi realizada usando aRoB 2 e, tambémfoi realizada uma análise qualitativa. Resultados:Foram encontrados 3.518 estudos, e após a remoção das duplicatas, análise do título e resumo e,leitura completa, restaram 26 estudos incluídos. Destes,cinco avaliaram ansiedade/medo, doze avaliaram o comportamento durante a anestesia, e vinte e dois avaliaram a percepção de dor. Não foi observadodiferença significativa na maioria dos estudos entreo uso do método computadorizado em comparação ao método tradicionalpara todos os desfechos analisados. Discussão:Apesar de não parecer haver diferença significativa na percepção de dor, no relato de medo/ansiedade e no comportamento entre o uso do método computadorizado emcomparação ao método tradicional, é fundamentalavaliar o comportamento da criança durante o atendimento odontológico pois suas expressões podem indicar algum desconforto e dor. Esses achados devem ser interpretados com cautela, considerando que quase três quartos dos estudos incluídos apresentaram alto risco de viés. Conclusão:Mesmo com a ausência de diferença, os dispositivos eletrônicos são promissores, visto que promovem uma administração lenta e controlada e resultam em uma anestesia segura e eficaz que coloca-se como alternativa a prática clínica.

Aim:To systematically review the literature on the effectiveness of the computerized method of dental anesthesia in relation to pain, non-collaborative behavior and fear/anxiety in children and adolescents compared to the conventional method. Materials and methods:An electronic search was performed in five databases (Virtual Health Library, Scopus, Embase, Pubmed and Web of Science)that included randomized clinicaltrials. The search was performed in October 2020 and updated in May 2021. The risk of bias assessment was performed using the RoB 2 andaqualitative analysis was also performed. Results:A total of 3,518 studieswere found, and after removing duplicates, analyzing the title and abstract, and completereading, 26 studies remainedincluded. Of these, five assessed anxiety/fear, twelve assessed behavior during anesthesia, and twenty-two assessed pain perception. No significant difference was observed in most studies between the use of the computerized method compared to the traditional method for all outcomesanalyzed. Discussion:Although there does not seem tobe a significant difference in pain perception, fear/anxiety reports and behavior between the use of the computerized method and the traditional method, it is fundamental to evaluate the child's behavior during dental care, as their expressions may indicate some discomfort and pain. These findings should be interpreted with caution, considering that nearly three-quarters of the included studies were at high risk of bias. Conclusion:Even with the absence of difference, electronic devices are promising, as they promote slow and controlled administration and result in safe and effective anesthesia, which is an alternative to clinical practice.

Beliefs and concerns about pain were associated with craniofacial pain experienced within 24 hours: cross-sectional study / Crenças e preocupações sobre a dor têm associação à dor craniofacial experimentada nas últimas 24 horas: estudo transversal

ABSTRACT BACKGROUND AND OBJECTIVES: Although craniofacial pain has been associated with negative psychological aspects, how the patient's perception of their own illness could influence craniofacial pain is not elucidated yet. Therefore, this study aims to identify the main factors and beliefs about the illness that could influence pain intensity and pain duration in people who experienced craniofacial pain in the last 24 hours. METHODS: This cross-sectional study comprised undergraduate students, aged between 18 and 40 years old, who experienced self-reported craniofacial pain in the last 24 hours. Participants answered questions regarding body functions, activities and participation, and personal factors based on the International Classification of Functioning (ICF); In addition, questions from the Brief Illness Perceptual Questionnaire (Brief IPQ) were applied. The analysis was carried out with a single and multiple regression model. RESULTS: The sample comprised 87 volunteers. Pain intensity and duration experienced in the last 24 hours were associate by concerns about the presence of an illness and the need for treatment. Pain intensity was specifically associated with the importance of treatment and the extent to which the patient is concerned about their pain (R2=0.108). Pain duration was associated with how much the individual is worried about their illness (R2=0.1459). CONCLUSION: Both pain intensity and duration experienced in the last 24 hours are associated with concerns regarding the presence of an illness and beliefs related to such illness treatment, which reinforces the influence of psychosocial aspects on pain perception.

