Da imaginação à neuroimagem: uma análise antropológica sobre a racionalidade do efeito placebo em ensaios clínicos / From imagination to neuroimage: An anthropological analysis on the rationality of the placebo effect in clinical trials

Resumo O efeito placebo é um ponto de passagem obrigatório para a compreensão da racionalidade envolvida nos ensaios clínicos randomizados. A partir da antropologia da ciência e da tecnologia, este artigo analisa como a noção de efeito placebo tem sido utilizada pela ciência na produção de fronteiras biossociais. Assim, enfoca fenômenos que inicialmente eram atribuídos à imaginação e analisa as consequências de novas metodologias científicas que têm reconhecido outras potencialidades desse efeito, mas tendem a privilegiar marcadores biológicos. O argumento central é que a disputa epistemológica oculta a existência múltipla do efeito placebo que pode ser reconhecida em função das diferentes práticas às quais ele confere racionalidade.

Abstract The placebo effect is an obligatory passage point to understand rationality in randomized clinical trials. From the perspective of science and technology studies, this paper analyzes how the notion of the placebo effect has been used by science in the production of biosocial borders. Thus, it will pay attention to the phenomena considered caused by imagination, and we will analyze the consequences of new methodologies that have recognized other potentialities of this effect but tend to favor biological markers. The central argument is that the epistemological dispute hides the multiple existences of the placebo effect to be recognized due to the different scientific practices to which it confers rationality.

Espiritualidade aplicada à medicina / Spirituality applied to medicine / Espiritualidad aplicada a la medicina

Resumo Espiritualidade é a força que une os diferentes aspectos componentes do ser e, quando trabalhada, proporciona uma vivência harmônica e promove equilíbrio entre bem-estar físico, social e mental. Nesse sentido, objetivou-se abordar, secularmente, como a espiritualidade é vista na medicina, sua influência na saúde e a percepção de profissionais e pacientes acerca desse assunto. Para tanto, realizou-se revisão narrativa que priorizou buscas na plataforma PubMed por meio dos seguintes descritores: "medicine and spirituality and secularismo" e "placebo effect and spirituality and medicine". Em seguida foram analisadas fontes referenciadas pela leitura dos artigos primordiais. Percebeu-se que há confusão quanto ao uso do termo espiritualidade e que a capacidade e efetividade do cuidado espiritual prestado por profissionais da saúde são débeis, contrastando com inúmeros benefícios oferecidos por essa atenção, que é uma ferramenta para um trabalho mais ético e humano.

Abstract Spirituality is a uniting force between different constituents of the human being and, when exercised, provides a harmonious experience and promotes balance between physical, social, and mental well-being. As such, this narrative review proposes a secular approach to how spirituality is understood by medicine, its influence on health, and how it is perceived by professionals and patients. Bibliographic search was conducted on the PubMed database, using the following descriptors: "medicine and spirituality and secularism" and "placebo effect and spirituality and medicine." After reading the primary articles, the referenced sources were analyzed. Results show a confusion on how the term spirituality is used and a weak capacity and effectiveness with respect to the spiritual care provided by health personnel, thus ignoring the several benefits offered by such care, which is a tool for a more ethical and humane work.

Resumen La espiritualidad es la fuerza que une los diferentes componentes del ser y al estimularse proporciona una experiencia armoniosa, además de promover el equilibrio de bienestar físico, social y mental. Ante lo anterior, este texto tuvo por objetivo abordar cómo se ve secularmente la espiritualidad en la medicina, su influencia en la salud y la percepción de profesionales y pacientes sobre este tema. Para ello, se realizó una revisión narrativa en la base de datos PubMed utilizando los siguientes descriptores: "medicine and spirituality and secularismo" y "placebo effect and spirituality and medicine". Después, se analizaron las fuentes mediante la lectura de los artículos principales. Se encontró una confusión con relación al uso del término espiritualidad, y es deficiente la habilidad y eficacia del cuidado espiritual que brindan los profesionales de la salud, contrastando con los numerosos beneficios de este cuidado, una herramienta para un trabajo más ético y humanizado.

Efecto placebo en otorrinolaringología: revisión de la literatura / Placebo effect in otorhinolaryngology: a narrative review

