Antifungal Activity of Mexican Propolis on Clinical Isolates of Candida Species.

Infections caused by micro-organisms of the genus Candida are becoming a growing health problem worldwide. These fungi are opportunistic commensals that can produce infections-clinically known as candidiasis-in immunocompromised individuals. The indiscriminate use of different anti-fungal treatments has triggered the resistance of Candida species to currently used therapies. In this sense, propolis has been shown to have potent antimicrobial properties and thus can be used as an approach for the inhibition of Candida species. Therefore, this work aims to evaluate the anti-Candida effects of a propolis extract obtained from the north of Mexico on clinical isolates of Candida species. Candida species were specifically identified from oral lesions, and both the qualitative and quantitative anti-Candida effects of the Mexican propolis were evaluated, as well as its inhibitory effect on C. albicans isolate's germ tube growth and chemical composition. Three Candida species were identified, and our results indicated that the inhibition halos of the propolis ranged from 7.6 to 21.43 mm, while that of the MFC and FC50 ranged from 0.312 to 1.25 and 0.014 to 0.244 mg/mL, respectively. Moreover, the propolis was found to inhibit germ tube formation (IC50 ranging from 0.030 to 1.291 mg/mL). Chemical composition analysis indicated the presence of flavonoids, including pinocembrin, baicalein, pinobanksin chalcone, rhamnetin, and biochanin A, in the Mexican propolis extract. In summary, our work shows that Mexican propolis presents significant anti-Candida effects related to its chemical composition, and also inhibits germ tube growth. Other Candida species virulence factors should be investigated in future research in order to determine the mechanisms associated with antifungal effects against them.

Anacardic Acids from Amphipterygium adstringens Confer Cytoprotection against 5-Fluorouracil and Carboplatin Induced Blood Cell Toxicity While Increasing Antitumoral Activity and Survival in an Animal Model of Breast Cancer.

Amphipterygium adstringens (cuachalalate) contains anacardic acids (AAs) such as 6-pentadecyl salicylic acid (6SA) that show immunomodulatory and antitumor activity with minimal or no secondary adverse effects. By contrast, most chemotherapeutic agents, such as 5-fluorouracil (5-FU) and carboplatin (CbPt), induce myelosuppression and leukopenia. Here, we investigated the myeloprotective and antineoplastic potential of an AA extract or the 6SA as monotherapy or in combination with commonly used chemotherapeutic agents (5-FU and CbPt) to determine the cytoprotective action of 6SA on immune cells. Treatment of Balb/c breast tumor-bearing female mice with an AA mixture or 6SA did not induce the myelosuppression or leukopenia observed with 5-FU and CbPt. The co-administration of AA mixture or isolated 6SA with 5-FU or CbPt reduced the apoptosis of circulating blood cells and bone marrow cells. Treatment of 4T1 breast tumor-bearing mice with the AA mixture or 6SA reduced tumor growth and lung metastasis and increased the survival rate compared with monotherapies. An increased effect was observed in tumor reduction with the combination of 6SA and CbPt. In conclusion, AAs have important myeloprotective and antineoplastic effects, and they can improve the efficiency of chemotherapeutics, thereby protecting the organism against the toxic effects of drugs such as 5-FU and CbPt.

[Cost-utility analysis: Mechanical thrombectomy plus thrombolysis in ischemic stroke due to large vessel occlusion in the public sector in Chile]. / Análisis de costo utilidad: trombectomía mecánica más trombólisis en accidente vascular cerebral isquémico debido a oclusión de grandes vasos en el sector público en Chile.