RESUMO JUSTIFICATIVA E OBJETIVOS: Embora a dor craniofacial seja associada a aspectos psicológicos negativos, ainda não está totalmente elucidado como a percepção do paciente sobre sua própria doença pode influenciá-la. Portanto, este estudo teve como objetivo identificar os principais fatores e as crenças sobre a doença que podem influenciar a intensidade e a duração da dor em pessoas que sentiram dor craniofacial nas últimas 24 horas. MÉTODOS: Estudo transversal composto por universitários, com idade entre 18 e 40 anos, que relataram dor craniofacial nas últimas 24 horas. Os voluntários responderam a perguntas sobre funções corporais, atividades e participação e fatores pessoais com base na classificação da Classificação Internacional de Funcionalidades (CIF). Além disso, foram aplicadas questões do Questionário de Percepção de Doenças Versão Breve (Brief IPQ). A análise foi realizada com um modelo de regressão simples e múltiplo. RESULTADOS: A amostra foi composta por 87 voluntários. A intensidade e a duração da dor sentida nas últimas 24 horas foram influenciadas pela preocupação com a presença de doença e com a necessidade de tratamento. A intensidade da dor foi associada à importância do tratamento e à preocupação do paciente com sua dor (R2=0,108). A duração da dor associou-se à preocupação do indivíduo com sua doença (R2=0,1459). CONCLUSÃO: Tanto a intensidade quanto a duração da dor vivenciadas nas últimas 24 horas são influenciadas pela preocupação com a presença de doença e crenças relacionadas ao seu tratamento, o que reforça a influência dos aspectos psicossociais na percepção da dor.

A comparative evaluation of placebo effect on pain perception parameters in open-label versus double-blind groups: a prospective randomized pilot study in healthy volunteers

Background: Considerable placebo response rate is commonly observed in placebo-controlled trials involving analgesics. However, there is paucity of evidence with regard to comparison of effect of open-label placebo versus double-blind placebo on pain perception. Methods: In this study, cold water maintained at 4±1°C was used to induce experimental pain. Enrolled subjects were randomized to receive either 2% lignocaine gel as active drug or K-Y jelly as placebo as per the groups in open-label (two groups) and double-blind (two groups) study. Pain perception was evaluated using pain threshold time and pain tolerance time after immersion of subject’s hand in the cold water. Pain intensity was assessed using visual analogue scale (VAS). Results: Sixty-nine subjects were randomized into 4 study groups namely open-label lignocaine (OLL; N=17), open-label placebo (OLP; N=18), double-blind lignocaine (DBL; N=17) and double-blind placebo (DBP; N=17). OLP application increased pain intensity on VAS from 67 (47, 84) to 72 (39, 88) mm (p=0.018). OLL application reduced pain perception pain threshold time from 20.4 (4.0, 45.1) to 24.1 (6.3, 124.2) seconds (p=0.049) and pain tolerance time from 32.7 (6.8, 110.2) to 40.0 (7.7, 156.7) seconds (p=0.019). The change in pain parameters (before and after application of study intervention) was comparable without any significant difference among the four study groups (p=0.257 for pain threshold time, p=0.165 for pain tolerance time and p=0.563 for pain intensity score). Conclusions: Lignocaine and placebo gel application showed comparable change in pain perception irrespective of blinding.

Relationship between spinal cord Caprin-1-mediated expression of CaMKⅡα and pain perception in mice / 中华麻醉学杂志

Objective:To evaluate the relationship between spinal cord cytoplasmic activation/proliferation-associated protein-1 (Caprin-1)-mediated expression of calmodulin-dependent protein kinase Ⅱ alpha(CaMKⅡα) and pain perception in mice.Methods:Nestin CreERT2 mice and Caprin-1 flox/flox mice were hybridized to obtain Nestin CreERT2; Caprin-1 flox/flox homozygous mice. The mice were divided into 2 groups ( n=5 each) using a random number table method: Nestin CreERT2; Caprin-1 flox/floxsolventcontrol group (SC group) and Caprin-1 gene knockout group (KO group). Tamoxifen 100 mg/kg was intraperitoneally injected for 5 consecutive days to generate inducible knockout of the Caprin-1 gene in KO group. The mechanical paw withdrawal threshold was measured at day 1 before and day 5 after the end of administration. Then the mice were sacrificed, and L 4-6 segments of the spinal cord were removed for determination of the expression of Caprin-1 and CaMKⅡα protein and mRNA (by Western blot or real-time quantitative polymerase chain reaction) and co-expression of Caprin-1 with CaMKⅡα (by immunofluorescent double staining). Results:Compared with SC group, the mechanical paw withdrawal threshold was significantly increased at 5 days after the end of tamoxifen administration, the expression of Caprin-1 and CaMKⅡα protein and mRNA was down-regulated ( P<0.05), and the co-localization expression of Caprin-1 and CaMKⅡα in the spinal dorsal horn was down-regulated in KO group. Conclusions:Caprin-1 is involved in the development of pain perception by promoting CaMKⅡα expression.