Resumen La palabra placebo ha sido usada, indistintamente, para referir a una sustancia o procedimiento que es "inerte" ("placebo") y al efecto que ocurre como consecuencia de la administración de un placebo ("efecto placebo"). El efecto placebo es un fenómeno psicobiológico que ha sido explicado desde el conductismo (condicionamiento clásico), desde fenómenos preconscientes (expectativas o "efecto placebo clásico"), desde el cognitivismo (disonancia cognitiva) y también a nivel neurobiológico. No obstante, los ensayos clínicos abiertos que verifican la respuesta a placebo desafían el mecanismo de la expectativa, dando lugar al análisis bayesiano, que integra sensaciones, experiencias, predicciones y claves del contexto; biológicamente, el efecto placebo no es inerte. Por tanto, el placebo ocupa un lugar relevante en la práctica clínica y en la investigación biomédica. Se realizó una búsqueda sistemática sobre placebo y otorrinolaringología en las bases de datos PubMed/Medline, SciELO y Cochrane Library. Se incluyeron estudios primarios y revisiones sistemáticas de la literatura. En cuanto a intervenciones placebo, la literatura publicada indica mejorías significativas en síntomas nasales y calidad de vida en rinitis alérgica (estacional y perenne) y disminución del dolor posoperatorio en amigdalectomía. En la enfermedad de Méniere, las intervenciones placebo son comparables a las de uso habitual, incluyendo las quirúrgicas. No se encontraron ensayos clínicos abiertos en otorrinolaringología ni evidencia sobre otras patologías del área. Las intervenciones y el efecto placebo abren un campo de investigación y desarrollo en otorrinolaringología que desafía la comprensión actual de las patologías, su funcionamiento, su tratamiento y la relación terapéutica.

Abstract The word placebo has been used interchangeably to refer to a substance or procedure that is "inert" ("placebo") and the effect that occurs as a consequence of its administration ("placebo effect"). The placebo effect corresponds to a psychobiological phenomenon that has been explained from behaviorism (classical conditioning), from preconscious phenomena (expectations or "classical placebo effect"), from cognitivism (cognitive dissonance) and at the neurobiological level as well. Nevertheless, some open-label trials that verify the response to placebo challenge the expectation mechanism, giving rise to Bayesian analysis, which integrates sensations, experiences, predictions and context clues; therefore, biologically, the placebo effect is not inert. The placebo has a relevant place both in clinical practice and in biomedical research. We conducted a systematic search on placebo and otolaryngology in PubMed/Medline, SciELO and Cochrane Library databases. We included primary studies and systematic reviews. Regarding placebo interventions, the available literature points out significant improvements in nasal symptoms and quality of life in allergic rhinitis (seasonal and perennial) and a decrease in post-tonsillectomy pain. In Méniére's disease, placebo interventions have demonstrated to be comparable to treatment-as-usual, including surgical interventions. No open-label clinical trials were found in otolaryngology, as well as no evidence on other diseases in the area. Placebo interventions and their effects open a field of research and development in otolaryngology, challenging the current understanding of pathologies, their functioning, their treatment and the therapeutic relationship.

Suplementação com açaí (Euterpe Oleracea Martius) para o tratamento do zumbido crônico: efeitos na percepção, níveis de ansiedade e biomarcadores de metabolismo oxidativo / Supplementation with açaí (Euterpe Oleracea Martius) for the treatment of chronic tinnitus: effects on perception, anxiety levels and oxidative metabolism biomarkers

RESUMO Objetivo Investigar os efeitos da suplementação antioxidante com extrato de açaí no incômodo com o zumbido crônico e a relação com os níveis de ansiedade e metabolismo oxidativo, não excluindo a sobreposição de enfermidades. Método Ensaio clínico, randomizado, controlado por placebo. Participaram 30 indivíduos, com média de 50,5 anos, 14 do sexo masculino e 16 do feminino, com limiares auditivos normais ou perda auditiva sensorioneural até grau leve bilateralmente, divididos em dois grupos: Grupo Placebo (sem ativo) e Grupo Açaí (100mg de extrato de açaí). Aplicaram-se os seguintes procedimentos antes e após três meses dos tratamentos: Tinnitus Handicap Inventory (THI), Inventário de Ansiedade de Beck (BAI) e amostras de sangue para avaliação de biomarcadores de estresse oxidativo (Peroxidação Lipídica e Carbonilação de proteínas). Resultados Houve redução do incômodo do zumbido para o grupo açaí, verificado por meio do THI (p=0,006). Diferenças significativas foram constatadas na pontuação dos sintomas comuns para os quadros de ansiedade no grupo placebo (p=0,016) porém, o mesmo não foi observado para os biomarcadores de metabolismo oxidativo, apesar de haver uma diminuição dos valores pós-tratamento para os grupos. Conclusão A suplementação antioxidante oral, com extrato de açaí, manifestou efeitos favoráveis no zumbido, reduzindo o desconforto com o sintoma, independente da etiologia de base, podendo ser considerada uma modalidade de tratamento. Entretanto, o efeito dessa suplementação nos sintomas de ansiedade e em biomarcadores de estresse oxidativo precisa de maior investigação.