INTRODUCTION: Several studies demonstrate the therapeutic superiority of thrombolysis plus mechanical thrombectomy versus thrombolysis alone to treat stroke. OBJECTIVE: To analyze the cost-utility of thrombolysis plus mechanical thrombectomy versus thrombolysis in patients with ischemic stroke due to large vessel occlusion. METHODS: Cost-utility analysis. The model used is blended: Decision Tree (first 90 days) and Markov in the long term, of seven health states based on a disease-specific scale, from the Chilean public insurance and societal perspective. Quality-Adjusted Life-Years and costs are evaluated. Deterministic (DSA) and probabilistic (PSA) analyses were carried out. RESULTS: From the public insurance perspective, in the base case, mechanical thrombectomy is associated with lower costs in a lifetime horizon, and with higher benefits (2.63 incremental QALYs, and 1.19 discounted incremental life years), at a Net Monetary Benefit (NMB) of CLP 37,289,874, and an Incremental Cost-Utility Ratio (ICUR) of CLP 3,807,413/QALY. For the scenario that incorporates access to rehabilitation, 2.54 incremental QALYs and 1.13 discounted life years were estimated, resulting in an NMB of CLP 35,670,319 and ICUR of CLP 3,960,624/QALY. In the scenario that incorporates access to long-term care from a societal perspective, the ICUR falls to CLP 951,911/QALY, and the NMB raises to CLP 43,318,072, improving the previous scenarios. In the DSA, health states, starting age, and relative risk of dying were the variables with the greatest influence. The PSA for the base case corroborated the estimates. CONCLUSIONS: Thrombolysis plus mechanical thrombectomy adds quality of life at costs acceptable for decision-makers versus thrombolysis alone. The results are consistent with international studies.

INTRODUCCIÓN: Diversos estudios demuestran la superioridad terapéutica de la trombólisis más trombectomía mecánica, versus trombólisis sola, en el tratamiento del accidente vascular cerebral. OBJETIVOS: Analizar el costo utilidad de la trombólisis más trombectomía versus trombólisis sola en pacientes con accidente vascular cerebral isquémico con oclusión de grandes vasos. MÉTODOS: Evaluación de costo utilidad. Se ha utilizado un modelo mixto: árbol de decisión (primeros 90 días) y Markov en el largo plazo, de siete estados de salud definidos en escala específica de enfermedad, desde la perspectiva del seguro público chileno y societal. Se evalúan costos y años de vida ajustados por calidad. Se realizó análisis de incertidumbre determinístico y probabilístico. RESULTADOS: Bajo la perspectiva de seguro público, en el caso base la trombectomía mecánica se relaciona con menores costos en un horizonte de por vida, con mayores beneficios (2,63 años de vida ajustados por calidad incrementales, y 1,19 años de vida incrementales descontados), a un beneficio monetario neto de $37 289 874 pesos chilenos, y una razón incremental de costo utilidad de $3 807 413 pesos por años de vida ajustados por calidad. Para el escenario que agrega acceso a rehabilitación se estimaron 2,54 años de vida ajustados por calidad incremental y 1,13 años de vida descontados, resultando en un beneficio monetario neto de $35 670 319 pesos y razón incremental de costo utilidad de $3 960 624 pesos por años de vida ajustados por calidad. En el escenario que agrega el efecto de acceso a cuidados de larga duración con perspectiva societal, la razón incremental de costo utilidad cae hasta $951 911 pesos por años de vida ajustados por calidad y el beneficio monetario neto se eleva a $43 318 072 pesos, superando las estimaciones anteriores. En el análisis de incertidumbre determinístico, los estados de salud, edad de inicio de la cohorte y riesgo relativo de morir, fueron las variables con mayor influencia. El análisis de incertidumbre probabilístico para el caso base, corroboró las estimaciones. CONCLUSIONES: La trombólisis más trombectomía mecánica agrega calidad de vida a costos aceptables por el tomador de decisión, versus trombólisis sola. Los resultados son consistentes con los estudios internacionales.

[Characterization and analysis of the basic elements of health payment mechanisms and their most frequent types]. / Caracterización y análisis de los elementos básicos de los mecanismos de pago en salud y tipologías más frecuentes.