A new mouse model to study the empathic fear and pain behavior / 中国药理学与毒理学杂志

OBJECTIVE Human beings possess the ability to indirectly acquire the emotions of others.This also known as emotional contagion or empathy,enables us to rapidly perceive the emotions of others.However,an excessive empathy may result in heightened fear and sensitivity to pain.Therefore,the establishment of appropri-ate animal models for analyzing neural mechanisms underlying empathy would contribute to pharmacological research on pain sensitivity caused by psychological sus-ceptibility.METHODS We used the observed fear para-digm for assessing contagion of negative emotions in mice.To minimize the impact of emotional contagion dif-ferences caused by the subject change,we established a bilateral observation area and the two mice were trained to observe fear simultaneously.First,two observer(OB)mice were placed on either side of the observational area.Next,a demonstrator(DM)mouse was introduced into the cylindrical shock cage located at the center of the apparatus.The shock cage is made of transparent organic plastic with air holes and has provided ample space for free movement by the DM mouse.During the shock stage,DM mice were subjected to electric stimulation while the behaviors of OB mice on both sides was observed,including freezing,the side and corner time,social interaction behavior.Additionally,c-Fos staining was utilized to confirm distinct local brain activities.RESULTS In the habituation stage,OB mice on both sides showed more social preference for DM mouse,as evidenced by an increase in duration time in the designat-ed interaction zone.During the shock phase,OB mice observed the DM mouse receiving electric shocks and displayed significantly higher levels of fear contagion;however,their fear behavior was not entirely consistent.Some mice exhibited a significant increase in freezing time,while others demonstrated a significant increase in corner and side exploration time.We utilized Z-normal-ization to evaluate changes in emotionality across vari-ous behaviors and identified mice with distinct susceptibil-ities.Fos-positive neurons exhibited higher expression levels in susceptible OB mice,primarily concentrated within brain regions associated with the ascending path-ways of pain perception,such as thalamus,the anterior insular cortex,and anterior cingulate cortex.CONCLU-SION In this study,we have developed an innovative experimental facility that integrates various behavioral tests to evaluate empathic behavior in mice.Our findings highlight the robustness of emotionality measures obtained from individual mice by combining this experi-mental model with the Z-scoring method,facilitating screening for empathic fear or pain-susceptible mice and will helpful for pharmacological evaluation.

Validation of an instrument for dentists' perception of pain in patients with communication difficulties

Pain is present in the dental clinic, whether due to oral problems such as dental caries and its complications or related to dental procedures. Pain evaluation in patients with communication difficulties (PCDs) is challenging for dentists, potentially compromising treatment. The aim of this study was to develop and validate an instrument to assess the perception of dentists about pain in PCDs. This study followed a quantitative methodological approach involving constructing and validating an instrument administered to 50 dentists. The initial instrument consisted of 29 items divided into four domains. Content and construct validity and internal consistency were confirmed. Content validation was performed by judges using the Content Validity Index. The instrument underwent construct validation and internal consistency assessments through exploratory factor analysis and confirmatory factor analysis using Cronbach's α, Kaiser-Meyer-Olkin, and Bartlett's sphericity tests. The final instrument consisted of 21 items divided into three domains, with a high Cronbach's α for one domain and moderate values for the others. The total variance accounted for was above 46.03%. Each factor retained at least three items, with factor loadings greater than 0.3, commonalities greater than 0.2, and eigenvalues >1. Despite the study's limitations, the instrument demonstrated its applicability and potential in evaluating the perception and management of pain in PCDs.

Espiritualidade e dor em pacientes com câncer de mama metastático / Spirituality and pain in patients with metastatic breast cancer / Espiritualidad y dolor en pacientes con cáncer de mama metastásico

Resumo Mediante estudo observacional, transversal e quantitativo que utilizou os instrumentos de avaliação Brief Pain Inventory (dor), Functional Assessment of Chronic Illness Therapy Spiritual Well-Being (bem-estar espiritual) e Beck Depression Inventory - Short Form (depressão), busca-se avaliar a influência da espiritualidade e da depressão na percepção de dor de pacientes acometidas por neoplasia de mama metastática. A idade média foi 57,3 anos e, das 30 participantes, 24 (80%) tratavam-se em serviço público; 17 (57%) tinham diagnóstico de câncer de mama há mais de cinco anos; e 27 (90%) realizavam alguma prática religiosa/espiritual. Pacientes com escore de bem-estar espiritual acima da mediana apresentaram menor escore dos sintomas depressivos (3 vs . 6; p =0,021). Não houve diferença significativa em relação à mediana do escore total do bem-estar espiritual quando estratificado pela mediana da percepção de dor (31,5% vs . 28,5%; p =0,405). Maior manifestação de bem-estar espiritual pode estar relacionada a menores índices de depressão.

Abstract This observational, cross-sectional and quantitative study, by means of the assessment instruments Brief Pain Inventory, Functional Assessment of Chronic Illness Therapy Spiritual Well-Being and Beck Depression Inventory - Short Form, evaluated the influence of spirituality and depression in the pain perception of patients with metastatic breast cancer. Mean age was 57.3 years. Of the 30 participants, 24 (80%) were treated in a public service, 17 (57%) had been diagnosed with breast cancer for more than 5 years, and 27 (90%) were religious or spiritual. Patients with spiritual well-being scores above the median had lower depressive symptom scores (3 vs. 6; p =0.021). The median total score of spiritual well-being showed no significant difference when stratified by median pain perception (31.5% vs. 28.5%; p =0.405). Greater spiritual well-being may be related to lower rates of depression.