ABSTRACT Purpose To investigate the effects of antioxidant supplementation with açaí extract on the discomfort with chronic tinnitus and the relationship with the levels of anxiety and oxidative metabolism, not excluding the overlap of diseases. Methods Randomized, placebo-controlled clinical trial. 30 individuals participated, with an average of 50.5 years, 14 males and 16 females, with normal hearing thresholds or sensorineural hearing loss up to mild degree, divided into two groups: Placebo Group (without active) and, Açaí Group (100mg of açaí extract). The following procedures were applied before and after three months of treatments: Tinnitus Handicap Inventory (THI), Beck's Anxiety Inventory (BAI) and blood samples for evaluation of oxidative stress biomarkers (Lipid Peroxidation and Protein Carbonylation). Results There was a reduction in the discomfort of tinnitus for the açaí group verified through THI (p = 0.006). Significant differences were found in the score of common symptoms for anxiety disorders in the placebo group (p = 0.016), however, the same was not observed for oxidative metabolism biomarkers, although there was a decrease in post-treatment values for all groups. Conclusion Oral antioxidant supplementation, with açaí extract, showed favorable effects on tinnitus, reducing discomfort with the symptom, regardless of the underlying etiology, and can be considered a treatment modality. However, the effect of this supplementation on anxiety symptoms and oxidative stress biomarkers needs further investigation.

El rol del placebo frente a los antidepresivos y aportes a la relación médico-paciente / Role of placebo versus antidepressants and contribution to the doctor-patient relationship

Resumen La literatura actual ofrece la posibilidad de aportar argumentos tanto a favor como en contra a la discusión sobre la eficacia de los medicamentos antidepresivos. Tanto la metodología, modelos de estudio y herramientas utilizadas para comparar la eficacia de los medicamentos plantean controversia. Este debate se agudiza al considerar la existencia del efecto placebo en resultados que promueven o cuestionan el uso de estos medicamentos. Entender los mecanismos de acción del placebo no solo permite una mejor comprensión de los resultados de la investigación con relación al uso de antidepresivos, sino que además respecto a la efectividad de los distintos tratamientos que hoy en día se utilizan en salud mental.

Current literature offers the possibility to contribute to the discussion about the effectiveness of antidepressants, with arguments both in favor and opposing it. Methodology, study models, and tools used to compare drug effectiveness, all raise controversy. This debate is intensified when involving the existence of placebo effect in results either promoting or questioning the use of these drugs. Understanding the mechanism of action of placebo not only allows for a better grasp of study results around antidepressant use but could also contribute to the effectiveness of distinct treatments used nowadays in mental health.

Actitudes de los médicos familiares mexicanos sobre el uso de placebos en la práctica clínica / Attitudes of Mexican family physicians on the use of placebos in clinical practice

Resumen Introducción: El uso de placebo se ha extendido en la práctica a pesar de ser polémico. En México, la práctica de medicina familiar es predominante institucional y trabaja con un cuadro básico de medicamentos. Objetivo: Determinar la frecuencia y actitud del médico familiar en la utilización de placebos en la práctica clínica. Método: Estudio transversal, observacional, multicéntrico, en 307 médicos familiares con práctica activa, en 27 estados de la República Mexicana. Se usó cuestionario con datos sociodemográficos, preguntas sobre frecuencia de uso y actitudes elaboradas por consenso. Se analizó con chi cuadrada. Resultados: 75 % utilizó placebos (IC 95 % = 69.7-79.4 %); 122 (39.7 %) placebos puros, principalmente agua (p < 0.05), y 220 (71.6 %) placebos impuros, principalmente vitaminas y exámenes de laboratorio. Los usaron más en pacientes con síntomas físicos no explicados médicamente (178, 45.5 %), incluidos 122 (31.2 %) pacientes “sanos preocupados” o con padecimientos crónicos (40, 12.5 %). Motivos de prescripción: 249 (81 %) por el efecto psicológico, cuando demostraron beneficio (176, 57 %), aun cuando implicara engaño (78, 25 %) o evidencia de eficacia insuficiente (57, 19 %). El principal motivo fue por insistencia del paciente. Conclusiones: Se utilizaron más placebos impuros, principalmente en pacientes sanos preocupados y en aquellos con padecimientos crónicos.

Abstract Introduction: The use of placebo has spread in clinical practice despite being controversial. In Mexico, the practice of family medicine is predominantly institutional and works with an essential medications list. Objective: To determine the frequency and family doctor attitude regarding the use of placebos in clinical practice. Method: Cross-sectional, observational, multicenter study of 307 family doctors with active practice in 27 states of the Mexican Republic. A questionnaire was used with sociodemographic data and consensus-developed questions about frequency of use and attitudes. For analysis, the square-chi test was used. Results: 75% used placebos (95% CI=69.7-79.4%); 122 (39.7%) used pure placebos, mainly water (p < 0.05), and 220 (71.6%), impure placebos, mainly vitamins and laboratory tests. They were used more in patients with medically unexplained physical symptoms (178, 45.5%), including 122 (31.2%) “healthy worried” patients, or who had chronic conditions (40, 12.5%). Reasons for prescription: 249 (81%) for the psychological effect, when they showed benefit (176, 57%), even when it implied deceiving (78, 25%) or insufficient evidence of efficacy (57, 19%). The main reason was because of patient insistence. Conclusions: More impure placebos were used, mainly in healthy worried patients and in those with chronic conditions.