INTRODUCTION: Healthcare systems are developed in imperfect scenarios, in which there are constant failures (uncertainty, information asymmetry, agency relationship problem, and supply-induced demand). These failures, based on the imperfection of the sector, determine the relationships and incentives between the actors. It is within this context that payment mechanisms regulate aspects of the system behavior and incentives, acting as instruments for the purchasing of health care from providers, mediated by health insurance on behalf of users. OBJECTIVE: To characterize the basic elements of most frequent payment mechanisms to help providers in their relationship with payers. METHODS: A review of the evidence was conducted in PubMed, Google, Google Scholar, and strategic snowball selection. Payment mechanisms consist of three classical microeconomics variables, fixed or variable: price, quantity, and expense. Time dimensions are used to analyze their attributes and effects. Different mechanisms emerge from the combination of these variables. RESULTS: Among the most used are: Fee-For-Service, Global Budget, Bundled Payments, Diagnosis-Related Groups, Per-capita, Performance Pay, and Risk-Sharing Agreements. A fourth has also gained importance: Financial Risk. CONCLUSIONS: Payment mechanisms are essential to link health efforts with clinical practice. They make it possible to regulate relationships between insurers, providers, and users, which, depending on the architecture of the mechanism, can become beneficial or hinder the fulfillment of the objectives of the health system.

INTRODUCCIÓN: Los sistemas de salud se desarrollan en ámbitos complejos y con fallas constantes (incertidumbre, asimetría de información, problema de relación de agencia e inducción de demanda). Estas fallas determinan las relaciones e incentivos entre los actores y se basan en la imperfección del sector. Frente a ello, los mecanismos de pago regulan aspectos del comportamiento e incentivos del sistema, participando como instrumentos de compra de atenciones de salud a prestadores, mediados por los seguros de salud en representación de los usuarios. OBJETIVO: Caracterizar los elementos básicos de las tipologías más frecuentes de los mecanismos de pago con el propósito de para apoyar la labor de los prestadores en su relación con pagadores. MÉTODOS: Se condujo una revisión dirigida de la evidencia en PubMed, Google, Google Scholar y selección estratégica en bola de nieve. Los mecanismos de pago están conformados por tres variables microeconómicas clásicas fijas o variables: precio, cantidad y gasto; y dimensiones temporales utilizadas para analizar sus atributos y efectos. De la combinación de estas variables surgen distintos mecanismos. RESULTADOS: Entre los más utilizados se describen: pago por servicio, presupuesto global, Bundled Payments, grupos relacionados de diagnóstico, per cápita, pago por desempeño y acuerdos de riesgo compartido. Dentro de sus variables ha cobrado importancia una cuarta, el riesgo financiero. CONCLUSIONES: Los mecanismos de pago resultan esenciales para concatenar esfuerzos sanitarios con la práctica clínica. Permiten regular relaciones entre seguros, prestadores y usuarios. Dependiendo de la arquitectura del mecanismo, estas pueden tornarse beneficiosas o entorpecer el cumplimiento de los objetivos del sistema sanitario.

Caracterización y análisis de los elementos básicos de los mecanismos de pago en salud y tipologías más frecuentes / Characterization and analysis of the basic elements of health payment mechanisms and their most frequent types

INTRODUCCIÓN: Los sistemas de salud se desarrollan en ámbitos complejos y con fallas constantes (incertidumbre, asimetría de información, problema de relación de agencia e inducción de demanda). Estas fallas determinan las relaciones e incentivos entre los actores y se basan en la imperfección del sector. Frente a ello, los mecanismos de pago regulan aspectos del comportamiento e incentivos del sistema, participando como instrumentos de compra de atenciones de salud a prestadores, mediados por los seguros de salud en representación de los usuarios. OBJETIVO: Caracterizar los elementos básicos de las tipologías más frecuentes de los mecanismos de pago con el propósito de para apoyar la labor de los prestadores en su relación con pagadores. MÉTODOS: Se condujo una revisión dirigida de la evidencia en PubMed, Google, Google Scholar y selección estratégica en bola de nieve. Los mecanismos de pago están conformados por tres variables microeconómicas clásicas fijas o variables: precio, cantidad y gasto; y dimensiones temporales utilizadas para analizar sus atributos y efectos. De la combinación de estas variables surgen distintos mecanismos. RESULTADOS: Entre los más utilizados se describen: pago por servicio, presupuesto global, Bundled Payments, grupos relacionados de diagnóstico, per cápita, pago por desempeño y acuerdos de riesgo compartido. Dentro de sus variables ha cobrado importancia una cuarta, el riesgo financiero. CONCLUSIONES: Los mecanismos de pago resultan esenciales para concatenar esfuerzos sanitarios con la práctica clínica. Permiten regular relaciones entre seguros, prestadores y usuarios. Dependiendo de la arquitectura del mecanismo, estas pueden tornarse beneficiosas o entorpecer el cumplimiento de los objetivos del sistema sanitario.