Resumen Este estudio observacional, transversal y cuantitativo utilizó los instrumentos Brief Pain Inventory (dolor), Functional Assessment of Chronic Illness Therapy Spiritual Well-Being (bienestar espiritual) y Beck Depression Inventory - Short Form (depresión), para evaluar si la espiritualidad y la depresión influencian en la percepción del dolor en pacientes con cáncer de mama metastásico. La edad promedio fue de 57,3 años; de las 30 participantes, 24 (80%) recibían atención pública; 17 (57%) tenían diagnóstico de cáncer de mama hace más de cinco años; y 27 (90%) solían tener alguna práctica religiosa/espiritual. Aquellas con puntuación de bienestar espiritual superior a la mediana tuvieron una puntuación más baja de síntomas depresivos (3 vs. 6; p =0,021). No hubo diferencias significativas en la mediana de la puntuación total de bienestar espiritual cuando se estratificó por la percepción mediana del dolor (31,5% vs. 28,5%; p =0,405). Una mayor sensación de bienestar espiritual se relacionó a bajas tasas de depresión.

Perinatal N(G)-Nitro-L-arginine methyl ester administration decreases anxiety- and depression-like behaviors in adult mice

ABSTRACT Objective: We hypothesized that perinatal manipulations of the nitrergic system would affect adult animal behaviors. Methods: We tested this hypothesis by perinatally administering N(G)-Nitro-L-arginine methyl ester (L-NAME), a non-specific antagonist of nitric oxide synthase for 15 days and assessed anxiety- and depression-like behaviors in adult mice. At 70 days of age, the mice were subjected to a battery of tests consisting of the open-field, light/dark box, forced swim, and tail-flick tests. The tests were performed at two-day intervals, and the order of the tests within the battery was determined according to the progressive invasiveness degree. Results: L-NAME-treated animals exhibited decreased anxiety-like behavior in the light/dark box and open field tests, with no change in locomotor activity. Additionally, they demonstrated decreased depression-like behavior in the forced swim test and no change in pain perception in the tail-flick test. Conclusion: The nitrergic system is possibly involved in neural circuitry development that regulates behaviors since blocking perinatal nitric oxide production decreases anxiety- and depression-like behaviors in adult mice.

Comparison of gingival inflammatory parameters and pain perception on periodontal probing - a cross sectional study, part II / Comparación de parámetros inflamatorios gingivales y percepción del dolor en el sondaje periodontal - un estudio transversal, parte II

Background: Probing of the periodontal pocket is an essential part of the diagnosis of periodontal disease and 15-77% of untreated periodontal patients experience pain during probing. Therefore, the objective of this study is to evaluate the pain perceived by patients with dental plaque-induced gingivitis and chronic periodontitis during periodontal probing and the main objective includes the evaluation of the relationship between pain perceived during periodontal probing and gingival inflammatory parameters. Material and Methods: A total of 475 participants were recruited into the study. The patients were divided into two groups: Group-A (Gingivitis Group - 275 patients) and Group-B (Chronic Periodontitis Group - 200 patients). Clinical parameters included analysis of bleeding on probing, simplified gingival index, pocket depth on probing, and clinical attachment level. Pain score was recorded using the HP VAS scale and all patients participated in the study after a detailed explanation of the study protocol. Results: A significant difference in pain perception was noted between groups, highlighting the role of the degree of inflammation in the examination of periodontal parameters. Conclusion: Within the limitations of the present study, we can conclude that pain perception is directly correlated with the degree of inflammation in periodontitis rather than plaque-induced gingivitis during periodontal probing. Therefore, some form of adjuvant topical anesthesia may be considered in order to reduce pain levels in severely inflamed patients, to encourage continued acceptance of supportive periodontal therapy.