La crítica y la educación médica: hacia un conocimiento liberador. Parte II / Critique and medical education: towards liberating knowledge. Part II

Resumen La crítica del quehacer médico como espacio educativo implicó caracterizar el entramado de lógicas, ideas y prácticas prevalentes: la disyunción y el reduccionismo; el binomio salud-enfermedad; la historia natural de la enfermedad; la medicalización de la vida social; la tecnologización deshumanizante de la práctica médica, y la medicina supresora reduccionista. La crítica continúa discutiendo la contribución de ese entramado al control social como agente de la dominación de los intereses de lucro sin límites y como expresión del poder de la industria de la salud, justificándose con la argumentación de alternativas tendientes a superar ese entramado: la lógica transdisciplinaria y el concepto de organismo como totalidad jerarquizada e interactuante con su entorno respecto de la disyunción y el reduccionismo; la historia cultural de la enfermedad como alternativa a la historia natural de la enfermedad y al binomio salud-enfermedad; el bien vivir, la búsqueda de la superación espiritual, intelectual, moral y convivencial que confiere sentido profundo a la vida humana, como alternativa a la medicalización y antídoto de la tecnologización deshumanizante y los rasgos degradantes; la medicina estimulante de fuerzas curativas endógenas para afecciones crónicas no trasmisibles, cuyo fundamento de factibilidad y credibilidad radica en la omnipresencia del efecto placebo con respecto a la medicina supresora, basada en fármacos con efectos secundarios indefectibles. Sin una educación basada en la crítica, difícilmente el conocimiento liberador podrá acompañar y orientar a médicos y otros profesionales a organizarse en la búsqueda, desde su ámbito, de un mundo inclusivo, igualitario, justo, solidario y cuidadoso del ecosistema planetario.

Abstract The critique of medicine begins at unveiling and specifying its network of predominant logics, ideas and practices: logics of disjunction and reductionism; the health-disease binomial; the natural history of the disease; the medicalization of social life; the dehumanizing technologization of medical practice and reductionist suppressive medicine. It goes on to argue about its role as agents of domination of limitless profit interests and as an expression of the power of the health industry, justifying itself with the proposal of alternatives tending to overcome that network: transdisciplinarity and the concept of organism as hierarchical totality and interacting with its environment, with respect to disjunction and reductionism; the cultural history of the disease in relation to the health-disease binomial and the dehumanizing technologization; good living, the search for spiritual, intellectual, moral and coexistence growth as meaning of human life, as an alternative to the medicalization and antidote of degrading traits and stimulating medicine of the endogenous healing forces of the organism whose foundation of possibility and credibility is the placebo effect as an alternative to suppressive therapy for non-communicable chronic conditions, based on the pharmacological effect with unfailing side effects. It concludes that without an education based on critique, liberating knowledge would hardly accompany and guide the various social groups in the search for an inclusive, pluralistic, egalitarian, fair, solidary and caring of the planetary ecosystem world.

Comparison of Vitex agnus-castus Extracts with Placebo in Reducing Menopausal Symptoms: A Randomized Double-Blind Study / 가정의학회지

BACKGROUND: Menopausal symptoms have remarkable negative effects on women's quality of life, justifying the need to assess various therapeutic options. This research aimed to determine the effectiveness of Vitex agnus-castus extracts in alleviating menopausal symptoms in comparison with that of placebo. METHODS: This study was a randomized controlled double-blind clinical trial with a study group of 52 women referred to a clinic in Kermanshah in 2017. The participants were randomly divided into two groups: Vitex group (26 subjects) and placebo group (26 subjects). Menopausal symptoms were assessed using the Greene Scale before and 8 weeks after the intervention. RESULTS: After the intervention, the mean scores for total menopausal disorder, anxiety, and vasomotor dysfunction were significantly lower in the Vitex group than in the placebo group (P0.05). CONCLUSION: Administration of Vitex agnus-castus extracts as a phytoestrogenic medicine can alleviate menopausal symptoms in women.

Inhaled Corticosteroids and Placebo Treatment Effects in Adult Patients With Cough: A Systematic Review and Meta-analysis

PURPOSE: Inhaled corticosteroids (ICSs) are often considered an empirical therapy in the management of patients with cough. However, ICS responsiveness is difficult to interpret in daily clinical practice, as the improvements may include placebo effects or self-remission. We aimed to evaluate ICS and placebo treatment effects in adult patients with cough. METHODS: Electronic databases were searched for studies published until June 2018, without language restriction. Randomized controlled trials reporting the effects of ICSs compared with placebo in adult patients with cough were included. Random effects meta-analyses were conducted to estimate the treatment effects. Therapeutic gain was calculated by subtracting the percentage change from baseline in the cough score in the ICS treatment group from that in the placebo treatment group. RESULTS: A total of 9 studies were identified and 8 studies measuring cough severity outcomes were included for meta-analyses. Therapeutic gain from ICSs ranged from −5.0% to +94.6% across the studies included; however, it did not exceed +22%, except for an outlier reporting very high therapeutic gains (+45.6% to +94.6%, depending on outcomes). Overall ICS treatment effects in cough severity outcomes were small-to-moderate (standardized mean difference [SMD], −0.38; 95% confidence interval [CI], −0.54, −0.23), which were comparable between subacute and chronic coughs. However, pooled placebo treatment effects were very large in subacute cough (SMD, −2.58; 95% CI, −3.03, −2.1), and modest but significant in chronic cough (SMD, −0.46; 95% CI, −0.72, −0.21). CONCLUSIONS: Overall therapeutic gain from ICSs is small-to-moderate. However, placebo treatment effects of ICS are large in subacute cough, and modest but still significant in chronic cough. These findings indicate the need for careful interpretation of ICS responsiveness in the management of cough patients in the clinic, and also for rigorous patient selection to identify ICS-responders.