INTRODUCTION: Healthcare systems are developed in imperfect scenarios, in which there are constant failures (uncertainty, information asymmetry, agency relationship problem, and supply-induced demand). These failures, based on the imperfection of the sector, determine the relationships and incentives between the actors. It is within this context that payment mechanisms regulate aspects of the system behavior and incentives, acting as instruments for the purchasing of health care from providers, mediated by health insurance on behalf of users. OBJECTIVE: To characterize the basic elements of most frequent payment mechanisms to help providers in their relationship with payers. METHODS: A review of the evidence was conducted in PubMed, Google, Google Scholar, and strategic snowball selection. Payment mechanisms consist of three classical microeconomics variables, fixed or variable: price, quantity, and expense. Time dimensions are used to analyze their attributes and effects. Different mechanisms emerge from the combination of these variables. RESULTS: Among the most used are: Fee-For-Service, Global Budget, Bundled Payments, Diagnosis-Related Groups, Per-capita, Performance Pay, and Risk-Sharing Agreements. A fourth has also gained importance: Financial Risk. CONCLUSIONS: Payment mechanisms are essential to link health efforts with clinical practice. They make it possible to regulate relationships between insurers, providers, and users, which, depending on the architecture of the mechanism, can become beneficial or hinder the fulfillment of the objectives of the health system.

[A scoping review of the payment mechanisms in childbirth of country members and non-members of the Organisation for Economic Cooperation and Development]. / Revisión sistemática exploratoria de los mecanismos de pago en la atención del parto en países pertenecientes y no pertenecientes a la Organización para la Cooperación y el Desarrollo Económico.

Introduction: Payment mechanisms serve to put into operation the function of purchasing in health. Payment mechanisms impact the decisions that healthcare providers make. Given this, we are interested in knowing how they affect the generalized increase of C-section rates globally. Objective: The objective of this review is to describe existing payment mechanisms for childbirth in countries members of the Organization for Economic Co-operation and Development (OECD) and non-members. Methods: We conducted a scoping review following the five methodological steps of the Joanna Briggs Institute. The search was conducted by researchers independently, achieving inter-reliability among raters (kappa index, 0.96). We searched electronic databases, grey literature, and governmental and non-governmental websites. We screened on three levels and included documents published in the last ten years, in English and Spanish. Results were analyzed considering the function of the reimbursement mechanism and its effects on providers, payers, and beneficiaries. Results: Evidence from 34 countries was obtained (50% OECD members). Sixty-four percent of countries report the use of more than one payment mechanism for childbirth. Diagnosis-Related Groups (47.6%), Pay-for-performance (23.3%), Fee-for-service (16.6%) and Fixed-prospective systems (13.3%) are among the most frequently used mechanisms. Conclusion: Countries use payment mechanism architecture to improve maternal-perinatal health indicators. Therefore, it is necessary to explore the best combination of mechanisms that improve the provision of health care and welfare of the population in the field of sexual and reproductive health.

Introducción: Los mecanismos de pago corresponden a la operacionalización de la función de compra en salud, incentivando comportamientos en los proveedores de servicios sanitarios. Resulta pertinente preguntarse cómo afectan la vía de resolución del parto, considerando el aumento generalizado en índices de cesárea a nivel global. Objetivo: Describir los mecanismos de pago existentes para la atención del parto en países miembros y no miembros de la Organización para la Cooperación y el Desarrollo Económico. Métodos: Revisión sistemática exploratoria (scoping review). Se adoptaron los cinco pasos metodológicos del Joanna Briggs Institute. La búsqueda se realizó por las investigadoras de forma independiente, logrando la confiabilidad interevaluador (κ 0,96) en bases de datos electrónicas, otras fuentes de información, sitios web gubernamentales y no gubernamentales. Se tamizó en tres niveles, considerando literatura no mayor a 10 años de anti-güedad, idioma inglés y español. Se analizaron los resultados considerando el funcionamiento del mecanismo de pago y sus efectos en prestado-res, seguros y beneficiarias. Resultados: Se obtuvo evidencia de 34 países (50% pertenecientes a la Organización para la Cooperación y el Desarrollo Económico). El 64% con uso de más de un mecanismo de pago para el parto. Entre los mecanismos más utilizados están: grupos relacionados de diagnósticos (47,6%), pago por resultados (23,3%), pago por servicios (16,6%) y pago fijo prospectivo (13,3%). Conclusión: Los países recurren a la arquitectura de los mecanismos de pago para mejorar indicadores en salud materno-perinatales. Es necesario explorar cuál sería la mejor combinación de mecanismos que mejora la provisión de atenciones de salud y bienestar de la población, en el campo de la salud sexual y reproductiva.