Antecedentes: El sondaje de la bolsa periodontal es una parte esencial en el diagnóstico de la enfermedad periodontal. 15-77% de los pacientes periodontales no tratados experimentan dolor durante el sondaje. Por lo tanto, el objetivo de este estudio es evaluar el dolor percibido por pacientes con gingivitis inducida por placa dental y periodontitis crónica durante el sondaje periodontal y el objetivo principal incluye la evaluación de la relación entre el dolor percibido durante el sondaje periodontal con parámetros inflamatorios gingivales. Material y Métodos: Un total de 475 sujetos fueron reclutados en el estudio. Los sujetos se dividieron en 2 grupos: Grupo - A (Grupo de gingivitis - 275 pacientes) y Grupo - B (Grupo de periodontitis crónica - 200 pacientes). Los parámetros clínicos incluyeron el análisis del sangrado al sondaje, el índice gingival simplificado, la profundidad de la bolsa al sondaje y el nivel de inserción clínica. La puntuación del dolor se registró utilizando la escala HP VAS y todos los pacientes participaron en el estudio después de una explicación detallada del protocolo del estudio. Resultados: Se notó una diferencia significativa en la percepción del dolor en el grupo B que en el grupo A, lo que significa el papel del grado de inflamación en el examen de los parámetros periodontales. Conclusión: Dentro de las limitaciones del presente estudio, podemos concluir que la percepción del dolor se correlaciona directamente con el grado de inflamación que se observa en la periodontitis más que con la gingivitis inducida por la placa dental durante el sondaje periodontal. Por lo tanto, se puede considerar alguna forma de anestesia tópica adyuvante para reducir los niveles de dolor en pacientes gravemente inflamados para fomentar la aceptación continua de la terapia periodontal de apoyo.

Evaluation of pain perception on periodontal probing in patients with dental plaque induced gingivitis and chronic periodontitis - a cross sectional study, part I / Evaluación de la percepción del dolor al sondaje periodontal en pacientes con gingivitis inducida por placa dental y periodontitis crónica: un estudio transversal, parte I

Background: Probing of periodontal pockets is an essential part in the diagnosis of periodontal disease. Fifteen to seventy seven percent of untreated periodontal patients experience pain during probing. Hence the aim of this study is to evaluate the pain perceived by patients with gingivitis and periodontitis during periodontal probing. The goals of this study were to compare the patients' pain perception when using a conventional UNC15 probe and a manual pressure sensitive periodontal probe, and to relate the clinical features of gingivitis and periodontitis to the discomfort associated with periodontal probing. Material and Methods: A total of 475 subjects were recruited into the study. The subjects were initially divided into two groups ­ Group ­ A (Gingivitis group - 275 patients) and Group ­ B (Chronic Periodontitis group -200 patients) according to the AAP 1999 Classification. These two groups were further subdivided into two groups each (Gingivitis ­ Conventional Probe ­ GCP, Gingivitis ­ Manual Pressure Sensitive Probe ­ GMPS, Periodontitis - Conventional Probe ­ PCP, Periodontitis ­ Manual Pressure Sensitive Probe ­ PMPS) using a computer generated program of random numbers. Results: A significant difference was noted in pain perception when pressure sensitive probe was used compared to conventional UNC-15 probe. Reduced Bleeding on Probing and Pain scores were noted in Chronic periodontitis subjects with use of pressure sensitive probe, which was statistically significant (p<0.001). Conclusion: Dentistry has changed its focus towards painless dentistry. In this context, the present study presents data towards use of manual pressure sensitive probes, which offers an advantage of low cost when compared to more advanced computerized systems with reduced pain during periodontal examination. It could result in a positive attitude of the patients towards continuous supportive periodontal therapy thereby monitoring periodontal health.

Antecedentes: El sondaje de los sacos periodontales es una parte esencial en el diagnóstico de la enfermedad periodontal. Del quince al setenta y siete por ciento de los pacientes periodontales no tratados experimentan dolor durante el sondaje. De ahí que el objetivo de este estudio fué evaluar el dolor percibido por pacientes con gingivitis y periodontitis durante el sondaje periodontal. Los objetivos de este estudio fueron comparar la percepción del dolor de los pacientes al usar una sonda UNC15 convencional y una sonda periodontal sensible a la presión manual, y relacionar las características clínicas de la gingivitis y la periodontitis con la incomodidad asociada con el sondaje periodontal. Material y Métodos: Un total de 475 sujetos fueron reclutados en el estudio. Los sujetos se dividieron inicialmente en dos grupos - Grupo - A (grupo de Gingivitis - 275 pacientes) y Grupo - B (grupo de Periodontitis Crónica - 200 pacientes) de acuerdo con la Clasificación AAP 1999. Estos dos grupos se subdividieron en dos grupos cada uno (Gingivitis - Sonda convencional - GCP, Gingivitis - Sonda manual sensible a la presión - GMPS, Periodontitis - Sonda convencional - PCP, Periodontitis - Sonda manual sensible a la presión - PMPS) usando un programa generado por computadora de datos aleatorios. números. Resultados: Se notó una diferencia significativa en la percepción del dolor cuando se usó una sonda sensible a la presión en comparación con la sonda UNC-15 convencional (p<0,001). Conclusion: La odontología ha cambiado su enfoque hacia una odontología sin dolor. En este contexto, el presente estudio presenta datos hacia el uso de sondas manuales sensibles a la presión, que ofrece una ventaja de bajo costo en comparación con sistemas computarizados más avanzados con reducción del dolor durante el examen periodontal. Podría resultar en una actitud positiva de los pacientes hacia la terapia periodontal de apoyo continuo, monitoreando así la salud periodontal.