Progress of researches on non-specific effect of acupuncture / 针刺研究

Acupuncture therapy is effective in the treatment of quite a lot of clinical conditions. Accumulating evidence demonstrates that acupuncture therapy not only has specific therapeutic effects, but also in a large part has non-specific effects such as the patient's and/or acupuncture practitioner's "unity of form and spirit", "treatment experience and environment" and "expectations and trust", etc. In the present article, we make a review about progresses of recent researches on the non-specific effect of acupuncture therapy and its influencing factors from 1) placebo acupuncture, 2) expectancy effect, 3) Hawthorne effect, and 4) Pygmalion effect. The placebo acupuncture intervention may enhance the therapeutic effect by triggering the cutaneous somatosensory afferents, brainstem, hypothalamus, limbic system, etc. to produce cognitive and emotional responses. The patient's expectancy and belief about acupuncture analgesia are associated with activities of the spino-thalamo-cortical pathway, cingulate gyrus, endogenous opioid system, emotional and reward circuits, etc. Regarding the Hawthorne effect and Pygmalion effect, it is supposed that the patients' behavioral tendency changes and higher expectations for acupuncture treatment may produce a positive impact on the outcomes of treatment. In-depth exploration of the influencing factors and the therapeutic targets of acupuncture treatment will further improve clinical effect, and serve the patients better.

Medicina supresora y medicina estimulante: una mirada penetrante de la práctica médica / Suppressive medicine and stimulant medicine: a penetrating view in medical practice

Resumen: La teoría de la medicina supresora (MS) y la medicina estimulante (ME) destaca dos formas radicalmente distintas de entender la enfermedad y de enfrentarla. Para la MS es un objeto extraño o ajeno al organismo que hay que disminuir o destruir (suprimir); para la ME es un trastorno de la armonía interna que requiere fortalecer o avivar el organismo para restablecerla (estimular). En la medicina moderna, el poder de la industria de la salud favorece el predominio de la MS, por su alta rentabilidad, y la marginación de las medicinas alternativas (MA), poco rentables que, al igual que la vacunación o las terapias sustitutivas y regenerativas, son formas de ME. El efecto placebo (EP) inherente a la práctica médica, revelador de fuerzas curativas endógenas susceptibles de estimulación, da sentido a la ME y credibilidad a las MA. La dirección del EP de lo macro (psicosocial) a lo micro (físico-químico) explica su alta especificidad y ausencia de efectos secundarios. El efecto farmacológico de lo micro a lo macro, opuesto a las fuerzas endógenas, conlleva indefectiblemente efectos secundarios que requieren ulteriores supresiones y dosis repetidas indefinidamente. Se analizan equívocos de la ciencia con respecto al EP y al imponer a las MA criterios metódicos propios de la MS, que las desvirtúa, descalifica y excluye como objetos de conocimiento. Se insiste en la necesidad de reconocer la ME y rescatar las MA para la indagación, a fin de explorar sinergias, complementos o reemplazos con relación a la MS en la búsqueda del bien vivir.

Abstract: The theory of suppressive (SuM) and stimulant (StM) medicine highlights two radically different ways of understanding and coping with diseases. For SuM it is a strange or foreign object to the organism that must be diminished or destroyed (suppressed); for StM it is a disorder of internal harmony that requires strengthening or enlivening the body to re-establish it (stimulate). In modern medicine, the power in the health industry favors the predominance of SuM, because of its high profitability, and the marginalization of low-cost alternative medicines (AM) that, like vaccination or substitutive and regenerative therapies, are forms of StM. The placebo effect (PE) inherent to medical practice, revealing of endogenous curative forces susceptible to stimulation, gives meaning to StM and credibility to AM. The direction of the PE from the macro (psychosocial) to the micro (physical-chemical) explains its high specificity and absence of side effects. The pharmacological effect of the micro to the macro, opposed to the endogenous forces, inevitably entails side effects that require further suppression and indefinite repetition of doses. Scientific assertions that misunderstand PE, and impose on the AM methodical criteria of the SuM that detract, disqualify and exclude them as objects of knowledge, are analyzed. The emphasis is on the need to recognize the StM and rescue the AM for inquiry in order to explore synergies, complements or replacements in relation to the SuM, in the quest for to live well.