Revisión sistemática exploratoria de los mecanismos de pago en la atención del parto en países pertenecientes y no pertenecientes a la Organización para la Cooperación y el Desarrollo Económico / A scoping review of the payment mechanisms in childbirth of country members and non-members of the Organisation for Economic Co-operation and Development

INTRODUCCIÓN Los mecanismos de pago corresponden a la operacionalización de la función de compra en salud, incentivando comportamientos en los proveedores de servicios sanitarios. Resulta pertinente preguntarse cómo afectan la vía de resolución del parto, considerando el aumento generalizado en índices de cesárea a nivel global. OBJETIVO: Describir los mecanismos de pago existentes para la atención del parto en países miembros y no miembros de la Organización para la Cooperación y el Desarrollo Económico. MÉTODOS: Revisión sistemática exploratoria (scoping review). Se adoptaron los cinco pasos metodológicos del Joanna Briggs Institute. La búsqueda se realizó por las investigadoras de forma independiente, logrando la confiabilidad interevaluador (κ 0,96) en bases de datos electrónicas, otras fuentes de información, sitios web gubernamentales y no gubernamentales. Se tamizó en tres niveles, considerando literatura no mayor a 10 años de antigüedad, idioma inglés y español. Se analizaron los resultados considerando el funcionamiento del mecanismo de pago y sus efectos en prestado-res, seguros y beneficiarias. RESULTADOS: Se obtuvo evidencia de 34 países (50% pertenecientes a la Organización para la Cooperación y el Desarrollo Económico). El 64% con uso de más de un mecanismo de pago para el parto. Entre los mecanismos más utilizados están: grupos relacionados de diagnósticos (47,6%), pago por resultados (23,3%), pago por servicios (16,6%) y pago fijo prospectivo (13,3%). CONCLUSIÓN: Los países recurren a la arquitectura de los mecanismos de pago para mejorar indicadores en salud materno-perinatales. Es necesario explorar cuál sería la mejor combinación de mecanismos que mejora la provisión de atenciones de salud y bienestar de la población, en el campo de la salud sexual y reproductiva.

INTRODUCTION: Payment mechanisms serve to put into operation the function of purchasing in health. Payment mechanisms impact the decisions that healthcare providers make. Given this, we are interested in knowing how they affect the generalized increase of C-section rates globally. OBJECTIVE: The objective of this review is to describe existing payment mechanisms for childbirth in countries members of the Organization for Economic Co-operation and Development (OECD) and non-members. METHODS: We conducted a scoping review following the five methodological steps of the Joanna Briggs Institute. The search was conducted by researchers independently, achieving inter-reliability among raters (kappa index, 0.96). We searched electronic databases, grey literature, and governmental and non-governmental websites. We screened on three levels and included documents published in the last ten years, in English and Spanish. RESULTS: were analyzed considering the function of the reimbursement mechanism and its effects on providers, payers, and beneficiaries. Results Evidence from 34 countries was obtained (50% OECD members). Sixty-four percent of countries report the use of more than one payment mechanism for childbirth. Diagnosis-Related Groups (47.6%), Pay-for-performance (23.3%), Fee-for-service (16.6%) and Fixed-prospective systems (13.3%) are among the most frequently used mechanisms. CONCLUSION: Countries use payment mechanism architecture to improve maternal-perinatal health indicators. Therefore, it is necessary to explore the best combination of mechanisms that improve the provision of health care and welfare of the population in the field of sexual and reproductive health.