Looking at neonatal facial features of pain: do health and non-health professionals differ?

Abstract Objective: To analyze the regions that trigger the attention of adults' gaze when assessing pain in newborn infants' pictures and to verify if there are differences between health and non-health professionals. Method: Experimental study with 84 health professionals and 59 non-health professionals, who evaluated two images of 10 neonates, one at rest and the other during a painful procedure. Each image was shown for 7 seconds on a computer screen, while eye movements were tracked by the Tobii TX300 EyeTracker. After evaluating each image, participants gave a score from 0 (absent pain) to 10 (maximum pain), according to their perception of neonatal pain. For each image, the number and total time of gaze fixations in the forehead, eyes, nasolabial furrow, and mouth were studied. Comparisons between both groups of adults were made by an intraclass correlation coefficient, Student's t-test, and Bland Altman graphic. Results: Health professionals (93% female; 34 ± 9 years old), compared to non-health professionals (64% female; 35 ± 11 years old), gave lower scores for images at rest (0.81 ± 0.50 vs. 1.59 ± 0.76; p = 0.010), with no difference for those obtained during the painful procedure (6.98 ± 1.08 vs. 6.73 ± 0.82). There was a strong or almost perfect correlation for the number of fixations in the mouth, eyes, forehead, and for the total fixation time in the eyes and forehead. Conclusions: Adults, irrespective of their profession, showed a homogeneous gaze pattern when evaluating pictures of neonates at rest or during a painful procedures.

Avaliação da dor em mulheres com câncer cérvico-uterino durante a braquiterapia / Pain evaluation in women with cervical-uterine neoplasms during brachytherapy / Evaluación del dolor en mujeres con cáncer cérvico-uterino durante la braquiterapia

RESUMO Objetivo: avaliar a intensidade da dor em mulheres submetidas à braquiterapia pélvica. Método: estudo transversal, analítico, quantitativo realizado em instituição oncológica (Santa Catarina/Brasil), incluindo 97 mulheres em braquiterapia pélvica, com (grupo 1) ou sem (grupo 2) sedação anestésica. Coleta de dados entre setembro de 2018 a julho de 2019, por entrevista estruturada e no prontuário da paciente. Intensidade da dor avaliada em cinco momentos por escala visual analógica. Análise incluiu medidas de frequência, teste qui-quadrado, análise de resíduos padronizados ajustados, equações de estimações generalizadas, teste post-hoc de Bonferroni; nível de significância 0,05. Resultados: 51 mulheres (52,6%) referiram dor prévia à braquiterapia, 73 (75,3%) após. Na retirada dos aplicadores, grupo 1 atingiu 55,9% na proporção de presença de dor, grupo 2 36,8%. Houve significância da percepção dolorosa por momento/sedação (p<0,001). Conclusão: percepção dolorosa observada na maioria das mulheres. Os resultados contribuíram para revisão do protocolo institucional para sedação endovenosa e melhor controle álgico.

ABSTRACT Objective: to evaluate pain intensity in women undergoing pelvic brachytherapy. Method: cross-sectional, analytical, quantitative study conducted in an oncology institution (Santa Catarina/Brazil), including 97 women undergoing pelvic brachytherapy, with (group 1) or without (group 2) anesthetic sedation. Data collection between September 2018 to July 2019, by structured interview and in the patient's medical record. Pain intensity assessed at five time points by visual analog scale. Analysis included frequency measures, chi-square test, adjusted standardized residuals analysis, generalized estimating equations, Bonferroni post-hoc test; significance level 0.05. Results: 51 women (52.6%) reported pain before brachytherapy, 73 (75.3%) after. At the removal of the applicators, group 1 reached 55.9% in the proportion of presence of pain, group 2, 36.8%. There was significance of pain perception by moment/sedation (p<0.001). Conclusion: pain perception observed in most women. The results contributed to revision of the institutional protocol for intravenous sedation and better pain control.

RESUMEN Objetivo: evaluar la intensidad del dolor en mujeres sometidas a braquiterapia pélvica. Método: estudio transversal, analítico y cuantitativo realizado en una institución de oncología (Santa Catarina/Brasil), incluyendo 97 mujeres sometidas a braquiterapia pélvica, con (grupo 1) o sin (grupo 2) sedación anestésica. Recogida de datos entre septiembre de 2018 y julio de 2019, mediante entrevista estructurada y en la historia clínica del paciente. La intensidad del dolor se evaluó en cinco momentos mediante una escala analógica visual. El análisis incluyó medidas de frecuencia, prueba de chi-cuadrado, análisis de residuos estandarizados ajustados, ecuaciones de estimación generalizadas, prueba post-hoc de Bonferroni; nivel de significación 0,05. Resultados: 51 mujeres (52,6%) refirieron dolor antes de la braquiterapia, 73 (75,3%) después. Al retirar los aplicadores, el grupo 1 alcanzó el 55,9% en la proporción de presencia de dolor, el grupo 2 el 36,8%. Hubo significación de la percepción del dolor según el momento/sedación (p<0,001). Conclusión: La percepción del dolor se observó en la mayoría de las mujeres. Los resultados contribuyeron a revisar el protocolo institucional de sedación endovenosa y a mejorar el control del dolor.