Effects of acupoint specificity on claustrophobia / 中国针灸

OBJECTIVE@#To observe the effectiveness of acupuncture on claustrophobia, and to explore the effects of acupoint specificity on claustrophobia.@*METHODS@#This was an evaluator-blinded randomized controlled trial. One hundred and sixty patients who presented with claustrophobia during magnetic resonance imaging examination were randomized into an acupoint group, a non-acupoint group, a sham-acupoint group and a blank group, 40 cases in each one. The patients in the acupoint group were treated with acupuncture at Zhaohai (KI 6), Taichong (LR 3), Lingdao (HT 4), Neiguan (PC 6), Shenmen (HT 7), Danzhong (CV 17), Baihui (GV 20) and Fengchi (GB 20). The patients in the non-acupoint group were treated with acupuncture at points 0.5 next to the acupoints above. The patients in the sham-acupoint group were treated with acupuncture at acupoints not closely correlated to claustrophobia in corresponding segment. All the acupuncture was given once. No treatment was used in the blank group. The state anxiety questionnaire (S-AI) was observed in all the patients at the end of MRI examination before and after treatment. The clinical therapeutic effects were compared among four groups.@*RESULTS@#Compared before treatment, the S-AI score was reduced in the acupoint group, non-acupoint group and sham-acupoint group after treatment (0.05). After treatment, the S-AI scores in the acupoint group, non-acupoint group and sham-acupoint group was lower than that in the blank group (<0.05, <0.01), and the differences of S-AI score were higher than that in the blank group (<0.01). The S-AI score in the acupoint group was lower than that in the non-acupoint group and sham-acupoint group (<0.05), and the difference of S-AI score was higher than those in the non-acupoint group and sham-acupoint group (<0.05). The difference of S-AI score in the non-acupoint group was higher than that in sham-acupoint group (<0.05). The total effective rate was 92.5% (37/40) in the acupoint group, which was significantly superior to 25.0% (10/40) in the non- acupoint group, 17.5% (7/40) in the sham-acupoint group and 5.0% (2/40) in the blank group (<0.05, <0.01).@*CONCLUSION@#Acupuncture showes superior effect on claustrophobia, and its tranquilizing effect may be related with acupoint specificity.

Vigencia del efecto placebo: su biología desde la genética a la conducta / Biological and genetic mechanisms underlying the placebo effect

The placebo effect has been seldom studied in the history of medicine. However, during the last decades, the great impact of this phenomenon in clinical practice, ranging from surgical to psychiatric field, has been revealed. Research elucidated both the psychological mechanisms and genetic polymorphisms that affect the susceptibility of individuals to express this phenomenon. We herein review the psychological mechanisms, brain structures (anterior cingulate cortex, nucleus accumbens, dorsolateral prefrontal cortex, insular cortex, thalamus) and neurotransmission systems involved (opioid, dopaminergic, cannabinoid, serotoninergic, cholecystokinin). These are the clue to recognize the polymorphisms that have been identified so far. The biological basis of both the placebo effect and its alter ego, the nocebo effect, are well recognized, and related to corresponding psychological processes. Finally, the implications of the findings in clinical practice and medical training are discussed.

The placebo effects of acupuncture and moxibustion / 中国针灸

The role of placebo effect in acupuncture and moxibustion efficacy was explored. Through the analysis of multiple factors including trust, expectation, understanding, doctor-patient relationship and social cultural environment, etc. in the literature at home and abroad, it was found the placebo effects, including patient's cognition, expectation, attention, preference and communication with doctor as well as doctor's suggestion, expectation and indirect regulation of diagnosis and treatment environment on patient's psychology, were essential factors for acupuncture efficacy. Therefore, it was concluded that the placebo effect was an inseparable part of acupuncture efficacy.

Expectativas en la Manifestación del Efecto Placebo en Universitarios, y su Relación con Ansiedad y Sugestionabilidad

A lo largo del tiempo, se han estudiado las implicaciones biológicas del efecto placebo, muchas veces sin ir más allá del ámbito farmacológico. Por tal motivo, se decidió llevar a cabo un estudio experimental de tres grupos (uno control y dos experimentales) que permitiera explorar las implicaciones de este fenómeno en un proceso cognitivo: la memoria de trabajo. De esta forma, se indujeron expectativas opuestas y paralelas en los grupos experimentales, respectivamente, para determinar la influencia de éstas en la manifestación del efecto placebo. Se encontró que las expectativas de un sujeto sobre la eficacia de un producto, pueden mejorar o empeorar la capacidad de éstos para recordar una serie de palabras. Asimismo, se estudió la relación entre placebo y variables psicológicas (ansiedad y sugestionabilidad), encontrando ausencia de correlación positiva entre dichas variables, lo que contradice los hallazgos reportados por otros investigadores.

Across the time, have been studied the biological implications of the placebo effect, many times without going beyond the pharmacological field. For this reason, it was decided to conduct a three groups experimental study (a control group and two experimental groups) to know the implications of this phenomenon in a cognitive process: working memory. That way, there was inducted parallel and opposite expectations in the experimental groups, respectively, to know the influence of these expectations in the manifestation of the placebo effect. It was found that someone's expectations about a product effectiveness can improve or worse their ability to remember a series of words. In addition, it was studied the relationship between placebo and psychological variables (anxiety and suggestibility), finding no positive correlation between these variables, which contradicts the findings reported by other researchers.