Antimycobacterial and hypolipemiant activities of Bidens odorata (Cavanilles).

ETHNOPHARMACOLOGICAL RELEVANCE: Bidens odorata Cavanilles is a medicinal and edible plant known as "mozote blanco, aceitilla, acahual, mozoquelite" which is traditionally used in Mexico as a diuretic, hypoglycaemic, anti-inflammatory, antipyretic, antitussive, to treat gastrointestinal disorders, kidney pain, and lung or respiratory diseases. AIM OF THE STUDY: This research study was aimed at phytochemical analysis of aerial extracts of B. odorata for antimycobacterial and lipid-lowering activities. MATERIALS AND METHODS: Compounds 1 (((2R, 3R, 4S, 5S, 6R)-3,4,5-Tryhidroxy-6-(((E)-3-(4-hydroxyphenyl) acryloyl) oxy) tetrahydro-2H-pyran-2-yl) methyl-4-hydroxybenzoate) and 2 (3,5-Dihydroxybenzoic acid) were isolated from B. odorata aerial shoots and their structural elucidation was carried out using 1 and 2D NMR, infrared spectroscopy (IR) and mass spectrometry (ESI-MS). The antimycobacterial activity of various extracts and compounds 1 and 2 was determined using the Microplate Alamar Blue Assay (MABA). The evaluation of the hypolipidemic effect of the ethanolic extract and the glycosylated compound 1 was tested in a murine model of hypercholesterolemia induced by diet and by Triton WR-1339. On the other hand, the LD50 of the ethanolic extract was evaluated in ICR mice by the OECD protocol TG 423. RESULTS: Antimycobacterial assay of hexane, CH2Cl2, EtOAc, ethanolic and aqueous extracts, as well as the new glycosidic compound 1 and benzoic acid derivative 2 isolated from B. odorata showed minimal inhibitory concentrations (MIC) of 100, 12.5, 12.5, 12.5, ≥200, 3.125 and 50 µg/mL, respectively, against Mycobacterium tuberculosis H37Rv. Only hexane and CH2Cl2 extracts were observed to be active against Mycobacterium smegmatis mc2155 at a concentration of 50 and 100 µg/mL, respectively. The ethanolic extract showed lipid-lowering activity at doses of 100 and 1000 mg/kg, while glycosidic compound 1 was active at doses of 50 and 100 mg/kg. In addition, the LD50 of the ethanolic extract was >2000 mg/kg, meaning that this extract does not cause lethality or adverse effects, and no signs of organs alterations or tissue damage were observed. CONCLUSION: The hexane, CH2Cl2, EtOAc, and ethanolic extracts of B. odorata, as well as their components 1 and 2, displayed antimycobacterial activity against M. tuberculosis. Moreover, the ethanolic extract and glycosidic compound 1 showed an important lipid-lowering effect, without lethality or secondary effect. The results of this study support the documented traditional use for B. odorata.

Omitted Stimulus Potential Depends on the Sensory Modality.

Determining the characteristics of Omitted Stimulus Potential (OSP) parameters using different sensory modalities is important because they reflect timing processes and have a substantial influence on time perception. At the same time, the central mechanisms of time perception associated with sensory processing can modulate cortical brain waves related to cognition. This experiment tested the relationship between parameters of the whole OSP brain wave when trains of auditory, visual or somatosensory stimuli were applied. Twenty healthy young college volunteers completed within­subjects trials with sensory stimuli at a fixed frequency of 0.5 Hz that ceased unpredictably. These passive trials required no behavioural response and were administered to measure the complete set of OSP (i.e., the rate of rise, amplitude and peak latency). OSPs showed a faster rate of rise for auditory stimuli compared to visual or somatosensory stimuli. Auditory stimuli also produced a shorter time to peak and higher amplitude waves. No significant differences were obtained between visual and somatosensory waves. The results suggest that the brain handles interval timing and expectation with greater efficiency for the auditory system compared to other sensory modalities. This auditory supremacy is congruent with previous behavioural studies using missing stimulus tasks and could be useful for clinical purposes, for example, designing auditory­based brain­computer interfaces for patients with motor disabilities and visual impairment. The rate of rise is a dynamic measure that should be included in the ERPs analysis.