Pain catastrophizing as a predictor for postoperative opioid requirements for breakthrough pain in patients undergoing elective surgery admitted in a private institution from January 2021 to June 2021

BACKGROUND@#Post-operative pain management is a major challenge encountered by anesthesiologists. Opioids remain to be the most frequently administered analgesic for acute pain despite its many untoward side effects. Little is known about pre-operative pain perception and the psychophysiologic aspects of pain control and response, such as Pain Catastrophizing. The observer aims to identify if pain catastrophizing could be a good predictor for post- operative opioid requirement for breakthrough pain.@*METHODS@#Patients scheduled for elective surgery were stratified pre-operatively as Catastrophizers and Non- Catastrophizers using the Pain Catastrophizing Scale (PCS). Their patient profile, and total opioid consumption in the following stages of surgery: intra- operatively, recovery room admission, and the first post-operative day, were recorded and converted to morphine equivalent doses.@*RESULTS@#The comparative analysis of the morphine equivalent doses between catastrophizers and non- catastrophizers show that it is significantly different between the two groups of patients for opioid consumption for breakthrough pain in the recovery room and on the first post-operative day. The values suggest that there are significantly higher doses in catastrophizers than in the non-catastrophizers.@*CONCLUSION@#Pain Catastrophizers were shown to require a significantly higher amount of opioids for breakthrough pain during recovery room admission and first post-operative day versus Non-Catastrophizers. This finding is consistent with the existing literature suggesting that pain catastrophizing is a predictor of post-operative opioid consumption in patients undergoing various elective surgeries.

The Study on the pathogenesis of migraine / 中风与神经疾病杂志

@#Abstract: Objective To explore the pain threshold, current perception threshold and pain tolerance threshold of migraine patients in the interpartial period of headache, so as to clarify their sensory sensitivity. Methods From September 2019 to June 2021 ,27 migraine patients and healthy subjects with matched age, gender and education level were collected in Department of Neurology, People’s Hospital of Wuhan University. During the interpartial period of migraine, the pain perception threshold (PPT) of the bilateral first trigeminal nerve and median nerve was measured by the Von Frey fiber, and the current perception thresholds (CPT) of the bilateral first trigeminal nerve and median nerve and the pain tolerance threshold(PTT) of the bilateral median nerve were recorded by sensory nerve quantitative detector. Results In our study, no significant statistical differences were found between PPT and CPT and healthy controls, but PTT values were significantly decreased compared with the control group. Conclusion The reduced threshold of pain tolerance during interpartial period may be related to central sensitization, which may be caused by abnormal sensory inputs of Aδ and C fibers.

Daily Toothbrushing Frequency and the Association with Parental Report of Dental Pain and Discomfort in Preschool Children

Abstract Objective: To evaluate the impact of daily toothbrushing frequency on parental reports of dental pain and discomfort in preschoolers. Material and Methods: An observational cross-sectional study was conducted involving 376 children between four and five years of age at public preschools in the city of Campo Magro, Brazil. Parents/guardians answered a socioeconomic questionnaire that contained a single question on the child's daily toothbrushing frequency and the Brazilian version of the Dental Discomfort Questionnaire (DDQ-B). Statistical analysis involved bivariate and multivariate Poisson regression analyses (α=0.05). Results: After the adjustments in the multivariate analysis, the prevalence of dental pain and discomfort was lower among children whose last visit to the dentist was for prevention (PR = 4.42; 95% CI: 1.75- 11.14; p=0.002) and those with a higher daily toothbrushing frequency (PR = 2.13; 95% CI: 1.12-4.05; p=0.021). Conclusion: A lower toothbrushing frequency is associated with parental reports of dental pain and discomfort in preschoolers. Educational and preventive measures that stimulate an increase in daily toothbrushing frequency can contribute to a better oral health status in preschoolers, consequently, less prevalence of dental pain and discomfort.