Intervenciones Placebo Para Incrementar el Rendimiento Deportivo: un Tema Revisitado / Placebo Interventions to Enhance Sports Performance: Revisiting an Issue / Intervenções Placebo para Aumentar o Rendimento Esportivo: um Tema Revisitado

Las intervenciones psicológicas para incrementar el rendimiento de los deportistas han ganado gran popularidad. En este artículo se realizó una revisión de la utilización de intervenciones placebo para potenciar el rendimiento deportivo, a partir de la cual se concluyó que el contexto de aplicación, los rasgos de personalidad del deportista y el ritual de intervención han sido propuestos como los factores más relevantes a tomar en consideración. Se estima que, a pesar de las limitaciones, las intervenciones placebo constituyen alternativas eficaces que tienen distintos modos de aplicación. La utilización de vías conscientes y no-conscientes para activar el efecto placebo se materializa en el empleo de las potencialidades que brindan tanto la sugestión verbal como el priming.

Psychological interventions aimed at enhancing the performance of athletes have become increasingly popular. This article reviews the use of placebo interventions to enhance sports performance and finds that the context of application, the athlete's personality traits, and the intervention ritual are usually the most relevant factors to consider. The article proposes that, despite their limitations, placebo interventions are effective alternatives that can be applied in different ways. The use of both conscious and unconscious means to activate the placebo effect takes the form of verbal suggestion and priming.

As intervenções psicológicas para aumentar o rendimento dos esportistas têm ganhado grande popularidade. Neste artigo, realizou-se uma revisão da utilização de intervenções placebo para potencializar o rendimento esportivo, a partir da qual se concluiu que o contexto de aplicação, os traços de personalidade do esportista e o ritual de intervenção foram propostos como fatores mais relevantes a considerar. Estima-se que, apesar das limitações, as intervenções placebo constituem alternativas eficazes que têm diferentes modos de aplicação. A utilização de vias conscientes e não conscientes para ativar o efeito placebo se materializa no emprego das potencialidades que oferecem tanto a sugestão verbal quanto o priming.

Revisión narrativa de la literatura sobre manejo con medicina homeopàtica de pacientes con síntomas de gastritis / Narrative review of the literature on management with homeopathic medicine of patients with symptoms of gastritis

Las enfermedades del aparato digestivo son frecuentes y en ocasiones incapacitantes para la vida diaria y laboral. Dentro de ellas la gastritis es una de las que más incidencia tiene en el mundo entero. En gran parte de los casos la gastritis está acompañada de la infección por Helicobacter Pylori, bacteria que está relacionada con el cáncer de estómago. Los tratamientos que actualmente se llevan a cabo en la medicina tradicional, además de que son muy agresivos, todavía dejan muchas dudas sobre sus efectos secundarios y los daños que pueden llegar a provocar en el organismo, dentro de ellos el cáncer. Por eso mismo se ha visto el incremento en la utilización de las terapias alternativas para el manejo de la gastritis, dentro de ellas la homeopatía, la cual ha tenido una muy buena aceptación y resultados, pero desafortunadamente, todos estos avances no están lo suficientemente documentados. Para la realización de éste trabajo primero se hizo una Revisión Narrativa de la Literatura existente en los últimos 20 años, encontrando en las bases de datos que algunos remedios homeopáticos han demostrado resultados favorables en el manejo de la gastritis y tienen publicaciones muy interesantes en la literatura, pero la gran mayoría de remedios sólo se encuentran relacionados en las materias médicas. Sin embargo, este trabajo logró establecer los medicamentos homeopáticos útiles en la gastritis basándose en los síntomas que reportan las principales Medicinas Internas conocidas, como son las de: Harrison, Cecil y Farreras. Tomando éstos síntomas se pasaron al lenguaje repertorial homeopático, luego se realizó un ejercicio repertorial que nos revela varios remedios policrestos muy valiosos para el manejo de los síntomas de la gastritis. Además se realizó otra repertorización buscando sólo remedios pequeños, que nos pone delante de los ojos, opciones medicamentosas muy útiles que probablemente nunca habríamos pensado. Dentro de los remedios policrestos y semipolicrestos que se encontró tenían la mejor cobertura de síntomas de gastritis están: Arsenicum álbum, Nux vómica, Sulphuricumacidum, Sulphur, Magnesia carbónica, Lycopodium, KaliBichromicum, Iris Versicolor, Graphites, Crocus sativa, Carbovegetabilis, ArgentumNitricum, Bismuthum, Anacardiumorientale, Phosphorus, Plumbummetallicum, Bryonia, NatrumMuriaticum, Lachesis, China officinalis y Pulsatilla. Dentro de los pequeños remedios se encontraron en los primeros 5 lugares: ArsenicumIodatum, Tabacum, SecaleCornutum, FerrumPhosphoricum y Oxalicumacidum; los cuales son incluidos en la tabla de resultados de medicamentos para gastritis, junto con los policrestos y otros remedios de gran valor en el manejo de la gastritis. Este trabajo será de gran ayuda y motivación especialmente para los médicos que trabajamos con la homeopatía, para seguir publicando cada vez con mayor dedicación y detalle con el fin de dar a conocer todas las maravillas que la homeopatía nos demuestra día a día.

Revisión narrativa del manejo de pacientes con síntomas de asma con tratamiento basado en homeopatía 2015 / Narrative review of the management of patients with asthma symptoms with treatment based on homeopathy 2015

El asma es una de las enfermedades respiratorias crónicas más frecuentes a nivel mundial, ocupando uno de los primeros lugares de morbilidad en Colombia. debido a que la medicina tradicional no ofrece sino una mejoría parcial o temporal, la comunidad ha buscado otras alternativas terapéuticas, dándose un gran apertura a las terapias alternativas, incluyendo a la homeopatía, que a través de los años ha demostrado resultados muy favorables en el manejo de ésta. En este trabajo se realizó una revisión documental sobre el manejo del asma con homeopatía, en los últimos 10 años, con el fin de proporcionar evidencia confiable para una buena toma de decisiones en salud y profundizar en el conocimiento de éste tema. Se tomaron los síntomas del Asma referidos en los libros de Medicina Interna (Harrison, Cecil y Farreras-Rozman); se convirtieron a lenguaje repertorial homeopático, y se realizó el ejercicio repertorial, encontrándose que los principales medicamentos son: Arsenicum album, Phosphurus, Sulphur, Antimonium tartaricum, Lachesis, Psorinum, Medorrhinum, Nux vómica, Dulcamara, Ignatia, Sambucus nigra, Belladona, Lobelia inflata, Ipecacuana, Grindelia, Cuprum metallicum, Aconitum napellus, Apis mellifica, Kali carbonicum, Nitricum acidum; de los cuales profundizaremos en los más usados. En los diferentes artículos encontramos los medicamentos más usados, los cuales los ponemos en una tabla con sus respectivas indicaciones de acuerdo a la sintomatología

El placebo y el efecto placebo / Placebo and placebo effect

Se denomina placebo a una intervención diseñada para simular una terapia médica, que no tiene efectos específicos para la condición que está siendo aplicada. El efecto placebo es la modificación, muchas veces fisiológicamente demostrable, que se produce en el organismo como resultado del estímulo psicológico inducido por la administración de una sustancia inerte, de un fármaco o de un tratamiento. En este trabajo se abordan las definiciones de placebo, el origen de este término, los factores y mecanismos que intervienen en el efecto placebo, así como el uso de los placebos en la práctica médica y en la investigación clínica...

Placebo is an intervention designed to simulate a medical therapy, which has no specific effects for the condition that is being applied. The placebo effect is the change, often physiologically provable, which is produced in the body as a result of a psychological stimulus induced by the administration of an inert substance, a drug or a treatment. We hereby include the definition of placebo, the origin of this word, the factors and mechanisms involved in the placebo effect, and the use of placebos in medical practice and clinical research...

Considerações atuais sobre o uso do placebo: uma revisão de literatura / Current considerations relate to the use of placebo: a literature review

Apesar do efeito placebo já representar um fenômeno reconhecido em medicina e pesquisa seu mecanismo de ação até agora ainda não foram completamente entendidos. O efeito placebo é o resultado da administração de uma substância que não apresente efeito farmacológico sobre o problema a ser tratado, mas com uma aparência similar ao agente ativo que está sendo comparado. O efeito placebo é mais eficaz do que o não tratamento em estudos clínicos. Na medicina, diversos investigadores perceberam que seria importante obter uma maior compreensão do efeito placebo nos estudos clínicos. Apesar do maior interesse quando da incorporação de placebos nos estudo clínicos, o entendimento da resposta placebo parece ser fundamental. Esta revisão da literatura abordou alguns mecanismos do uso de placebo e suas implicações na prática clínica. Observamos que progressos estão sendo feitos principalmente em medicina, mas verificamos que em odontologia estes estudos ainda são raros.

Although placebo effect is a common phenomenon in medicine and research, its mechanism so far are not well understood. The placebo effect is the result of administration of a substance with no pharmacological effect on the problem to be treated, but with a similar appearance to the active product to which it is being compared, and is seen to be more efficacious than an untreated control group. In medicine many researchers have realized that much could be gained by a better understanding of placebo effects and, therefore, have taken a keen interest in this area. Despite improvements in the placebo groups are commonly observed in randomized clinical trial it seem important to identify the mechanism under lying these placebo responses. In this article, we review some theories on placebo mechanisms and their implications for clinical practice. We concluded that considerable progress has been made in understanding placebo effects in medicine, however, we noted that there has been relatively little studies of the scope of placebo phenomena in Dentistry then only scarce knowledge relate placebo is available in this field.