Avaliação da dor em mulheres com câncer cérvico-uterino durante a braquiterapia / Pain evaluation in women with cervical-uterine neoplasms during brachytherapy / Evaluación del dolor en mujeres con cáncer cérvico-uterino durante la braquiterapia

RESUMO Objetivo: avaliar a intensidade da dor em mulheres submetidas à braquiterapia pélvica. Método: estudo transversal, analítico, quantitativo realizado em instituição oncológica (Santa Catarina/Brasil), incluindo 97 mulheres em braquiterapia pélvica, com (grupo 1) ou sem (grupo 2) sedação anestésica. Coleta de dados entre setembro de 2018 a julho de 2019, por entrevista estruturada e no prontuário da paciente. Intensidade da dor avaliada em cinco momentos por escala visual analógica. Análise incluiu medidas de frequência, teste qui-quadrado, análise de resíduos padronizados ajustados, equações de estimações generalizadas, teste post-hoc de Bonferroni; nível de significância 0,05. Resultados: 51 mulheres (52,6%) referiram dor prévia à braquiterapia, 73 (75,3%) após. Na retirada dos aplicadores, grupo 1 atingiu 55,9% na proporção de presença de dor, grupo 2 36,8%. Houve significância da percepção dolorosa por momento/sedação (p<0,001). Conclusão: percepção dolorosa observada na maioria das mulheres. Os resultados contribuíram para revisão do protocolo institucional para sedação endovenosa e melhor controle álgico.

ABSTRACT Objective: to evaluate pain intensity in women undergoing pelvic brachytherapy. Method: cross-sectional, analytical, quantitative study conducted in an oncology institution (Santa Catarina/Brazil), including 97 women undergoing pelvic brachytherapy, with (group 1) or without (group 2) anesthetic sedation. Data collection between September 2018 to July 2019, by structured interview and in the patient's medical record. Pain intensity assessed at five time points by visual analog scale. Analysis included frequency measures, chi-square test, adjusted standardized residuals analysis, generalized estimating equations, Bonferroni post-hoc test; significance level 0.05. Results: 51 women (52.6%) reported pain before brachytherapy, 73 (75.3%) after. At the removal of the applicators, group 1 reached 55.9% in the proportion of presence of pain, group 2, 36.8%. There was significance of pain perception by moment/sedation (p<0.001). Conclusion: pain perception observed in most women. The results contributed to revision of the institutional protocol for intravenous sedation and better pain control.

RESUMEN Objetivo: evaluar la intensidad del dolor en mujeres sometidas a braquiterapia pélvica. Método: estudio transversal, analítico y cuantitativo realizado en una institución de oncología (Santa Catarina/Brasil), incluyendo 97 mujeres sometidas a braquiterapia pélvica, con (grupo 1) o sin (grupo 2) sedación anestésica. Recogida de datos entre septiembre de 2018 y julio de 2019, mediante entrevista estructurada y en la historia clínica del paciente. La intensidad del dolor se evaluó en cinco momentos mediante una escala analógica visual. El análisis incluyó medidas de frecuencia, prueba de chi-cuadrado, análisis de residuos estandarizados ajustados, ecuaciones de estimación generalizadas, prueba post-hoc de Bonferroni; nivel de significación 0,05. Resultados: 51 mujeres (52,6%) refirieron dolor antes de la braquiterapia, 73 (75,3%) después. Al retirar los aplicadores, el grupo 1 alcanzó el 55,9% en la proporción de presencia de dolor, el grupo 2 el 36,8%. Hubo significación de la percepción del dolor según el momento/sedación (p<0,001). Conclusión: La percepción del dolor se observó en la mayoría de las mujeres. Los resultados contribuyeron a revisar el protocolo institucional de sedación endovenosa y a mejorar el control del dolor.

Efficacy of audiovisual distraction using eyeglasses during dental care: a randomized clinical trial

Abstract This randomized parallel-group control trial tested the efficacy of distraction using audiovisual eyeglasses (AVE) during dental procedures [NCT03902158]. Forty-four 6-9 year-old children with low/moderate anxiety and who needed restorative treatment or exodontia of the primary molars were randomly allocated into two groups: the AVE (experimental) and the conventional behavior management techniques (control) groups. Motion sensors were used to measure the participants' body movements. Dental visits were video recorded, and their pain levels and behavior were assessed using the Faces, Legs, Activity, Cry, and Consolability Behavioral Pain Assessment Scale and the Venham Behavioral Scale, respectively. Anxiety was assessed via heart rate measurements. After treatment, the children scored their pain using the Faces Pain Scale. Mann-Whitney U and chi-square tests were used to compare the groups. The mean score on the behavioral scale was 0.59 in the experimental group and 0.72 in the control group under local anesthesia (p = 0.73). During the procedure, the mean score was 0.41 in the experimental group and 1.32 in the control group (p = 0.07). The mean heart rate was similar in both groups (p = 0.47), but a significant increase during treatment was observed in the control group. There was no difference between the groups in terms of pain, behavior, and self-reported pain scores (p = 0.08). Children aged 6-7 who used the AVE had fewer wrist movements (435.6) than that of children in the control group (1170.4) (p = 0.04). The AVE achieved similar results to the basic behavior management techniques, with good acceptance by the children.